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Metals 2019, 9(2), 156; https://doi.org/10.3390/met9020156

Retardation of Fatigue Crack Growth in Rotating Bending Specimens with Semi-Elliptical Cracks

1
Department Product Engineering, Montanuniversität Leoben, 8700 Leoben, Austria
2
Materials Center Leoben Forschung GmbH, 8700 Leoben, Austria
3
Erich Schmid Institute of Materials Science, 8700 Leoben, Austria
*
Author to whom correspondence should be addressed.
Received: 15 December 2018 / Revised: 22 January 2019 / Accepted: 26 January 2019 / Published: 1 February 2019
(This article belongs to the Special Issue Fracture, Fatigue and Structural Integrity of Metallic Materials)
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Abstract

This work investigates overload-induced retardation effects for semi-elliptically cracked steel round bars. The specimen geometry equals the shaft area of a 1:3 down-scaled railway axle and the material is extracted from railway axle blanks made of EA4T steel. Rotating bending tests under constant amplitude loading as well as overload tests considering overload ratios of ROL = 2.0 and ROL = 2.5 are conducted. The experimental results are compared to a crack growth assessment based on a modified NASGRO equation as well as the retardation model by Willenborg, Gallagher, and Hughes. The evaluated delay cycle number due to the overload by the experiments and the model shows a sound agreement validating the applicability of the presented approach. View Full-Text
Keywords: fatigue crack growth; overload; retardation; semi-elliptical crack; rotating bending fatigue crack growth; overload; retardation; semi-elliptical crack; rotating bending
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Leitner, M.; Simunek, D.; Maierhofer, J.; Gänser, H.-P.; Pippan, R. Retardation of Fatigue Crack Growth in Rotating Bending Specimens with Semi-Elliptical Cracks. Metals 2019, 9, 156.

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