Carbon fiber reinforced plastics (CFRP)/aluminum honeycomb sandwich panel, as a composite structure with lightweight, energy absorption, shock absorption and strong impact resistance, has been widely used in practical protective engineering. In this paper, CFRP/aluminum honeycomb sandwich panels are taken as the target. Firstly, the accuracy of the simulation is determined by comparing the numerical simulation with the experimental results. Secondly, numerical simulation is carried out by combining front and rear panels with different thicknesses, multi-layer and different honeycomb apertures. The analysis shows that the thicker the rear panel is, the stronger the impact resistance of the sandwich panel is. The energy absorption effect of the sandwich panel was increased by 21.75% when the rear panel was 5.5 mm compared with that of the front panel. At the same thickness, the impact resistance of multi-layer sandwich panels is enhanced with the increase of layers, and the energy consumption of eight-layer sandwich panels is increased by 21.22% compared with that of single-layer sandwich panels. When the thickness of the rear panel is unchanged, the increase of the aperture of aluminum honeycomb has an exponential relationship with the energy absorption of the sandwich panel. Finally, the energy absorption value of the sandwich panels is fitted with the thickness of each layer, the relationship between the energy absorption value of the sandwich panels ΔE (Y) and the thickness of each part of the sandwich panels (A, B, C) is obtained. The optimal solution is obtained under specific constraint conditions and the combination modes of sandwich panels.
In order to reveal influence of external capacitance on the voltage input and input energy provided by the PZT-5H piezoelectric ceramic composite structure under high-speed impact loading, experiments have been performed by using one-stage light gas gun loading system combining with a power supplier circuit and power output testing system, which the aspect ratio of 1:1 column projectile impact monolithic and multi-piece piezoelectric ceramic composite structure at the near impact velocity and different storage capacity. The experimental results show that the more larger storage capacitance is, the smaller the piezoelectric ceramic output voltage is. However, the smaller of the capacitor voltage is, the smaller the value of energy storage is; with the energy storage capacitance increasing, the piezoelectric capacitance ratio and the energy conversion rate of piezoelectric ceramics decreases; In addition, the storage energy capacitor increases with the increasing of the piezoelectric ceramic layers; the relationships of storage energy capacitor and piezoelectric ceramic capacitor has a great influence on the input voltage and storage energy for storage energy capacitor.
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