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首页> 外文期刊>Journal of Materials Engineering and Performance >Numerical Simulation of Residual Stresses in Multipass Gas Metal Arc-Welded Joints of Thick Aluminum Alloy Plates
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Numerical Simulation of Residual Stresses in Multipass Gas Metal Arc-Welded Joints of Thick Aluminum Alloy Plates

机译：厚铝合金板多元气体弧焊接头残余应力的数值模拟

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摘要

Numerical simulation was utilized to investigate the residual stresses in the multipass gas metal arc-welded joints of high-strength Al-Zn-Mg alloy plates. In order to elevate the reliability of numerical simulation, the heat source model, parameters characterizing the thermal and mechanical properties, boundary conditions, material constitutive model and finite element meshing were discussed in detail. As a novelty of this paper, the modified Arrhenius constitutive equation of the base material and the filled material was obtained according to the results of high-temperature tensile tests. Distributions of stress on the upper and bottom surface of the joint were obtained based on numerical simulation. Special attention was paid to the evolutions of local residual stress on the bottom surface of the joint, and it's found that residual stresses on the bottom surface of the joint were almost unchanged after the weld seam approached a certain thickness. Blind-hole method and x-ray method were adopted to detect the residual stresses on the surfaces to verify the accuracy of the results obtained by numerical simulation.
机译：利用数值模拟来研究高抗体Al-Zn-Mg合金板的多溴气金属弧焊接头中的残余应力。为了提升数值模拟的可靠性，详细讨论了热源模型，表征热和机械性能，边界条件，材料本构模型和有限元啮合的参数。作为本文的新颖性，根据高温拉伸试验的结果获得基材和填充材料的改进的Arhenius结构型方程。基于数值模拟获得接头的上表面和底表面的应力分布。特别注意关节底表面上的局部残余应力的演变，并发现在焊缝接近一定厚度后，接头的底表面上的残余应力几乎保持不变。采用盲孔法和X射线法检测表面上的残余应力，以验证通过数值模拟获得的结果的精度。

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