液压制动钳体疲劳断裂分析

为解决2种典型液压制动钳体的疲劳断裂问题,借助扫描电镜对裂纹类型及裂纹产生的起始位置进行了分析,通过有限元方法证明了疲劳破坏区域存在的设计缺陷,结合钳体断裂位置的实际加工尺寸,提出结构改进方法并通过了试验验证,为类似产品的设计提供了参考。阐述了在没有材料疲劳数据的情况下,计算疲劳利用系数的方法及钳体疲劳试验工况设置的依据。分析了网格尺寸、载荷形式、连接方式的差异对有限元计算结果的影响,证明了简化建模方法的有效性,可用于结构中非接触部位的受力分析。

Fatigue Fracture Analysis of Hydraulic Brake Clamp Body

In order to solve the fatigue fracture problem of two typical hydraulic brake clamp bodies, analysing the type and initial location of the crack by using scanning electron microscopy (SEM), proving the design defects in the fatigue failure area by using Finite Element Method. Combining with actual machining size of the fracture position, the structure improvement suggestions were put forward and verified by experimental tests, which provides reference for the design of similar products. The method of calculating the fatigue utilization coefficient and the setting basis of clamp fatigue test condition were introduced when no material fatigue data can be used. And analysing the effects to the results of the finite element when mesh size, load type and connection mode different. The effectiveness of the simplified modeling method was proved, which can be used for the stress analysis of the non-contact parts of the structure.