chemical-physical simulation of polymer based materials http://www.composite-agency.com/ integrated diffusion-chemical-mechanical simulation in order to predict service life, failure, fracture, ageing and fatigue integrated diffusion-chemical-mechanical simulation in order to predict service life, failure, fracture, ageing and fatigue Science & Medicine Natural Sciences en Copyright 2007 contact@composite-agency.com (Composite Agency) contact@composite-agency.com (Composite Agency) 720 07 Sep 2010 10:15:57 GMT 07 Sep 2010 10:15:57 GMT Boten Diffusion - (c) 2002-2010 Composite Agency Dear Mechanical Design,It is not easy to give a general answer to this. Especially in several limiting situations (think for example of the function 1/x limiting to zero), FEM solutions have the tendency to become far from being accurate. So, if the problem can be solved with an exact analytical solution, this is usually better. For a good handbook for mechanically oriented formulae, I would like to recommend Roark's formulas for stress and strain. Only if the dimensions and configurations are too complex for the analytical results (the pain in composite engineering is that these are 99% of Dear Mechanical Design,It is not easy to give a general answer to this. Especially in several limiting situations (think for example of the function 1/x limiting to zero), FEM solutions have the tendency to become far from being accurate. So, if the problem can be solved with an exact analytical solution, this is usually better. For a good handbook for mechanically oriented formulae, I would like to recommend Roark's formulas for stress and strain. Only if the dimensions and configurations are too complex for the analytical results (the pain in composite engineering is that these are 99% of http://www.composite-agency.com/messages/5323.html 07 Sep 2010 10:15:57 GMT Composite Agency http://www.composite-agency.com/messages/5323.html Good afternoon,How I observed on some articles which develop subject of stress-strain curve, appear some FEM results and with FEM results is compare analytical calculus and experimental calculus.My question is how can be construct curve stress-strain for material using material data like :modulus of elasticity, Poisson coef., density of material.Can be combined FEM power with analytical calculus in a manner in which values obtain from FEM is entered in analytical calculus and the results from analytical calculus is entered in FEM, in an iterative manner ?Thank you for understanding and best Good afternoon,How I observed on some articles which develop subject of stress-strain curve, appear some FEM results and with FEM results is compare analytical calculus and experimental calculus.My question is how can be construct curve stress-strain for material using material data like :modulus of elasticity, Poisson coef., density of material.Can be combined FEM power with analytical calculus in a manner in which values obtain from FEM is entered in analytical calculus and the results from analytical calculus is entered in FEM, in an iterative manner ?Thank you for understanding and best http://www.composite-agency.com/messages/5323.html 06 Sep 2010 17:31:39 GMT mechanicaldesign http://www.composite-agency.com/messages/5323.html Well that's al bit of a problem to find out. It is an filter of a competitor. So I'm trying to find it out but it doesn't go fast..On the other hand there are filters in other swimming pools that the PP media doesn't break so it looks like it is a mistery. (concentrations chlorine are not so high so the oxidation might not go fast) I got little resources here to investigate it so i have to find out as much litrature to ask some things at the supplier (and that is in China). So my main questions are:What is the melt flow rate?What is the moleculair weight? What kind of additives are used during Well that's al bit of a problem to find out. It is an filter of a competitor. So I'm trying to find it out but it doesn't go fast..On the other hand there are filters in other swimming pools that the PP media doesn't break so it looks like it is a mistery. (concentrations chlorine are not so high so the oxidation might not go fast) I got little resources here to investigate it so i have to find out as much litrature to ask some things at the supplier (and that is in China). So my main questions are:What is the melt flow rate?What is the moleculair weight? What kind of additives are used during http://www.composite-agency.com/messages/5316.html 02 Sep 2010 08:59:11 GMT Iris Dijkhuizen http://www.composite-agency.com/messages/5316.html Well that's al bit of a problem to find out. It is an filter of a competitor. So I'm trying to find it out but it doesn't go fast..On the other hand there are filters in other swimming pools that the PP media doesn't break so it looks like it is a mistery. (concentrations chlorine are not so high so the oxidation might not go fast) I got little resources here to investigate it so i have to find out as much litrature to ask some things at the supplier (and that is in China). So my main questions are:What is the melt flow rate?What is the moleculair weight? What kind of additives are used during Well that's al bit of a problem to find out. It is an filter of a competitor. So I'm trying to find it out but it doesn't go fast..On the other hand there are filters in other swimming pools that the PP media doesn't break so it looks like it is a mistery. (concentrations chlorine are not so high so the oxidation might not go fast) I got little resources here to investigate it so i have to find out as much litrature to ask some things at the supplier (and that is in China). So my main questions are:What is the melt flow rate?What is the moleculair weight? What kind of additives are used during http://www.composite-agency.com/messages/5316.html 02 Sep 2010 08:25:12 GMT Iris http://www.composite-agency.com/messages/5316.html Thanks Frank Thanks Frank http://www.composite-agency.com/messages/5316.html 01 Sep 2010 18:34:51 GMT Composite Agency http://www.composite-agency.com/messages/5316.html Iris,In line with the comments of Composite Agency, is there any difference in PP property information of the different suppliers? Is the chemical loading (read: concentration of Chlorine gas) in both swimming pool applications equal?Regards,Frank Iris,In line with the comments of Composite Agency, is there any difference in PP property information of the different suppliers? Is the chemical loading (read: concentration of Chlorine gas) in both swimming pool applications