周期性载荷后，各组骨折部位活动增加。

After cyclical loading, motion increased in all groups.

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给出了一种利用有限元技术模拟周期性张力载荷作用下孔边角裂纹扩展过程的方法。

A method is proposed to simulate the fatigue crack growth by finite element technique for corner cracks under cyclic tension loading.

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在齿形链传动中，链条承受周期性的交变载荷，其中链节啮入轮齿时产生的冲击载荷影响较大。

In odontoid chain drive, the chain bears a periodical alternating load, in which the impact load produced while the link meshes into the tooth of sprocket makes comparatively big effect.

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