From Theory of Plasticity point of view, a material that undergoes plastic deformation must be modeled using the True Stress-strain curve. However, this is the general approach when the stress-strain curve is used is obtained from tensile testing (For example while modeling Aluminum using Bilinear Material models). So it is logical to convert engineering to true stress-strain to accurately model the material.
However, if modeling honeycombs/foams and using stress-strain data from the compressive testing, then is there a need for conversion to true stress-strain?
becouse masalh buliding at civil enginneer component tar isolate and aluminium also model basic teory mathmatics
For get of the better results in equivalent modeling, that is better convert of compressive engineering stress strain to true stress strain.
Yes certainly, true stress-strain curve would definitely help you to get reliable or realistic results when you compare with those of the experimental data. Also for Aluminium Foam, you can choose MAT63 or MAT163 for better results. For Explicit analysis, use quasi to high strain rate stress-strain curves. "Contacts" always matters.
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