Analysis of fatigue crack propagation under mixed mode II + III in ARMCO iron

Tomáš Vojtek; Jaroslav  Pokluda; P. Šandera; J. Horníková; Anton Hohenwarter; Reinhard Pippan

doi:10.1016/j.ijfatigue.2014.09.018

Analysis of fatigue crack propagation under mixed mode II + III in ARMCO iron

Tomáš Vojtek
, Jaroslav Pokluda
, P. Šandera
, J. Horníková
, Anton Hohenwarter
, Reinhard Pippan

Lehrstuhl für Materialphysik (430)

Technische Universität Brünn
Erich-Schmid-Institut für Materialwissenschaft der Österreichischen Akademie der Wissenschaften

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Begutachtung

17 Zitate (Scopus)

Abstract

Near-threshold propagation of shear cracks under mixed-mode II + III loading was investigated in ARMCO iron. Special specimens for simultaneous growth of cracks in II, III and II + III loading modes were employed in these experiments. All experiments were performed under small-scale yielding as verified by both analytical and numerical approaches. The most appropriate description of mixed-mode crack growth was found in terms of Δa/ΔN vs. ΔKeq dependences, where ΔKeq=ΔKII2+β·ΔKIII2 and β = 1.1. Also another mixed-mode criterion based on averaged using weight coefficients revealed to be useful. These analyses revealed that the mode III component of the mixed-mode loading was slightly less efficient for the mixed-mode crack-growth mechanism than that of the mode II which is in agreement with results reported for some other metallic materials.

Originalsprache	Englisch
Seiten (von - bis)	47-52
Seitenumfang	6
Fachzeitschrift	International Journal of Fatigue
Jahrgang	76.2015
Ausgabenummer	July
DOIs	https://doi.org/10.1016/j.ijfatigue.2014.09.018
Publikationsstatus	Veröffentlicht - 2 Okt. 2014

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10.1016/j.ijfatigue.2014.09.018

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title = "Analysis of fatigue crack propagation under mixed mode II + III in ARMCO iron",

abstract = "Near-threshold propagation of shear cracks under mixed-mode II + III loading was investigated in ARMCO iron. Special specimens for simultaneous growth of cracks in II, III and II + III loading modes were employed in these experiments. All experiments were performed under small-scale yielding as verified by both analytical and numerical approaches. The most appropriate description of mixed-mode crack growth was found in terms of Δa/ΔN vs. ΔKeq dependences, where ΔKeq=ΔKII2+β·ΔKIII2 and β = 1.1. Also another mixed-mode criterion based on averaged using weight coefficients revealed to be useful. These analyses revealed that the mode III component of the mixed-mode loading was slightly less efficient for the mixed-mode crack-growth mechanism than that of the mode II which is in agreement with results reported for some other metallic materials.",

keywords = "ARMCO iron, Equivalent stress intensity factor, Mixed mode II + III, Small-scale yielding",

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AU - Vojtek, Tomáš

AU - Pokluda, Jaroslav

AU - Šandera, P.

AU - Horníková, J.

AU - Hohenwarter, Anton

AU - Pippan, Reinhard

PY - 2014/10/2

Y1 - 2014/10/2

N2 - Near-threshold propagation of shear cracks under mixed-mode II + III loading was investigated in ARMCO iron. Special specimens for simultaneous growth of cracks in II, III and II + III loading modes were employed in these experiments. All experiments were performed under small-scale yielding as verified by both analytical and numerical approaches. The most appropriate description of mixed-mode crack growth was found in terms of Δa/ΔN vs. ΔKeq dependences, where ΔKeq=ΔKII2+β·ΔKIII2 and β = 1.1. Also another mixed-mode criterion based on averaged using weight coefficients revealed to be useful. These analyses revealed that the mode III component of the mixed-mode loading was slightly less efficient for the mixed-mode crack-growth mechanism than that of the mode II which is in agreement with results reported for some other metallic materials.

AB - Near-threshold propagation of shear cracks under mixed-mode II + III loading was investigated in ARMCO iron. Special specimens for simultaneous growth of cracks in II, III and II + III loading modes were employed in these experiments. All experiments were performed under small-scale yielding as verified by both analytical and numerical approaches. The most appropriate description of mixed-mode crack growth was found in terms of Δa/ΔN vs. ΔKeq dependences, where ΔKeq=ΔKII2+β·ΔKIII2 and β = 1.1. Also another mixed-mode criterion based on averaged using weight coefficients revealed to be useful. These analyses revealed that the mode III component of the mixed-mode loading was slightly less efficient for the mixed-mode crack-growth mechanism than that of the mode II which is in agreement with results reported for some other metallic materials.

KW - ARMCO iron

KW - Equivalent stress intensity factor

KW - Mixed mode II + III

KW - Small-scale yielding

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