基于场强法的平板法兰角焊缝接头的疲劳寿命估算方法  

Way to evaluate fatigue life of fillet weld of plate with flange based on stress field intensity

作　　者：郭海丁[1] 武奇[1] 

机构地区：[1]南京航空航天大学能源与动力学院,南京210016

出　　处：《航空动力学报》2008年第6期1082-1086,共5页Journal of Aerospace Power

摘　　要：焊接接头疲劳损伤具有局部性特征.基于应力场强法的基本思想,通过对角焊接接头的场径分析,通过对法兰角焊缝接头应力集中区的弹塑性有限元计算和应力场强数值求解,得到了接头焊趾区局部应力场强.在此基础上,根据光滑试件的S-N曲线,最终得到了法兰角焊缝接头的疲劳寿命的一个估算值.该结果与局部应力应变法相比,疲劳寿命预测精度有较大提高,与试验结果吻合良好.The fatigue behavior of welded joint has local damage characteristics. Based on stress field intensity （SFI） theory, the field diameter of fillet welded joint was analyzed,and the stress field intensity at the weld toe of fillet weld joint of flange was calculated using elastic-plastic finite element method. Based on the calculation results and the results of S-N curve of smooth specimen of the same material, a fatigue life evaluation of flange fillet welded joint was obtained. The precision of fatigue life prediction with SFI method is better than the one with the local stress-strain method, and the result is much closer to the experimental result.

关 键 词：航空 航天推进系统 应力场强法 疲劳损伤 弹塑性有限元 应力集中 疲劳寿命 

分 类 号：V231.95[航空宇航科学与技术—航空宇航推进理论与工程]