辐照监督重组冲击试样插入段选材的力学与数值模拟分析

Mechanical and Numerical Simulation Analysis for Insertion Section of Irradiation Surveillance Reconstitution Charpy Specimen

为解决核反应堆堆内空间有限而导致的辐照监督试样短缺问题,采用试样重组技术可利用有限的夏比冲击试样获得更多冲击数据,为核电厂的延寿提供数据支撑。本研究采用反应堆压力容器材料Ni-CrMo-V钢,分别在母材、焊缝和热影响区位置选材制备夏比冲击试样。结果表明,冲击试样在上平台区产生最大的塑性变形,而热影响区选材的上平台断头具有最大的塑性变形区,其长度约为8.5 mm。因此,Ni-CrMo-V钢重组试样的插入段最大长度应不大于19 mm。采用GTN模型模拟冲击过程与试验结果偏差小于5%,可有效用于冲击试样变形区长度的模拟。

To address the shortage of irradiation surveillance specimens due to limited space in nuclear reactors,limited Charpy specimen can be used to gather more impact data by specimen reconstitution techniques,so as to support the life extension of the nuclear power plant.In this study,Ni-Cr-Mo-V steel,which is used in reactor pressure vessels,was selected to create Charpy impact specimens from the base material,welds,and hot zones.The results showed that the Charpy specimen had the largest plastic deformation in the upper shelf,while the upper shelf fracture selected in the heat affected zone had the largest plastic deformation area with a length about 8.5 mm.Therefore,the maximum insertion length of the reconstituted Ni-Cr-Mo-V steel specimen should not exceed 19mm.The GTN model simulation of the impact process deviated from the test results by less than 5%,making it effective for simulating the deformation length of the impact specimen.