The main course of fatigue fracture is due to existence of the inclusion in the material. The inclusion induce crack initiation, the crack propagation and the axe fracture in the circle stress.
疲劳断裂的主要原因是在材料中存在的夹杂物诱发裂纹源，在循环应力的作用下裂纹扩展导致断裂。
This sets up a vicious circle of increasing myopia, stronger glasses, and increased focusing stress.
这就形成恶性循环，近视加重，眼镜加深，调焦压力加重。
The Mohr-Coulomb model is based on plotting Mohr's circle for states of stress at failure in the plane of the maximum and minimum principal stresses.
莫尔-库仑模式基于莫尔圆来判断最大和最小主应力平面上的破坏应力状态。
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