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Using VGETVRM to compute strain in VUSDFLD ( abaqus explicit subroutine)

Submitted by arash_n on
research
metal forming

hi everybody.

I've used vgetvrm in vusdfld to calculate strain.

I have two question.



1- what's the differences between tensor strain and engineering strain?

I read user subroutine manual and it says"The shear strain components returned from utility subroutine VGETVRM are tensor components and not engineering components."



2-I want to calculate PE11 and PE22 with vgetvrm. but my results are strange.for example PE11 change between -11.14033 and 75.25797.

and PE22 change between -1.5974975E-04 and 4.7500171E-03



.while PE11 should be between -0.1 and 0.9

PE22 should be between -1.273 and 0.1



Thanks in advance.

good luck.