University of Illinois Urbana-Champaign

On scaling laws for consolidation of nanocrystalline power compacts

Casagranda, Albert; Sofronis, Petros

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https://hdl.handle.net/2142/112521

Description

Title
On scaling laws for consolidation of nanocrystalline power compacts
Author(s)
  • Casagranda, Albert
  • Sofronis, Petros
Issue Date
1996-04
Keyword(s)
  • Scaling Laws
  • Power Consolidation
Abstract
Powder consolidation under load is a common means of forming ceramic or intermetallic components for advanced structural applications. Nanometer sized powders have recently come into use as a means for creating new composite microstructures at the atomistic 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 nanosized powder compacts. In this paper, a constitutive model for the consolidation of nanosized 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 2-D 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.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 821
  • 1996-6008
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112521
Sponsor(s)/Grant Number(s)
Energy Department 96/04 DE FG 02 91 ER 45439 96/04
Copyright and License Information
Copyright 1996 Board of Trustees of the University of Illinois

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Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
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.