Mechanical Response of Square Honeycomb Sandwich Plate with Asymmetric Face Sheet Subjected to Blast Loading

Abstract

Sandwich structures are widely used in many important engineering to resist the blast loading. In order to improve the capacity of energy absorption, topology of core structure, .e.g. foam, folded plate, square and hexagonal honeycombs, and pyramidal truss is studied. However, very few investigations have been carried out to study the dynamic mechanical response and energy absorption of sandwich plate with asymmetric face sheet. In this paper, the dynamic mechanical response of sandwich plate with asymmetric face sheet is numerically analyzed using LS-DYNA code. For the sandwich plate with asymmetric face sheet, the thickness of core, the thickness of wall, the cell size and the mass of sandwich plate are fixed in analysis. We take the thickness ratio δ of the upper face sheet to the lower face sheet to be 2/5, 3/4, 1, 4/3 and 5/2, respectively. The maximum deflection and energy absorption of the sandwich plate subjected to blast loading are investigated for different δ. And the performance of the sandwich plate is compared to that of the solid plate with the same mass and the same material. The efficiency of energy absorption and the performance of resistance to blast are also obtained for the five structures under the same mass of TNT charge. The effect of δ on the dynamic response of square honeycomb is discussed. The results can be used for optimizing design of sandwich plate with enough resistance to blast.