Abstract
A study was conducted to evaluate the crack propagation behavior in a surface cracked pipe at elevated temperatures. The fatigue and creep-fatigue crack propagation tests were carried out for 316FR steel pipe (base metal pipe and weldment pipe) under four point bending at 650°C. Fracture mechanics parameters. fatigue J-integral range (ΔJj) and creep J-integral range (ΔJc), were estimated by the simplified analysis method based on the reference stress approach. The estimated crack propagation behavior was compared with the experimental results. It was confirmed that the proposed method in this paper gave a good estimate.
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