压力容器2023，Vol.40Issue(10)：58-66,9.DOI:10.3969/j.issn.1001-4837.2023.10.007
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
Applicability analysis of influence coefficient method of stress intensity factor calculations of a crack at nozzle corner of reactor pressure vessel
摘要
Abstract
The fracture mechanics parameters were calculated by finite element method(FEM)and influence coefficient methods of fitness-for-service(FFS)codes,including ASME Ⅺ Appendix 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 approximately10.00%;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Key words
nozzle/corner crack/stress intensity factor/finite element method/fitness-for-service codes分类
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占勇,焦广臣,温建锋..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[J].压力容器,2023,40(10):58-66,9.基金项目
国家自然科学基金项目(52122506,51875203) （52122506,51875203）
两机专项(J2019-Ⅳ-0010-0078) （J2019-Ⅳ-0010-0078）
上海市东方学者岗位资助项目(TP2019022) （TP2019022）
