A grain boundary damage model for delamination

M. C. Messner, A. J. Beaudoin, R. H. Dodds

Research output: Contribution to journalArticlepeer-review

Abstract

Intergranular failure in metallic materials represents a multiscale damage mechanism: some feature of the material microstructure triggers the separation of grain boundaries on the microscale, but the intergranular fractures develop into long cracks on the macroscale. This work develops a multiscale model of grain boundary damage for modeling intergranular delamination—a failure of one particular family of grain boundaries sharing a common normal direction. The key feature of the model is a physically-consistent and mesh independent, multiscale scheme that homogenizes damage at many grain boundaries on the microscale into a single damage parameter on the macroscale to characterize material failure across a plane. The specific application of the damage framework developed here considers delamination failure in modern Al–Li alloys. However, the framework may be readily applied to other metals or composites and to other non-delamination interface geometries—for example, multiple populations of material interfaces with different geometric characteristics.

Original languageEnglish (US)
Pages (from-to)153-172
Number of pages20
JournalComputational Mechanics
Volume56
Issue number1
DOIs
StatePublished - Jul 25 2015

Keywords

  • Aluminum–lithium
  • Damage
  • Delamination
  • Intergranular
  • Multiscale

ASJC Scopus subject areas

  • Computational Mechanics
  • Ocean Engineering
  • Mechanical Engineering
  • Computational Theory and Mathematics
  • Computational Mathematics
  • Applied Mathematics

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