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Grain boundary influence on short fatigue crack growth rate

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Author

Summary, in English

The influence from different grain boundary configurations on the crack growth rate of a microstructurally short edge crack, located within one grain and subjected to remote fatigue loading, is studied. The study is performed using a dislocation formulation, were the geometry is described by dislocation dipole elements in a boundary element approach and the plasticity by discrete dislocations, located along specific slip planes in the material. Plane strain and quasi-static conditions are assumed. The crack is assumed to grow in a single shear mechanism due to nucleation, glide and annihilation of discrete dislocations. Different grain boundary configurations in front of the growing crack are considered, including both high angle and low angle grain boundaries. It is shown that both grain boundary configuration and distance between the crack and a grain boundary has a pronounced influence on the crack growth rate.

Department/s

Publishing year

2010

Language

English

Pages

199-210

Publication/Series

International Journal of Fracture

Volume

165

Issue

2

Document type

Journal article

Publisher

Springer

Topic

  • Applied Mechanics

Keywords

  • short crack
  • fatigue
  • grain boundary
  • crack growth rate

Conference name

2nd Broberg Memorial Symposium 2009

Conference date

2009-05-25 - 2009-05-26

Conference place

Lund, Sweden

Status

Published

ISBN/ISSN/Other

  • ISSN: 0376-9429