How to simulate stress-strain curves in the elastic and plastic ranges of materials

[zrx-explorer]

Hi，
I'm new to the mechanics of materials. Now I have an STL file of the structure as shown in the figure. I wish to fix the lower surface of the structure and apply a displacement load to the upper surface, output the force, thereby obtaining a force-load curve (stress-strain curve) that includes the material's elastic and plastic regions, and finally determine the corresponding yield strength and ultimate strength. How can I import an STL file in FEniCS, and how can I implement nonlinear simulation?


Looking forward for your help.