Constitutive modeling of deformation and damage in superplastic materials

M. A. Khaleel, H. M. Zbib, E. A. Nyberg

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

The superplastic deformation and cavitation damage characteristics of a modified aluminum alloy are investigated at a temperature range from 500 to 550°C. The baseline alloy is AA5083. Nominally this alloy contains about 4.5% Mg, 0.8% Mn, 0.2% Cr, 0.037% Si, 0.08% Fe and 0.025% Ti by weight. The experimental program consists of uniaxial tension tests and digital image analysis for measuring cavitation. The experiments reveal that evolution of damage is due to both nucleation and growth of voids. A viscoplastic model for describing deformation and damage in this alloy is developed based on a continuum mechanics framework. The model includes the effect of strain hardening, strain rate sensitivity, dynamic and static recovery, and nucleation and growth of voids. The model predictions compare well with the experimental results.

Original languageEnglish
Pages (from-to)277-296
Number of pages20
JournalInternational Journal of Plasticity
Volume17
Issue number3
DOIs
Publication statusPublished - 26 Feb 2001
Externally publishedYes

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Keywords

  • Aluminium
  • Constitutive equations
  • Damage deformations
  • Superplasticity

ASJC Scopus subject areas

  • Mechanical Engineering

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