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HUTAŘ, P. ŠEVČÍK, M. NÁHLÍK, L. KNÉSL, Z.
Original Title
Fatigue crack shape prediction based on the stress singularity exponent
Type
journal article - other
Language
English
Original Abstract
In many industrial applications it is necessary to predict fatigue lifetime of the 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 touches free surface, crack propagation in 3D structures cannot be reduced to a series of plane strain or plane stress problems along the crack front. The paper describes the influence of the vertex singularity on crack shape for three-dimensional structure. The iterative process for estimation of a real crack front based on a stress singularity exponent is presented. The crack front was approximated by a spline curve. In each node defining the crack front the stress singularity exponent has been estimated and complete crack front shape was found. The methodology presented can help to estimate crack front shape in a linear elastic fracture mechanics framework and estimate fracture parameters of fatigue cracks more accurately.
Keywords
stress singularity exponent; crack front curvature; vertex singularity; free surface effect
Authors
HUTAŘ, P.; ŠEVČÍK, M.; NÁHLÍK, L.; KNÉSL, Z.
RIV year
2012
Released
2. 1. 2012
Publisher
Trans Tech Publications
Location
Switzerland
ISBN
1013-9826
Periodical
Key Engineering Materials (print)
Year of study
488-489
Number
-
State
Swiss Confederation
Pages from
178
Pages to
181
Pages count
4
BibTex
@article{BUT74941, author="Pavel {Hutař} and Martin {Ševčík} and Luboš {Náhlík} and Zdeněk {Knésl}", title="Fatigue crack shape prediction based on the stress singularity exponent", journal="Key Engineering Materials (print)", year="2012", volume="488-489", number="-", pages="178--181", issn="1013-9826" }