Fatigue Fracture of a High-Resistance Structural Steel Component Destined to Sustain Severe Loads Under Service Conditions

S. Papaefthymiou, A. Vazdirvanidis, G. Pantazopoulos*, C. Goulas

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)

Abstract

A structural steel component that failed under fatigue was examined with the aim to identify the root causes of this failure. Fractographic examination revealed the presence of multiple beach marks; the position and arrangement of those signified the occurrence of fatigue fracture under the presence of combined loading conditions, involving torsion and bending stress components. Crack initiation was observed also at the corners of the steel plate where non-metallic inclusions were located. Stereo-microscopical examination of the fracture surface likely revealed the presence of casting inclusions, probably fluxes or slag particles, near the surface and in the interior of the component. These inclusions could be considered inherent—metallurgical stress raisers, behaving as locations of prominent crack nucleation under cyclic fatigue loading, stimulating subsequent crack propagation and final ultimate rupture.

Original languageEnglish
Pages (from-to)79-85
Number of pages7
JournalJournal of Failure Analysis and Prevention
Volume17
Issue number1
Early online date7 Dec 2016
DOIs
Publication statusPublished - 1 Feb 2017
Externally publishedYes

Keywords

  • Failure analysis
  • Fatigue fracture
  • Fractography
  • Microstructure characterization

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