Publication detail
Fatigue crack propagation in thin structures
HUTAŘ, P. SEITL, S. NÁHLÍK, L. KNÉSL, Z.
Czech title
Šíření únavové trhliny v tenkých konstrukcích
English title
Fatigue crack propagation in thin structures
Type
journal article - other
Language
en
Original abstract
The influence of specimen thickness on fatigue crack behaviour has been investigated. To this aim the fatigue crack propagation rate has been measured on two different types of test specimens with varying thickness. The change of stress singularity exponent for the crack front due to vicinity of the free surface is considered. To explain the effect of stress singularity changes on obtained experimental results a methodology based on generalized stress intensity factor and strain energy density concept has been used. It is shown that for materials with Poissons ratio of about 0.3 the free surface effect does not play a decisive role for specimens with a low level of in-plane constraint but can influence fatigue crack propagation rate in the case of geometries with a high level of the constraint.
Czech abstract
V práci je studováno chování únavové trhliny v blízkosti volného povrchu tělesa. Navrženým postupem je možné odhadnout nižší chychlost šíření únavové trhliny v blízkosti volného povrchu jenž vede k typickému zakřivení čela trhliny. Vypočítaná data jsou v dobrém souladu s experimentálními výsledky.
English abstract
The influence of specimen thickness on fatigue crack behaviour has been investigated. To this aim the fatigue crack propagation rate has been measured on two different types of test specimens with varying thickness. The change of stress singularity exponent for the crack front due to vicinity of the free surface is considered. To explain the effect of stress singularity changes on obtained experimental results a methodology based on generalized stress intensity factor and strain energy density concept has been used. It is shown that for materials with Poissons ratio of about 0.3 the free surface effect does not play a decisive role for specimens with a low level of in-plane constraint but can influence fatigue crack propagation rate in the case of geometries with a high level of the constraint.
Keywords in Czech
únavová trhliny, rohová singularita, tenké konstrukce
Keywords in English
Fatigue crack, vertex singularity, thin structures
RIV year
2010
Released
01.10.2010
Publisher
TTP
Location
Švýcarsko
ISSN
1013-9826
Journal
Key Engineering Materials
Volume
417-418
Number
xxx
Pages from–to
257–260
Pages count
4
BIBTEX
@article{BUT50811,
author="Pavel {Hutař} and Stanislav {Seitl} and Luboš {Náhlík} and Zdeněk {Knésl},
title="Fatigue crack propagation in thin structures",
journal="Key Engineering Materials",
year="2010",
volume="417-418",
number="xxx",
month="October",
pages="257--260",
publisher="TTP",
address="Švýcarsko",
issn="1013-9826"
}