多铆钉自冲铆接头力学性能机理  

Mechanism of mechanical properties of self-piercing riveted joints with multiple rivets

作　　者：邢保英[1] 何晓聪[1] 王玉奇[1] 邓成江[1] 

机构地区：[1]昆明理工大学机电工程学院,昆明650500

出　　处：《吉林大学学报（工学版）》2015年第5期1488-1494,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(50965009)

摘　　要：以3颗铆钉连接的5052铝合金自冲铆接头为对象,通过试验的方法研究多铆钉自冲铆接头力学性能机理。获得了m-o自冲铆接头(简称m-o接头)和m-i自冲铆接头(m-i接头)的静力学和疲劳试验数据,选择正态分布和二参数威布尔分布检验数据的有效性,通过最小二乘法获得疲劳寿命最佳拟合直线和疲劳载荷-疲劳寿命曲线二参数幂函数方程。结果表明:接头静态和疲劳失效形式分别为下板被拉出和下板断裂。铆钉分布结构对接头静强度、变形能力、能量吸收能力、疲劳寿命及它们的稳定性均有影响。m-i接头静力学性能良好,m-o接头整体具有良好的疲劳性能。疲劳测试中,铆钉分布结构会导致首要和次要承载顺序的产生,疲劳断口为首要承载顺序所在位置。The mechanism of mechanical properties of Self-piercing Riveted（SPR）joints of aluminum alloy 5052 sheet with three rivets was investigated by experiments. The static and fatigue experimental data of m-o SPR joint（m-o joint）and m-I SPR joint（m-I joint）were obtained.The effectiveness of the experimental data was tested by normal distribution and two-parameter Weibull distribution.The best-fitting straight line of fatigue lift and two-parameter power function equations of fatigue load-fatigue life curves were acquired by least square method.Results show that the static fatigue failure modes of the SPR joint are the pull-out and fracture of the lower sheet respectively.The static strength,capacity of deformation and energy absorption,fatigue life and their stability of SPR joints with multiple rivets are all influenced by the distribution structure of the rivets.The m-I joints have favorable static property,but the m-o joints have excellent fatigue property overall.During the fatigue test,the sequences of the primary and secondary load bearing are generated by thedistribution structure of rivets,and the fatigue fracture surface is the location of the primary load bearing sequence.

关 键 词：材料合成与加工工艺 多铆钉 疲劳寿命 变差系数 断口分析 

分 类 号：TG447[金属学及工艺—焊接]