An investigation of contact interactions in powder compaction process through variable friction models

Guner F., SOFUOĞLU H., CORA Ö. N.

TRIBOLOGY INTERNATIONAL, vol.96, pp.1-10, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 96
  • Publication Date: 2016
  • Doi Number: 10.1016/j.triboint.2015.12.016
  • Journal Name: TRIBOLOGY INTERNATIONAL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1-10
  • Keywords: Friction model, Variable friction, Powder compaction, Multi particle finite element modeling, FORMING PROCESSES, SIMULATION, LUBRICATION, COMPRESSION, PARAMETERS, PARTICLE, WORKING, MEDIA
  • Karadeniz Technical University Affiliated: Yes

Abstract

In this study, multiparticle finite element (MPFE) approach was used to analyze contact interactions of spherical copper particles in powder compaction process. To this goal, 74 spherical copper particles of 200 in diameter were modeled as individual elastic-plastic bodies, and randomly filled into a die cavity. Interparticle and die-wall-particle contact interactions were investigated, and coefficients of friction were obtained using variable friction models; Wanheim-Bay's general friction model and Levanov's friction model. Variable friction models were incorporated into FE analyses through user subroutines. It was found that the variation of contact stresses inside the die leads to different contact conditions at different zones. The range of coefficient of friction encountered in the analysis was found to be slightly higher in Levanov's friction model than that for Wanheim-Bay's general friction model. On the other hand, Levanov's model was found to be more appropriate for elevated temperature analyses. (C) 2015 Elsevier Ltd. All rights reserved.