新型燃料组件上部连接结构数值仿真与分析

Simulation and Analysis of New-Type Fuel Assembly Top Connection Structure

燃料组件上部连接的功能在于提供燃料组件结构的连续性和保证燃料组件结构的稳定性,对燃料组件的安全和性能起着至关重要的作用。为分析和评价一种新型燃料组件上部连接结构,考虑接触非线性、材料非线性以及大变形等因素,利用有限元分析软件ABAQUS建立了该新型上部连接结构的数值仿真模型。通过数值仿真结果与试验结果的对比,认为本文建立的有限元仿真模型合理,可用于该新型燃料组件上部连接结构的分析与评价。最后对上部连接的抗拉过程进行了详细分析,认为摩擦力是其承载能力的关键因素。

The function of fuel assembly top connection is to provide structure continuity and ensure the structure stability of fuel assemblies, so it plays an important role in the safety and performance of fuel assemblies. In order to analyze and evaluate a new-type fuel assembly top connection structure, considering contact nonlinear, material nonlinear and large deformation, a numerical simulation model is established in this paper by using ABAQUS. By comparison of the simulation result and the experimental result, the established finite element model is considered to be reasonable, and can be used to analyze and evaluate this new-type top connection structure. Finally, the tensile process of the top connection is analyzed in detail, and it is concluded that the friction force is the key factor for its tensile capacity.