单元类型对焊接数值计算精度的影响

发布时间：2018-05-24 10:40

  本文选题：数值模拟 + 单元类型　； 参考：《电焊机》2016年11期

【摘要】：焊接数值模拟分析过程中,在保证网格质量的前提下,单元类型及网格类型的选择对计算结果的精确性产生明显影响。以大型有限元分析软件Marc为计算工具,采用四面体网格和六面体网格对平板对接接头进行离散,同时分别采用一阶单元和二阶单元进行分析。结果表明:四种单元类型下的焊接仿真变形趋势与实际焊接变形趋势一致,但是计算结果有较大差异。当焊接方法为MAG焊,网格尺寸为2 mm时,采用六面体8节点单元能较好地模拟焊接结构的变形情况。但是当焊缝位置网格尺寸发生变化时,如何选取单元类型需要进一步的分析。
[Abstract]:In the process of numerical simulation and analysis of welding, the selection of element type and mesh type has a significant effect on the accuracy of the calculation results under the premise of ensuring the quality of the mesh. Using the large finite element analysis software Marc as the calculation tool, tetrahedron mesh and hexahedron mesh are used to discretize the butt joint of the flat plate, and the first order element and the second order element are used for the analysis, respectively. The results show that the trend of simulated welding deformation is the same as that of actual welding, but the calculated results are quite different. When the welding method is MAG welding and the mesh size is 2 mm, the deformation of the welded structure can be well simulated by using the hexahedron 8 node element. However, when the mesh size changes, how to select the element type needs further analysis.
【作者单位】： 江苏徐州工程机械研究院;徐州徐工随车起重机有限公司;南京航空航天大学;
【分类号】：TG404
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本文编号：1928755