When the stree strain relationship is the weak hardening, the relationship between stress ratio and strain incremental ratio shows the straight line with two different slopes.
当材料的应力应变关系为弱硬化型时，应力比与应变增量比关系为两段斜率不同的直线；
When the stree strain relationship is the weak hardening, the relationship between stress ratio and strain incremental ratio shows the straight line with two different slopes.
当材料的应力应变关系为弱硬化型时，应力比与应变增量比关系为两段斜率不同的直线；
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