| 微镦粗过程晶体塑性模型研究 |
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| 引用本文： | 张丰果,董湘怀,章海明,李河宗. 微镦粗过程晶体塑性模型研究[J]. 塑性工程学报, 2011, 18(3). DOI: 10.3969/j.issn.1007-2012.2011.03.002 |
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| 作者姓名： | 张丰果 董湘怀 章海明 李河宗 |
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| 作者单位： | 上海交通大学国家模具CAD工程研究中心,上海,200030 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 三维Voronoi多面体由于和真实金属的细观结构相似,被用来模拟细观尺度下的微镦粗。该文分别建立了基于Voronoi图原理的光滑模型和粗糙模型,用来表示包含32、128晶粒的圆柱体坯料。光滑模型是Voronoi图的精确实现;粗糙模型则是通过对Voronoi图离散得到的,因此只是Voronoi的近似,但在计算开销方面有优势。对这两种模型建立的圆柱体坯料的微镦粗进行晶体塑性有限元模拟,并比较二者的结果。结果显示,在两种模型中,晶粒的增多减弱了塑性流动的各向异性,也增加了变形抗力。此外,光滑模型中,材料的塑性流动表现出更强的各向异性,其变形抗力要比粗糙模型得到的更小。
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| 关 键 词： | Voronoi多面体 晶体塑性 有限元分析 微镦粗 |
The study of crystal plasticity model in micro-upsetting |
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| ZHANG Feng-guo,DONG Xiang-huai,ZHANG Hai-ming,LI He-zong. The study of crystal plasticity model in micro-upsetting[J]. Journal of Plasticity Engineering, 2011, 18(3). DOI: 10.3969/j.issn.1007-2012.2011.03.002 |
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| Authors: | ZHANG Feng-guo DONG Xiang-huai ZHANG Hai-ming LI He-zong |
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| Affiliation: | ZHANG Feng-guo DONG Xiang-huai ZHANG Hai-ming LI He-zong(National Die & Mold CAD Engineering Research Center,Shanghai Jiaotong University,Shanghai 200030 China) |
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| Abstract: | The three-dimensional Voronoi polyhedron,which is topologically similar to the mesostructure of real metals,has been used to study microupsetting at the mesoscopic-level.The smooth model and coarse model based on the basic principle of Voronoi diagram were established respectively,and applied to represent the cylindrical billet containing 32,128 grains respectively.Smooth model is the exact realization of Voronoi diagram,while coarse model realized by discretizing Voronoi diagram is only an approximation of... |
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| Keywords: | Voronoi polyhedron crystal plasticity finite element analysis micro-upsetting |
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