Plastic strain vs Stress curve for multi linear isotropic hardening

- April 19, 2019 at 4:14 am
  
  irudayajeyaprakash.antonysamy
  Subscriber
  
  I am using PP material for my projects. In stress strain curve of PP, Yield strength value 50 MPa and UTS value 20 MPa. Stress strain curve is downward after Yield value.
  
  in this case How to load the plastic strain vs Stress curve for multi linear isotropic hardening?
- April 19, 2019 at 10:46 am
  
  peteroznewman
  Subscriber
  
  Here is your figure from above.
  
  This figure is the Engineering Stress and Engineering Strain and includes post-necking results.
  
  If you convert to True Stress and True Strain and exclude post-necking results, then you will have a curve that has only positive slope.
  
  Read this post about necking. Read this post about conversion to True Stress and Strain.