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对某汽车失效的拖车后轴进行了材料分析、断口分析及力学分析。结论为：导致车轴断裂的根本原因是超载运行，说明对车辆的不恰当使用会导致意外事故的发生，提请用户在任何情况下都不应超载运行。
The material analysis, fracture analysis and mechanics analysis of the rear axle of an invalid car trailer were carried out. The conclusion is: The root cause of axle fracture is overloaded operation, indicating that improper use of vehicles will lead to accidents, to bring the user under any circumstances should not overload operation.