弹性模量对异种材料螺栓连接性能的影响
Effect of Elastic Modulus on Connection Performance of Dissimilar Material Bolted Joint
于喆 1周宇晨 1邓家蓉 1刘建华 1朱旻昊1
作者信息
- 1. 西南交通大学材料先进技术教育部重点实验室,成都 610031
- 折叠
摘要
利用理论分析、数值模拟和试验研究相结合的方法,分析被连接件弹性模量对螺栓连接结构力学性能和动态响应的影响;使用光学显微镜和扫描电子显微镜分析螺纹表面损伤,并讨论被连接件弹性模量对螺栓连接结构疲劳寿命的影响.结果表明:随着被连接件材料弹性模量增大,连接结构松弛系数Z增大,螺栓内力系数Φ和应力幅σα减小;螺栓螺纹承载面上存在剥落坑、犁沟以及塑性流动痕迹,且被连接件弹性模量越大,螺纹表面损伤程度越低,螺栓剩余轴向力越高,服役寿命提高.
Abstract
The effect of the elastic modulus of connected piece on the mechanical properties and dynamic response of bolted joint structure was analyzed by means of theoretical analysis,numerical simulation and experimental study.Optical microscopy and scanning electron microscopy were used to analyze thread surface damage,and the effect of the elastic modulus of connected piece on the fatigue life of bolted joint structure was discussed.The results show that with the increase of the elastic modulus of the connected piece material,the relaxation coefficient Z of bolted joint structure rises,while the internal force coefficient Φ and the stress amplitude σα decrease.There are peeling pits,furrows and plastic flow marks on the bearing surface of bolt threads.With the increase of the elastic modulus of connected piece,the damage degree of thread surface lowers,and the residual axial force of bolt increases,leading to a longer service life.
关键词
螺栓连接/松弛系数/内力系数/应力幅/疲劳寿命Key words
bolted joint/relaxation coefficient/internal force coefficient/stress amplitude/fatigue life引用本文复制引用
基金项目
国家自然科学基金(52075460)
国家自然科学基金(U2141212)
中央高校基本科研业务费专项(2682022CX043)
出版年
2024
NETL
NSTL
万方数据