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The strain rate expressed in terms of conventional linear strain is e. . de d(L - L0)
IL0 _ 1 dL v 6 dt dt L0dt L0 Thus, the conventional strain rate is proportional to the
crosshead velocity. In a modern testing machine in which the crosshead ...
For low-temperature deformation the strain-rate dependence of the flow curve
can be neglected and an instability (load drop) in the flow curve will occur when1
Ye-^Y'cp (9-49) Equation (9-49) explains why load drops due to adiabatic
10s 104 10* 10° 10"2 10"4 10-6 10-8 Choroc,eris,ic 10-8 10-6 10-4 10-2 10° 102
104 106 time, sec Strain rate, sec- Fig. 14-26 Spectrum of strain rates for
mechanical testing. (After Lindholm.) 1 percent strain at the corresponding strain
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Elements of the Theory of Plasticity
Plastic Deformation of Single Crystals
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