材料在变形过程中，应力-应变速率成幂律关系，那个指数就是应变速率敏感性因子。
材料的应变速率敏感性指数与孔洞长大速率通过不同的变形机理图控制着这种过程。
It is controlled by the sensitive index of the strain rate and the cavity growth rate of material.
这就从试验上判明，即使在相同的应力状态下，应变速率敏感性指数也与变形路径密切相关。
These prove that the strain-rate sensitivity index depends tightly on the deformation route from experiment, even on the condition that those stress-state are similar.
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