粉末高速压制成形过程中的应力波分析

王爽; 郑洲顺; 周文

doi:10.7498/aps.60.128101

摘要

应用离散单元法,模拟了粉末高速压制成形过程中的压力传播过程.根据粉末高速压制成形的工艺特性,把一次压制过程分为弹性加载、塑性变形、弹性卸载三个阶段;基于离散单元法的基本理论,分别建立了三个阶段的控制方程;应用PFC2D软件对粉末高速压制过程模腔内部颗粒的运动状态进行了数值模拟,给出了压坯内部的压力分布,得出了实验中无法测量的压坯内部应力传播波形.数值模拟结果显示,压力作用曲线表现出明显的弛豫现象,形成了倾斜度不同的锯齿状加载波形和卸载波形,压坯底层的应力波与实验得到的应力波相符.

关键词:

Abstract

The pressure propagation in high velocity compaction process is simulated based on the discrete element method in this paper. Because the full process is divided into elastic loading, plastic deformation and elastic unloading, the governing equations are established in three stages respectively. With the help of computing software PFC2D, the impacting force through different layers of powders can be obtained, which cannot be observed in experiment. The simulation results show obviously a delay phenomenon and serrate waves with different gradients in loading and unloading processes. Finally, the simulated low-level stress waves are compared with available experimental data, which are consistent with each other.

Keywords:

作者及机构信息

1.
中南大学数学科学与计算技术学院,长沙 410083

基金项目: 国家自然科学基金(批准号: 50874123,51174236)、国家重点基础研究发展计划(批准号: 2011CB606306)和中南大学优秀博士学位论文扶植基金(批准号: 2010YBFZ074)资助的课题.

Authors and contacts

1.
Institute of Mathematical Sciences and Computing Technology, Central South University, Changsha 410083, China

参考文献

[1]	Skoglund P 2001 The International Conference on Power Transmission Components (Ypsilanti: Metal Powder Industries Federation) p16
[2]
[3]	Azhdar B, Stenberg B, Kari L 2006 Polymer Test. 25 114
[4]	Guo S J, Chi Y, Meng F, Yang X 2006 Mater. Sci. Eng. Powder Metall. 11 41 (in Chinese) [果世驹、迟悦、孟飞、杨霞 2006 粉末冶金材料科学与工程 11 41]
[5]
[6]
[7]	Yi M J, Yin H Q, Qu X H, Wang J Z, Yuan X J 2009 Powder Metall. Technol. 27 207 (in Chinese) [易明军、尹海青、曲选辉、王建忠、原现杰 2009 粉末冶金技术 27 207]
[8]
[9]	Sun Q C, Wang G Q 2009 Mechanical Introduction on Granular Materials (Beijing: Science Press) p15 (in Chinese)[孙其诚、王光谦 2009 颗粒物质力学导论 (北京:科学出版社) 第15页]
[10]	Wu C Y, Thornton C, Li L Y 2003 Adv. Powder Technol. 14 435
[11]
[12]	Matuttis H G, Luding S, Herrmann H J 2000 Powder Technol. 109 278
[13]
[14]
[15]	Mindlin R D, Deresiewicz H 1953 J. Appl. Mech. 19 327
[16]
[17]	Wang Y J, Xing J B 1991 Discrete Element Method and Application for Geomechanics (Shenyang: Northeastern University Press) p63 (in Chinese) [王泳嘉、邢纪波 1991 离散单元法及其在岩土力学研究中的应用 (沈阳: 东北工学院出版社) 第63页]
[18]	Azhdar B, Stenberg B, Kari L 2006 Polymer Test. 25 1069
[19]
[20]	Wang J Z, Yin H Q, Qu X H, Johnson J L 2009 Powder Technol. 195 184
[21]
[22]
[23]	Chen Z H 1994 Rare Metal Mater. Eng. 33 2 (in Chinese) [陈振华 1994 稀有金属材料与工程 33 2]

施引文献

[1]	Skoglund P 2001 The International Conference on Power Transmission Components (Ypsilanti: Metal Powder Industries Federation) p16
[2]
[3]	Azhdar B, Stenberg B, Kari L 2006 Polymer Test. 25 114
[4]	Guo S J, Chi Y, Meng F, Yang X 2006 Mater. Sci. Eng. Powder Metall. 11 41 (in Chinese) [果世驹、迟悦、孟飞、杨霞 2006 粉末冶金材料科学与工程 11 41]
[5]
[6]
[7]	Yi M J, Yin H Q, Qu X H, Wang J Z, Yuan X J 2009 Powder Metall. Technol. 27 207 (in Chinese) [易明军、尹海青、曲选辉、王建忠、原现杰 2009 粉末冶金技术 27 207]
[8]
[9]	Sun Q C, Wang G Q 2009 Mechanical Introduction on Granular Materials (Beijing: Science Press) p15 (in Chinese)[孙其诚、王光谦 2009 颗粒物质力学导论 (北京:科学出版社) 第15页]
[10]	Wu C Y, Thornton C, Li L Y 2003 Adv. Powder Technol. 14 435
[11]
[12]	Matuttis H G, Luding S, Herrmann H J 2000 Powder Technol. 109 278
[13]
[14]
[15]	Mindlin R D, Deresiewicz H 1953 J. Appl. Mech. 19 327
[16]
[17]	Wang Y J, Xing J B 1991 Discrete Element Method and Application for Geomechanics (Shenyang: Northeastern University Press) p63 (in Chinese) [王泳嘉、邢纪波 1991 离散单元法及其在岩土力学研究中的应用 (沈阳: 东北工学院出版社) 第63页]
[18]	Azhdar B, Stenberg B, Kari L 2006 Polymer Test. 25 1069
[19]
[20]	Wang J Z, Yin H Q, Qu X H, Johnson J L 2009 Powder Technol. 195 184
[21]
[22]
[23]	Chen Z H 1994 Rare Metal Mater. Eng. 33 2 (in Chinese) [陈振华 1994 稀有金属材料与工程 33 2]

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