What material model should I use for the Molded Pulp Packaging model and why?


      Hi everyone,

      I am conducting a drop test of a rigid plate on an MPP element and calculating the stress and displacement of the material. Should I use a Kinematic Bilinear Hardening or Isotropic Bilinear Hardening Model for my analysis? Or is there another appropriate model for this?  


    • Ashish Khemka
      Ansys Employee

      Hi Navid,

      In the context of metals:

      Isotropic hardening can be used for large-strain analyses of metals (> 5-10% true strain). Isotropic hardening is not meant for cyclic loading applications because it does not account for the Bauschinger effect. Moreover, applicability of isotropic hardening for non-proportional loading is left up to the user, although, generally speaking, it is meant for proportional loading only.
      On the other hand, kinematic hardening is usually meant for non-proportional, cyclic loading since the Bauschinger effect is approximated with this model. However, it is generally meant for small-strain applications.
      Ashish Khemka
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