基于道路载荷谱的车身焊点疲劳寿命分析

针对目前汽车焊点疲劳分析方法精度低、建模复杂等问题,以某自主SUV车身焊点为研究对象,采集道路载荷谱,通过载荷虚拟迭代得到底盘与车身连接点的载荷.研究结果表明,对车身焊点分别使用基于力(载荷)和应力的疲劳分析,可以准确预测试验样车焊点开裂位置,缩短焊点疲劳分析周期.改进后的样车顺利通过耐久试验场验证.

Fatigue analysis of vehicle body welding joints based on road load spectrum

As to the problems of low accuracy and modeling complexity of current methods for vehicle welding joint fatigue analysis, taking the welding joints of an independent SUV body as the research object, the road load spectrum is collected, and then the loads of connection points between the chassis and body are obtained by load virtual iteration. The results show that the fatigue analysis of vehicle body welding joints based on force(load) and stress can accurately predict the locations of the welding joint cracks of the test vehicle, and the fatigue analysis cycle of the welding joints can be shorten. The improved test vehicle can pass the verification of durability test field successfully.