University of Illinois Urbana-Champaign

Calculation of constitutive potential of isostatic powder compaction

Subramanian, Sankara J.; Sofronis, Petros

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https://hdl.handle.net/2142/112676

Description

Title
Calculation of constitutive potential of isostatic powder compaction
Author(s)
  • Subramanian, Sankara J.
  • Sofronis, Petros
Issue Date
2001-06
Keyword(s)
  • Sintering
  • Constitutive Law
  • Diffusion
  • Creep Deformation
Abstract
A macroscopic constitutive potential has been developed for the deformation of a powder compact of cylindrical particles during pressure sintering. The derivation is based on finite element simulations of the densification process that proceeds under the synergistic action of power-law creep deformation in the particles, evolution of the nonlinearly developing contact area between the particles, and interparticle and pore free-su1face diffusional mass transport. Solution to this initial-boundary value problem provides all necessary information for the calculation of the constitutive potential. The associated constitutive law predicts the densification rate of the powder compact at a given temperature and pressure in terms of material parameters such as creep constants and diffusion coefficients, and reflects the role played in the densification process by various micromechanical features such as the pore surface curvature. The model predictions are compared with existing analytical models for plane strain densification and experimental data from sintering of copper wires by stress-driven grain boundary and curvature-driven pore surface diffusion.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 971
  • 2001-6002A
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112676
Sponsor(s)/Grant Number(s)
Department of Energy
Copyright and License Information
Copyright 2001 Board of Trustees of the University of Illinois

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