基于主曲线法的核电主管道材料断裂韧性研究  

Study on Fracture Toughness of Nuclear Power Main Pipeline Material Based on Master Curve Method

作　　者：刘庆[1] 王庆 马若群 徐宇 LIU Qing;WANG Qing;MA Ruoqun;XU Yu(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Nuclear and Radiation Safety Center,Ministry of Ecology and Environment,Beijing 102445,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]生态环境部核与辐射安全中心,北京102445

出　　处：《原子能科学技术》2020年第10期1900-1903,共4页Atomic Energy Science and Technology

摘　　要：核电工程的防脆断设计和在役缺陷评价主要应用线弹性断裂力学,并基于材料断裂韧性进行评价。材料断裂韧性需通过试验测定,首先采用落锤试验和V型缺口冲击试验共同确定参考温度,或采用主曲线法确定参考温度,然后将参考温度和材料温度作为变量建立关系式描述材料的断裂韧性。主曲线法能通过较少的试样试验得到材料的断裂韧性,并具有较高的置信度,因此在工程中已得到越来越多的应用。文中采用ASTM E1921标准,应用主曲线法测量了某核电厂主管道材料的参考温度,确定了材料的断裂韧性,并与ASME第Ⅺ卷附录G中的断裂韧性进行比较。结果表明,采用主曲线法得到的材料断裂韧性更高,工程应用中减少了保守裕度,提高了经济性。The design against brittle fracture and in-service defect evaluation of nuclear power engineering mainly use linear elastic fracture mechanics,and the evaluation is based on the fracture toughness of the material.The fracture toughness of the material needs to be determined by testing.First,the reference temperature is determined by the drop weight test and the V-notch impact test,or by master curve method,then the reference temperature and the material temperature are used as variables to establish a relationship to describe the fracture toughness of the material.The master curve method can obtain fracture toughness through the fewer sample tests and the higher confidence,so it has been used more and more in engineering.In this paper,the ASTM E1921 standard was used to measure the reference temperature of the main pipeline material of a nuclear power plant using the master curve method.The fracture toughness of the material was determined,and compared with the fracture toughness in Appendix G of ASME VolumeⅪ.The results show that the fracture toughness of material obtained by the master curve method has higher value,and the conservative margin is reduced in engineering,so economy is improved.

关 键 词：断裂韧性 主曲线法 无延性转变温度 

分 类 号：TL353.1[核科学技术—核技术及应用]