2. Plasticity criterion
2.1 Definition and general properties
We aim to generalize the notion of plastic flow threshold observed in the one-dimensional case of tensile testing.
In this case, the set of possible uniaxial stresses σ verifies the scalar relationship (figure 8 c in the
Stresses σ < σ 0 correspond to those where the material remains rigid, and the case σ = σ 0 defines the stress allowing plastic deformation.
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Plasticity criterion
Flow law
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