【摘要】 <正> 接管是核压力容器的一种重要结构形式,在内压作用下接管内壁角裂纹应力强度因子K₁是规范要求的对该部位作断裂评定的重要依据。用改进的1/4边中节点三维20节点等参奇异元和位移法计算了球接管内壁角裂纹的应力强度因子K₁及其变化分布规律,分析了K₁与裂纹及结构的几何参数关系。所得结果和三维光弹性冻结切片法试验分析结果十分吻合。进一步计算分析了柱接管内壁角裂纹应力强度因子K₁及其与裂纹和结构几何参更多还原

【Abstract】 Nozzle is an important structural type of nuclear pressure vessel. The stress intensity factor (SIF) K1 for inside corner crack of nozzle under internal pressure is an important basis for fracture evaluation of this region required by code. An improved 3-D 20-node isoparametric singular element with quater-points and displacement method are used to calculate SIF K1 and its variation and distribution for inside corner crack of nozzle. The relationships between K1 and geometric parameters of crack and structure are analyzed. The results are coincide with those ob- tained from 3-D photoelastic test. On the bases of calculations and analyses as above, the simple and conservative formulae calculating SIF K1 for inside corner crack of nuclear vessel nozzle under internal pressure are obtained. These formulae are verified by 3-D photo-elastic test and can be used in engineering.更多还原