径向间隙对304L不锈钢振动疲劳性能的影响  

Research on radial gap of 304L stainless steel piping with socket weld under vibration fatigue

作　　者：修俊杰[1] 李杨[1] 张潇予[1] 

机构地区：[1]烟台大学环境与材料工程学院,烟台264005

出　　处：《焊接学报》2017年第8期95-98,共4页Transactions of The China Welding Institution

基　　金：山东省自然科学基金资助项目(ZR2016EEP14)

摘　　要：基于疲劳试验和有限元分析,研究径向间隙对插套焊疲劳性能的影响.疲劳试验表明,应力比较大时,试样易在焊趾处失效,焊趾处裂纹由外向内扩展;应力比较小时,易在焊根处失效,焊根处裂纹由内向外扩展.未失效试样径向间隙高于失效试样.利用有限元软件建立了插套焊有限元模型,分析了径向间隙对焊根和焊点处疲劳性能的影响.结果表明,相对于0.1 mm的径向间隙,0.4 mm径向间隙能降低焊根和焊趾处的应力,降低幅度分别为14%和1.4%,径向间隙越大,焊根和焊趾处的应力峰值越小,疲劳性能越好.Based on fatigue experiment and finite element method (FEM),the effect of radial gap on the vibration fatigue was researched.The test results show that crack with a higher stress tend to originate at the weld toe while for the case of lower stress failures tend to occur at the root.The root failure is that the crack originates at the inside of weld roots and propagates to the outside surface of specimen on the socket side of the weld,the crack of toe failure initiates at the outside surface of the specimen near the pipe side toe of the weld and propagates to the inside surface.The radial gap of runout is higher than that of failure.The effects of radial gap on weld root and weld toe were also investigated by FEM.Results show that the radial gap can significantly reduce the stresses of weld root and weld toe,which decrease 14% and 1.4% with the width of radial gap from 0.1 mm to 0.4 mm.Further,the radial gap can redistribute the stress in the weld root and weld toe,which is beneficial to the fatigue life.

关 键 词：插套焊 振动疲劳 径向间隙 

分 类 号：TG405[金属学及工艺—焊接]