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Computationally efficient modelling of short fatigue crack growth using dislocation formulations

✍ Scribed by P. Hansson; S. Melin; C. Persson

Publisher: Elsevier Science
Year: 2008
Tongue: English
Weight: 312 KB
Volume: 75
Category: Article
ISSN: 0013-7944
DOI: 10.1016/j.engfracmech.2007.12.002

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The influence on the crack growth rate for a short edge crack under fatigue loading due to changes in crack length, grain size, load range and grain boundary configuration, is investigated under quasi-static and plane strain conditions. The geometry is modelled by distributed dislocation dipole elem

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G0/ . Since the value of the ledge force can be neglected as compared with the other two forces in (I), we get ~c = [ b / ~( 1 -v 2 ) ] ~2 / K I 2 ( 2 )

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We express our appreciation to Dr. Yokobori for his interest in our paper [l] and for bringing to our attention their earlier paper [2] on dislocation dynamics theory for fatigue crack growth. The discussion of our paper centers on two points, namely that the dislocation models in [I] and [2] are es