Thank you!

There is no substitute for actual material testing. That being said, if you are using some well-studied “typical” materials there is probably some literature out there to start you in the right direction. When in doubt, start simple and then add complexity. Try the model just assuming elasticity - you just need a modulus and Poisson’s ratio - and see how it behaves. Then add some yielding (isotopic bilinear hardening is probably the simplest - you need a yield stress or strain and a new modulus after yielding) and see how it behaves. You may find that these alone will give you some useful insight, or you may find that adding still more complexity is required.

As long as you have stress-strain data for your material (from the lab or perhaps from the manufacturer), then you can input it here. The multilinear table requires us to define the stress and the plastic strain, where plastic strain = total strain - (modulus*stress). The modulus is whatever you have specified as Young's Modulus, which should also be given for your material either from lab data, or from typical tables of material moduli.

Hi Sushant, I’m glad you found the video useful! As for the yield point, post yield the strain will increase rapidly (plastic strain) not the stress. The slope of the bilinear model describes the stress/strain, so a lower slope means less stress and more strain. In fact, a “perfectly plastic” material will have no increase in stress once the material yields.