2. Geometric and kinematic description of processes
Figure 5 shows a schematic diagram of the main processes involving plastic deformation of solid-state metal. It should be remembered that the plasticity of a material corresponds to its ability to exhibit, after application of a state of stress verifying the plasticity criterion , whose critical value is defined by the flow stress σ 0 , a permanent deformation leaving its volume invariant to a first approximation (§
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Geometric and kinematic description of processes
Fundamental physical phenomena
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"Metal forming and foundry"
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