核级导向弹簧压缩临界载荷计算方法研究

Calculation Method for Critical Buckling Load ofNuclear Guide Springs

应用一种当量柱体的结构简化模型对核级导向弹簧压缩后屈曲变形和临界载荷进行分析计算。通过采用点接触和线接触等逐步深入的分析方式,建立了简化的力学分析模型;并通过应用当量柱模型求解,建立了不同屈曲模态下轴向载荷和限制失稳结构之间的接触关系,通过计算得到了弹簧压缩临界载荷条件;研究结果表明,弹簧弯曲变形、摩擦力对弹簧弹射力的实际影响较小,在核级导向弹簧弹射力设计过程中可以忽略影响。

In this paper,the structure of nuclear guide springs is simplified into an equivalent cylinder buckle model to calculate the buckling deformations and critical loads.The simplified mechanical model is devised based on point contact and line contact theories,step by step,and solved by the aforementioned equivalent cylinder model to establish the contact relations between axial load and bi-laterally constrained buckling structure under different buckling modes,and thereafter to calculate the critical buckling load.This paper articulates the effects of deformation and friction on the ejection force of springs.The results show that the deformation and friction force of the springs have little effects on the ejection force,and provide a simplification on the design process of the nuclear guide springs.