论文部分内容阅读
基于英国R6规范选择3的方法构建了核压力容器接管安全端两种异种金属焊接结构(含隔离层的四材料结构和不含隔离层的三材料结构)的失效评定图(Failure assessment diagram,FAD),并分析了裂纹位置和裂纹深度对FAD的影响。结果表明,两种结构的极限载荷基本相同,裂纹位置对极限载荷基本没有影响。随裂纹位置由管嘴向316L安全端管区域靠近及随裂纹深度的增加,失效评定曲线(Failure assessment curve,FAC)下移,结构的安全性降低。由于两种焊接结构中,相同位置、相同尺寸裂纹的FAD和极限载荷基本相同,因而其抗断裂性能和结构强度基本相同。
Based on the UK R6 Code Option 3, a failure assessment diagram (FAD) was constructed for the two dissimilar metal welded structures (including the four-material structure of the isolation layer and the three-material structure without the isolation layer) on the safety end of the nuclear pressure vessel. ), And analyzed the impact of crack location and crack depth on FAD. The results show that the ultimate load of the two structures is basically the same, and the crack location has no effect on the ultimate load. As the position of the crack approaches from the nozzle to the 316L safety tube area and the crack depth increases, the failure assessment curve (FAC) moves downward and the structural safety decreases. Since both FAD and ultimate load of the same position and same size crack are basically the same in both welded structures, their fracture resistance and structural strength are basically the same.