equal?Regards,Frank http://www.composite-agency.com/messages/5316.html 01 Sep 2010 18:26:54 GMT Frank http://www.composite-agency.com/messages/5316.html Charles and Composite Agency,You are welcome Charles and Composite Agency,You are welcome http://www.composite-agency.com/messages/5308.html 26 Aug 2010 16:01:37 GMT Sylvia http://www.composite-agency.com/messages/5308.html Dear Iris,You might be right that PP is not resistant to Chlorine gas. Also according to our information PP is not quite resistant to Chlorine gas, either dry or wet, neither Chlorine in the liquid state. This means that a corrosion front might move through the material (with a certain rate, for example, say 0.1 mm/year), which cuts the polymer chains, subsequently resulting in loss of mechanical strength.It is very well possible that Polypropylene with better mechanical properties (check for example the degree of crystallinity and/the average/distribution in molecular weight) will show slower Dear Iris,You might be right that PP is not resistant to Chlorine gas. Also according to our information PP is not quite resistant to Chlorine gas, either dry or wet, neither Chlorine in the liquid state. This means that a corrosion front might move through the material (with a certain rate, for example, say 0.1 mm/year), which cuts the polymer chains, subsequently resulting in loss of mechanical strength.It is very well possible that Polypropylene with better mechanical properties (check for example the degree of crystallinity and/the average/distribution in molecular weight) will show slower http://www.composite-agency.com/messages/5316.html 26 Aug 2010 14:59:44 GMT Composite Agency http://www.composite-agency.com/messages/5316.html Dear sir/madam,I’m trying to start a question at you forum but it won’t allow me. This was my following question.chemical resistance of ppDear all,I hope this is the right forum for my questions. Excuse me for my poor English but I will try.At this moment I am researching a problem with air filters made from polypropylene. I got a filter what is damaged. I think that the filter media broke because of chemical oxidation of chlorine gas (in a swimming pool). I did some research and I think this is a correct explanation because PP is not resistant to strong oxidizing agents. www.andrewwebron Dear sir/madam,I’m trying to start a question at you forum but it won’t allow me. This was my following question.chemical resistance of ppDear all,I hope this is the right forum for my questions. Excuse me for my poor English but I will try.At this moment I am researching a problem with air filters made from polypropylene. I got a filter what is damaged. I think that the filter media broke because of chemical oxidation of chlorine gas (in a swimming pool). I did some research and I think this is a correct explanation because PP is not resistant to strong oxidizing agents. www.andrewwebron http://www.composite-agency.com/messages/5316.html 26 Aug 2010 14:03:19 GMT Iris Dijkhuizen http://www.composite-agency.com/messages/5316.html Composite Agency and Sylvia,Thanks for your help.Charles Composite Agency and Sylvia,Thanks for your help.Charles http://www.composite-agency.com/messages/5308.html 25 Aug 2010 19:56:46 GMT Charles http://www.composite-agency.com/messages/5308.html And some more info on the design pressure And some more info on the design pressure http://www.composite-agency.com/messages/5216.html 25 Aug 2010 18:27:12 GMT Composite Agency http://www.composite-agency.com/messages/5216.html Wajid,Thanks for rejuvenating this subject. What sort of dimensions are your interested (this is important since thin wall cylindrical solutions are quite different from thick wall cylindrical solutions)?Kind Regards,Composite Agency Wajid,Thanks for rejuvenating this subject. What sort of dimensions are your interested (this is important since thin wall cylindrical solutions are quite different from thick wall cylindrical solutions)?Kind Regards,Composite Agency http://www.composite-agency.com/messages/5216.html 25 Aug 2010 18:19:08 GMT Composit Agency http://www.composite-agency.com/messages/5216.html Hi Nick,I have seen various discussion from you on this topic. I am quite beginner in this topic. I appreciate if a detail discussion on how the stresses can be calculated of HDPE liner in CS Pipe which is under designed to inject high pressure water. Objective is to calculate the safe wall thickness of HDPE.Regards Hi Nick,I have seen various discussion from you on this topic. I am quite beginner in this topic. I appreciate if a detail discussion on how the stresses can be calculated of HDPE liner in CS Pipe which is under designed to inject high pressure water. Objective is to calculate the safe wall thickness of HDPE.Regards http://www.composite-agency.com/messages/5216.html 16 Aug 2010 09:57:21 GMT Wajid http://www.composite-agency.com/messages/5216.html Dear All,In 2007 we have done some pilot Electrochemical Impedance Spectroscopic (EIS) measurements and Electrochemical Noise Measurements (ENM) for determining the diffusion coefficient of water in several thin films. The results were indeed not so good, and DVS weight measurements appeared to be necessary. We do not believe that any substantial or fundamental has happened since then, apart from a database that has been developed to cover all the materials (read: variations). Moreover, for some reason, a standard has been developed (NEN-EN-ISO 16773-1:2007 en. Verven en vernissen - Dear All,In 2007 we have done some pilot Electrochemical Impedance Spectroscopic (EIS) measurements and Electrochemical Noise Measurements (ENM) for determining the diffusion coefficient of water in several thin films. The results were indeed not so good, and DVS weight measurements appeared to be necessary. We do not believe that any substantial or fundamental has happened since then, apart from a database that has been developed to cover all the materials (read: variations). Moreover, for some reason, a standard has been developed (NEN-EN-ISO 16773-1:2007 en. Verven en vernissen - http://www.composite-agency.com/messages/5308.html 13 Jul 2010 15:00:27 GMT Composite Agency http://www.composite-agency.com/messages/5308.html Electrical Impedance for Coating residual lifetime is a project in which the wish has been the father to the thought. The data generated by the method is not robust and hardly reproducable. It gives many headaches to derive a single water diffusion coefficient from the method, and the Fickian equilibrium is not attained explicitelyy. Hence, it can not deal with cyclic