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

Chair of Materials Physics (430)

Research output: Contribution to journal › Article › Research › peer-review

17 Citations (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.

Original language	English
Pages (from-to)	47-52
Number of pages	6
Journal	International Journal of Fatigue
Volume	76.2015
Issue number	July
DOIs	https://doi.org/10.1016/j.ijfatigue.2014.09.018
Publication status	Published - 2 Oct 2014

Keywords

ARMCO iron
Equivalent stress intensity factor
Mixed mode II + III
Small-scale yielding

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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.",

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T1 - Analysis of fatigue crack propagation under mixed mode II + III in ARMCO iron

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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SP - 47

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JO - International Journal of Fatigue

JF - International Journal of Fatigue

IS - July

ER -

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

Abstract

Keywords

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