SA-01-3(088) Creep-Fatigue Crack Growth Evaluation of Low Alloy Steel under Displacement-Controlled Conditions(Life Assessment of Thermal Power Plant 1) :

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In the remaining life assessment of high-temperature structural components after long-term service, a practical evaluation of crack growth lifetime using nonlinear fracture mechanics is needed. In this study, creep-fatigue crack growth behavior under displacement-controlled conditions is examined using CT specimens of 2 1/4Cr-lMo steel. The J-integral estimation method and the crack growth prediction method using the fully plastic solution are also examined. Creep-fatigue crack growth under displacement hold can be separated into fatigue crack growth in the cyclic portion and creep crack growth in the holding portion. These two mechanisms are competitive with each other, and the crack growth behavior is determined by the dominant one of fatigue and creep. The J-integral approach using the fully plastic solution is introduced for predicting low cycle fatigue crack growth and creep-fatigue crack growth with relaxation. The propriety of this solution is verified by comparing the prediction with experiments of the slope-line-control method.

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