【摘要】 抗疲劳性是飞机铆接结构连接质量评定的关键因素之一,直接影响飞机结构服役安全。针对单钉铆接结构,以工艺参数镦头高度作为控制变量,通过有限元分析钉孔变形及细节应力分布,结合疲劳试验研究结构抗疲劳性的工艺影响,基于钉孔应力分布及疲劳试验提出一种镦头高度控制区间的估计方法。结果表明:控制镦头高度可以显著影响钉孔界面的应力状态分布,并可有效改善铆接结构的抗疲劳性,针对5/32英寸凸头铆钉连接的单钉铆接结构,推荐镦头高度控制区间为1.6 mm~1.9 mm。更多还原

【Abstract】 Fatigue resistance is one of the key factors of the connection quality assessment for aircraft riveted structure,which directly influence the security of aircraft service. Aiming at single riveted structure in this paper,the height of driven rivet head is selected as the control variable,which is one of parameters of riveted process. To study the effect of process on fatigue resistance,fatigue experiments and the finite element method are used to analyze the deformation and stress distribution of rivet hole in detail. A method of height interval estimation of riveted head is proposed based on stress distribution in hole and fatigue experiment. The result shows that the height of riveted head has significant effect on stress distribution in the interface between rivet and hole. The fatigue resistance of riveted structure is effectively improved by controlling the height of driven rivet head.更多还原