A PREDICTION MODEL FOR EXTREMELY LOW CYCLE FATIGUE LIFE UNDER VARIABLE STRAIN AMPLITUDE

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  • TATEISHI Kazuo
    社団法人 土木学会 名古屋大学 エコトピア科学研究機構
  • HANJI Takeshi
    社団法人 土木学会 名古屋大学大学院 工学研究科土木工学専攻
  • MINAMI Kuniaki
    社団法人 土木学会 株式会社 サクラダ 技術開発室

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  • 極低サイクル疲労領域における変動振幅ひずみ下の低サイクル疲労寿命予測モデル
  • ゴクテイ サイクル ヒロウ リョウイキ ニ オケル ヘンドウ シンプク ヒズミカ ノ テイサイクル ヒロウ ジュミョウ ヨソク モデル

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Abstract

For predicting the low cycle fatigue life under variable strain amplitude, Mini's rule has been accepted as a simple and effective idea. In extreme large strain field corresponding to the fatigue life of less than ten cycles, however, the accuracy of Miner's rule has not been verified yet. In this study, by means of a newly developed testing system, low cycle fatigue tests under variable strain amplitude in extreme large strain field was conducted. The test results showed Mine's rule always predicted longer fatigue life than actual life. As another idea for predicting low cycle fatigue life, we proposed a simple model introducing the damage mechanics concept and examined its validity.

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