Second Invariant of Strain#

Second Invariant of Strain = {yes | no}

Description / Usage#

The strain tensor is associated with the deformation of the mesh. Its second invariant indicates the level of shear strain of the mesh. This variable is called IIE in the output EXODUS II file.

The permissible values for this postprocessing option are:


Calculate the second invariant.


Do not calculate the second invariant.


Following is a sample card:

Second Invariant of strain = yes

Technical Discussion#

The second invariant is computed in Goma as


Here Einstein’s summation convention applies, viz.