The effect of porosity and micro-defects on plastically deformed porous materials

Citation
Ag. Mamalis et al., The effect of porosity and micro-defects on plastically deformed porous materials, J MATER PR, 96(1-3), 1999, pp. 117-123
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
ISSN journal
0924-0136 → ACNP
Volume
96
Issue
1-3
Year of publication
1999
Pages
117 - 123
Database
ISI
SICI code
0924-0136(19991101)96:1-3<117:TEOPAM>2.0.ZU;2-G
Abstract
A modified plasticity theory for sintered powder materials, taking into acc ount the real complex state of porosity and micro-defects (cracks, non-meta llic inclusions, etc.) is proposed. Equations for plastic flow were develop ed and methods for calculating the true mechanical properties are suggested . The yield criterion derived, in conjuction with simple uniaxial compressi on tests conducted on specimens of the porous material, may evaluate the re al state of the material porosity related to micro-defects which may consti tute the sources for the initiation and propagation of cracks, even in high compressive stress fields such as those developed in most manufacturing pr ocesses, as well as the formation of new pores during plastic deformation. (C) 1999 Elsevier Science S.A. All rights reserved.