某型飞机转接环螺钉断裂原因  

Causes of adapter ring screw fracture of a certain type aircraft

作　　者：赵世炜 卜嘉利 孟令琪 李艳明 刘明坤 ZHAO Shiwei;BU Jiali;MENG Lingqi;LI Yanming;LIU Mingkun(AECC Shenyang Engine Research Institute,Shenyang 110015,China)

机构地区：[1]中国航发沈阳发动机研究所,沈阳110015

出　　处：《理化检验（物理分册）》2023年第9期54-56,共3页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某型飞机转接环和发动机安装边的连接螺钉发生断裂。采用宏观观察、化学成分分析、扫描电镜及能谱分析、金相检验、十字槽深度检测、力学性能测试等方法对螺钉断裂原因进行分析。结果表明:飞机服役时,含有氯元素的腐蚀性介质沉积在螺钉十字槽处,且螺钉的十字槽深度超出标准要求,使该部位产生应力集中,在二者的综合作用下,十字槽根部发生应力腐蚀开裂,裂纹由十字槽根部向外表面扩展,最终导致螺钉发生断裂。The connecting screw between the adapter ring and the engine mounting edge of a certain type aircraft was broken.The causes of screw fracture were analyzed by macroscopic observation,chemical composition analysis,scanning electron microscopy and energy spectrum analysis,metallographic examination,cross groove depth detection and mechanical property test.The results show that the corrosive medium containing chlorine element was deposited at the cross slot of the screw during the service of the aircraft,and the depth of the cross slot of the screw exceeded the standard requirement,which caused stress concentration in this part.Under the combined action of the two,the stress corrosion cracking of the screw occurred at the root of the cross slot,and the crack extended from the root of the cross slot to the outer surface,which eventually led to the fracture of the screw.

关 键 词：飞机转接环 螺钉 十字槽深度 应力腐蚀开裂 

分 类 号：TB31[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]