Dislocation-based gradient elastic fracture mechanics for in-plane analysis of cracks

Mahmoud Mousavi*, Elias C. Aifantis

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

The in-plane classical dislocation-based linear elastic fracture mechanics analysis is extended to the case of strain gradient elasticity. Nonsingular stress and smooth-closure crack profiles are derived. As in the classical treatment, the crack is represented by a distribution of climb edge dislocations (for Mode I) or glide edge dislocations (for mode II). These distributions are determined through the solution of corresponding integral equations based on variationally consistent boundary conditions. An incompatible framework is used and the nonsingular full-field plastic distortion tensor components are calculated. Numerical results and related graphs are provided illustrating the nonsingular behaviour of the stress/strain components and the smooth cusp-like closure of the crack faces at the crack tip. The work provides an alternative approach to celebrated “Barenblatt’s treatment” of cracks, without the introduction of a cohesive zone and related to intermolecular forces ahead of the physical crack tip. It also supplements a recent paper by the authors in which the mode III crack, represented by an array of screw dislocations, was solved within the present gradient elasticity framework.

Original languageEnglish
Pages (from-to)93-110
Number of pages18
JournalInternational Journal of Fracture
Volume202
Issue number1
Early online date4 Aug 2016
DOIs
Publication statusPublished - Nov 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • Crack tip plasticity
  • Gradient elasticity
  • Nonsingular cracks
  • Nonsingular dislocations

Fingerprint Dive into the research topics of 'Dislocation-based gradient elastic fracture mechanics for in-plane analysis of cracks'. Together they form a unique fingerprint.

Cite this