New design fatigue curves were developed in the Subcommittee on Design Fatigue Curve in the Atomic Energy Research Committee in the Japan Welding Engineering Society. When the new design fatigue curves are incorporated into the JSME Environmental Fatigue Evaluation Method, the environmental fatigue analysis will be optimized. The validity and the applicability of the new design fatigue curves into the JSME evaluation method have been studied and some factors have been revised.  
Also, the Japanese PWR group developed environmental fatigue correction factors (Fen) of austenitic stainless steel base metal, weld metal and cast stainless steel for PWR environment. The applicability of those Fen factors with the new design fatigue curve of austenitic stainless steels has been studied to the environmental fatigue data used for the development of the current Fen factor of austenitic stainless steels in the JSME Environmental Fatigue Evaluation. In accessing the applicability, the Fen factor for austenitic stainless steel base metal has been selected, because the Fen factor for austenitic stainless steel base metal is the most conservative and the predicted fatigue lives by the new design fatigue curve of austenitic stainless steels with the new Fen factor have bounded the experimental data.  
These outcomes have been proposed to the JSME code committee to incorporate these proposals into the JSME Environmental Fatigue Evaluation Method.  
 


Study on Incorporation of New Design Fatigue Curves and a New Environmental Fatigue Correction Factor for Pwr Environment Into the Jsme Environmental Fatigue Evaluation Method

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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