飞机起落架刹车盘紧固螺栓断裂原因  

Fracture Causes of Fixing Bolt of Aircraft Undercarriage Brake Disc

作　　者：田浩[1] 陈荣[1] 傅国如[1] 李权[1] TIAN Hao;CHEN Rong;FU Guoru;LI Quan(Beijing Aeronautical Technology Research Center,Beijing 100076,China)

机构地区：[1]北京航空工程技术研究中心,北京100076

出　　处：《理化检验（物理分册）》2020年第12期48-51,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：在飞机起飞前的机务检查中发现某飞机起落架刹车盘紧固螺栓断裂了。采用宏观分析、微观分析、金相检验、硬度测试、氢含量测定等方法对螺栓的断裂原因进行了分析。结果表明:该紧固螺栓的断口具有氢脆断裂特征,其断裂失效性质为氢脆断裂;螺栓在使用中局部发生了环境腐蚀,腐蚀产生的氢被螺栓吸收导致该螺栓发生了氢脆断裂。The fixing bolt of the undercarriage brake disc of an aircraft was found to be broken during the maintenance inspection before the aircraft took off.The fracture causes of the bolt were analyzed by macro analysis,micro analysis,metallographic examination,hardness test and hydrogen content determination.The results show that the fracture of the fixing bolt had the characteristics of hydrogen brittleness fracture,and the fracture failure property was hydrogen brittleness fracture.Environmental corrosion of the local bolt occurred in service.The hydrogen produced by corrosion was absorbed by the bolt,which led to hydrogen brittleness fracture of the bolt.

关 键 词：紧固螺栓 断裂 氢脆 环境腐蚀 

分 类 号：TB303[一般工业技术—材料科学与工程]