Draft: [ProcessLib] Added a restriction for computing strain
For the restart computation, the displacement may not be reloaded but the initial strains are always available. This MR adds a restriction for computing strain, i.e. the strain is only computed as \text{B} u
if \|u\|>0
.
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Feature description was added to the changelog -
Tests covering your feature were added? -
Any new feature or behavior change was documented?