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Title:Calculation of constitutive potential of isostatic powder compaction
Author(s):Subramanian, Sankara J.; Sofronis, Petros
Constitutive Law
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.
Issue Date:2001-06
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 971
Genre:Technical Report
Sponsor:Department of Energy
Rights Information:Copyright 2001 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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