反应堆压力容器接管区角裂纹应力强度因子影响系数法适用性分析  

A pplicability analysis of influence coefficient method of stress intensity factor calculations of a crack at nozzle corner of reactor pressure vessel

作　　者：占勇 焦广臣 温建锋[2] ZHAN Yong;JIAO Guangchen;WEN Jianfeng(Shanghai Huice Information Technology Co.,Ltd.,Shanghai 201108,China;Key Laboratory of Pressure Systems and Safety(MOE),School of Mechanical and Power Engineering,East China University of Science&Technology,Shanghai 200237,China)

机构地区：[1]上海辉策信息科技有限公司,上海201108 [2]华东理工大学机械与动力工程学院承压系统与安全教育部重点实验室,上海200237

出　　处：《压力容器》2023年第10期58-66,共9页Pressure Vessel Technology

基　　金：国家自然科学基金项目(52122506,51875203);两机专项(J2019-Ⅳ-0010-0078);上海市东方学者岗位资助项目(TP2019022)。

摘　　要：分别采用有限元法(FEM)和合乎使用(FFS)规范ASMEⅪ附录G,API 579,RCC-MRx中的影响函数法计算了断裂力学参数,求解了不同工作载荷和不同裂纹尺寸下的反应堆压力容器接管区角裂纹应力强度因子(SIF),对比了不同方法中SIF计算结果的差异,并讨论了采用不同合乎使用规范进行工程结构断裂参量计算的适用性。结果表明,对于裂纹前缘最深点应力强度因子的计算,随着裂纹尺寸的增加,基于API 579和方法2的SIF结果由不保守约10.00%逐渐变化为保守约10.00%;RCC-MRx方法的保守度为12.50%和20.00%之间;ASME方法1的SIF结果的不保守度逐渐增大,最大不保守程度可达到15.00%左右。对于裂纹前缘SIF最大值的计算,API 579,ASME方法1和ASME方法2的不保守度可接近20.00%;ASME方法2比其他3种方法的不保守度更大,最高可达34.65%。现有的FFS规范方法不适用于计算接管区角裂纹前缘的最大值,需要发展新的计算方法或公式。The fracture mechanics parameters were calculated by finite element method(FEM)and influence coefficient methods of fitness-for-service(FFS)codes,including ASMEⅪAppendix G,API 579 and RCC-MRx,respectively,stress intensity factors(SIFs)of a crack at nozzle corner of reactor pressure vessel were solved under different crack sizes and different types of loads,the differences in SIF results calculated by different methods were compared,and the applicability of using different FFS codes to calculate fracture parameters of engineering structure was discussed.The results show that for the calculation of SIF at the deepest point of crack front,with the increase of crack size,the SIF results given by ASME method 2 and API 579 will gradually change from non-conservative by approximately 10.00%to conservative by approximately 10.00%;the degree of conservatism of the RCC-MRx code is between 12.50%and 20.00%;the degree of non-conservatism of SIF results in ASME method 1 gradually increases and can reach about 15.00%max.For the calculation of the maximum SIF of crack front,the degree of non-conservatism of API 579,ASME method 1 and ASME method 2 can be close to 20.00%;ASME method 2 has greater non-conservatism than the other three methods,and can reach max.34.65%.The existing calculation methods in the FFS codes are not suitable for calculating the maximum SIF values of crack front in nozzle corner,therefore,it is necessary to develop a new calculation method or formula for SIFs.

关 键 词：接管区 角裂纹 应力强度因子 有限元法 合乎使用规范 

分 类 号：TH49[机械工程—机械制造及自动化] TL351[核科学技术—核技术及应用] TH123