Detail publikace
Šíření trhlin v módu II a III v blízkosti prahové hodnoty
HOLÁŇ, L. PIPPAN, R. POKLUDA, J. HORNÍKOVÁ, J. HOHENWARTER, A. SLÁMEČKA, K.
Český název
Šíření trhlin v módu II a III v blízkosti prahové hodnoty
Anglický název
Near-Threshold Propagation of Mode II and Mode III Cracks
Typ
článek ve sborníku ve WoS nebo Scopus
Jazyk
en
Originální abstrakt
Two prototype experiments allowing a simultaneous mode II and mode III fatigue crack propagation in a single specimen are described and the differences in related to growth are discussed. The cylindrical specimens made of austenitic and ferritic steels with circumferential V-notch were prepared. The specially manufactured loading setups enabled to assure a pure remote shear mode II at both the top and the bottom sites of the specimen, whereas a pure mode III operated at front and back sites. Differences between the mechanisms of crack propagation were assessed by means of the 3D fractographical analysis based on the stereophotogrammetry in SEM. The stress intensity factors KII and KIII were determined by a numerical method based on the ANSYS code and compared with asymptotically computed values of KIII. The threshold values \Delta KIIth (R = 0.1) were found to be of 1.2 MPam1/2 in ferrite and of 3.5 MPam1/2 in austenite, whereas \Delta KIIIth=2.0 in ferrite and \Delta KIIIth = 4.7 MPam1/2 in austenite. In both steels, the near-threshold crack growth rate under the mode II was found to be much higher than that under the mode III.
Český abstrakt
Two prototype experiments allowing a simultaneous mode II and mode III fatigue crack propagation in a single specimen are described and the differences in related to growth are discussed. The cylindrical specimens made of austenitic and ferritic steels with circumferential V-notch were prepared. The specially manufactured loading setups enabled to assure a pure remote shear mode II at both the top and the bottom sites of the specimen, whereas a pure mode III operated at front and back sites. Differences between the mechanisms of crack propagation were assessed by means of the 3D fractographical analysis based on the stereophotogrammetry in SEM. The stress intensity factors KII and KIII were determined by a numerical method based on the ANSYS code and compared with asymptotically computed values of KIII. The threshold values \Delta KIIth (R = 0.1) were found to be of 1.2 MPam1/2 in ferrite and of 3.5 MPam1/2 in austenite, whereas \Delta KIIIth=2.0 in ferrite and \Delta KIIIth = 4.7 MPam1/2 in austenite. In both steels, the near-threshold crack growth rate under the mode II was found to be much higher than that under the mode III.
Anglický abstrakt
Two prototype experiments allowing a simultaneous mode II and mode III fatigue crack propagation in a single specimen are described and the differences in related to growth are discussed. The cylindrical specimens made of austenitic and ferritic steels with circumferential V-notch were prepared. The specially manufactured loading setups enabled to assure a pure remote shear mode II at both the top and the bottom sites of the specimen, whereas a pure mode III operated at front and back sites. Differences between the mechanisms of crack propagation were assessed by means of the 3D fractographical analysis based on the stereophotogrammetry in SEM. The stress intensity factors KII and KIII were determined by a numerical method based on the ANSYS code and compared with asymptotically computed values of KIII. The threshold values \Delta KIIth (R = 0.1) were found to be of 1.2 MPam1/2 in ferrite and of 3.5 MPam1/2 in austenite, whereas \Delta KIIIth=2.0 in ferrite and \Delta KIIIth = 4.7 MPam1/2 in austenite. In both steels, the near-threshold crack growth rate under the mode II was found to be much higher than that under the mode III.
Klíčová slova anglicky
crack paths, threshold, fatigue
Rok RIV
2009
Vydáno
01.10.2009
Nakladatel
University of Parma
Místo
Vicenza, Italy
ISBN
0000000000000
Kniha
Crack Paths
Strany od–do
585–592
Počet stran
8
BIBTEX
@inproceedings{BUT30036,
author="Libor {Holáň} and Reinhard {Pippan} and Jaroslav {Pokluda} and Jana {Horníková} and Anton {Hohenwarter} and Karel {Slámečka},
title="Near-Threshold Propagation of Mode II and Mode III Cracks",
booktitle="Crack Paths",
year="2009",
month="October",
pages="585--592",
publisher="University of Parma",
address="Vicenza, Italy",
isbn="0000000000000"
}