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某型号飞机电缆装配前进行例行检查时,发现ZG0Cr14Ni5Mo2Cu上位锁支臂开裂。通过现场调查、对断裂件的材料成分分析、金相组织观察、断口的宏微观观察、硬度检测以及设计结构、受力及现行工艺等综合分析,以确定该上位锁支臂断裂的性质及产生原因。结果表明:上位锁支臂的断裂为过大的装配应力、校形残余应力与氢共同作用下的氢致脆断造成的。此案例分析中发现了隔板设计结构、校形的残余应力问题,为此提出了合理的改进建议。
Routine inspection of a model aircraft cable prior to assembly showed that the ZG0Cr14Ni5Mo2Cu high-position lock arm was cracked. Through the field investigation, the material composition analysis, microstructure observation, macro and micro observation of fracture, hardness testing, design structure, force and current technology were analyzed comprehensively to determine the nature of the fracture of the upper locking arm and its occurrence the reason. The results show that the fracture of the upper lock arm is caused by the excessive assembly stress, the residual stress of the shape and the hydrogen brittle fracture caused by hydrogen. In this case analysis, the problem of the design of diaphragm and the residual stress of the shape of the diaphragm was found, and reasonable suggestions for improvement were put forward.