ABAQUS User Subroutines Reference Manual  


SINV (calculate stress invariants)

Interface

      CALL SINV(STRESS,SINV1,SINV2,NDI,NSHR)

Variables to be provided to the utility routine

STRESS

A stress tensor.

NDI

Number of direct components.

NSHR

Number of shear components.

Variables returned from the utility routine

SINV1

First invariant.

where is the stress tensor.

SINV2

Second invariant.

where is the deviatoric stress tensor, defined as