Detail publikace

Near-threshold propagation of mode II and mode III fatigue cracks in ferrite and austenite

VOJTEK, T. PIPPAN, R. HOHENWARTER, A. HOLÁŇ, L. POKLUDA, J.

Originální název

Near-threshold propagation of mode II and mode III fatigue cracks in ferrite and austenite

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

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

Klíčová slova

effective threshold, shear-mode fatigue cracks, ferrite, austenite, dislocation crack growth models, stereophotogrammetry

Autoři

VOJTEK, T.; PIPPAN, R.; HOHENWARTER, A.; HOLÁŇ, L.; POKLUDA, J.

Rok RIV

2013

Vydáno

1. 7. 2013

Nakladatel

Elsevier

ISSN

1359-6454

Periodikum

Acta materialia

Ročník

61

Číslo

12

Stát

Spojené státy americké

Strany od

4625

Strany do

4635

Strany počet

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"
}