表面き裂を有する圧力容器のぜい性破壊強度に関する研究

概要

論文の詳細を見る
Experimental study on strength of pressure vessel models have been carried out using two types of test model ; one is the cylindrical shape which has a notch at the inner surface and the other is the pressure vessel with nozzles which have surface notches at the nozzle corner. The notches were made with special cutting grinder so that the notch tip radius becomes as sharp as 0.1mm. The material of cylindrical part of the vessel is the ASTM A533B-Class 1 steel and that of nozzle part is the ASTM A508-Class 2 forging steel.Almost of all models were tested at temperature range of the elastic-plastic brittle fracture behavior. The experimental results were analized relating to the effects of notch length (2c), notch depth (U) ratio to the vessel plate thickness (t) and mean radius (R) of test vessel on fracture stress (σ_f) ratio to the flow stress (a) of the material used at test temperature. The fracture stress strongly depended on the parameter c/√<R>and also t_1/t. Using c√<R> it was found that fracture stress ratio σ_f/σ^^- was expressed by the equation as follows σ_f/σ^^=M^<-1>_s = [1+α(c/√<R>)^2] ^<-1/2> where α=0.140(t_1/t)^2 In conclusion, the fracture hoop stress σ_f was able to be predicted precisely with the surface notch parameter Ms and the flow stress using above equation. In case of elastic brittle fracture behavior, the brittle fracture hoop stress could also be predicted using the brittle fracture stress σ_F of flat plate with the same surface notch instead of the flow stress.
独立行政法人海上技術安全研究所の論文
1985-05-30

表面き裂を有する圧力容器のぜい性破壊強度に関する研究

スポンサーリンク

概要

著者

関連論文

スポンサーリンク