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Fundamentals of Engineering Plasticity by William F.,Hosford

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14 Effects of Pressure and Sign of Stress State

The effects of pressure on the yield locus can be confused with the effects of the sign of the stress. For example, twinning is sensitive to the sign of the applied stresses and causes the yield behavior under compression to be different from that under tension.

S-D Effect

With a so-called strength differential (SD) effect in high strength steels [1], yield strengths under tension are lower than under compression. The fractional magnitude of the effect, 2(|σc| – σT)U+2215[(|σc| + σT] is between 0.10 and 0.20. Figure 14.1 shows the effect in an AISI 4330 steel and Figure 14.2 indicates that it is a pressure ...

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