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压力容器接管嘴位置结构和载荷情况比较复杂,若假想缺陷位于压力容器进口接管内隅角位置,在考虑接管载荷作用时,裂纹为复合型裂纹。建立含裂纹的三维有限元模型,分析在接管载荷单独作用、内压与接管载荷共同作用下裂纹尖端应力强度因子的分布和变化规律。分析结果表明,在仅考虑接管载荷时,进口接管内隅角位置应力强度因子KI、KII和KIII都比较小,应力强度因子近似对称分布;内压对裂纹尖端的应力强度因子KII和KIII基本没有影响。
Pressure vessel nozzle structure and load situation is more complicated, if the imaginary defect is located in the pressure vessel inlet to take over the corner position, taking into account the load effect, the crack is a composite crack. The cracked three-dimensional finite element model was established and the distribution and variation of stress intensity factor at crack tip were analyzed under the joint action of load-take alone, internal pressure and joint load. The results show that the stress intensity factors KI, KII and KIII are relatively small in the corner of the inlet pipe when the pipe load is taken into account, and the stress intensity factor is approximately symmetrical distribution. The stress intensity factors KII and KIII of the crack tip are basically not influences.