environmental moisture variations, and the programmed baseline will be dependent on the material (of which the diffusion coefficient could have been measured using the mass uptake method, or the software on this site anyway), it Electrical Impedance for Coating residual lifetime is a project in which the wish has been the father to the thought. The data generated by the method is not robust and hardly reproducable. It gives many headaches to derive a single water diffusion coefficient from the method, and the Fickian equilibrium is not attained explicitelyy. Hence, it can not deal with cyclic environmental moisture variations, and the programmed baseline will be dependent on the material (of which the diffusion coefficient could have been measured using the mass uptake method, or the software on this site anyway), it http://www.composite-agency.com/messages/5308.html 13 Jul 2010 13:47:27 GMT Sylvia http://www.composite-agency.com/messages/5308.html Dear All:Thanks for the CheFEM part on this website. The prediction of fluid-coating interactions is still of major importance in many industrial applications. So, for selection of the proper materials, a software tool like CheFEM is very helpful. But can the software also be used to predict the residual lifetime of an industrial coating applied in real life circumstances (assuming that the processing environment was not ideally)?Reason for asking is that recently I read an article in which they state that Electrical Impedance Spectroscopy (EIS) can be used for measuring the residual lifetime Dear All:Thanks for the CheFEM part on this website. The prediction of fluid-coating interactions is still of major importance in many industrial applications. So, for selection of the proper materials, a software tool like CheFEM is very helpful. But can the software also be used to predict the residual lifetime of an industrial coating applied in real life circumstances (assuming that the processing environment was not ideally)?Reason for asking is that recently I read an article in which they state that Electrical Impedance Spectroscopy (EIS) can be used for measuring the residual lifetime http://www.composite-agency.com/messages/5308.html 12 Jul 2010 16:19:50 GMT Charles Fisher http://www.composite-agency.com/messages/5308.html Dear Sandra,Below some diffusion, solubility, permeability coefficients in some membranes at ambient conditions (25 degrees Celsius ant atmospheiric pressure), no moisture present:General Rubber 1000, 12, 120Butyl rubber 49, 4.4, 2.1 Polyurehtane soft 408, 5.6, 23 Polyurethane hard 88, 7.9, 4.9 Polyvinylchloride soft 420, 10, 42 Polyvinylchloride hard 140, 5.2, 7.3 Polyamide Supronyl 6.1, 3.4, 0.2 Plexi Glas (PMMA) 6.2, 8.2, 0.5 Legend: Material, Diffusivity [1E-10 cm2/s], Solubility[-], Permeability[1E-8 cm2/s].The Radon diffusion through Epoxy resin is very dependent on the type of Epoxy ( Dear Sandra,Below some diffusion, solubility, permeability coefficients in some membranes at ambient conditions (25 degrees Celsius ant atmospheiric pressure), no moisture present:General Rubber 1000, 12, 120Butyl rubber 49, 4.4, 2.1 Polyurehtane soft 408, 5.6, 23 Polyurethane hard 88, 7.9, 4.9 Polyvinylchloride soft 420, 10, 42 Polyvinylchloride hard 140, 5.2, 7.3 Polyamide Supronyl 6.1, 3.4, 0.2 Plexi Glas (PMMA) 6.2, 8.2, 0.5 Legend: Material, Diffusivity [1E-10 cm2/s], Solubility[-], Permeability[1E-8 cm2/s].The Radon diffusion through Epoxy resin is very dependent on the type of Epoxy ( http://www.composite-agency.com/messages/5306.html 07 Jul 2010 16:59:50 GMT Composite Agency http://www.composite-agency.com/messages/5306.html Hi,Does someone know the permeation rate of Radon through cast and glass reinforced resins (e.g. polyester, ve resin, epoxy resin) and thermoplastic materials (polyamide, polyvinylchloride, polypropylene) in the presence of Water (relative humidity 80-100%). What is the solubility (parameter) of Radon, Xenon and Krypton in these plastics?Best Regards,Sandra Hi,Does someone know the permeation rate of Radon through cast and glass reinforced resins (e.g. polyester, ve resin, epoxy resin) and thermoplastic materials (polyamide, polyvinylchloride, polypropylene) in the presence of Water (relative humidity 80-100%). What is the solubility (parameter) of Radon, Xenon and Krypton in these plastics?Best Regards,Sandra http://www.composite-agency.com/messages/5306.html 09 Jun 2010 12:21:39 GMT Sandra http://www.composite-agency.com/messages/5306.html Multiphysics simulation is one of the fastest growing research field in industrial engineering. This conference will concentrate on some aspects of this emerging research field. The contributed papers will show new engineering processes and demonstrate their practicability in real engineering cases. Enhenced numerical algorithms, new software solutions, advanced modelling procedures, and engineering guidelines will be presented by more 70 authors from research and industry.Organized by Fraunhofer Allianz Multiphysics simulation is one of the fastest growing research field in industrial engineering. This conference will concentrate on some aspects of this emerging research field. The contributed papers will show new engineering processes and demonstrate their practicability in real engineering cases. Enhenced numerical algorithms, new software solutions, advanced modelling procedures, and engineering guidelines will be presented by more 70 authors from research and industry.Organized by Fraunhofer Allianz http://www.composite-agency.com/news.htm#5306 28 May 2010 10:42:26 GMT Composite Agency http://www.composite-agency.com/news.htm#5306 John,Thanks for your kind feedback.According to the most reputable models on ageing, physical ageing (including creep and free volume contraction of polymers, for example epoxy, below the glass transition) does not influence the interfacial toughness (expressed in Joule per square meter) if determined in the correct manner. This has been extracted from very rigorous experiments and modelling on fibre pull-out. However, chemical ageing resulting in matrix plasticizing, chemical degradation of an interfacial adhesive/sizings and matrix material expansion by mass uptake and thermal, certainly John,Thanks for your kind feedback.According to the most reputable models on ageing, physical ageing (including creep and free volume contraction of polymers, for example epoxy, below the glass transition) does not influence the interfacial toughness (expressed in Joule per square meter) if determined in the correct manner. This has been extracted from