کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
781540 | 1463825 | 2009 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Crack growth rates for short fatigue cracks simulated using a discrete dislocation technique Crack growth rates for short fatigue cracks simulated using a discrete dislocation technique](/preview/png/781540.png)
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 elements in a boundary element method approach and the plasticity is described by discrete dislocations. The crack is assumed to grow due to nucleation, glide and annihilation of dislocations along slip planes in the material in a single shear mechanism. The results of the investigation are compared to typical growth rates for long cracks and it is found that the increase in growth rate due to a prescribed stress intensity factor range was much less pronounced as compared to what holds for long cracks.
Journal: International Journal of Fatigue - Volume 31, Issues 8–9, August–September 2009, Pages 1346–1355