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Influence from geometrical features on the growth rate of a micro-structurally short fatigue crack

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Author

Summary, in English

The influence on the crack growth rate on a micro-structurally short edge crack subjected to fatigue loading from changes in crack length, distance to grain boundaries and applied load has been investigated. The crack is assumed to grow in a single shear mechanism due to nucleation, glide and annihilation of dislocations along preferred slip planes in the material. The external geometry is modelled by distributed dislocation dipole elements in a boundary element approach under quasi-static and plane strain conditions. The evolving plasticity is described by individual discrete dislocations along a slip plane emanating from the crack in the crack direction. The crack growth rate is shown to be controlled by the plasticity, which in turn is controlled by geometrical parameters in combination with the external load. (C) 2010 Elsevier Ltd. All rights reserved.

Department/s

Publishing year

2010

Language

English

Pages

1907-1913

Publication/Series

Engineering Fracture Mechanics

Volume

77

Issue

11

Document type

Journal article

Publisher

Elsevier

Topic

  • Applied Mechanics

Keywords

  • Grain
  • Crack growth rate
  • Short fatigue crack
  • Discrete dislocations
  • boundary

Conference name

3rd International Conference on Crack Paths, 2009

Conference date

2009-09-23 - 2009-09-25

Conference place

Venice, Italy

Status

Published

ISBN/ISSN/Other

  • ISSN: 1873-7315