very rigorous experiments and modelling on fibre pull-out. However, chemical ageing resulting in matrix plasticizing, chemical degradation of an interfacial adhesive/sizings and matrix material expansion by mass uptake and thermal, certainly http://www.composite-agency.com/messages/5303.html 17 May 2010 16:07:54 GMT Composite Agency http://www.composite-agency.com/messages/5303.html Just found some additional info on Graphene based Epoxy composites, the outcome are not bad and this is an understatement. Here it goes:Graphene equal to 0.1 percent of the weight of the composite boosted the strength and the stiffness of the material to the same degree as adding carbon nanotubes equal to 1 percent of the weight of the composite. This gain, on the measure of one order of magnitude, highlights the promise of graphene, Koratkar said. The graphene fillers also boosted the composite’s resistance to fatigue crack propagation by nearly two orders of magnitude, compared to the Just found some additional info on Graphene based Epoxy composites, the outcome are not bad and this is an understatement. Here it goes:Graphene equal to 0.1 percent of the weight of the composite boosted the strength and the stiffness of the material to the same degree as adding carbon nanotubes equal to 1 percent of the weight of the composite. This gain, on the measure of one order of magnitude, highlights the promise of graphene, Koratkar said. The graphene fillers also boosted the composite’s resistance to fatigue crack propagation by nearly two orders of magnitude, compared to the http://www.composite-agency.com/messages/5303.html 12 May 2010 12:27:20 GMT John Cllarck http://www.composite-agency.com/messages/5303.html Thanks for the nice website, and CheFEM. I like the inclusion of rigorious FEM chemical thermodynamics in the study and simulation of composite materials! My question is on physical and chemical ageing. As we all know ageing relaxes internal stresses, no matter generated by mechanical loading, residual thermal stresses or a diffusing permeant. But, will this ageing influence the interfacial toughness of for example, an epoxy composite reinforced with Graphene? Let us suppose that the interface is not weakened by chemical reaction and/or plastification.I suppose this is included in CheFEM Thanks for the nice website, and CheFEM. I like the inclusion of rigorious FEM chemical thermodynamics in the study and simulation of composite materials! My question is on physical and chemical ageing. As we all know ageing relaxes internal stresses, no matter generated by mechanical loading, residual thermal stresses or a diffusing permeant. But, will this ageing influence the interfacial toughness of for example, an epoxy composite reinforced with Graphene? Let us suppose that the interface is not weakened by chemical reaction and/or plastification.I suppose this is included in CheFEM http://www.composite-agency.com/messages/5303.html 12 May 2010 11:07:37 GMT John Clarck http://www.composite-agency.com/messages/5303.html Graphene is one of the most promising nano material in modern material science. One atomic layer of Graphene is completely diffusion and permeation tight. Moreover, the tensile strength of Graphene is 20 times stronger than steel. And Graphene has some other very interesting chemical-physical features.Since application of Graphene in packaging materials, coating and composites, etc. is nearby, simulation and analysis of Graphene based materials in real-life circumstances becomes more and more important. In this perspective, we are happy to inform you that -as expected - a recent published Graphene is one of the most promising nano material in modern material science. One atomic layer of Graphene is completely diffusion and permeation tight. Moreover, the tensile strength of Graphene is 20 times stronger than steel. And Graphene has some other very interesting chemical-physical features.Since application of Graphene in packaging materials, coating and composites, etc. is nearby, simulation and analysis of Graphene based materials in real-life circumstances becomes more and more important. In this perspective, we are happy to inform you that -as expected - a recent published http://www.composite-agency.com/news.htm#5303 11 May 2010 13:56:00 GMT Composite Agency http://www.composite-agency.com/news.htm#5303 Leading Companies Reduce Product Cost by 6% While Competitors See Cost IncreasesBOSTON, MA--(Marketwire - May 5, 2010) - Aberdeen Group, a Harte-Hanks Company (NYSE: HHS) today released a new research study titled Cost Saving Strategies for Engineering: Using Simulation to Make Better Decisions. The study uncovers the most successful ways companies are taking cost out of their product designs and the role simulation plays in this. The most profitable companies are 70% more likely than competitors to implement a 'get it right the first time' strategy, as well as analyze product behavior Leading Companies Reduce Product Cost by 6% While Competitors See Cost IncreasesBOSTON, MA--(Marketwire - May 5, 2010) - Aberdeen Group, a Harte-Hanks Company (NYSE: HHS) today released a new research study titled Cost Saving Strategies for Engineering: Using Simulation to Make Better Decisions. The study uncovers the most successful ways companies are taking cost out of their product designs and the role simulation plays in this. The most profitable companies are 70% more likely than competitors to implement a 'get it right the first time' strategy, as well as analyze product behavior http://www.composite-agency.com/news.htm#5303 07 May 2010 12:49:55 GMT Composite Agency http://www.composite-agency.com/news.htm#5303 Hi,Polylactide (PLA) is a biodegradable, thermoplastic, aliphatic polyester derived from renewable resources, such as corn starch (in the U.S.) or sugarcanes (rest of world). I am interested in the short and long term water permeation (water vapour transmission rates) properties in humid conditions in the temperature range from 0 to 40 degrees Celsius. Furthermore, I assume that the material chemically ages in humid circumstances, hence insight in the kinetics and duration of this Polylactide ageing is also of my interest.Last but not least: can we make laminates of Polylactide polymer with Hi,Polylactide (PLA) is a biodegradable, thermoplastic, aliphatic polyester derived from renewable resources, such as corn starch (in the U.S.) or sugarcanes (rest of world). I am interested in the short and long term water permeation (water vapour transmission rates) properties in humid conditions in the temperature