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Modelling And Simulation The Cracking Of Green Metal Powder Body

  • : Pär Jonsén1, Stefan Golling1, Hans-Åke Häggblad1, Gustaf Gustafsson1, Mats Oldenburg1
  • : 1Luleå University of Technology
  • : PDF Download
  • : 2016

Abstract

During the ejection stage of the powder metallurgy (PM) pressing process the elastic behaviour is important. Especially, if the in the powder compact is unloaded in a non-beneficially manner crack formation can occur. Experiments show a non-linear and also stress dependent elastic behaviour of green bodies. Calibrated against experimental data, a fracture model controlling the stress versus crack-width relationship is used. The softening rate of the fracture model is obtained from the corresponding rate of the dissipated energy. The model is implemented with a smeared crack approach in a finite element code and tested in simulation of a diametral compression testing. Results from simulations correlates well with experimental results. The smeared crack method combined with a cohesive fracture model is an interesting tool for predicting fracture in powder compacts.

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