APPLICATION OF THE UNIFIED STATISTICAL MATERIAL DATABASE FOR DESIGN AND LIFE/RISK ASSESSMENT OF HIGH TEMPERATURE COMPONENTS
来源期刊：Acta Metallurgica Sinica2004年第4期
论文作者：Y.Nakatani K.Fujiyama S.Matsumoto A.Sakuma Y.Akikuni K.Saito S.Hayashi T.Fujiwara
Key words：statistical analysis; material property; steam turbine; life assessment; risk;
Abstract: Statistical manipulation of material data was conducted for probabilistic life assessment or risk-based design and maintenance for high temperature components of power plants. To obtain the statistical distribution of material properties, dominant parameters affecting material properties are introduced into normalization of statistical variables. Those parameters are hardness, chemical composition, characteristic microstructural features and so on. Creep and fatigue properties are expressed by normalized parameters and the unified statistical distributions are obtained. These probability distribution functions show good coincidence statistically with the field database of steam turbine components. It was concluded that the unified statistical baseline approach is useful for the risk management of components in power plants.
Y.Nakatani1，K.Fujiyama1，S.Matsumoto2，A.Sakuma3，Y.Akikuni2，K.Saito3，S.Hayashi2，T.Fujiwara2
(1.Power and Industrial Systems R&D Center, Industrial and Power Systems & Services Company, Toshiba Corporation, Tsurumi-Ku, Yokohama 230-0045, Japan;
2.Thermal and Hydro Power Division, Industrial and Power Systems & Services Company, Toshiba Corporation, Minato-Ku, Tokyo 105-8001, Japan;
3.Keihin Product Operations, Industrial and Power Systems & Services Company, Toshiba Corporation,Tsurumi-Ku, Yokohama 230-0045, Japan)
Abstract:Statistical manipulation of material data was conducted for probabilistic life assessment or risk-based design and maintenance for high temperature components of power plants. To obtain the statistical distribution of material properties, dominant parameters affecting material properties are introduced into normalization of statistical variables. Those parameters are hardness, chemical composition, characteristic microstructural features and so on. Creep and fatigue properties are expressed by normalized parameters and the unified statistical distributions are obtained. These probability distribution functions show good coincidence statistically with the field database of steam turbine components. It was concluded that the unified statistical baseline approach is useful for the risk management of components in power plants.
Key words:statistical analysis; material property; steam turbine; life assessment; risk;
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