A Damage Accumulation Model for Elasto-Plastic Fatigue

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  • 損傷累積モデルによる弾塑性疲労の考察
  • ソンショウ ルイセキ モデル ニヨル ダンソセイ ヒロウ ノ コウサツ

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With a stochastic model based on damage accumulation, the author has investigated high cycle fatigue in which plastic deformation can be neglected. In elasto-plastic fatigue, plastic deformation must be considered and damage accumulation process cannot be assumed to be generated by a Poisson process because of frequent occurrence of damage accumulation. In this paper, the model was improved in these respects in oder that elasto-plastic fatigue phenomena can be treated. With this improved model, fatigue life up to crack initiation was calculated and the results were compared with experiments. Furthermore J(N) (fatigue J-integral) proposed in a previous paper was obtained with the use of this model and it was shown that the growth rate of small crack was proportional to J(N). With the above crack initiation model and the above propagation law of small fatigue crack, total fatigue life was evaluated.

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