Abstract
To study the influence of structure size and composite forms on the mechanical properties of the composite double honeycomb sandwich structure, a composite double honeycomb sandwich structure was initially designed. The dynamic response of a composite double-layer honeycomb sandwich structure under high-speed impact was studied through theoretical analysis and numerical simulation. Ls-dyna software was used to simulate the initially designed composite structure. According to the numerical simulation results and the proposed method for calculating the fracture energy of the composite double honeycomb sandwich structure, the effects of different composite forms on the mechanical properties were analyzed. The results show that the proposed fracture energy calculation method can effectively describe the variation trend of the honeycomb structure and the micro-element fracture situation in the valid time. The fracture energy curve has a high sensitivity to cell density and material, and the strength of the top core has a great influence on the overall energy absorption. Compared with the traditional honeycomb protection structure, the energy absorption of the initially designed composite honeycomb sandwich structure was improved effectively.
Highlights
Rigid sandwich structures are widely used in military fields such as aerospace, shipping, and armored vehicles because of their high specific strength, specific rigidity, specific energy absorption, and other characteristics
Gholami et al [6] used particle swarm optimization (PSO) technology to optimize the design of a composite sandwich panel with a honeycomb core structure
The energy absorption rate is the main index to measure the mechanical properties of honeycomb structures
Summary
Rigid sandwich structures are widely used in military fields such as aerospace, shipping, and armored vehicles because of their high specific strength, specific rigidity, specific energy absorption, and other characteristics. Gholami et al [6] used particle swarm optimization (PSO) technology to optimize the design of a composite sandwich panel with a honeycomb core structure. They found that the optimal geometry of a honeycomb cell had the properties of radius and thickness converging to their bottom bounds, while its length converged to its top bound. Liu et al [11] studied the influence of impactor shape on low-velocity impact behavior by combining experimental and numerical simulation methods They found that the damage—consisting of fiber damage, matrix damage, panel delamination, and core member buckling—was dependent on the impactor shape, impact energy, and impact location.
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