【摘要】 运行温度下的弹塑性断裂韧性参数是核电厂含裂纹缺陷压力管道设计、评价和分析的重要数据输入。高温环境会对弹性卸载柔度法的准确性造成影响。基于载荷分离理论的规则化数据处理方法无需同步测量裂纹扩展量即可获得材料弹塑性断裂性能数据J-R阻力曲线,具有明显优势。根据美国材料与测试协会(ASTM)E1820标准,对核电厂主蒸汽管道材料SA335-P11钢的紧凑拉伸(CT)标准试样在280℃高温环境进行J-R阻力曲线测定。对试验载荷位移试验数据分别采用弹性卸载柔度法和规则化数据处理方法进行对比分析,验证在高温试验环境下的分析中规则化数据处理方法对传统弹性卸载柔度法的可替代性。更多还原

【Abstract】 Elastic-plastic fracture toughness parameters of nuclear piping materials at operation temperature are of significant importance to the integrity assessment and fracture analysis based on EPFM for in-situ nuclear piping structures. Conventional elastic unloading method meets limitations at elevated temperature, while the NDRT(Normalization Data Reduction Technique) performs well without the need for simultaneous crack growth monitoring. J-R curve testing using C(T) specimens are carried out at elevated temperature in this paper. To validate the NDRT, the J-R curve at elevated temperature determined using the elastic compliance method is compared with that obtained by NDRT. The result matches each other very well, which provides a reference for researchers in the investigation of the material fracture property at elevated temperatures.更多还原