Modeling of shear instabilities observed in cylinder collapse experiments performed on ceramic powders

H. D. Espinosa*, B. A. Gailly

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Brittle materials fail by microcracking and fragmentation when subjected to multiaxial loading. In some cases full comminution occurs and the material behavior becomes governed by the flow of particles. In this work a granular model developed by Anand and co-workers, based on a two-mechanism elastoplastic formulation, is extended to include rate effects and incompressibility at zero void ratio. The model parameters for Alumina and Silicon Carbide ceramic powders are identified using stress histories obtained by means of pressure-shear plate impact experiments. The model is then used to simulate the shear banding mechanism experimentally observed in thick-wall cylinder collapse experiments performed on ceramic powders (Nesterenko and co-workers). The proposed model captures the main physics of the problem and provides valuable insight in the deformation process. Initiation site and speed of propagating instabilities are obtained from the simulations.

Original languageEnglish (US)
Pages (from-to)4135-4147
Number of pages13
JournalActa Materialia
Volume49
Issue number19
DOIs
StatePublished - Nov 14 2001

Keywords

  • Ceramics
  • Constitutive equations
  • Granular
  • Internal friction
  • Powder consolidation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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