On the Relationship between the Fatigue Stages of Steel and the Micro Stress-Strain Hysteresis Energies

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  • 疲れ段階の分析と応力ひずみ履歴仕事
  • ツカレ ダンカイ ノ ブンセキ ト オウリョクヒズミ リレキ シゴト

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Abstract

In the previous paper, it was reported that the fatigue being measured by the wire strain gauges of 3 mm in length on the micro stress-strain hysteresis loops was observed at three stages. In this paper, the fatigue stages of steel was observed and concluded as follows : (1) At the 1st stage, the yield point observed on hysteresis loop and the strain hardening varied. (2) At the 2nd stage, slip and recovery varied. (3) At the 1st stage, the fatigue damage was recovered at 600°C but at the 2nd stage it was not recovered. (4) The microcrack started at the beginning of the 2nd stage. (5) We proposed that the unstable state ξand the metastable state ηseemed to be produced by the distortion of crystal lattice, and micro hysteresis loops were caused by their accumulation. (6) The fatigue lives were prolonged when the variance of ξon the 1st stage and of ηon the 2nd stage was minimized.

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