摘要
转运吊装飞机时发生前机身意外触地的严重事故,现场检查发现前挂点的吊挂螺栓断裂。对失效吊挂螺栓的宏微观特征和金相组织进行检查,并对其硬度和化学成分进行检测,结果表明,吊挂螺栓断裂性质为脆性过载断裂。通过普查零件设计、生产和吊装现场情况,明确主要原因为组织异常(回火索氏体基体含大量铁素体)、脆性大、设计安全裕度不足等共同作用导致,并提出连接方式由螺栓改为合成纤维吊装带的改进措施,现场试验结果表明三点吊装更简便、更稳定、更可靠。
When an aircraft was lifted,its forebody fell down to the ground accidently. It was found that the hanger bolt of the front hanging point had fractured. Macro and micro appearance observation,metallographic examination,hardness and chemical composition analysis were performed on the fractured hanger bolt. The results show that the fracture of the hanger bolt was brittle overload facture. Through examining the design,production and installation of the bolt,it was found that the fracture of the bolt was caused by the co-effect of abnormal structure（ the matrix of tempered sorbite contains a large amount of ferrite）,excessive brittleness and insufficient safety margin. It was suggested that the bolts should be replaced with synthetic fiber hoisting belt.Onsite test results show that three point lifting is more simple,stable and reliable.
作者
刘艳稳
张跃飞
陈林
张明
LIU Yan-wen;ZHANG Yue-fei;CHEN Lin;Zhang Ming(AVIC Service ＆ Support（Tianfin）Co.,Ltd.,Tianfin 300310,China;The Military Representation Office in No.162 Factory of the PLA,Guizhou Anshun 561018,China)
出处
《失效分析与预防》
2018年第4期218-222,共5页
Failure Analysis and Prevention
关键词
吊挂螺栓
脆性过载断裂
沿晶
韧窝
准解理
hanger bolt
brittle fracture
intergranular feature
dimple
quasi-cleavage