range from 0 to 40 degrees Celsius. Furthermore, I assume that the material chemically ages in humid circumstances, hence insight in the kinetics and duration of this Polylactide ageing is also of my interest.Last but not least: can we make laminates of Polylactide polymer with http://www.composite-agency.com/messages/5302.html 27 Apr 2010 11:27:17 GMT Anna Smith http://www.composite-agency.com/messages/5302.html Dear Jiahuan Jiang,The observed diffusion mechanism is due to a dual sorption mode of CO2 (and also often H2O) with regard to several materials (among which are PDMS and more rigid materials like Polyimide). One part is relative mobile, another part temporarly binds to the polymer chain at adsorption site. The fact that the kinetics of binding are much slower than the kinetic of diffusion, results in the visibility of the phenomenon in the time scale of interest. Please let us know if you need a more rigorous quantification of the phenomenon in laboratory or real-life circumstances.Kind Dear Jiahuan Jiang,The observed diffusion mechanism is due to a dual sorption mode of CO2 (and also often H2O) with regard to several materials (among which are PDMS and more rigid materials like Polyimide). One part is relative mobile, another part temporarly binds to the polymer chain at adsorption site. The fact that the kinetics of binding are much slower than the kinetic of diffusion, results in the visibility of the phenomenon in the time scale of interest. Please let us know if you need a more rigorous quantification of the phenomenon in laboratory or real-life circumstances.Kind http://www.composite-agency.com/messages/3679.html 26 Apr 2010 15:02:14 GMT Composite Agency http://www.composite-agency.com/messages/3679.html I am interested in this topic, could you tell me how do you happen to think this problem I am interested in this topic, could you tell me how do you happen to think this problem http://www.composite-agency.com/messages/3679.html 24 Apr 2010 00:34:56 GMT Jiahuan Jiang http://www.composite-agency.com/messages/3679.html The Offshore Technology Conference in Houston will be held from 3 to 6 May 2010.The Offshore Technology Conference (OTC) is the world’s foremost event for the development of offshore resources in the fields of drilling, exploration, production, and environmental protection.The technical presentation program includes the following subjects (among others): Flexible Pipe Integrity Monitoring: A New System To Assess the Flexible Pipe Annulus Condition; Real-Time Continuous Structural Integrity Monitoring of Flexible Risers With Optical Fiber Sensors; Flexible Pipe Curved Collapse Behavior The Offshore Technology Conference in Houston will be held from 3 to 6 May 2010.The Offshore Technology Conference (OTC) is the world’s foremost event for the development of offshore resources in the fields of drilling, exploration, production, and environmental protection.The technical presentation program includes the following subjects (among others): Flexible Pipe Integrity Monitoring: A New System To Assess the Flexible Pipe Annulus Condition; Real-Time Continuous Structural Integrity Monitoring of Flexible Risers With Optical Fiber Sensors; Flexible Pipe Curved Collapse Behavior http://www.composite-agency.com/news.htm#5300 23 Apr 2010 11:56:09 GMT Composite Agency http://www.composite-agency.com/news.htm#5300 Could you clarify a little more on the second media: where do you get 70% sulphuric acid at 120 degrees Celsius? The temperature in combination with the high concentration is unusual for FRP materials.For the first media an option is the Derakane Vinyl Ester Epoxy Resins.Composite Agency Could you clarify a little more on the second media: where do you get 70% sulphuric acid at 120 degrees Celsius? The temperature in combination with the high concentration is unusual for FRP materials.For the first media an option is the Derakane Vinyl Ester Epoxy Resins.Composite Agency http://www.composite-agency.com/messages/5296.html 21 Apr 2010 15:13:57 GMT Composite Agency http://www.composite-agency.com/messages/5296.html Dear Sir,Life time- 10 yearzyes yesvolume of tank = 95 cubic metre Dear Sir,Life time- 10 yearzyes yesvolume of tank = 95 cubic metre http://www.composite-agency.com/messages/5296.html 21 Apr 2010 14:58:13 GMT Syed Arsalan Afsar http://www.composite-agency.com/messages/5296.html Dear Syed Arsalan Afsar,Thanks for your thread.- What is the required lifetime for the composite (10, 20, 50, 100 years)?- Are there any regulations or resistriction for acid emissions from the tank (by long term permeation through the tank wall)?- I suppose you are looking for a matrix with glass reinforcements?- Is there a global indication of the dimensions of the tank?Looking forward to hearing from you.Kind Regards,Composite Agency Dear Syed Arsalan Afsar,Thanks for your thread.- What is the required lifetime for the composite (10, 20, 50, 100 years)?- Are there any regulations or resistriction for acid emissions from the tank (by long term permeation through the tank wall)?- I suppose you are looking for a matrix with glass reinforcements?- Is there a global indication of the dimensions of the tank?Looking forward to hearing from you.Kind Regards,Composite Agency http://www.composite-agency.com/messages/5296.html 19 Apr 2010 14:20:32 GMT Composite Agency http://www.composite-agency.com/messages/5296.html Dear sir,what is the best resin for FRP tank containing following media 1-nitric acid (50%-60%) at ambient temperature. 2-sulphuric acid 70% at 120 degree Centigrate.your early response will be highly appreciated .RegardsSyed Arsalan Afsars_arsi@hotmail.com Dear sir,what is the best resin for FRP tank containing following media 1-nitric acid (50%-60%) at ambient temperature. 