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Dislocation-based modelling of the growth of a micro structurally short crack by single shear due to fatigue loading

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Author

Summary, in English

The growth of a short edge crack, located within one grain in a bcc crystal and subjected to cyclic loading, is modelled using a dislocation formulation. The external boundary including the crack itself is built from dislocation dipole elements and the plasticity is represented by discrete dislocations moving along preferred slip planes. The crack propagates by single shear due to emission and annihilation of dislocations, leading to a zigzag shaped crack path. The method allows simulation of the crack growth path, crack shape and the development of the plastic zone in detail. It is shown that the grain orientation, orientation of the activated slip systems, the load and the initial crack configuration all together determines the exact path.

Department/s

Publishing year

2005

Language

English

Pages

347-356

Publication/Series

International Journal of Fatigue

Volume

27

Issue

4

Document type

Journal article

Publisher

Elsevier

Topic

  • Applied Mechanics

Keywords

  • single shear
  • dislocation dipole
  • short crack
  • discrete dislocation
  • stage I fatigue

Status

Published

ISBN/ISSN/Other

  • ISSN: 1879-3452