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Create a material model as described in
Defining a porous metal plasticity model.
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From the menu in the Edit
Material dialog box, select Porous Failure
Criteria.
A Suboption Editor appears.
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Enter a value for the Total volume void fraction at total
failure, .
The default is 1.
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Enter a value for the Critical void volume
fraction (threshold of rapid loss of stress carrying capacity),
.
The default is .
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Click OK to return to the Edit
Material dialog box.
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