Third Invariant of Strain

Third Invariant of strain = {yes | no}

Description / Usage

The strain tensor is associated with the deformation of the mesh. Its third invariant indicates the volume change from the stress-free state (IIIE = 1.0 indicates no volume change). This variable is called IIIE in the output EXODUS II file.

The permissible values for this postprocessing option are:

yes	Calculate the third invariant.
no	Do not calculate the third invariant.

Examples

Following is a sample card:

Third Invariant of strain = yes

Technical Discussion

The mathematical definition of the third invariant is related to the determinant of the strain tensor, which is defined for the various constitutive equations in the manual entry for the Solid Constitutive Equation card.

References

No References.