基于非线性超声检测的搅拌摩擦焊接头疲劳寿命评价  

Fatigue life evaluation of friction stir welding joints based on nonlinear ultrasonic inspection

作　　者：周海鹏 邢松龄 韩赞东[3] 王旭东 沈旭奎 ZHOU Haipeng;XING Songling;HAN Zandong;WANG Xudong;SHEN Xukui(Beijing Rail Transit Technology and Equipment Group Co.,Ltd.,Beijing 100160,China;Post-doctoral Workstation of Beijing Infrastructure Investment Co.,Ltd./Post-doctoral Mobile Station of Mechanical Engineering,Tsinghua University,Beijing 100101,China;Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]北京轨道交通技术装备集团有限公司,北京100160 [2]北京市基础设施投资有限公司博士后科研工作站/清华大学机械工程博士后流动站,北京100101 [3]清华大学机械工程系,北京100084

出　　处：《无损检测》2022年第12期1-5,17,共6页Nondestructive Testing

摘　　要：焊接接头疲劳寿命的分析与估算一直是轨道交通车辆设计与制造过程中的难点,现有估算方法一般基于有限元仿真进行计算,估算结果往往得不到有效验证。提出了一种疲劳寿命的超声检测与评价方法,对不同疲劳阶段的焊接试件进行了非线性超声检测,提取了等效非线性系数用于评价疲劳损伤的累积程度,根据该参数与疲劳寿命的相关关系构建了基础数据库,并据此基于贝叶斯定理评价了搅拌摩擦焊接头的疲劳寿命。该方法具有低成本、高可靠性等优点,可望推动疲劳寿命评价方法的技术发展。The analysis and estimation for fatigue life of welds have always been difficult in the design and manufacture of rail transit vehicles. The existing estimation methods are generally based on finite element simulation, whose results are often not validated effectively. An ultrasonic inspection and evaluation method for fatigue life estimation was proposed. Nonlinear ultrasonic inspection was performed on the specimens with welds in different fatigue stages. An equivalent nonlinear coefficient was proposed to evaluate the fatigue damage, and the relationship between this parameter and the fatigue life was utilized to construct a database. The fatigue life of the friction stir welding joints was evaluated based on this database according to the Bayesian Theorem. This method has the advantages of low cost and high reliability, and is expected to help promote the technical innovation of fatigue life evaluation methods.

关 键 词：焊缝疲劳寿命 非线性超声检测 搅拌摩擦焊 疲劳寿命评价 

分 类 号：TG115.28[金属学及工艺—物理冶金]