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

Research output: Contribution to journalArticleResearchpeer-review

External Organisational units

  • Materials Center Leoben Forschungs GmbH
  • Erich Schmid Institute of Materials Science


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 R OL = 2.0 and R OL = 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.


Original languageEnglish
Article number156
Number of pages13
JournalMetals : open access journal
Issue number2
Publication statusPublished - 1 Jan 2019