| 引用本文: | 王忠雷,赵国群,黄丽丽,马新武.六面体网格体积成形有限元分析关键技术[J].材料科学与工艺,2010,18(4):509-513.DOI:10.11951/j.issn.1005-0299.20100415. |
| WANG Zhong-lei,ZHAO Guo-qun,HUANG Li-li,MA Xin-wu.Key technologies of 3D FEM analysis system for bulk forming with hexahedral mesh[J].Materials Science and Technology,2010,18(4):509-513.DOI:10.11951/j.issn.1005-0299.20100415. |
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| 摘要: |
| 为提高三维体积成形有限元分析软件的计算精度、减少网格数量,基于六面体网格特性研究了六面体网格体积成形有限元分析系统的关键技术,通过对STL文件的索引重构建立了模具实体模型顶点和三角形面片拓扑连接关系,提出了一种局部坐标系建立方法保证触模和对称约束条件的正确施加,给出了相对速度和相对位置两种节点触模判断方法,并提出了调整触模节点位置的最短距离法,与初矢修正法和原长修正法比较,其调整距离短,体积损失小.基于以上技术,开发了基于三维六面体网格的体积成形有限元分析系统,对典型体积成形工艺进行了有限元模拟,并与Deform模拟结果进行对比,二者吻合较好,验证了所建立模型与相应处理技术的可行性. |
| 关键词: 体积成形 有限元方法 三维 六面体网格 |
| DOI：10.11951/j.issn.1005-0299.20100415 |
| 分类号:TG316.8 |
| 基金项目:国家自然科学基金资助项目(50875155) |
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| Key technologies of 3D FEM analysis system for bulk forming with hexahedral mesh |
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WANG Zhong-lei1,2, ZHAO Guo-qun1, HUANG Li-li1, MA Xin-wu1
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1.Engineering Research Center for Mould & Die Technology,Shandong University,Jinan 250061,China;2.Institute of Electrical and Mechanical,Shandong Architectural University,Jinan 250101,China
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| Abstract: |
| To improve the calculation accuracy and reduce the number of mesh,several key technologies were researched about the 3D FEM analysis system for bulk forming using hexahedral mesh based on the characteristics of hexahedral mesh.Through topological reconstruction of STL data,the topological relationship between the vertex and the triangle face of mould solid model was built.A new method of building a local coordinate system is proposed for accurately loading the contact mould and symmetrical constraint conditions.Relative velocity method and relative position method for judging if the free node will touch the mould are proposed respectively.A new method of modifying the position of node touched on the mould is proposed.By this new method,the displacement of node is shortened and the volume loss is reduced compared with the Original Normal Method and the Original Length Method.Based on these key technologies,a 3D FEM analysis system for bulk forming using hexahedral mesh is developed.The feasibility of the established model and key techniques was demonstrated by the simulation of the typical bulk forming process and the comparison with the data obtained by Deform. |
| Key words: bulk forming processes FEM 3D hexahedral mesh |
