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

LIU Shaoqing; WANG Haoyu; QIAN Hongliang; CHEN Zhihao; LIU Yizhou; WANG Ping

doi:10.7512/j.issn.1001-2303.2024.08.12

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Analysis of Internal Defect Propagation Behavior of Aluminum Alloy Double-sided Welding Butt Joint
Vol. 54, Issue 8, Pages: 90-95(2024)
Published： 25 August 2024 ，
DOI： 10.7512/j.issn.1001-2303.2024.08.12
稿件说明：

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刘韶庆，王皓宇，钱宏亮，等.铝合金双面焊对接接头内部缺陷扩展行为分析［J］.电焊机，2024，54（8）：90-95.

LIU Shaoqing, WANG Haoyu, QIAN Hongliang, et al.Analysis of Internal Defect Propagation Behavior of Aluminum Alloy Double-sided Welding Butt Joint[J].Electric Welding Machine, 2024, 54(8): 90-95.
刘韶庆，王皓宇，钱宏亮，等.铝合金双面焊对接接头内部缺陷扩展行为分析［J］.电焊机，2024，54（8）：90-95. DOI： 10.7512/j.issn.1001-2303.2024.08.12.

LIU Shaoqing, WANG Haoyu, QIAN Hongliang, et al.Analysis of Internal Defect Propagation Behavior of Aluminum Alloy Double-sided Welding Butt Joint[J].Electric Welding Machine, 2024, 54(8): 90-95. DOI： 10.7512/j.issn.1001-2303.2024.08.12.

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

下裂纹尖端应力强度因子

及疲劳寿命

，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

/长度2

）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

不变而长度2

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，

的比值逐渐趋近于1，即形状趋近于圆形。

Abstract

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

and fatigue life

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

/ length 2

) 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 2

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

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

Keywords

internal defectssimulationshape ratioscrack propagationfatigue life

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