胶粘结薄壁空心球结构的压缩力学行为研究

RESEARCHES ON COMPRESSIVE MECHANICAL BEHAVIORS OF ADHESIVE BONDED THIN-WALLED HOLLOW SPHERES STRUCTURE

以乒乓球为基本单元,对胶粘结薄壁空心球之间的连接颈进行简化,通过实验和有限元数值模拟研究了薄壁空心球两球列结构的压缩力学行为。实验结果证明了有限元模型的有效性。然后利用有限元数值方法研究了薄壁空心球以及连接颈几何、材料等参数对结构力学行为的影响。研究结果表明:(1)两球列结构中变形球经历了弹性变形、轴对称屈曲、形成非轴对称多边形、向轴对称模式转变四个阶段;(2)结构的弹性模量和屈服应力均随着空心球壁厚、连接颈半径、中心厚度以及空心球材料的弹性模量、屈服极限的增大而增大;(3)结构发生自接触行为时的应变随着连接颈中心厚度和半径的增大而增大。

Compressive mechanical properties of thin-walled hollow spheres structure were researched by experiment and finite element method.Ping-Pong balls were selected and bonded together with a linking neck to comprise the ideal model of thinwalled hollow spheres structure.The experimental result validated the effectiveness of the finite element model.The effects of the material and geometry parameters of the hollow spheres and the linking neck were then investigated by finite element method.The results reveal that:(1)the deformation process of the structure includes four stages:elastic deformation,axisymmetric buckling,forming non-axisymmetric polygon and transforming to axisymmetric mode;(2)the elastic modulus and yield stress basically increase with the hollow sphere wall thickness,linking neck radius and center thickness as well as the Young’s modulus and yield stress of spheres material;(3)the strain of structural self-contact behavior increases with the linking neck center thickness and radius.