30CrMnSiA耳片断裂分析

Failure Analysis of 30CrMnSiA Lugs

30CrMnSiA双耳片在进行冲击试验时发生断裂。通过断口和金相组织观察、硬度检测发现:耳片的组织和硬度均满足要求,断口为韧窝特征。通过分析计算可知,耳片在试验最大加速度时受力接近设计强度值,而监测的最大加速度远高于设计加速度,应力水平超过了耳片材料的设计强度,造成了耳片的过载断裂失效。建议对材料的使用条件进行科学判断,同时对试验过程进行严格控制,避免耳片受到超过试验要求的冲击载荷。

Double lugs fractured in impact testing. Fracture feature, metallurgical structure and hardness detection were observed, metallurgical structure and hardness of the lugs are sized up, and the dimple feature is observed. The Analysis and calculating results indicate that, the lugs were in limiting condition while loading the biggest acceleration. However, the actual acceleration detected was much higher than design＇ s, making the lugs were overload broken. The suggestion is that the using condition of lugs should be judged scientifically. Meanwhile, the testing process should also be controlled strictly, so as not to make lugs inherit overmuch.