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Influence of fatigue load range on the growth of a microstructurally short edge crack simulated by a discrete dislocation formulation

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Author

Summary, in English

Quasistatic propagation of a short edge crack, located within one grain of a bcc material has been studied using a discrete dislocation technique. The geometry is modelled by distributed dislocation dipole elements and the plasticity by discrete dislocations. The crack is assumed to grow through a single shear mechanism due to nucleation and annihilation of dislocations along preferred slip planes in the material. The change in growth rates due to different load cycles and due to a small single overload was investigated. It was found that the growth rates were strongly influenced by the applied load cycles, and that a single overload affects the growth differently depending on the number of cycles prior to the overload. (c) 2005 Elsevier Ltd. All rights reserved.

Department/s

Publishing year

2006

Language

English

Pages

714-721

Publication/Series

International Journal of Fatigue

Volume

28

Issue

7

Document type

Journal article

Publisher

Elsevier

Topic

  • Applied Mechanics

Keywords

  • overload
  • single shear
  • short crack
  • discrete dislocation
  • fatigue

Status

Published

ISBN/ISSN/Other

  • ISSN: 1879-3452