The compaction of a random distribution of metal cylinders by the discrete element method

被引:61
作者
Redanz, P [1 ]
Fleck, NA
机构
[1] Tech Univ Denmark, Dept Mech Engn, DK-2800 Lyngby, Denmark
[2] Univ Cambridge, Dept Engn, Cambridge CB2 1PZ, England
关键词
powder consolidation; metals;
D O I
10.1016/S1359-6454(01)00298-1
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The cold compaction of a 2D random distribution of metal circular cylinders has been investigated numerically by the discrete element method. Each cylindrical particle is located by a node at its centre and the plastic indentation of the contacts between neighbouring particles is represented by non-linear springs. The initial packing of the particles is generated by the ballistic deposition method. Salient micromechanical features of closed die and isostatic powder compaction are elucidated for both frictionless and sticking contacts. It is found that substantial rearrangement of frictionless particles takes place. leading to yield surfaces of similar shape but about half the size of that found for affine motion, as reported in [J. Mech. Phys. Solids 40 (1992) 1139 43 (1995) 1409; 47 (1999) 785]. An increase in the level of inter-particle friction leads to a reduction in the degree of local particle rearrangement: the relative displacement of particle centres in the network is more closely represented by affine motion for the case of sticking contacts than frictionless contacts. The discrete element calculations suggest that the yield surfaces for sticking contacts are similar in shape to those for frictionless particles, but are about double the size. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:4325 / 4335
页数:11
相关论文
共 20 条
[11]   Cold plastic compaction of powders by a network model [J].
Heyliger, PR ;
McMeeking, RM .
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, 2001, 49 (09) :2031-2054
[12]   Analysis for cold die compaction of stainless-steel powder [J].
Kwon, YS ;
Lee, HT ;
Kim, KT .
JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME, 1997, 119 (04) :366-373
[13]  
NEWELL KJ, 1995, THESIS U CALIFORNIA
[14]   A network model for initial stage sintering [J].
Parhami, F ;
McMeeking, RM .
MECHANICS OF MATERIALS, 1998, 27 (02) :111-124
[15]   Numerical modelling of the powder compaction of a cup [J].
Redanz, P .
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS, 1999, 18 (03) :399-413
[16]   A study of stresses in powder compacted components during and after ejection [J].
Redanz, P .
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, 2001, 38 (05) :759-775
[17]  
RIEDEL H, 1993, INT J REFRACT MET H, V12, P55
[18]   Cold compaction of an array of cylindrical fibres [J].
Sridhar, I ;
Fleck, NA ;
Akisanya, AR .
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, 2001, 43 (03) :715-742
[19]   The visco-plastic compaction of composite powders [J].
Storåkers, B ;
Fleck, NA ;
McMeeking, RM .
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, 1999, 47 (04) :785-815
[20]   RANDOM PACKING OF EQUAL AND UNEQUAL SPHERES IN 2 AND 3 DIMENSIONS [J].
VISSCHER, WM ;
BOLSTERL.M .
NATURE, 1972, 239 (5374) :504-&