压水堆燃料组件结构搅混格架动态屈曲仿真研究  

Analysis for the Dynamic Buckling Behavior of the Spacer Grid Structure of PWR Fuel Assembly

作　　者：郭严 张玉相 GUO Yan;ZHANG Yu-xiang(China Nuclear Power Technology Research Institute,CGN,Shenzhen,Guangdong Prov.518026,China)

机构地区：[1]中广核研究院有限公司,广东深圳518026

出　　处：《核科学与工程》2018年第4期533-539,共7页Nuclear Science and Engineering

摘　　要：结构搅混格架作为压水堆燃料组件中的关键部件,由于结构复杂,一直是燃料组件设计的重点和难点。本文采用有限元分析软件建立17×17结构搅混格架有限元分析模型,对其在冲击载荷作用下动态屈曲过程进行了数值模拟研究,得到了不同初速度冲击下的冲击载荷、回弹速度、冲击位移变化曲线,通过以上参量开展格架动态屈曲判定准则的对比验证研究,确定了结构搅混格架动态屈曲的临界载荷。同时基于冲击板作简谐振动的假设,采用周期法计算格架动刚度,基于能量原理建立格架等效阻尼的计算方法。通过与试验结果的分析对比,验证分析方法的合理性,用于指导新型燃料组件格架分析与设计。The spacer grid is a key element of fuel assembly.Due to its structural complexity,the analysis and design of the spacer grid structure are difficult.This paper discusses the structural analysis of a 17×17 fuel assembly grid including the detailed grid structural elements,through which,the impact force,rebound velocity and time history of displacement and as well as other mechanical properties of the grid under different initial impact velocity were obtained.This paper carried out studies for the dynamic buckling criterion,and determined the dynamic buckling load of the spacer grid.Based on the assumption of simple harmonic vibration of the impact process,the methods to determine the dynamic stiffness and the equivalent viscous damping of the spacer grid were proposed.Experiments were also performed for comparison with analytical results.It found out that the analytical results are in good agreement with the experimental results.As a result,it can be concluded that the 17×17 fuel assembly model including detailed grid elements is able to yield accurate analytical results.

关 键 词：结构搅混格架 动态屈曲 动刚度 等效粘性阻尼 

分 类 号：TL352[核科学技术—核技术及应用]