自冲铆接疲劳强度的研究概况

由于在铆接孔孔壁处有较多毛刺,导致在自冲连接中被冲孔的面上的裂纹较容易扩展,是疲劳失效的主要形式.自冲铆接疲劳裂纹的扩展是决定整个疲劳寿命的重要组成部分,特别是对于自冲铆接这样有冲孔缺陷的连接结构来说,裂纹扩展寿命更为重要.分析了影响自冲铆接疲劳强度的主要因素是材料的性能、铆接点的质量,并得到自冲铆接疲劳各个阶段变化机理.

Introduction of Fatigue Strength in Self-piercing Riveting

There is a lot of burr at the hole of self-piercing riveting joint,so it is easy to enlarge the crack growth at this hole.The fatigue crack growth of self-piercing riveting is an important part that determines the fatigue life,crack propagation life of such link structure is even more important,especially for defects of the self-piercing riveting.The main crack propagation of fatigue failure is at the surface of the self-piercing riveting hole.The paper analyzes that the main factors of fatigue strength in self-piercing riveting are mainly related to the performance of materials,as well as the quality of the riveting point.This paper also reveals the fatigue mechanism of self-piercing riveting.