Effect of residual stresses on interface crack growth by void expansion mechanism

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Abstract

Crack growth along an interface between two adjacent elastic-plastic materials in a layered solid is analysed, using special interface elements to represent the fracture process ahead of the crack-tip. These interface elements account for ductile failure by the nucleation and growth of voids to coalescence. In these elements the stress components normal to the interface and the shear stresses are given by equilibrium with the surrounding material, and the stress component tangential to the interface is determined by the requirement of compatibility with the surrounding material in the tangential direction. It is assumed that the layers are sufficiently thick, so that the plastic regions around the crack-tip are much smaller than the thickness of the nearest layers. The analyses focus on the effect of initial residual stresses in the layered material, or on T-stress components induced during loading. The results show that the value of the T-stress component in the softer material adjacent to the interface crack plays the dominant role, such that a negative value of this stress component gives a significant increase of the interface fracture toughness.
Original languageEnglish
JournalInternational Journal of Fracture
Volume142
Issue number1-2
Pages (from-to)43-50
ISSN0376-9429
DOIs
Publication statusPublished - Nov 2006

Keywords

  • ductile fracture
  • interface crack
  • layered solid
  • T-stress
  • cohesive zone

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