铝合金双面焊对接接头内部缺陷扩展行为分析  

Analysis of Internal Defect Propagation Behavior of Aluminum Alloy Double-sided Welding Butt Joint

作　　者：刘韶庆 王皓宇 钱宏亮[2] 陈志皓 刘钇洲 王苹[2] LIU Shaoqing;WANG Haoyu;QIAN Hongliang;CHEN Zhihao;LIU Yizhou;WANG Ping(National Innovation Center of High Speed Train,Qingdao 266109,China;School of Ocean Engineering,Harbin Institute of Technology at Weihai,Weihai 264209,China)

机构地区：[1]国家高速列车技术创新中心,山东青岛266109 [2]哈尔滨工业大学(威海),山东威海264209

出　　处：《电焊机》2024年第8期90-95,共6页Electric Welding Machine

基　　金：山东省重大科技创新工程计划资助(2021ZDPT02)。

摘　　要：基于ABAQUS和FRANC3D联合仿真方法分析了铝合金双面焊对接接头中内部缺陷在疲劳荷载作用下的裂纹扩展行为。对比接头全模型中不同裂纹深度a下裂纹尖端应力强度因子K及疲劳寿命N,验证了对称模型的准确性,进而基于对称模型分析了不同形状比(深度a/长度2c)下初始缺陷的疲劳扩展规律。结果表明:当椭圆形缺陷的深度a不变而长度2c逐渐增大时,初始应力强度也随之增加,试件的疲劳寿命显著降低,当长轴长度增加3倍时,疲劳寿命降低了50%;随着裂纹的扩展,a/c的比值逐渐趋近于1,即形状趋近于圆形。In this study,the crack propagation behavior of internal defects in aluminum alloy double-sided welded butt joints under fatigue load was analyzed based on the joint simulation method of ABAQUS and FRANC3D.The accuracy of the symmetric model was verified by comparing with the stress intensity factor K and fatigue life N at the crack tip under different crack depth a in the full model of the welded joints.Based on the symmetric model,the fatigue propagation law of initial defects under different shape ratios(depth a/length 2c)was analyzed.The results show that when the depth a of the elliptical defect is constant,the initial stress intensity gradually increases with the increasement of the defect length 2c,and the fatigue life of the specimen is significantly reduced.When the length of the long axis is increased by 3 times,the fatigue life is reduced by 50%.As the crack propagates,the ratio of a/c gradually approaches 1,that is,the shape is close to a circle.

关 键 词：内部缺陷 仿真 形状比 裂纹扩展 疲劳寿命 

分 类 号：TG407[金属学及工艺—焊接]