Im far from a polymer simulation expert, my primary background is with steel/metallic structures, but occasionally I get pulled into projects that require more complicated materials. I have modeled a polymer component using MSC MARC, and preformed stress analysis (static) on this part based on Mooney-Rivlin curves supplied by the material manufacturer.
Now, we are looking to try to predict the dynamic response of this component, and for obvious reasons we need to change our material model. Its relatively easy to generate loading and unloading curves at 2 strain rates (data needed for BB mat model), so were planning on that. However, in MCalibration I see 9 material parameters are calculated. Where Im confused is that in MSC MARC, there are only 5 material parameters. What behaivior(s) are missing from MSCs material formulation. The material paremeters calculated by MSC from the test data are:
and then under the title of Creep Rate Evolution Law
I dont need a dissertation on this, just a quick explanation for dummies 🙂