| 摘要: |
| 基于有限元软件Abaqus,采用板壳单元对薄板对接焊进行热弹塑性数值模拟. 建立具有截面积分特性的板壳单元二维有限元模型,采用高斯面热源与均匀体热源组合的混合移动热源,考虑材料随温度的变化特性,对薄板的接温度场与变形场进行了计算,并与相当网格尺寸的三维实体单元计算结果进行了对比. 结果表明,板壳单元与实体单元计算所得温度场与变形结果比较一致;采用非均匀板厚模拟加强高的板壳单元能够进一步改进焊接变形预测结果;在保证计算精度的条件下,板壳单元比实体单元具有更高的计算效率,计算结果为改进大型结构焊接变形预测方法提供了参考意义. |
| 关键词: 板壳单元 热弹塑性有限元 焊接变形 数值模拟 |
| DOI：10.12073/j.hjxb.20150924 |
| 分类号: |
| 基金项目: |
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| Application of 3D shell element in welding thermal elastic-plastic finite element analysis |
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TIAN Peng, CHEN Zhen
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School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China
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| Abstract: |
| Based on Abaqus code, shell elements with section integration were used to conduct the thermal elastic-plastic numerical simulation of butt-welded plate. A 2D shell model was established, and a mixed moving heat source comprised of uniform body and Gauss surface flux was adopted to describe the distribution of input energy. The material physical properties, including specific heat and conductive coefficient, were temperature dependent. The results show that the temperature and deformation during welding process were in good agreement with those by 3D solid model, and the shell model with nonuniform thickness considering the effect of weld fillet could enhance the deformation result further. Compared with solid elements, the shell model could obtain the same calculation accuracy and work more efficiently. |
| Key words: shell element thermal elastic-plastic analysis welding deformation numerical simulation |
