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Mechanics of Solids and Materials by Vlado Lubarda, Robert Asaro

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PART 6: PLASTICITY AND VISCOPLASTICITY

26 Phenomenological Plasticity

When stressed beyond a critical stress, ductile materials such as metals and alloys display a nonlinear plastic response. This is sketched in Fig. 26.1 for a uniaxial tensile test of a smooth specimen, where some relevant terms are defined. In general, plastic yielding is gradual when resolved at typical strain levels (e.g., 10–4). A critical stress, called the yield stress, is defined, which is the stress in uniaxial tension, or compression, required to cause a small, yet finite, permanent strain that is not recovered after unloading. It is common to take this onset yield strain ...

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