Analysis and Research on Fracture Problem of an Engine Main Bearing Cover
During the engine durability test,an aluminum alloy integral main bearing cover of engine broke.For this problem,electron microscopy was used to analyse fracture,some cracks were found at the thimble of the mold.In addi-tion,metallurgical structure of the fracture was abnormal.Simulate the strength and fatigue of the main bearing cover,and then the results showed that the minimum fatigue safety factor was the fracture position and the fatigue factor did not meet the requirements.Comprehensive analysis showed that the strength of the main bearing cover body did not meet the requirements due to structural design defects and casting defects,and the thimble position was located at the position with the minimum fatigue coefficient,which led to the crack sources,then causing the main bearing cover to break.After opti-mizing structure and casting process of the main bearing cover,the strength as well as fatigue analysis are carried out in the same method.Experiencing reiterative optimization and verification,the optimal design scheme is obtained before the engine durability test proves that the main bearing cover fracture problem is finally solved.
万方数据
维普
