Mechanical Performance Of The 3D-Kagome Truss Panels

Sandwich structure with Kagome truss core, a new truss core structure with superior mechanical performance, is brought forward in recent years. Compared with tetrahedral and pyramidal truss cores, 3D-Kagome truss core possesses the higher strength, greater resistance to plastic buckling and shows the excellent isotropic performance.In this thesis, the unit cell of Kagome struts is identified as a solid cell with the same geometrical dimension. The computational model of effective properties of Kagome truss core is developed. The theory of equivalent strain is used to derive the equivalent yield strength and stiffness formulas of the structure subjected to out-of-plane loads and transverse shear loads. Meanwhile, The critical stress formulas of the structure in the case of elastic-plastic buckling are derived with the help of material mechanics. A comparative study of the stiffness, plastic yield and elastic buckling strength of Kagome, Tetrahedral and honeycomb cores is developed and their mechanical performance is estimated as well.The analytical model of the 3D-Kagome truss core panels subjected to idealized impulsive loads is established. The truss core with a mass of periodic unit cells is identified as a solid plate. The equivalent constitutive model for Kagome core is employed and the equivalent strength and stiffness of the core is obtained. The transient dynamics analysis software MSC.Dytran is adopted to simulate the response of 3D-Kagome truss core panels subjected to idealized impulsive loads. The responses of the displacement, velocity and effective stress in the whole time history are obtained. The variations of maximum deflections of the plate with the relative density and the thickness of the core and impulsive loads are investigated. Thus, the optimum design program of the structure for impulse resistance is given. Compared with the solid plates with the same weight, the 3D-Kagome truss core panels have significant advantages in impulse resistance, energy absorbing and dissipation.Finite element software MSC.Natran is used to get the low order frequency and modal analysis. result shows that the vibration of the structure is similar to...