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自动车钩钩体在运用中的主要故障是脆性破损和疲劳破损,以及因车辆在驼峰上撞击时的抗弹塑性变形强度不够而发生的弯曲。铸钢自动车钩在各种热处理后抗弹塑性变形、脆性破损和疲劳破损的能力,是在通过钢的实验室综合研究和自动车钩的试验台比较试验来评价的。实验室研究包括确定钢的抗拉和抗冲击弯曲机械性能,评价脆性破损的倾向性和在循环负载条件下的裂纹扩展抗力,以及评价在高于钢的屈服极限的负荷作用下抗低循环疲劳破损强度,实验室试验用试样是由
The main faults in the operation of the auto coupler body are brittle fracture and fatigue fracture, as well as bending caused by insufficient resistance to elastic-plastic deformation of the vehicle when it hits the hump. The ability of the cast steel auto-coupler to resist elastoplastic deformation, brittle fracture, and fatigue failure after various heat treatments is evaluated through a steel laboratory study and a comparative test of a test rig for automatic coupler. Laboratory studies include determining the tensile and impact flexural mechanical properties of steel, assessing the tendencies of brittle failure and the crack propagation resistance under cyclic loading, and evaluating fatigue against low-cycle fatigue at loads above the yield limit of steel Breaking strength, laboratory test specimens are used