基于优化方法的燃料组件简化梁模型材料参数等效研究

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中图分类号：TL352；TP391.92 文献标志码：B

Study on material parameter equivalence of simplified single beam model of fuel assembly based on optimization method

FENG Xuanla， GUO Yan2，LI Kangqiao2， LIANG Guopeng XIAO Changjiangla，LU Mengkai3，GUAN Guan1b，MEI Yue1a （1.a.Department of Engineering Mechanics；b.School of Naval Architecture，Dalian University of Technology， Dalian 116O24，Liaoning，China；2.China Nuclear Power Technology Research Institute， Shenzhen 518031，Guangdong，China；3.School of Mechanical Engineering and Mechanics， Ningbo University，Ningbo 315211，Zhejiang，China）

Abstract：Inorder to solve the problem that the analysis of some mechanical behaviors of the refined solid model of the fuel assembly will consume huge computing resources and be time-consuming and laborious，based on certain assumptions and simplifications，an optimization algorithm is used to establish a 2D semi-refined model of 4 beams and a 3D simplified model of single-beam equivalent to the solid model of the fuel assembly.The optimization method is used to equivalent the stiffess and density of the 2D semi-refined model of 4 beams to the 3D simplified model of single-beam. The results show that under the same load boundary conditions，the displacement and first-order modal eigenvalues of the equivalent 3D simplified model of single-beam and 2D semi-refined model of 4 beams are basically the same after adding the material parameter results calculated by the optimization iteration.It is feasible to use the equivalent optimization method from the 2D semi-refined model of 4 beams to the 3D simplified model of single-beam，which improves the computational eficiency of some mechanical analysis of the whole core model.

Key words： fuel assemblies； simplified beam model； material parameter； optimization； equivalent； computational efficiency

0引言

堆芯燃料组件是核反应堆中的重要部件，在运行过程中受堆内辐照和高温影响，其材料呈现出复杂的非线性力学行为，使得燃料组件产生轴向、弯曲和扭转等宏观变形，给反应堆的安全运行造成一定影响。（剩余5565字）