Multilinear Isotropic Hardening with PETG

- April 2, 2022 at 2:00 pm
  
  Jake_Bils
  Subscriber
  
  Hi All,
  Been fiddling around with this for a while. The experimental data I am basing this off is already true stress/strain (tried converting just in case to no avail). I have yet to find any modelling using this material, inputting the values is difficult with a material with such extreme strain hardening. Due to the initial negative slope in the plastic region, I have to start the value inputs from a larger strain than all examples I have seen, and is far from the yield strength. Below is the data I am gathering and my multilinear isotropic inputs.
- April 5, 2022 at 4:36 pm
  
  John Doyle
  Ansys Employee
  
  MISO is intended for modeling ductile metals, not plastics. Your best bet is to try using the Three Network Model (TNM) option intended for thermoplastics. Please refer to Section 4.6.12.1 of the MAPDL Material Reference guide along with the related references.
  See also Section 6.1.9 for TNM curve fitting tips

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