考虑铆钉位置不确定性的异种轻质金属铆接接头疲劳寿命优化

Fatigue Life Optimization of Dissimilar Light Metal Riveted Joints Considering Rivet Position Uncertainty

针对铆钉位置坐标对铆接接头疲劳寿命的影响问题,采用单行替换法来实现了铆接接头的寿命优化。首先,对铝合金自冲铆接接头进行单调拉伸和疲劳试验研究,通过试验数据拟合获得S-N曲线。然后,建立自冲铆接结构的有限元模型,通过Abaqus进行循环载荷作用下的铆接接头力学分析,研究了铆接点位置对铆接接头力学性能的影响。最后,将铆接点的坐标作为设计变量,铆接结构疲劳寿命为优化目标,基于单行替换法进行全局寻优,获得了铆接接头最大疲劳寿命时的位置坐标,为技术人员开展铆接接头设计提供了参考依据。

For the effect of rivet position coordinates on the fatigue life of riveted joints,Single row replacement method for life optimization of riveted joints.First,in this paper,monotonic tensile and fatigue tests are conducted on aluminum alloy self-piercing riveted joints,thus obtaining S-N curves by fitting the test data.Then a finite element model of the self-piercing riveted structure is established,with a mechanical analysis of the riveted joints under cyclic loading to be carried out by Abaqus to study the effect of the riveting point position on the mechanical properties of the riveted joints.Finally,taking coordinates of the riveting point as design variables and the fatigue life of the riveted structures as optimization objective,the coordinates of the maximum fatigue life of riveting joints can be obtained by a global optimization based on the single row replacement method,which provides a reference for technicians to carry out the design of riveting joints.