Implementing a user material model VUMAT requires input on the *DEPVAR option in Abaqus. Failure to do so results in a warning via the .DAT file
"USER SUBROUTINE UMAT WILL BE USED WITH THE STAVEV ARRAY
DIMENSIONED TO ZERO SINCE THE *DEPVAR OPTION IS NOT USED WITH THIS
MATERIAL. CONSEQUENTLY, DEFINING STATEV ENTRIES IN SUBROUTINE UMAT
WILL CAUSE CODE EXECUTION ERRORS"
I yearn to understand these SDVs, when and when not to use them. Does it depend on the material model?
Specifically to the hyperelastic models such as Neo-Hookean or Mooney-Rivlin, what are the SDVs in these two cases?
Thank you very much.