| 冷模压制Ti-6Al-4V粉末的修正Drucker-Prager Cap本构模型 |
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| 引用本文： | 孙世民,黄尚宇,周梦成,雷雨,王斌. 冷模压制Ti-6Al-4V粉末的修正Drucker-Prager Cap本构模型[J]. 粉末冶金技术, 2018, 36(4): 261-269. DOI: 10.19591/j.cnki.cn11-1974/tf.2018.04.004 |
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| 作者姓名： | 孙世民 黄尚宇 周梦成 雷雨 王斌 |
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| 作者单位： | 武汉理工大学材料科学与工程学院, 武汉 430070 |
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| 基金项目： | 国家自然科学基金资助项目51475345 |
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| 摘 要： | 通过单轴压缩实验、径向压缩（巴西圆盘）实验和冷模模压实验建立了基于密度相关修正Drucker-Prager Cap（DPC）的Ti-6Al-4V粉末压制本构模型，利用ABAQUS有限元仿真软件的二次开发用户子程序USDFLD对该本构模型进行了模拟验证。综合考虑压制过程中实验装置变形对实验数据的影响，通过空压校正实验控制实验误差，建立了更加准确的修正DPC模型。结果表明:修正DPC本构模型可很好地应用于Ti-6Al-4V粉末压制过程的仿真模拟；当上模冲压力较小时（< 50 MPa），模壁摩擦系数随上模冲压力的增加逐渐减小，当上模冲压力较大时（>50 MPa），模壁摩擦系数随上模冲压力的增加而基本趋于稳定。
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| 关 键 词： | Ti-6Al-4V粉末 Drucker-Prager Cap模型 粉末压制 数值模拟 |
| 收稿时间： | 2018-01-15 |
Modified Drucker-Prager Cap model of Ti-6Al-4V powders for cold die compaction |
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| Affiliation: | School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China |
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| Abstract: | The density-dependent modified Drucker-Prager Cap (DPC) constitutive model of Ti-6Al-4V powders for cold die compaction was established by uniaxial compression test, diametrical compression test (Brazilian disc experiment), and die compression test in this paper, the constitutive model was verified by the user subroutine USDFLD in secondary development based on finite element software ABAQUS. Considering the influence of device deformation on experimental data in compaction process, the experimental error was controlled by calibration experiment, and the more accurate modified DPC model was established. The results show that, the modified DPC model of Ti-6Al-4V powders for cold die compaction can be accurately used in the simulation analysis of Ti-6Al-4V powders compaction. In addition, the wall friction decreases gradually with the increase of the top punch pressure when the top punch pressure is lower than 50 MPa; while the wall friction tends to be stable with the increase of the top punch pressure, when the top punch pressure is higher than 50 MPa. |
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