10MW高温气冷堆压力容器主法兰结构的有限元接触分析

10MW高温气冷堆（HTR－10）压力容器主法兰是HTR－10的关键结构部件，对HTR－10的正常运行起着重要作用。HTR－10压力容器主法兰采用主螺栓进行联接，采用一道金属“O”形环和一道“Ω”环进行密封。该研究课题对此主法结构进行了弹塑性接触计算，利用有限元分步加载技术模拟了主螺预紧以及加压过程中主法兰的应力和位移情况。计算采用二维轴对称结构模型和MSC MARC2000有限元程序。结果表明，无论是预紧状态还是设计压力状态。HTR－10主法兰能满足强度要求，“O”形环和“Ω”环也都有满足密封要求。

Contact Stress Analysis for the Flanges of HTR-10 Pressure Vessel

The flanges are the key structures of the HTR-10 pressure vessel and play an important role during its service life.They are bolt-connected and the sealing components consists of a metallic O-ring and a welded Ω -ring.An elastic-plastic nonlinear analysis is considered to evaluate the stress and deformation of flanges.In order to simulate the processes of pre-tightening and pressurizing of HTR-10 pressure vessel,the loads are added by multi-step skill.The MSC MARC 2000 is employed and an axisymmetric finite element model is used.The analysis results show that the flanges can meet the strength requirement and the O-ring and the Ω -ring seal the HTR-10 pressure vessel very well during both the pre-tightening and pressurizing.