摘要
针对航空用紧固件抗剪性能这一关键特征,分别建立了毛坯件和热处理工况航空用Ti-6Al-4V紧固件的双剪切三维数值模型,揭示了Ti-6Al-4V紧固件双剪切演化过程及抗剪失效机理。结果表明,该模型可以有效模拟钛合金紧固件双剪切工况下的载荷-位移曲线,剪切强度预测平均误差为0.5%。热处理后Ti-6Al-4V紧固件的剪切强度提升了35%。在抗剪过程中,工件的应力集中由下刀面接触域逐渐扩展到整个受剪面,直至工件抗剪失效。该研究为钛合金紧固件抗剪性能分析及提升提供理论依据和指导。
Aim at the key feature of shear performance of aviation fasteners,a three-dimensional numerical model of Ti-6Al-4V fasteners under double shear conditions of blanks and heat treatment is established.The shear resistance of Ti-6Al-4V fasteners and their shear evolution process are correspondingly revealed.The results show that the model can accurately simulate the load-displacement curve of titanium alloy fasteners under double shear conditions,and the average error between the shear strength obtained and the experimental value is 0.5%.After heat treatment,the shear strength of Ti-6Al-4V fasteners is increased by 35%.In the process of shearing,the stress concentration phenomenon of the workpiece gradually extends from the contact of the lower knife surface to the entire shear surface until the workpiece fails to be sheared.This research can provide a theoretical basis and guidance for improving the shear strength of titanium alloy fasteners.
作者
徐昊
马艳云
袁娅
刘婧颖
周强
刘畅
XU Hao;MA Yanyun;YUAN Ya;LIU Jingying;ZHOU Qiang;LIU Chang(Tianjin Key Laboratory of Fastening Technology,Aerospace Precision Co.,Ltd.,Tianjin 300300,China;School of Mechanical Engineering,Tiangong University,Tianjin 300387,China)
出处
《组合机床与自动化加工技术》
北大核心
2023年第9期35-38,共4页
Modular Machine Tool & Automatic Manufacturing Technique
基金
天津市紧固连接技术企业重点实验室项目(TKLF2022-02-C-01)
天津市技术创新引导专项基金项目(22YDTPJC00110)。
