## General

#### Why is the imposed elastic strain on the downstream model different from the calculated elastic strain in the original model, when the stress/strain field is imported using INISTATE?

• Solution
Participant

The imposed elastic strain on the downstream model is different, because the reference geometry changes. The results (deformation, strain, etc.) for the original model are relative to the original, undeformed geometry. The results for the downstream model are relative to the deformed geometry. The greater the deformation in the original model, the greater the deviation between the calculated elastic strain at the end of the original analysis and the imported elastic strain beginning of the downstream analysis. Consider a simple stretched bar with the deformed geometry and results transferred to a downstream analysis. The deformations (and resulting strains) in the downstream analysis are relative to the deformed geometry. Thus, for the same displacements, the elastic strains in the downstream analysis would be near zero. See the attached archive. It is a simple example of a fixed-fixed beam that is subjected to a delta temperature. The plastic strain and stress are identical between the original and downstream analysis, but the elastic and total strain are different.

Attachments:
1. 2055689.zip
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