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4. Applications
4.1 Practical illustrations
4.1.1 Four most commonly used plasticity criteria
These criteria are used both to express the equations of elastic limit surfaces, as defined in 2.3, and surfaces describing limit stress states ("plasticity criteria"), which the material cannot exceed. These criteria apply to the non-viscous behavior of solid materials, and all four are based on the assumption of isotropic material behavior. They can therefore all be expressed either in terms of the three invariants of the stress matrix,...
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