The influence of interacting small defects on the fatigue limits of a pure iron and a bearing steel

Mari Åman, Kentaro Wada, Hisao Matsunaga, Heikki Remes, Gary Marquis

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Abstract

This study investigates the effect of interacting small cracks on the fatigue limits of two types of pure iron of varying strengths and of a bearing steel. The experimental results revealed that although the fatigue limits were essentially controlled by the mechanics of interacting cracks, the non-propagating crack features and the severity of crack coalescence varied greatly among the different materials. In addition, it is demonstrated that the material-independent, analytical, interaction-criterion alone is not sufficient to estimate interaction effects in reality. This research shows that the material effect can be considered in terms of hardness and non-propagating crack size.
Original languageEnglish
Article number105560
JournalINTERNATIONAL JOURNAL OF FATIGUE
Volume135
DOIs
Publication statusPublished - 1 Jun 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Fatigue limit
  • small crack
  • Non-propagating crack
  • bearing steel
  • high strength steel
  • defect interaction
  • interaction effect

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