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提出了一种用于反应堆压力容器法兰密封系统密封分析的瞬态耦合热弹塑性接触有限元分析方法,在弹性接触问题有限元混合法的基础上,把材料非线性和表面非线性两种迭代过程耦合求解,在瞬态温度场分析中将伽辽金法和向后差分法结合起来,并用混合法进行热接触迭代,把瞬态温度场分析和弹塑性接触分析耦合。根据这套方法编制了完整的反应堆压力容器法兰密封系统冷热态密封分析程序,其中还包括前后处理程序。程序系统模块化,自动化程度高,稳定性好,人机界面友好,已成功地用于核压力容器模拟体的分析。数值分析结果和实验结果吻合良好,并已应用于大型工程实际问题的分析,所得结果完全符合工程设计要求。
A transient coupled thermo-elasto-plastic contact finite element method for the seal analysis of the flanged seal system of reactor pressure vessel is proposed. Based on the finite element method of elastic contact problem, two methods of material nonlinearity and surface non-linearity The iterative process is coupled and solved. In the transient temperature field analysis, the Galerkin method and backward difference method are combined, and the thermal contact iteration is performed by the hybrid method. The transient temperature field analysis and elastoplastic contact analysis are coupled. According to this method, a complete cold and hot seal analysis program of the flange sealing system of the reactor pressure vessel has been prepared, which also includes the pre-post processing program. Modular system program, a high degree of automation, good stability, friendly man-machine interface, has been successfully used for nuclear pressure vessel simulation body analysis. The results of numerical analysis are in good agreement with the experimental results and have been applied to the practical problems of large-scale projects. The results obtained are in full compliance with the engineering design requirements.