1. Agreed assumptions
Certain assumptions necessary for this theory have been discussed or adopted. We will assume :
that the response to a mechanical load does not depend on the hydrostatic pressure p (§ 2.2 of the file
[42] that the material is isotropic, which means that its mechanical properties are independent of the direction of loading;
that its behavior is the same when the stress state σ is changed to - σ (an assumption already adopted to interpret the bending test in § 3.2 of the
[42]
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Agreed assumptions
Plasticity criterion
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