Publication detail
Mikromechanisms of fatigue crack propagation under shear modes in austenitic steel
HOLÁŇ, L. POKLUDA, J. PIPPAN, R.
Czech title
Mikromechanismy šíření únavových trhlin ve smykových módech v austenitické oceli
English title
Mikromechanisms of fatigue crack propagation under shear modes in austenitic steel
Type
conference paper
Language
cs
Original abstract
Two experimental arrangements allowing loading of two different cylindrical specimens with circumferential notches were used to measure threshold values of the stress intensity factor range and the near-threshold crack growth rates under shear loading modes II and III. Fatigue cracks under shear mode II were kinked while those under shear mode III were twisted. Therefore, all cracks propagated rather under a pure local mode I. Micromechanisms of crack growths under shear modes II and III were evaluated by means of stereophotogrammetry and optical chromatography. The values of intrinsic thresholds under modes II and III were found to be KII,ith = 2,9 MPa.m1/2 and KIII,ith = 4,0 MPa.m1/2, respectively.
Czech abstract
Two experimental arrangements allowing loading of two different cylindrical specimens with circumferential notches were used to measure threshold values of the stress intensity factor range and the near-threshold crack growth rates under shear loading modes II and III. Fatigue cracks under shear mode II were kinked while those under shear mode III were twisted. Therefore, all cracks propagated rather under a pure local mode I. Micromechanisms of crack growths under shear modes II and III were evaluated by means of stereophotogrammetry and optical chromatography. The values of intrinsic thresholds under modes II and III were found to be KII,ith = 2,9 MPa.m1/2 and KIII,ith = 4,0 MPa.m1/2, respectively.
English abstract
Two experimental arrangements allowing loading of two different cylindrical specimens with circumferential notches were used to measure threshold values of the stress intensity factor range and the near-threshold crack growth rates under shear loading modes II and III. Fatigue cracks under shear mode II were kinked while those under shear mode III were twisted. Therefore, all cracks propagated rather under a pure local mode I. Micromechanisms of crack growths under shear modes II and III were evaluated by means of stereophotogrammetry and optical chromatography. The values of intrinsic thresholds under modes II and III were found to be KII,ith = 2,9 MPa.m1/2 and KIII,ith = 4,0 MPa.m1/2, respectively.
Keywords in Czech
mikromechanismy šíření, smykové módy, prahové hodnoty šíření
Keywords in English
micromechanisms of crack propagation, shear modes, threshold crack growth rate
RIV year
2010
Released
02.12.2010
ISBN
978-80-87434-02-4
Book
Víceúrovňový design pokrokových materiálů 10
Pages from–to
107–114
Pages count
8
BIBTEX
@inproceedings{BUT35346,
author="Libor {Holáň} and Jaroslav {Pokluda} and Reinhard {Pippan},
title="Mikromechanismy šíření únavových trhlin ve smykových módech v austenitické oceli",
booktitle="Víceúrovňový design pokrokových materiálů 10",
year="2010",
month="December",
pages="107--114",
isbn="978-80-87434-02-4"
}