Interaction effect of adjacent small defects on the fatigue limit of a medium carbon steel

M. Åman, S. Okazaki, H. Matsunaga, G. B. Marquis, H. Remes

研究成果: ジャーナルへの寄稿学術誌査読

21 被引用数 (Scopus)

抄録

Structural steels contain various material irregularities and natural defects which 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, was 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 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 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.

本文言語英語
ページ(範囲)130-144
ページ数15
ジャーナルFatigue and Fracture of Engineering Materials and Structures
40
1
DOI
出版ステータス出版済み - 1月 1 2017

!!!All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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