Influence of combined impact and cyclic loading on the overall fatigue life of forged steel, EA4T

A. Malekzadeh, Saeid Hadidimoud, Kh. Farhangdoost

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Abstract

The performance of forged steel, EA4T, used in rail industry, under simulated in service conditions, i.e. combined impact - cyclic loading, was investigated through a comprehensive experimental programme. The standard Paris-Erdogan fatigue design curve parameters, m and C, were calibrated to account for the effect of the impact component of loading. A minimum threshold for impact load component, identified in the experiments, was also incorporated in the proposed empirical model. Comparison with experimental findings indicated that this “modified” Fatigue design curve could predict the fatigue life of pre impact loaded specimens with sufficient accuracy. It was therefore suggested that the modified model may be used as a novel design tool for predicting the overall fatigue life of components made of this material under the specified combined impact and fatigue loading conditions.

Publisher Statement: The final publication is available at Springer via http://dx.doi.org/10.1007/s12206-016-0923-x
Original languageEnglish
Pages (from-to)1097-1103
Number of pages7
JournalJournal of Mechanical Science and Technology
Volume31
Issue number3
DOIs
Publication statusPublished - 23 Mar 2017

Keywords

  • Combined impact-fatigue
  • Impact threshold
  • Modified Paris-Erdogan
  • Forged steel EA4T

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