Beremin模型预测尺寸效应对A508-3钢断裂韧性的影响

断裂韧性是用于表征反应堆压力容器（RPV）钢脆性状态的重要指标。在开展相关研究时，由于辐照空间小等原因，一般采用小尺寸紧凑拉伸（CT）试样。为掌握CT试样尺寸变化对国产RPV钢断裂韧性测试结果的影响，对国产A508-3钢的不同尺寸CT试样进行了测试分析，采用Beremin模型方法研究了尺寸效应对断裂韧性数据的影响，并建立了不同尺寸CT试样的断裂韧性数据归一化模型（TSM）。结果表明，同一温度下实验测得的断裂韧性值随试样尺寸的减小逐渐增大，不同样品通过标准方法得到的归一化数据存在偏差，本文建立的TSM可有效减小换算数据偏差。

Size Effect on Fracture Toughness of A508-3 Steel Predicted by Using Beremin Model

Fracture toughness is an important index to characterize the brittle state of reactor pressure vessel (RPV) steel. During the irradiation embrittlement study of RPV steel, small size compact tension (CT) specimens are generally used, because of the limited space for irradiation test. In order to understand the effect of CT specimen size on fracture toughness test result of domestic RPV steel, different sizes CT specimens of domestic A508-3 steel were tested in this paper. Size effect on fracture toughness data was studied by Beremin model method. Then the fracture toughness data normalization model (TSM, a modified toughness scaling model) of different sizes CT specimens was established. The results show that the fracture toughness increases with the decrease of sample size at the same test temperature. The normalized data of different specimens obtained by standard method has deviation. The TSM established in this paper can reduce the deviation of converted data.