2-sulphuric acid 70% at 120 degree Centigrate.your early response will be highly appreciated .RegardsSyed Arsalan Afsars_arsi@hotmail.com http://www.composite-agency.com/messages/5296.html 19 Apr 2010 09:58:24 GMT Syed Arsalan Afsar http://www.composite-agency.com/messages/5296.html OK, this helps. CheFEM is on top of the chemical resistance guides, a sort of expert system for chemical resistance inquiries. Furthermore it gives more insight in effects of filler particles and reinforcements in composites, seal, etc. applied in basic or more complex shapes. Sounds great!Cheers,Donald OK, this helps. CheFEM is on top of the chemical resistance guides, a sort of expert system for chemical resistance inquiries. Furthermore it gives more insight in effects of filler particles and reinforcements in composites, seal, etc. applied in basic or more complex shapes. Sounds great!Cheers,Donald http://www.composite-agency.com/messages/5292.html 19 Apr 2010 08:24:40 GMT Donal Green http://www.composite-agency.com/messages/5292.html OK, this helps. CheFEM is on top of the chemical resistance guides, a sort of expert system for chemical resistance inquiries. Furthermore it gives more insight in effects of filler particles and reinforcements in composites, seal, etc. applied in basic or more complex shapes. Sounds great!Cheers,Donald OK, this helps. CheFEM is on top of the chemical resistance guides, a sort of expert system for chemical resistance inquiries. Furthermore it gives more insight in effects of filler particles and reinforcements in composites, seal, etc. applied in basic or more complex shapes. Sounds great!Cheers,Donald http://www.composite-agency.com/messages/5292.html 19 Apr 2010 08:23:08 GMT Donald Green http://www.composite-agency.com/messages/5292.html Dear Donald,Thanks for this thread. In following occasions chemical resistance guides of the well-established (raw) material supplier can be used without problems:* for the described chemical or exact mixture (e.g. 5% HCL concentration) * in a basic shape (plane sheet, box, cylinder) * at the exact described temperature and pressure* for the short term (say 1 to 5 years).In the following circumstances CheFEM is advised in addition to the chemical resistance guide:* mixtures that are not described in the chemical corrosion guide;* more complex shapes / complex laminate build-ups;* Dear Donald,Thanks for this thread. In following occasions chemical resistance guides of the well-established (raw) material supplier can be used without problems:* for the described chemical or exact mixture (e.g. 5% HCL concentration) * in a basic shape (plane sheet, box, cylinder) * at the exact described temperature and pressure* for the short term (say 1 to 5 years).In the following circumstances CheFEM is advised in addition to the chemical resistance guide:* mixtures that are not described in the chemical corrosion guide;* more complex shapes / complex laminate build-ups;* http://www.composite-agency.com/messages/5292.html 15 Apr 2010 21:59:24 GMT Composite Agency http://www.composite-agency.com/messages/5292.html Dear All:I read somewhere in the section on CheFEM software that the software replaces the traditional chemical resistance guides or at least adds more value than traditional corrosion guides (a table with ranking of chemicals as function of concentration, temperature and sometimes pressure). Especially for composites, laminates and biological based materials. I understand the novel integrated diffusion, chemical, mechanical approach, but have problems to transpose this to a handy chemical resistance guide. Could this be explained more thoroughly?Thanks,Donald Dear All:I read somewhere in the section on CheFEM software that the software replaces the traditional chemical resistance guides or at least adds more value than traditional corrosion guides (a table with ranking of chemicals as function of concentration, temperature and sometimes pressure). Especially for composites, laminates and biological based materials. I understand the novel integrated diffusion, chemical, mechanical approach, but have problems to transpose this to a handy chemical resistance guide. Could this be explained more thoroughly?Thanks,Donald http://www.composite-agency.com/messages/5292.html 07 Apr 2010 22:03:19 GMT Donald Green http://www.composite-agency.com/messages/5292.html I'm currently working on a group project to change the properties of biodegradable plastic to make it have a higher self life and was looking at adding nylon because it can degrade with the correct enzyme additives. I was wondering if you have any information on your project and if you would be willing to share it. Thank you I'm currently working on a group project to change the properties of biodegradable plastic to make it have a higher self life and was looking at adding nylon because it can degrade with the correct enzyme additives. I was wondering if you have any information on your project and if you would be willing to share it. Thank you http://www.composite-agency.com/messages/4713.html 07 Apr 2010 05:47:14 GMT Amberose http://www.composite-agency.com/messages/4713.html Good question, my quess is still no. Here some stuff from 2005, very probably not much has changed since then, Professor James Williams of the Massachusetts Institute of Technology, a composites expert, suggests that repeated journeys (of aerospace composites) to and from the sub-zero temperatures found at cruising altitude causes a build-up of condensation inside composites, and separation of the carbon fibre layers as this moisture freezes and thaws. According to Williams, like a pothole in a roadway in winter, over time these gaps may grow . Read more in this article: Good question, my quess is still no. Here some stuff from 2005, very probably not much has changed since then, Professor James Williams of the Massachusetts Institute of Technology, a composites expert, suggests that repeated journeys (of aerospace composites) to and from the sub-zero temperatures found at cruising altitude causes a build-up of condensation inside composites, and separation of the carbon fibre layers as this moisture freezes and thaws. According to Williams, like a pothole in a roadway in winter, over time these gaps may grow . Read more in this article: http://www.composite-agency.com/messages/5289.html 24 Mar 2010 10:08:48 GMT Karin Walker http://www.composite-agency.com/messages/5289.html 50 years of contract research, water absorption profiles in GRP with glass veils, CSM, woven roving, glass fibre sizings hocus spocus, temperature gradients, stress and strains pictures of cylindrical laminates, and for a few years FEM simulations further, the one million dollar question with GRP and (I suppose Bio composite materials) still is:Is blister formation in fibre reinforced materials yet understood? Marcel 50 years of contract research, water absorption profiles in GRP with glass veils, CSM, woven roving, glass fibre sizings hocus spocus, temperature gradients, stress and strains pictures of cylindrical laminates, and for a few years FEM simulations further, the one million dollar question with GRP and (I suppose Bio composite materials) still is:Is blister formation in fibre reinforced materials yet understood? Marcel http://www.composite-agency.com/messages/5289.html 19 Mar 2010 15:13:25 GMT Marcel Dekker