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Fundamentals of Engineering Plasticity by William F.,Hosford

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16 Plasticity Tests

Most data on plasticity are derived from tensile tests. Stress-strain data may also be derived from other tests.

Tension Tests

Necking, as described in Chapter 13, starts when dσU+2215dε = σ. Once necking starts, the stress in the necked region is no longer one of uniaxial tension. As material in the center of the neck is being stretched in the axial direction, it must contract laterally. This contraction is resisted by the adjacent regions, immediately above and below, that have larger cross sections and are therefore not deforming. The net effect is that the center of a neck is under triaxial tension.

Figure 16.1 shows the stress distribution ...

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