How to simulate a PLA compression test?

- October 7, 2021 at 5:54 pm
  
  Masumehmoridi
  Subscriber
  
  I have a sample of poly lactic acid and the dimensions are: 1x1x1cm. I did a compression test on it and got the stress-strain curve. One surface was fixed and from the opposite surface, we applied load. Now I want to simulate it, can you please help me? Since the plasticity happened should I select multilinear isotropic hardening like this video https://www.youtube.com/watch?v=rCFmcNWRds4&t=201s ? Which type of element should I use?
- October 13, 2021 at 11:04 am
  
  jonsoln
  Subscriber
  
  If you want to recreate the compression test beyond the linear phase you will need a plasticity model. Multilinear isotropic hardening will work fine, just make sure you input true stress and plastic strain (not engineering stress and strain). Solid elements will be needed since your body doesn't resemble a line body or surface body, but this is determined by the geometry you have created. When you generate your mesh, Ansys will automatically select Solid186 (Hex20) which works well.
  If you are new to Ansys Mechanical I would suggest finding some tutorials that can guide you to setting up the analysis.
  Good luck!