铆钉数量及间距对自冲铆接头性能的影响

Influence of Number and Distance of Rivets on the Performance of Self-Piercing Riveted Joints

为研究铆钉数量及铆钉间距对自冲铆接头性能的影响,首先采用数值模拟和试验的方式优化了铆接参数,制备了三组不同形式接头;基于拉伸-剪切实验研究了各组接头的静力学性能及其失效形式;并运用MATLAB 2014b用户自定义开发平台精确计算出各组接头的能量吸收值。结果表明:数值模拟结果与实验具有良好的一致性;单铆钉接头失效形式为铆钉从下板完全拉出,双铆钉接头失效形式为板材断裂失效;双铆钉接头性能明显优于单铆钉接头,而铆钉间距对接头静失效载荷和能量吸收性能的影响较小。

In order to study the influence of the number and distance of rivets on the performance of self-piercing riveted joints,the numerical simulation and experiments were conducted to optimize the parameters of self-piercing riveting（ SPR）,and three different types of joints were made. The static performance and failure modes of different joints were studied based on the tensile-shear tests. And the energy absorption value was calculated accurately though the user defined development which is based on MATLAB R2014 b platform. The results show that the numerical simulation result was highly identical to the experimental result. The single-riveted joints failed by the rivet being pulled out from the lower sheet,and the double-riveted joints failed due to the sheet fracture. The performance of double-riveted joints was obviously superior to that of single-riveted joints. However,the distance of rivets had little influence on the static failure strength and energy absorption performance.