plastic stage

It is shown in the static and dynamic compression stress-strain results, the curve has a typical three stages form. There are elastic stage, plastic stage, and close-grained stage after crushing.

从其静-动态压缩应力-应变曲线中可以看出，曲线是典型的三阶段形式，即弹性阶段，塑性阶段，及压溃后的密实阶段。

The torsional stress of element in elastic stage and plastic stage is analyzed, the torsional failure phenomenon of element is theoretically explained, and three quarters factor of yield stress formula in torsinal test of circle shaft of plastic materials is certificated.

对构件在弹性阶段和塑性阶段时的应力进行了分析，对构件扭转破坏现象进行了理论上的解释，并对塑性材料的圆轴扭转实验屈服应力公式的3/4系数给出了证明。

The study shows that the combined theory of strength and stability can present the calculation equations of the engineering structure in the plastic stage, which makes the calculation of engineering structures more easily.

研究认为强度稳定综合理论可以给出工程结构在塑性阶段的计算公式，这使得对工程结构的临界承载能力的计算更加简便。