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stress-strain curve using fem software

Thread by mechanicaldesign on 06 Sep 2010 at 17:31:39 
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 regards.

P.S. I´m ANSYS user.

    Comment by Composite Agency on 07 Sep 2010 at 10:15:57  | |responses: 0|
    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 the cases), I would recommend FEM solutions. For diffusion and thermal oriented problems, I would recommend using CheFEM since - among others - the sort of mathematical drawbacks described in the first alinea - have been solved with this regard.

    Kind Regards,
    Composite Agency
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