クリープ疲労微小き裂発生・成長の数値シミュレーションによる高温構造材料の余寿命診断方法

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  • Method for Evaluationof Remaining Life in High Temperature Component Based on Numerical Simulation of Small Crack Initiation and Growth in Creep-Fatigue.
  • クリープ ヒロウ ビショウ キレツ ハッセイ セイチョウ ノ スウチ シミュレ

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In order to achieve the objective of securing the reliability of high-temperature components, it is necessary to establish a method for predicting the remaining life of their materials subjected to severe creep-fatigue damage. It was reported by the authors that multiple small cracks initiated along grain boundaries on the specimen surface at the very early stage of life in creep-fatigue and their growth and coalescence formed the main crack which induced the failure. Moreover, the process of small crack initiation and growth showed random behavior due to microstructural inhomogeneity. A stochastic model was proposed and the failure process was numerically simulated by means of the Monte Carlo method. This paper provides a scheme of the small-crack-simulation-method for the evaluation of remaining life of the materials in high-temperature components, which is an integration of our previous studies and is summarized in a flow chart.

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