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

In English

Författare

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.

Avdelning/ar

Publiceringsår

2005

Språk

Engelska

Sidor

347-356

Publikation/Tidskrift/Serie

International Journal of Fatigue

Volym

27

Issue

4

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Applied Mechanics

Nyckelord

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

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1879-3452