文献类型：期刊文献

英文题名：Modified J estimation by GE/EPRI method for circumferential surface cracked pipes under bending or combined bending and pressure loads

作者：Zhang, Jing[1]; Liu, Chang-Jun[1]; Xuan, Fu-Zhen[1]; Li, Pei-Ning[1]

机构：[1] Key Laboratory of Safety Science of Pressurized System, East China University of Science and Technology, Ministry of Education, Shanghai, China

年份：2011

卷号：3

起止页码：1029

外文期刊名：American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP

收录：EI(收录号：20133416626605)

语种：英文

外文关键词：Nuclear fuels - Nuclear power plants - Failure (mechanical) - Pressure vessels - Surface defects - Elastoplasticity - Cracks

摘要：In order to assess the structural integrity of the components in nuclear power plants, it is necessary to accurately evaluate the J-integral. EPRI J-integral estimation method has been widely used. However for the pipes with circumferential surface cracks, since the solutions of fully plastic factors H1 were few under the combined pressure and bending loading condition. In such a case, EPRI J-integral might be non-conservative in elastic-plastic transition zone. Considering the problems, detailed finite element analysis (FEA) were conducted in this work, and H1, shape factors F were provided for the pure pressure, pure bending, and combined pressure and bending conditions. The reasons for non-conservatism of EPRI method were discussed, and a modified J estimation method was developed. For validation, failure assessment curves (FACs) were employed to compare the proposed J-integral estimation, EPRI J-integral and FEA method. The results showed that FAC based on the proposed Jintegral method agreed well with FEA result, which provided good confidence in the use of this method. ? 2011 by ASME.