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The effect of the singularity induced by the free surface on fatigue crack growth in thin structures
- 1.0319017 - ÚFM 2009 RIV CH eng J - Journal Article
Hutař, Pavel - Náhlík, Luboš - Knésl, Zdeněk
The effect of the singularity induced by the free surface on fatigue crack growth in thin structures.
[Vliv singularity indukované volným povrchem na rychlost šíření únavové trhliny v tenkých vzorcích.]
Key Engineering Materials. Roč. 385-387, - (2008), s. 317-320. ISSN 1013-9826.
[International Conference on Fracture and Damage Mechanics /7./. Seoul, 09.09.2008-11.09.2008]
R&D Projects: GA ČR GP106/06/P239; GA ČR GA101/08/1623
Institutional research plan: CEZ:AV0Z20410507
Keywords : Fatigue crack * vertex singularity * thin structures
Subject RIV: JL - Materials Fatigue, Friction Mechanics
In many industrial applications is necessary to predict fatigue lifetime of thin structures, where the stress field near the crack front have a real three-dimensional nature. Due to the existence of vertex singularity in the point where the crack front touching free surface, crack propagation in 3D structures cannot be reduced to a series of plane strain or plane stress problems along the crack front edge. The paper describes the influence of vertex singularity on the distribution of the stresses around the crack front for three-dimensional body. The distribution of the stress singularity through the thickness of the specimen gives us indication of the crack behavior in thin structures. The results contribute to a better understanding of the crack behavior in thin structures, and can help to more reliable estimates of their residual fatigue life.
U mnoha aplikací je nutné predikovat životnost tenkých struktur. Díky existenci rohové singularity má rozdělení napětí v okolí čela trhliny trojdimenzonální charakter. Velikost singularity napětí po čele trhliny nám dává odhad chování trhliny v tenkém vzorku. Velikost singularity se dá dobře korelovat s rychlostí šíření únavové trhliny a pomáhá k přesnějšímu odhadu zbytkové únavové životnosti tenkých těles.
Permanent Link: http://hdl.handle.net/11104/0168285
Number of the records: 1