A study of stresses in powder compacted components during and after ejection

Pia Redanz

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A finite strain finite element method is used to examine the residual stresses in a cup-shaped powder compact. Two rate-independent strain hardening porous material models are used: the combined material model (Fleck, N.A., Kuhn, L.T., McMeeking, R.M., 1992a. J. Mech. Phys. Solids 40 (5), 1139-1162) and a material model which includes the dependency of inter-particle cohesive strength (Fleck, N.A., 1995. J. Mech. Phys. Solids 43, 1409-1431). The residual stress state in the unloaded cup is highly dependent on the compaction process and less dependent on the ejection route. The maximum principal stress plotted during ejection shows that higher stresses are found during the ejection process than those found in the completely unloaded specimen. The degree of inter-particle cohesive strength has hardly any effect on the porosity distributions in the compacts but it has a strong influence on the stress state in the cups before unloading. However, after unloading, the stress states become quite similar in the two types of materials. (C) 2001 Elsevier Science Ltd. All rights reserved.
Original languageEnglish
JournalInternational Journal of Solids and Structures
Issue number5
Pages (from-to)759-775
Publication statusPublished - Feb 2001


  • metal powder
  • compaction
  • residual stresses
  • inter-particle cohesion

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