TB8钛合金高锁螺栓安装断裂原因
Reasons for installation fracture of TB8 titanium alloy high lock bolt
摘 要
某TB8钛合金高锁螺栓在装配过程中发生断裂，采用宏观观察、断口分析、金相检验、力学性能测试等方法对其断裂原因进行分析，结果表明：在安装过程中，螺栓与安装孔不同轴，使螺栓受额外弯曲应力，在外加弯曲应力和轴向载荷的共同作用下，螺栓发生过载断裂。为了进一步验证螺栓与安装孔不同轴对螺栓破坏拉力的影响，设计了在螺栓头下放置不同斜度垫片的拉伸试验方案，得出随着斜度的增加，螺栓破坏拉力逐渐降低。
断裂
过载
力学性能
high lock bolt
fracture
overload
mechanical property
Abstract
The fracture of a TB8 titanium alloy high lock bolt occurred during the assembly process. The fracture causes were analyzed by means of macroscopic observation, fracture analysis, metallographic examination and mechanical property test. The results show that during the installation process, the bolt was subjected to additional bending stress due to different axes of the bolt and the installation hole. Under the combined action of external bending stress and axial load, the bolt was overloaded and fractured. In order to further verified the influence of different axes of the bolt and the installation hole on the failure tensile force of the bolt, the tensile test scheme of placing different inclined gaskets under the bolt head was designed. It was concluded that the failure tensile force of the bolt decreased gradually with the increase of the inclination.
中图分类号 TG115.5 DOI 10.11973/lhjy-wl202210017
所属栏目 质量控制与失效分析
基金项目
收稿日期 2022/2/28
修改稿日期
网络出版日期
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备注许永春(1982-),男,硕士,高级工程师,主要从事航空航天紧固件失效分析及理化检验工作,xuyc1120@163.com
引用该论文: XU Yongchun,LI Xiangjun,LI Xujian,SUN Xiaojun,DONG Chenxi,ZHOU Yubao. Reasons for installation fracture of TB8 titanium alloy high lock bolt[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2022, 58(10): 67～70
许永春,李祥军,李旭健,孙晓军,董晨曦,周玉宝. TB8钛合金高锁螺栓安装断裂原因[J]. 理化检验－物理分册, 2022, 58(10): 67～70
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参考文献
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【4】姜杰凤,董辉跃,柯映林.高锁螺栓干涉连接中极限干涉量[J].机械工程学报,2013,49(3):145-152.
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【7】房奇,陈涛,王伟.高强螺栓疲劳性能研究现状[J].结构工程师,2020,36(4):218-225.
【8】董新权,杨冬梅.新能源客车电容支架安装螺栓的断裂原因分析[J].理化检验(物理分册),2017,53(3):214-216,224.
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