The Micro Plastic Stress-Strain Hysteresis Loops of Steel during the Fatigue Process

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  • 疲れ過程における応力ひずみ履歴曲線についで
  • 疲れ過程における応力ひずみ履歴曲線について
  • ツカレ カテイ ニ オケル オウリョクヒズミ リレキ キョクセン ニ ツイテ

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Abstract

In order to investigate the analysis of fatigue stage and prediction of fatigue life, the micro plastic stress-strain hysteresis loops were measured through all stages of fatigue process by wire strain gauge 3∼4 mm in length. The main results obtained are as follows : (1) The size of hysteresis loop is varied, and the fatigue lives were shorter at the large variation. (2) The fatigue process can be divided into the three stages, the 1st stage is within 8% of the life and after 50% of the life it proceeds to the 3rd stage. (3) The prediction of fatigue life by non-destructive method is opened up by measuring the micro plastic hysteresis loops during the fatigue process. (4) The experimental results obtained can be analysed basing on the assumption that the meta stable and the unstable state are initiate and propagate statistically by moving of atoms.

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