应力回线的长短会影响机械构件弹性变形的大小，在机器或机构设计中，通过改变应力回线的长度，从而提高机器的刚度和工作精度。
In the design of machine, changing the length of stress close-line can improve the rigidity and working precision of the machines.
通过构筑PM空间密度函数，求出饱和岩石的应力—应变状态方程，并模拟了其轴向应变—径向应变滞后回线。
Through constitution of PM space density function, the stress-strain state equation for saturated rocks has been defined and the hysteresis loops of axial stress-radial stress has been simulated.
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