DISLOCATION SHIELDING OF FATIGUE CRACKS

Authors
PIPPAN R RIEMELMOSER F
Citation
R. Pippan et F. Riemelmoser, DISLOCATION SHIELDING OF FATIGUE CRACKS, Zeitschrift fur Metallkunde, 86(12), 1995, pp. 823-826
Citations number
19
Categorie Soggetti
Metallurgy & Metallurigical Engineering
Journal title
Zeitschrift fur Metallkunde → ACNP
ISSN journal
00443093
Volume
86
Issue
12
Year of publication
1995
Pages
823 - 826
Database
ISI
SICI code
0044-3093(1995)86:12<823:DSOFC>2.0.ZU;2-P
Abstract
A dislocation in the vicinity of a crack changes the near tip stress f ield (local field) of a crack. This effect is called dislocation shiel ding. The change of the local field during a fatigue cycle is studied for a mode I and III crack. It will be shown that the change of the gl obal crack tip field determines the cyclic plastic deformation of the crack tip and not the local field. Therefore the dislocation shielding of fatigue cracks is an intrinsic mechanism and not an extrinsic one.