网格尺寸对双椭球热源模型作用下焊接温度场计算的影响
Effect of mesh size on weld temperature field of double ellipsoidal power density distribution heat source model
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摘要: 文中以Q345E薄板对接焊焊接过程为研究对象，基于双椭球功率密度分布体热源模型，利用ABAQUS有限元软件建立其1/2模型，通过数值模拟研究了不同网格尺寸对焊接温度场的计算精度和计算效率的影响，结合数值积分计算，分析比较了不同网格尺寸下，理论热输入与实际热输入的差别，提出了适宜的网格尺寸.计算结果表明，随着网格尺寸的不断减小，收敛时间变长，CPU计算时间变长，焊接温度场的最高温度、焊接熔池的宽度和深度减小；当网格尺寸减小至双椭球功率密度分布热源深度方向长度的1/2时，理论热输入与实际热输入偏差较小，得到的焊接温度场最高温度、焊接熔池宽度和深度也趋于恒定.
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关键词:
- 双椭球功率密度分布体热源 /
- 网格尺寸 /
- 焊接温度场 /
- 数值模拟
Abstract: Based on double ellipsoidal power density distribution heat source model, the effect of different mesh sizes on computational accuracy and efficiency of temperature field in Q345E plate butt welding was numerically simulated with ABAQUS finite element software. Combining numerical integral calculation, the difference of heat input between theoretical and actual results was compared, and then a suitable mesh size was proposed. The results show that with the reduction of mesh size, the convergence time and CPU computing time increased, the maximum value of weld temperature field and the width and depth of weld pool decreased. When the mesh size was reduced to 1/2 of length in depth direction of double ellipsoidal model, the difference of heat input between theoretical and actual results was relatively small, and the highest weld temperature and the width and depth of weld pool tended to be constant. -
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