| 超声冲击处理对7A52铝合金焊接应力影响的数值模拟 |
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| 引用本文： | 贾翠玲,陈芙蓉.超声冲击处理对7A52铝合金焊接应力影响的数值模拟[J].焊接学报,2015,36(4):30-33. |
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| 作者姓名： | 贾翠玲 陈芙蓉 |
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| 作者单位： | 内蒙古工业大学材料科学与工程学院, 呼和浩特 010051;内蒙古工业大学工程训练中心, 呼和浩特 010051,内蒙古工业大学材料科学与工程学院, 呼和浩特 010051 |
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| 基金项目： | 国家自然科学基金资助项目(50765003,51165026);内蒙古自治区高等学校科学研究资助项目(NJZY087) |
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| 摘 要： | 利用有限元软件ABAQUS,建立了7A52铝合金双丝MIG焊的热力耦合数值模型,得到焊接残余应力场;随后利用数值传递方法,对焊接接头处进行超声冲击处理,建立焊接和超声冲击处理耦合模型,得到冲击后的残余应力场,分析了冲击前后残余应力分布特点和大小,并且通过改变冲击针移动速度分析其对残余应力的影响规律.旨在探讨超声冲击对7A52铝合金焊接残余应力改善的影响.计算结果表明,超声冲击处理能够显著改善焊缝和热影响区的表面残余应力,且随着冲击移动速度的增加,得到的焊接接头处压应力值逐渐减小.
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| 关 键 词： | 超声冲击 残余应力 数值计算 7A52铝合金 |
| 收稿时间： | 2014/3/11 0:00:00 |
Numerical simulation of influence of ultrasonic impact treatment on welding stress of 7A52 aluminum alloy joint |
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| JIA Cuiling and CHEN Furong.Numerical simulation of influence of ultrasonic impact treatment on welding stress of 7A52 aluminum alloy joint[J].Transactions of The China Welding Institution,2015,36(4):30-33. |
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| Authors: | JIA Cuiling and CHEN Furong |
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| Affiliation: | Institution of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;Engineering Training Center, Inner Mongolia University of Technology, Hohhot 010051, China and Institution of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China |
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| Abstract: | A thermal coupling numerical model was established for double-wire MIG welding of 7A52 aluminum alloy, based on the finite element software ABAQUS, and the welding residual stress field was obtained. A coupling model of ultrasonic impact treatment on the welded joint was built with numerical method and the residual stress field was obtained after ultrasonic impact treatment. The distribution characteristics of residual stress before and after ultrasonic impact and the influence law of residual stress by changing the needle moving speed were analyzed, aiming to study the effect of ultrasonic impact using on residual stress of 7A52 aluminum alloy joint. The simulation results show that the ultrasonic impact treatment could significantly improve the surface residual stress of weld seam and heat-affected zone, and the compressive stress in welded joint decreased with the increase of impact moving speed. |
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| Keywords: | ultrasonic impact residual stress numerical simulation 7A52 aluminum alloy |
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