Effects of plastic anisotropy on crack-tip behaviour

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Abstract

For a crack in a homogeneous material the effect of plastic anisotropy on crack-tip blunting and on the near-tip stress and strain fields is analyzed numerically. The full finite strain analyses are carried out for plane strain under small scale yielding conditions, with purely symmetric mode I loading remote from the crack-tip. In cases where the principal axes of the anisotropy are inclined to the plane of the crack it is found that the plastic zones as well as the stress and strain fields just around the blunted tip of the crack become non-symmetric. In these cases the peak strain on the blunted tip occurs off the center line of the crack, thus indicating that the crack may want to grow in a different direction. When the anisotropic axes are parallel to the crack symmetry is retained, but the plastic zones and the near-tip fields still differ from those predicted by standard isotropic plasticity.
Original languageEnglish
JournalInternational Journal of Fracture
Volume117
Issue number4
Pages (from-to)297-312
ISSN0376-9429
DOIs
Publication statusPublished - Oct 2002

Keywords

  • crack-tip blunting
  • finite strain
  • plastic anisotropy

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