http://www.composite-agency.com/messages/5289.html Hi Brooke,Natural fibres, like flax and hemp, have a relative high strength and stiffness to weight ratio, relative high toughness, good thermal properties and are biodegradable. However there are some challenges in the practical use, which is an intrinsic poor compatibility between the fibre and several matrices, including pe, pp, vinyl ester, epoxy and polyurethane resin materials and inherent high moisture uptake and subsequent swelling of the flax (or hemp which is also used).At 23 degrees Celsius, the 100% moisture absorption of most low or medium hydrophobic polymers - including pe, peek Hi Brooke,Natural fibres, like flax and hemp, have a relative high strength and stiffness to weight ratio, relative high toughness, good thermal properties and are biodegradable. However there are some challenges in the practical use, which is an intrinsic poor compatibility between the fibre and several matrices, including pe, pp, vinyl ester, epoxy and polyurethane resin materials and inherent high moisture uptake and subsequent swelling of the flax (or hemp which is also used).At 23 degrees Celsius, the 100% moisture absorption of most low or medium hydrophobic polymers - including pe, peek http://www.composite-agency.com/messages/5287.html 18 Mar 2010 17:35:35 GMT Composite Agency http://www.composite-agency.com/messages/5287.html To All: Nowadays bio-derived composite resins - like polylactide and furan based resins - combined with natural flax (obtained from bast) fibres - rather than petrochemical-based products - is a hot topic. It is stated that material properties are rather promising, not only because of environmental friendly disposal, but also because of intrinsic flax performance. For example: it is told that natural flax fibres have a comparable strength and equal fire-resistance properties and that they are 10-30% lighter than glass fibres (no doubt about that). Assuming that limitations in processing To All: Nowadays bio-derived composite resins - like polylactide and furan based resins - combined with natural flax (obtained from bast) fibres - rather than petrochemical-based products - is a hot topic. It is stated that material properties are rather promising, not only because of environmental friendly disposal, but also because of intrinsic flax performance. For example: it is told that natural flax fibres have a comparable strength and equal fire-resistance properties and that they are 10-30% lighter than glass fibres (no doubt about that). Assuming that limitations in processing http://www.composite-agency.com/messages/5287.html 18 Mar 2010 14:51:30 GMT Brooke Jenkins http://www.composite-agency.com/messages/5287.html New generation epoxy systems that combine unprecedented durability and easy processing improve the reliability and longevity of energy generation and distribution equipment including wind blades, high-voltage insulators and composite-reinforced conductor cables: To withstand extreme conditions, new methods for toughening the epoxy adhesive used in assembling blades are yielding impressive improvements in bonding quality to reduce skin/adhesive delamination and adhesive joint failure. Specifically, by utilizing nanoparticles during polymerization, Huntsman chemists are dramatically increasing New generation epoxy systems that combine unprecedented durability and easy processing improve the reliability and longevity of energy generation and distribution equipment including wind blades, high-voltage insulators and composite-reinforced conductor cables: To withstand extreme conditions, new methods for toughening the epoxy adhesive used in assembling blades are yielding impressive improvements in bonding quality to reduce skin/adhesive delamination and adhesive joint failure. Specifically, by utilizing nanoparticles during polymerization, Huntsman chemists are dramatically increasing http://www.composite-agency.com/news.htm#5286 03 Mar 2010 17:30:05 GMT Composite Agency http://www.composite-agency.com/news.htm#5286 You might decide on your budget and then pick one of these in descending order of preference:1. Catia / Abaqus package2. Abaqus Computer Aided Engineering3. Patran / Nastran4. Femap / Nastran5. Ansys Workbencj6. Nisa, Algor, Cosmos, etc.Rgearding Chefem:CHEFEM adds - like it says - CHEmical interactions to FEM based engineering analysis. Specifically when dealing with chemicals and/or high temperature and pressure conditions Chefem is very useful. Why? One of the most important reasons is that the multiphysics packages listed above are not good in the solubility / diffusion / interfacial You might decide on your budget and then pick one of these in descending order of preference:1. Catia / Abaqus package2. Abaqus Computer Aided Engineering3. Patran / Nastran4. Femap / Nastran5. Ansys Workbencj6. Nisa, Algor, Cosmos, etc.Rgearding Chefem:CHEFEM adds - like it says - CHEmical interactions to FEM based engineering analysis. Specifically when dealing with chemicals and/or high temperature and pressure conditions Chefem is very useful. Why? One of the most important reasons is that the multiphysics packages listed above are not good in the solubility / diffusion / interfacial http://www.composite-agency.com/dupdir/5280.html 26 Feb 2010 17:09:22 GMT Kate Stuart http://www.composite-agency.com/messages/5279.html Hello,I am a mechanical engineer in charge to assess a new equipment made from plastic based materials. Now, in order to select the appropriate materials and analyze the expected service life of the structure, we are orienting ourselves on existing FEM software, like Abaqus / Catia, Ansys, Nastran or SolidWorks Premium. According to the brochures, these programs not only utilize static, but also dynamic loads on composite structures, such as impact, torsional, flexural loads, and subsequent damage and failure analyis.Now, my questions are:- What FEM simulation program should I use?- Is the CLS Hello,I am a mechanical engineer in charge to assess a new equipment made from plastic based materials. Now, in order to select the appropriate materials and analyze the expected service life of the structure, we are orienting ourselves on existing FEM software, like Abaqus / Catia, Ansys, Nastran or SolidWorks Premium. According to the brochures, these programs not only utilize static, but also dynamic loads on composite structures, such as impact, torsional, flexural loads, and subsequent damage and failure analyis.Now, my questions are:- What FEM simulation program should I use?