Publication detail
K-calibration of Special Specimens for Mode II, III and II+III Crack Growth
HORNÍKOVÁ, J. ŽÁK, S. ŠANDERA, P.
Czech title
K-kalibrace speciálních vzorků pro růst trhlin v módech II, III a II+III
English title
K-calibration of Special Specimens for Mode II, III and II+III Crack Growth
Type
journal article in Web of Science
Language
en
Original abstract
An original testing setup has been designed for generating pure remote mode II, III and mixed mode II + III crack propagation in a single cylindrical specimen with circumferential crack. This specimen is currently used for investigations of a shear mode fatigue crack propagation. The aim of this work was to perform the K-calibration of above mentioned specimens that will be used for a description of stability and growth of shear-mode fatigue cracks in the near-threshold region. Two-step submodelling based on the ANSYS code was performed in order to obtain sufficiently precise values of the stress intensity factors KII, KIII and KII,III along the crack front of small and large samples. The shape functions FII, FIII and FII,III were determined using the J-integral concept. The calculated values of the KIII factors could be, unlike those of KII factors, nearly compared with the solution based on an asymptotic approximation available in the literature. Calculations revealed that, for small gripping distances, the shape functions FII and FIII depend on the experimental adjustment of the gripping distance.
Czech abstract
Původní testovací zařízení bylo navrženo tak, aby se u válcového vzorku s obvodovou trhlinou tato trhlina šířila pouze v módech II, III a ve smíšeném módu II + III. Tento vzorek je v současné době užíván pro vyšetřování šíření únavových trhlin ve smykovém módu. Cílem této práce bylo provést K-kalibraci výše uvedených vzorků, které budou použity k popisu stability a růstu smykových únavových trhlin v prahové oblasti. Bylo použito dvoustupňové modelování v programovém prostředí ANSYS, aby byly s dostatečnou přesností určeny součinitelé intenzity napětí KII, KIII a KII,III podél čela trhliny na malých a velkých vzorcích. Tvarové funkce FII, FIII a F II,III byly stanoveny pomocí koncepce J-integrálu. Vypočtené hodnoty součinitelů KIII mohly být, na rozdíl od součinitelů KII, porovnány s řešením založeným na asymptotické aproximaci, které je dostupné v literatuře. Výpočty bylo zjištěno, že pro malé vzdálenosti uchycení závisí tvarové funkce FII a FIII na přesnosti uchycení při experimentu.
English abstract
An original testing setup has been designed for generating pure remote mode II, III and mixed mode II + III crack propagation in a single cylindrical specimen with circumferential crack. This specimen is currently used for investigations of a shear mode fatigue crack propagation. The aim of this work was to perform the K-calibration of above mentioned specimens that will be used for a description of stability and growth of shear-mode fatigue cracks in the near-threshold region. Two-step submodelling based on the ANSYS code was performed in order to obtain sufficiently precise values of the stress intensity factors KII, KIII and KII,III along the crack front of small and large samples. The shape functions FII, FIII and FII,III were determined using the J-integral concept. The calculated values of the KIII factors could be, unlike those of KII factors, nearly compared with the solution based on an asymptotic approximation available in the literature. Calculations revealed that, for small gripping distances, the shape functions FII and FIII depend on the experimental adjustment of the gripping distance.
Keywords in English
Stress intensity factor; Shear loading mode; Fatigue crack propagation; Finite element method; Submodelling
RIV year
2013
Released
01.09.2013
Publisher
Elsevier
Location
USA
ISSN
0013-7944
Volume
110
Number
1
Pages from–to
430–437
Pages count
8
BIBTEX
@article{BUT102128,
author="Jana {Horníková} and Stanislav {Žák} and Pavel {Šandera},
title="K-calibration of Special Specimens for Mode II, III and II+III Crack Growth",
year="2013",
volume="110",
number="1",
month="September",
pages="430--437",
publisher="Elsevier",
address="USA",
issn="0013-7944"
}