摘要
压水堆主管道上充管嘴在核电厂运行期间需经受严厉的冷热流体交互流动产生的循环热载荷,将对上充管嘴的结构完整性产生重要的影响。上充管嘴弹性应力分析证明了结构不会出现弹性失稳、塑性失稳以及疲劳破坏等现象,但部分分析截面一次加二次应力强度范围超过了规范限值。针对弹性分析部分结果不满足规范限值的情况,对上充管嘴进行了循环弹塑性分析,结果表明,上充管嘴结构在循环载荷作用下出现了明显的塑性安定现象,并且经历所分析的循环载荷后,其结构的累积应变不会对结构抗塑性失稳能力和抗疲劳破坏能力产生显著的影响。上充管嘴抗快断分析表明,其结构具备良好的抗快断性能。
The severe cyclical thermal loadings which generated by the interaction flow of hot and cold fluid are subjected to the charging nozzle of PWR primary piping during the operation of nuclear power plants. The loadings have significant impact on the structural integrity. The types of damage（ elastic instability,plastic instability,fatigue and so on） do not occur for the nozzle is proved by elastic analysis. For some analysis sections,the range of primary plus secondary stresses cannot be validated and the cyclical elastoplastic analysis is used. The results show that the behavior of plastic accommodation occurred under the cyclical loadings and the cumulative strain induced by repeated loads do not diminish the capacity to prevent the damage of plastic instability and fatigue. The results of resistance to fast fracture analysis show that the nozzle has a good ability of resistance to fast fracture.
出处
《压力容器》
2016年第2期67-73,80,共8页
Pressure Vessel Technology
关键词
上充管嘴
弹塑性
塑性安定性
快断
charging nozzle
elastoplastic
plastic accommodation
fast fracture
