MAT_063
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Hello,
I want to run a simulation using MAT_063 (Crushable Foam), with Model 1 selected in the material card. I have read the documentation for this material model, and as far as I understand, the material requires the yield stress as a function of volumetric strain. My first question is whether I should provide only the plastic part of the stress–strain curve obtained from experiments, or if the material requires the entire stress–strain curve. Also, is it possible to use stress–strain data obtained from a uniaxial compression test?
The other question concerns a warning I receive in Keyword Manager → Model Check → Keyword Check for the defined material (MAT_63). The warning message states: "MAT_CRUSHABLE_FOAM (ID: 1): curve 1 does not monotonically increase." The experimental stress–strain curve contains drops in stress, as shown in the figure below as an example. What should I do in this case to be able to use this material model and resolve the warning?
Does anyone have any ideas about these questions?
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