Publication detail
Local Aspects of Shear-mode Crack Propagation in Austenitic Steel
HOLÁŇ, L. POKLUDA, J. SLÁMEČKA, K.
Czech title
Local Aspects of Shear-mode Crack Propagation in Austenitic Steel
English title
Local Aspects of Shear-mode Crack Propagation in Austenitic Steel
Type
conference paper
Language
cs
Original abstract
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. Differences between the mechanisms of crack propagation were assessed by means of the 3D fractographical analysis based 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 KIIth (R = 0.1) were found to be of 3.5 MPam1/2 and KIIIth = 4.7 MPam1/2 According to results of stereophotogrammetrical analysis, however, all investigated shear mode cracks propagated under a local mode I. Therefore, such macroscopically determined values can not be considered to be shear- mode thresholds.
Czech abstract
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. Differences between the mechanisms of crack propagation were assessed by means of the 3D fractographical analysis based 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 KIIth (R = 0.1) were found to be of 3.5 MPam1/2 and KIIIth = 4.7 MPam1/2 According to results of stereophotogrammetrical analysis, however, all investigated shear mode cracks propagated under a local mode I. Therefore, such macroscopically determined values can not be considered to be shear- mode thresholds.
English abstract
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. Differences between the mechanisms of crack propagation were assessed by means of the 3D fractographical analysis based 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 KIIth (R = 0.1) were found to be of 3.5 MPam1/2 and KIIIth = 4.7 MPam1/2 According to results of stereophotogrammetrical analysis, however, all investigated shear mode cracks propagated under a local mode I. Therefore, such macroscopically determined values can not be considered to be shear- mode thresholds.
Keywords in Czech
crack paths, threshold, loading modes
Keywords in English
crack paths, threshold, loading modes
RIV year
2009
Released
01.12.2009
Publisher
ÚFM AVČR
Location
Brno
ISBN
978-80-254-6070-2
Book
Víceúrovňový design pokrokových materiálů 09
Pages from–to
123–130
Pages count
8
BIBTEX
@inproceedings{BUT30313,
author="Libor {Holáň} and Jaroslav {Pokluda} and Karel {Slámečka},
title="Local Aspects of Shear-mode Crack Propagation in Austenitic Steel",
booktitle="Víceúrovňový design pokrokových materiálů 09",
year="2009",
month="December",
pages="123--130",
publisher="ÚFM AVČR",
address="Brno",
isbn="978-80-254-6070-2"
}