Kagome点阵夹芯板的抗冲击性能研究

RESEARCH ON IMPULSE-RESISTANT PERFORMANCE OF SANDWICH PANELS WITH KAGOME TRUSS CORE

Kagome点阵夹芯结构是近年来提出的一种力学性能十分优异的新型点阵夹芯结构。建立了3D-Kagome点阵夹芯板在理想冲击载荷作用下的分析模型,将含有大量周期性单胞的芯子等效为实体板,得到了Kagome芯子的等效本构关系,给出了芯子的等效强度和刚度。采用有限元方法模拟3D-Kagome夹芯板在理想冲击载荷作用下的响应,研究了板的最大挠度随芯子相对密度、芯子的厚度参数和冲击载荷大小的变化规律,得出了该结构抗冲击的最优化设计方案。与相同重量的实体板比较发现,3D-Kagome点阵夹芯板在抵抗冲击、能量吸收和耗散等方面具有很大的优势。

Sandwich structure with Kagome truss core, a new type of truss core structure with superior mechanical performance, is brought forward in recent years. The analytic model of 3D-Kagome truss core panels subjected to idealized impulsive loads is established. Truss core with a mass of periodic unit cells is equivalent to a solid plate. The equivalent constitutive model for Kagome core is employed and equivalent strength and stiffness of the core is gained. Finite element method is adopted to simulate the response of the 3D-Kagome truss core panels subjected to idealized impulsive loads. The variations of maximum deflections of the plate with relative density of the core, the thickness of the core and impulsive loads are investigated. The optimum design scheme of the structure for impulse resistance is obtained. Compared with the solid plates of the same weight, 3D-Kagome truss core panels have significant advantages in impulse resistance, energy absorbing and dissipation.