The effect of interacting small defects on the fatigue limit of a medium carbon steel

Mari Åman, Saburo Okazaki, Hisao Matsunaga, Gary B. Marquis, Heikki Remes

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Structural steels contain various material irregularities and natural defects. These cause local stress concentrations, from which fatigue cracks tend to initiate. Two defects in close proximity to each other may affect local stress distributions and thus, begin to interact. In this paper, the effect of interacting small cracks on the fatigue limit is systematically investigated in a medium carbon steel. The growth of interacting cracks, as well as the characteristics of non-propagating cracks and microstructural aspects were closely examined via the plastic replica method. It was found that although the fatigue limit is essentially controlled by the mechanics of interacting cracks, based on their configuration, the local microstructure comprised of ferrite and pearlite has a statistical scatter effect on the behaviour of interacting cracks and non-propagating thresholds. With respect to the fatigue limit, when two defects were in close proximity, they behaved as would a larger single defect. However, with greater spacing between defects, rather than mechanical factors, it is the local microstructure which determines the location and characteristics of non propagating cracks. Copyright (C) 2016 The Authors. Published by Elsevier B.V.

Original languageEnglish
Title of host publication21ST EUROPEAN CONFERENCE ON FRACTURE, (ECF21)
EditorsF Iacoviello, L Susmel, D Firrao, G Ferro
PublisherElsevier Science B.V.
Number of pages8
Publication statusPublished - 2016
MoE publication typeA4 Article in a conference publication
EventEuropean Conference on Fracture - Catania, Italy
Duration: 20 Jun 201624 Jun 2016
Conference number: 21

Publication series

NameProcedia Structural Integrity
ISSN (Print)2452-3216


ConferenceEuropean Conference on Fracture
Abbreviated titleECF


  • small crack
  • interacting cracks
  • interaction effect
  • fatigue limit
  • medium carbon steel
  • non-propagating crack

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