【摘要】 在核压力容器钢的中子辐照脆化评价中，断口剪切面积百分比是一个重要的参数。但此参数不易直接测量，对于辐照后的放射性试样其测量更加困难。本文采用 Charpy- V示波冲击试验，并根据计算机采集得到的完整记录冲击过程的载荷-位移曲线，即可确定相应的载荷特征值，同时估算出断口剪切面积百分比。该估算方法用于计算核压力容器钢因中子辐照引起的脆性转变温度的变化值，其计算结果较为准确且计算方法也简便，现已成功地应用于大亚湾核电站压力容器的辐照监督试验。更多还原

【Abstract】 ： Percent shear fracture appearance is an important factor to evaluate neutron irradiation embrittlement of nuclear pressure vessel steel.But it is difficult to measure the irregular surface directly,especially for post- irradiation speciments.Depending on Charpy- V instrumented impact tests,characteristic load values can be determined according to load- deflection curve which completely represents the impact failure processes,and percent shear fracture appearance can be estimated using different formula.The estimating method is more effective to calculate irradiation- induced changes in transition temperature,which already successfully applied to the irradiation surveillance test of reactor pressure vessel steel of Daya- bay nuclear power station.更多还原