求解路径对焊接接头热点应力计算结果影响的分析

Effect of Solving Path on Hot Spot Stress Result of Welded Joints

焊接接头疲劳应力分析方法多种多样,热点应力法能很好通过有限元技术进行求解,但其受到很多因素的影响。本文通过有限元法在验证了热点应力法对网格非常敏感和外推法对其影响不大的情况下,重点分析了焊趾上峰值路径和中心路径取外推点进行热点求解所得热点应力的偏差,结果表明不同取值路径下的热点应力相差不大,对热点应力的影响有限。

there were many methods on fatigue stress analysisof welded joint, hot spot stress method is fit for finite element technology, but it is effected by many factors. In this paper, grid sensitivity and extrapolation insensitivity were verified by FEA. And hot spot stress of peak path and center path were solved. The result show that the bias of hot spot stress is a little under different paths,no affect for hot spot stress.