Numerical observations of scaling laws in the consolidation of powder compacts

A. Casagranda, P. Sofronis

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Powder consolidation under load is a common means of forming ceramic or intermetallic components for advanced structural applications. Micrometer/nanometer-sized powders are being used as a means for creating new composite microstructures on a fine scale. In addition, powders of this size provide advantages, in general, for powder processing in terms of reduced processing pressures/temperatures and additional control over the final microstructure. However, current models of the deformation processes in powders do not adequately represent the experimental observations in micrometer/nanometer-sized powder compacts. In this paper, a constitutive model for the consolidation of these powders is proposed. The mechanisms considered include elasticity of the aggregate, diffusion along the interparticle contact area, and relative slip between the particles. The finite element method is used to predict the deformation of a powder compact for a range of loading conditions. A cubic array of cylinders is used to model the compact in a two-dimensional (2D) plane strain situation. Unit cell calculations are performed and scaling laws for the macroscopic response during the deformation of the powder aggregate are detected in the numerical results.

Original languageEnglish
Pages (from-to)4835-4845
Number of pages11
JournalActa Materialia
Volume45
Issue number11
DOIs
Publication statusPublished - Nov 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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