其次，根据位移协调条件建立滑动体的速度场，并计算各滑动楔块的位移速度；

Secondly, the velocity field was determined based on the conditions of kinematic admissibility.

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下螺母凸顶的滑动零件上有一条小弧线充当楔块。

A small curve in the sliding part of the convex top of the lower nut acts as the wedge.

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沿滑动面产生滑动的塑性楔体。

Sliding of plastic wedges along gliding planes.

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