Correlations among growth law of small cracks, low-cycle fatigue law and applicability of miner's rule

Y. Murakami, S. Harada, T. Endo, H. Tani-Ishi, Y. Fukushima

研究成果: Contribution to journalArticle査読

47 被引用数 (Scopus)

抄録

The initiation and propagation process of a small crack in low-cycle fatigue of a medium carbon steel is observed in detail by the plastic replica method. It is found that the Manson-Coffin relation is virtually the same as the crack growth law of a small crack; more than 90% (almost 100%) of the fatigue life of plain specimens is occupied by the crack propagation process. From this viewpoint, the ambiguity in the definition of the initiation of "an engineering-size crack" can be removed. The effects of prior fatigue history on the growth rate of a small crack are investigated systematically using special specimens containing an artificial small hole with diameters of 40, 100 and 200 μ m. Prior fatigue history which may be accumulated at the region where a crack will later propagate hardly influences the crack growth rate, i.e. prior fatigue history itself should not be regarded as fatigue damage. This is an essential condition for Miner's rule to apply.

本文言語英語
ページ(範囲)909-924
ページ数16
ジャーナルEngineering Fracture Mechanics
18
5
DOI
出版ステータス出版済み - 1983

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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