| 金属粉末轧制的力学模型及数值模拟研究 |
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| 引用本文： | 刘明俊,刘白.金属粉末轧制的力学模型及数值模拟研究[J].深圳信息职业技术学院学报,2014(3):71-76. |
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| 作者姓名： | 刘明俊 刘白 |
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| 作者单位： | 深圳信息职业技术学院机电工程学院,广东深圳,518172 |
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| 基金项目： | 广东省自然科学基金面上项目，深圳市科技计划项目 |
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| 摘 要： | 金属粉末轧制工艺能够生产一般工艺难于或无法生产且成分精确、性能优良的板带材，是制取高性能以及特殊用途材料的粉末冶金成形工艺。在粉末轧制工艺的力学行为研究中，传统的数学模型被证明所提供的作用有限，基于有限元方法的数值模拟为此提供了一种灵活高效的途径。基于把粉末体看作是可压缩连续体的假设，根据椭球面屈服准则推导了金属粉末体变形的弹塑性本构关系。采用了合适的本构关系积分算法，并对摩擦模型进行了分析。基于MSC．Marc平台的二次开发工具编制了相关的用户子程序，对铁基粉末的轧制过程进行了三维弹塑性有限元数值模拟。该程序的准确性已在对粉末闭模压制的数值模拟及实验对比中得到了验证。此外，分析了轧制速度、摩擦系数等对轧制力和相对密度分布的影响。
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| 关 键 词： | 粉末轧制 有限元方法 本构关系 椭球面屈服准则 |
Mechanical models and numerical simulations on metal rolling compaction |
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| LIU Mingjun,LIU Bai.Mechanical models and numerical simulations on metal rolling compaction[J].Journal of Shenzhen Institute of Information Technology,2014(3):71-76. |
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| Authors: | LIU Mingjun LIU Bai |
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| Institution: | (School of Michanical and Electrical Engineering, Shenzhen Institute of Information Technology, Shenzhen, 518172, P,R. China) |
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| Abstract: | In spite of its simplicity and low cost, the rolling compaction process can produce strips or plates with homogeneous and satisfactory mechanical properties. The mechanical behaviors of rolling compaction are difficult to predict accurately by traditional means. The Finite Element Method （FEM） provides an efficient approach for such problems. Based on the assumption that the powder system is a compressive continuous material, three-dimensional FEM simulations for the rolling compaction process of the iron matrix powder were proposed. The ellipsoidal yield criterion was analyzed. The correspondent elasto-plastic constitutive relationship was derived from the yield criterion. Appropriate integration algorithm and friction model were applied. The user subroutine was developed and three- dimensional simulations were performed in MSC.Marc. Effects of friction coefficient and rolling velocity of the rollers on the rolling force and the distribution of the relative density were analyzed. |
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| Keywords: | rolling compaction Finite Element Method (FEM) constitutive relationship ellipsoidal yield criterion |
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