A homogenization approach to the yield strength of spherical powder compacts

A. Benabbes*, L. Siad, L. Dormieux, W. K. Liu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Optimal external estimates of the macroscopic strength criteria of a hexagonal array of identical spherical grains, under isostatic and closed die compaction, have been obtained through the use of the kinematic approach of the yield design homogenization method. Two appropriate unit cells, one for each stage compaction (I and II), and eight relevant failure mechanisms are considered. For comparison purposes, numerical simulations based on FEA similar to those of Ogbana and Fleck [1] have also been carried out. The shapes and sizes of the macroscopic yield surfaces are determined at various stages of compaction and it has been found in particular that they depend upon the loading history as well as the relative density of the compact.

Original languageEnglish (US)
Title of host publicationNUMIFORM 2010 - Proceedings of the 10th International Conference on Numerical Methods in Industrial Forming Processes Dedicated to Professor O. C. Zienkiewicz (1921-2009), Volume 1 and 2
Pages681-688
Number of pages8
DOIs
StatePublished - 2010
Event10th International Conference on Numerical Methods in Industrial Forming Processes Dedicated to Professor O. C. Zienkiewicz (1921-2009), NUMIFORM 2010 - Pohang, Korea, Republic of
Duration: Jun 13 2010Jun 17 2010

Publication series

NameAIP Conference Proceedings
Volume1252
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other10th International Conference on Numerical Methods in Industrial Forming Processes Dedicated to Professor O. C. Zienkiewicz (1921-2009), NUMIFORM 2010
CountryKorea, Republic of
CityPohang
Period6/13/106/17/10

Keywords

  • FE simulations
  • Failure mechanism
  • macroscopic yield surface
  • powder compaction
  • unit cell
  • upper bound
  • yield design homogenization method
  • yield probing technique

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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