ABAQUS User Subroutines Reference Manual  


2.1.9 Obtaining stress invariants, principal stress/strain values and directions, and rotating tensors

Product: ABAQUS/Standard  

Reference

Overview

For ABAQUS/Standard user subroutines that store stress and strain components according to the convention presented in “Conventions,” Section 1.2.2 of the ABAQUS Analysis User's Manual, a number of utility routines are available for calculating stress invariants, principal stress/strain values, and principal stress/strain directions from the relevant tensors. There is also a utility routine available for transforming tensors to a new basis. These routines are most commonly called from user subroutine UMAT.

The following utility subroutines are available in ABAQUS/Standard to perform tensor operations:

  • SINV (calculate stress invariants)

  • SPRINC (calculate principal values)

  • SPRIND (calculate principal values and directions)

  • ROTSIG (rotate a tensor)

These utility subroutines are described below in alphabetical order.

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