Buckling Modes of Multilayer Pipelines in CheFEM?  

Thread by Donald Green on 12 Oct 2009 at 17:21:08 
Hi Platform,

I have been skimming through literature and internet for a rigorous but self-explanatory solution of the buckling modes of a multilayer pipeline, consisting of different materials (say metal and - reinforced polymer), glued to each other with adhesive or with an annular space. The pipeline is exposed to (1) internal pressure, (2) temperature gradient and (3) a mass swelling gradient (as a result of diffusion through polymers).
Solutions should include as well as thin wall pipe (in which membrane theory should apply) as thick walled multi layer cylinder pipeline.

I want to apply the suggested solution for prediction of buckling behaviour of laminated epoxy pipes at high pressure (which consists of different plies), polymer metal tubes or the behavior of internal or external pipeline isolution (think of hot water or LNG transport)

I need self explanatory and applicable solutions (I am not interested in 5 pages of matrices for the calculation of one interfacial stress component - neglecting the influence of stress build-up by temperature and mass swelling ;-[ ). Is this something which can be generated by CheFEM simulation tool?

Best Regards,
Donald Green

    Comment by Composite Agency on 13 Oct 2009 at 18:10:40  | |responses: 1|
    Dear Donald Green,

    Yes, buckling modes of multilayer structures (e.g. Polyethylene to Aluminum, Reinforced Epoxy plies, PU isolation on X65 high-strength steel, etc.) are included in CheFEM.

    In case of internal pressure, temperature variations and swelling strains, I assume that at this point you are - above all - interested in circumferential buckling phenomena. The determination and prediction of this buckling behaviour in multilayer is an important core capability of CheFEM because this failure mode could esult from the combined action of internal pressure, temperature and mass swelling strains. Click CheFEM Simulation to learn more.

    Composite Agency

      Comment by Donald Green on 13 Oct 2009 at 19:19:28  | |responses: 0|
      Composite Agency:

      Thank you very much for your prompt reply.

      See attached paper on CFRP pipeline faiure behaviour at 150 bar for additional information to my posting (pdf publication):


      Their findings are in line with Composite Agency's statements on the CheFEM capability, but the publication lacks the rigorous quantification. I would really appreciate your assistance in this matter,

      Donald Green