The effect of a low angle grain boundary on the short fatigue crack growth

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The influence on the fatigue crack growth behaviour of a short edge crack due to different configurations of a nearby located low angle grain boundary is investigated under quasi-static and plane strain conditions. The geometry is modelled by dislocation dipole elements in a boundary element approach, and the plasticity is modelled by discrete dislocations. The crack is assumed to grow in a single shear mechanism due to nucleation, glide and annihilation of dislocations in the material. It was found that the sign of the dislocations in the grain boundary, the distances between them and the placement of the dislocations in the grain boundary with respect to preferred slip plane directions, all strongly influenced the growth behaviour.
Original languageEnglish
Pages (from-to)362-365
JournalKey Engineering Materials
Publication statusPublished - 2011
Event6th International Conference on Materials Structure and Micromechanics of Fracture - Brno, Czech Republic
Duration: 2010 Jun 282010 Jun 30

Subject classification (UKÄ)

  • Applied Mechanics


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