Question

I received the below error mentioning that the MATPRP HEAD card cannot be recognized. How can I resolve this?




Answer

MATGRP - used to assign a material model to several member groups 
MATPRP PLAS - to define the post-yield behavior of the material

The correct input line should be defined as follows:



The MATPRP HEAD line should come first before MATGRP line. 

The MATGRP lines are used to assign the AH36 material model to X different member groups and followed by several MATPRP PLAS lines to define the material model for AH36.

The input needs to be corrected as shown in the sample.