Low-Cycle Fatigue of a Medium Carbon Steel under Variable Strain Cycling (Application of the Rain Flow Method to the Prediction of Microcrack Propagation Life)

Tatsuo Endo, Shoji Harada, Kazuyuki Takeshima, Yoshihiro Fukushima

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)

抄録

The rain flow method for counting fatigue damage was applied to predict microcrack propagation life under varying strain amplitudes. Low-cycle fatigue tests were conducted on a medium carbon steel under block-random and pseudo-random strain cycling as well as constant strain cycling. Through continual observation of the microcrack initiation and propagation behaviours of plain specimens and holed specimens with a small drilled hole, the results obtained are summarized as follows : (1) For a microcrack propagating under varying strain amplitudes, a fatigue damage calculated by means of the rain flow method can be fairly well correlated with a cycle ratio under constant strain amplitude. (2) The rain flow method is shown to be suitable in predicting microcrack propagation life as well as in evaluating fatigue failure life. (3) The essential conditions for Miner's rule to hold under variable strain cycling conditions are that the microcrack propagation law shows a relation of the linear type, dl/dN = Cl, and that prior fatigue damage hardly influences the subsequent microcrack growth rate.

本文言語英語
ページ(範囲)1276-1281
ページ数6
ジャーナルTransactions of the Japan Society of Mechanical Engineers Series A
52
477
DOI
出版ステータス出版済み - 1986
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 材料科学一般
  • 材料力学
  • 機械工学

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