中文摘要：

对国标GB／T21143-2007和美标ASTME1820-08a中的CTOD（crack tip opening displacement）计算公式和阻力曲线评定方法进行对比研究，采用柔度法完成汽轮机转子材料Cr2Ni2MoV钢的CTOD试验，并分别根据两个标准对试验结果进行分析。结果表明，GB／T21143-2007中的CTOD计算公式和钝化线方程存在不合理的表达，对其进行相应修正；根据ASTME1820-08a得到的CTOD值通常稍低于由GB／T21143-2007得到的结果；钝化线方程的选取对启裂CTOD临界值的确定影响显著。

英文摘要：

Comparative study on differences of the formula of CTOD （crack tip opening displacement） computation and the evaluation of resistance curve between GB/T 21143-2007 and ASTM E1820-08a were conducted. Then by using compliance method, experiments on crack tip opening displacement （CTOD） for turbine rotor material Cr2Ni2MoV were carried out, and the experimental data were analyzed by use of the two test standards, respectively. The results show that, there are some mistakes in expressions of the CTOD calculation and blunt line equation recommended by GB/T 21143-2007, and corresponding correct expressions are proposed. Generally, the values of CTOD obtained by ASTM E1820-08a are slightly lower than those obtained by GB/T 21143-2007. The choice of blunt line equation has notable influence on the determination of critical CTOD of crack growth onset.