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The effect of free surface on fatigue crack behaviour
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SYSNO ASEP 0319037 Document Type A - Abstract R&D Document Type The record was not marked in the RIV R&D Document Type Není vybrán druh dokumentu Title The effect of free surface on fatigue crack behaviour Title Vliv volného povrchu na chování únavové trhliny Author(s) Hutař, Pavel (UFM-A) RID, ORCID
Náhlík, Luboš (UFM-A) RID, ORCID
Knésl, Zdeněk (UFM-A)Source Title IWCMM18 - 18th International Workshop on Computational Mechanics of Materials. - Beijing : Beijing Institute of Technology, 2008
S. 103-103Number of pages 1 s. Action International Workshop on Computational Mechanics of Materials /18./ Event date 07.10.2008-10.10.2008 VEvent location Beijing Country CN - China Event type WRD Language eng - English Country CN - China Keywords vertex singularity ; fatigue crack ; lifetime estimation Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects GP106/06/P239 GA ČR - Czech Science Foundation (CSF) GA101/08/1623 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20410507 - UFM-A (2005-2011) Annotation The main focus of this work is on numerical investigations of the effect of free surface on fatigue crack behavior. Especially relatively thin structures, where vertex singularities are influenced together, are studied. The singularity exponents in vertex point vary between 0.5(corresponding to) and 0.33(corresponding to). With decrease of the structure thickness vertex singularity exponent increases. For really thin structures (t<1 mm) singular stress field around crack tip have the same manner through the thickness of the structure and stress singularity exponent is roughly constant in the relation with thickness. In the case of Poisson’s ratio higher than 0 the singularity exponent is significantly smaller than 0.5. Decrease of the stress singularity exponent for the same nominal loading leads generally to decrease of the fatigue crack growth rate.The estimated fatigue crack growth rate can help to provide a more reliable estimation of the fatigue life of the thin-walled structures. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2009
Number of the records: 1