- Is the CLS http://www.composite-agency.com/messages/5279.html 18 Feb 2010 17:02:45 GMT Pete Young http://www.composite-agency.com/messages/5279.html The course will provide the participants with a knowledge of fundamental principles of statistical mechanicsand thermodynamics, of how to link microscopic phenomena with macroscopic properties and of how to model complex chemical systems.The course is of relevance to researchers involved in molecular modeling, molecular thermodynamics, polymer physics and physical chemistry of fluids. People involved in process and / or advanced material design will benefit from it.Source: Technical University of DenmarkOrganizer: Technical University of DenmarkPlace / Date: Denmark, Lyngby, 28 June – 9 July The course will provide the participants with a knowledge of fundamental principles of statistical mechanicsand thermodynamics, of how to link microscopic phenomena with macroscopic properties and of how to model complex chemical systems.The course is of relevance to researchers involved in molecular modeling, molecular thermodynamics, polymer physics and physical chemistry of fluids. People involved in process and / or advanced material design will benefit from it.Source: Technical University of DenmarkOrganizer: Technical University of DenmarkPlace / Date: Denmark, Lyngby, 28 June – 9 July http://www.composite-agency.com/news.htm#5279 12 Feb 2010 11:56:40 GMT Composite Agency http://www.composite-agency.com/news.htm#5279 Vikas Mittal from the BASF Polymer Research Laboratories has edited a one-stop resource for researchers and developers alike covering a plethora of nanocomposite properties and their enhancement mechanisms. With contributors from industry as well as academia, each chapter elucidates in detail the mechanisms to achieve a certain functionality of the polymer nanocomposite, such as improved biodegradability, increased chemical resistance and tribological performance. Special emphasis is laid on the interdependence of the factors that affect the nanocomposite properties such that readers obtain Vikas Mittal from the BASF Polymer Research Laboratories has edited a one-stop resource for researchers and developers alike covering a plethora of nanocomposite properties and their enhancement mechanisms. With contributors from industry as well as academia, each chapter elucidates in detail the mechanisms to achieve a certain functionality of the polymer nanocomposite, such as improved biodegradability, increased chemical resistance and tribological performance. Special emphasis is laid on the interdependence of the factors that affect the nanocomposite properties such that readers obtain http://www.composite-agency.com/news.htm#5277 09 Feb 2010 09:55:03 GMT Composite Agency http://www.composite-agency.com/news.htm#5277 Nima,Thanks for your posting. Could you explain you question a little more in detail. Are you interested in FEM related modelling of bio composite materials, specifically the long term physical - chemical behaviour of Truss Elements? What sort of FEM simulation program are you using, e.g. Abaqus, SolidWorks Professional, Ansys, MSC Marc Nima,Thanks for your posting. Could you explain you question a little more in detail. Are you interested in FEM related modelling of bio composite materials, specifically the long term physical - chemical behaviour of Truss Elements? What sort of FEM simulation program are you using, e.g. Abaqus, SolidWorks Professional, Ansys, MSC Marc http://www.composite-agency.com/dupdir/5276.html 08 Feb 2010 21:09:48 GMT Composite Agency http://www.composite-agency.com/messages/5275.html Hi,If it possible for you can you help me about Performance of Biocomposite materials As The Truss Element, tnx...Nima Hi,If it possible for you can you help me about Performance of Biocomposite materials As The Truss Element, tnx...Nima http://www.composite-agency.com/messages/5275.html 08 Feb 2010 21:06:40 GMT Nima http://www.composite-agency.com/messages/5275.html Vikas Mittal from the BASF Polymer Research Laboratories has edited a one-stop resource for researchers and developers alike covering a plethora of nanocomposite properties and their enhancement mechanisms. With contributors from industry as well as academia, each chapter elucidates in detail the mechanisms to achieve a certain functionality of the polymer nanocomposite, such as improved biodegradability, increased chemical resistance and tribological performance. Special emphasis is laid on the interdependence of the factors that affect the nanocomposite properties such that readers obtain Vikas Mittal from the BASF Polymer Research Laboratories has edited a one-stop resource for researchers and developers alike covering a plethora of nanocomposite properties and their enhancement mechanisms. With contributors from industry as well as academia, each chapter elucidates in detail the mechanisms to achieve a certain functionality of the polymer nanocomposite, such as improved biodegradability, increased chemical resistance and tribological performance. Special emphasis is laid on the interdependence of the factors that affect the nanocomposite properties such that readers obtain http://www.composite-agency.com/news.htm#5275 05 Feb 2010 13:28:41 GMT Composite Agency http://www.composite-agency.com/news.htm#5275 Today Composite Agency releases the following press release in the framework of JEC 2010 (13 Apr 2010 / 15 Apr 2010 - Paris France):We have brought chemical interactions into FEM based composite analysis!No doubt that current FEM based multiphysics programs are state-of-the-art. The colourful Von Mises, displacement graphs, etc. are very useful and - also very important - look great!But there is one drawback. Usually they ignore effects of chemical/uv interactions with the composite matrix and reinforcements. Species solubility thermodynamics, subsequent diffusion, swelling, plasticizing, Today Composite Agency releases the following press release in the framework of JEC 2010 (13 Apr 2010 / 15 Apr 2010 - Paris France):We have brought chemical interactions into FEM based composite analysis!No doubt that current FEM based multiphysics programs are state-of-the-art. The colourful Von Mises, displacement graphs, etc. are very useful and - also very important - look great!But there is one drawback. Usually they ignore effects of chemical/uv interactions with the composite matrix and reinforcements. Species solubility thermodynamics, subsequent diffusion, swelling, plasticizing, http://www.composite-agency.com/news.htm#5275 02 Feb 2010 10:56:11 GMT Composite Agency http://www.composite-agency.com/news.htm#5275