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铝合金变极性等离子弧焊应力场数值分析

牟取晗, 韩永全, 赵鹏, 董俊慧

牟取晗, 韩永全, 赵鹏, 董俊慧. 铝合金变极性等离子弧焊应力场数值分析[J]. 焊接学报, 2015, 36(11): 97-100.
引用本文: 牟取晗, 韩永全, 赵鹏, 董俊慧. 铝合金变极性等离子弧焊应力场数值分析[J]. 焊接学报, 2015, 36(11): 97-100.
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MOU Quhan, HAN Yongquan, ZHAO Peng, DONG Junhui. Numerical simulation of stress field in variable polarity plasma arc welding of aluminum alloys[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(11): 97-100.
Citation: MOU Quhan, HAN Yongquan, ZHAO Peng, DONG Junhui. Numerical simulation of stress field in variable polarity plasma arc welding of aluminum alloys[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(11): 97-100.
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铝合金变极性等离子弧焊应力场数值分析

  • 内蒙古工业大学 材料成型重点实验室, 呼和浩特 010051

Numerical simulation of stress field in variable polarity plasma arc welding of aluminum alloys

  • Material Forming Key Laboratory, Inner Mongolia University of Technology, Hohhot 010051, China

摘要

    摘要
  • 摘要: 以传热学及热弹塑性有限元分析法为理论基础,利用ANSYS有限元分析软件,对铝合金变极性等离子弧焊接温度场、应力场进行数值模拟. 建立 "高斯+双椭球"热源模型,通过正反极性不同尺度热源模型的循环加载,实现对焊接温度场及其应力场较准确的计算;焊后在焊缝的纵、横方向选取不同的点进行残余应力实际测量. 结果表明,不同路径上焊接残余应力值其分布规律与理论基本相同;实际测量结果同计算结果进行比较,二者数值相差较小,说明数值分析的计算结果具有一定的理论指导意义.
    Abstract: Based on the theory of heat transfer and thermal elastoplastic finite element analysis, temperature field and stress field numerical simulations were calculated by ANSYS FEM software in variable polarity plasma arc welding of aluminum alloys. Combining heat source model which is Gaussian plus double ellipsoid was built. Temperature field and stress field were achieved accurately by loading different-size heat source models in positive and reverse polarity period alternatively. The values of residual stress were measured at different points in longitudinal and transversal directions after welding. The results show that the distribution law of residual stress, which was achieved in different directions on simulation model, was the same with theory analysis and the area of high stress was obviously smaller than that in TIG welding. The difference between actual residual stress and calculating residual stress is small. It proves that the calculation of numerical simulation is of great value on theory.
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  • 收稿日期:  2014-05-27

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