存在不对中缺陷的焊接接头疲劳试验数据修正方法研究(下)  

Research on the Method for Correcting Fatigue Test Data of Welded Joints with Misalignment Defects(Part 2 of 2)

作　　者：张闰琦 王令军 宋坤林 曲华 王成琪 赵金凤 ZHANG Runqi;WANG Lingjun;SONG Kunlin;QU Hua;WANG Chengqi;ZHAO Jinfeng

机构地区：[1]国家高速列车青岛技术创新中心,山东青岛266109 [2]中车齐齐哈尔车辆有限公司大连研发中心,辽宁大连116052

出　　处：《铁道技术监督》2025年第2期36-41,共6页Railway Quality Control

基　　金：国家重点研发计划(2022YFB4300100)。

摘　　要：焊接过程中不可避免产生焊接构件间轴向不对中、角变形等缺陷,这会导致弯曲应力增加,降低结构的抗疲劳性能。采用不同修正公式量化不对中缺陷所导致的应力集中,以等效结构应力为参数,分析承载十字接头与T型接头的疲劳试验数据。考虑不对中缺陷试件在进行疲劳试验时出现的夹具效应,通过修正夹具效应公式,确定含不对中缺陷的焊接接头疲劳试验数据最优修正方法。During the welding process,it is inevitable to produce misalignment defects such as axial misalignment and angular deformation between welded components,which leads to an increase in bending stress and a decrease in the fatigue resistance of the structure.The paper quantifies the stress concentration caused by misalignment defects by using different correction formulas,and analyzes the fatigue test data of load⁃bearing cross joints and T⁃joints by us⁃ing equivalent structural stress as the parameter.Considering the fixture effect that occurs during fatigue test of speci⁃mens with misalignment defects,the optimal correction method for fatigue test data of welded joints containing mis⁃alignment defects is determined by modifying the fixture effect formula.

关 键 词：焊接接头 轴向不对中 角变形 应力集中 疲劳试验 等效结构应力 

分 类 号：TG404[金属学及工艺—焊接]