SUS301L不锈钢焊接接头的高周疲劳实验研究  

Experimental Study on High-cycle Fatigue of SUS301L Stainless Steel Welded Joint

作　　者：米聪聪 高芳清[1] 罗会亮[1] MI Congcong;GAO Fangqing;LUO Huiliang(School of Mechanics and Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学力学与工程学院,成都610031

出　　处：《实验科学与技术》2020年第2期41-45,共5页Experiment Science and Technology

摘　　要：对SUS301L不锈钢Laser-MAG混合焊对接接头进行了高周疲劳实验研究,考虑了应力比对高周疲劳寿命的影响,并采用IIW规范推荐的热点应力法对焊接接头的疲劳寿命进行安全评定。实验分析与研究结果表明,应力比对焊接接头试件的疲劳寿命有明显影响,疲劳寿命随应力比的提高而降低;基于热点应力的设计曲线和应力比修正方法不适用于不锈钢焊接接头的疲劳寿命评估,采用Walker等效热点应力可以合理反映描述应力比对焊接接头疲劳寿命的影响。High-cycle fatigue tests on SUS301L stainless steel Laser-MAG hybrid welded butt joint were conducted with considering the effect of stress ratio.The fatigue life of welded joint was evaluated by using the hot spot stress method recommended by the IIW code.The experimental analysis and research results show that the stress ratio has a significant effect on the fatigue life of the welded joint specimens,and the fatigue life increases with the increase of the stress ratio.The design curves based on the hot spot stress method and stress ratio modification methods can not be applicable to fatigue life evaluation of the SUS301L stainless steel welded joint.The effect of stress ratio on the fatigue life of welded joint can be reasonably reflected by using the Walker’s equivalent hot spot stress.

关 键 词：焊接接头 应力比 疲劳寿命 热点应力 Walker等效应力 

分 类 号：TP75[自动化与计算机技术—检测技术与自动化装置]