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VOJTEK, T. PIPPAN, R. HOHENWARTER, A. HOLÁŇ, L. POKLUDA, J.
Original Title
Near-threshold propagation of mode II and mode III fatigue cracks in ferrite and austenite
Type
journal article in Web of Science
Language
English
Original Abstract
The near-threshold behavior of mode II and mode III long fatigue cracks in ferritic (ARMCO iron) and austenitic (X5CrNi18-10) steel were experimentally studied using various samples specially prepared to obtain the effective threshold values deltaKIIeff,th and deltaKIIIeff,th. In both investigated materials, the effective thresholds for mode III were about 1.7 times higher than those for mode II. 3D topological data obtained by the examination of fracture surfaces using stereophotogrammetry were utilized to identify crack growth micromechanisms. In austenite, mode I branching of both the mode II and mode III cracks started at the very onset of crack growth. On the other hand, all cracks in ferrite propagated in crystallographically-assisted local mixed mode I + II + III with mode II dominance. These experimental results can be understood in terms of crack growth micromechanisms according to a deformation model in ferrite and a decohesion model in austenite. The dissimilarity of growth mechanisms in ferrite and austenite may be attributed to a different number of available slip systems in bcc and fcc metals
Keywords
effective threshold, shear-mode fatigue cracks, ferrite, austenite, dislocation crack growth models, stereophotogrammetry
Authors
VOJTEK, T.; PIPPAN, R.; HOHENWARTER, A.; HOLÁŇ, L.; POKLUDA, J.
RIV year
2013
Released
1. 7. 2013
Publisher
Elsevier
ISBN
1359-6454
Periodical
Acta materialia
Year of study
61
Number
12
State
United States of America
Pages from
4625
Pages to
4635
Pages count
11
BibTex
@article{BUT99307, author="Tomáš {Vojtek} and Reinhard {Pippan} and Anton {Hohenwarter} and Libor {Holáň} and Jaroslav {Pokluda}", title="Near-threshold propagation of mode II and mode III fatigue cracks in ferrite and austenite", journal="Acta materialia", year="2013", volume="61", number="12", pages="4625--4635", doi="10.1016/j.actamat.2013.04.033", issn="1359-6454" }