As it is mentioned in many studies that one major advantage of the backward sliding mechanism of lag screw is controlled compression of fracture with weight bearing which helps in healing of fracture.
The deficiency of present belt drives design criteria is pointed out to get a start in sliding failure and fatigue fracture failure.
从防止带传动打滑失效和疲劳断裂失效出发，指出现有带传动设计准则之不足。
3
The deep and large cavities are formed on fracture surface and grain boundary sliding and intergranular fracture characteristic is obvious on the optimal superplastic deformation condition.