Experimental Investigation on the Effects of Core/Facing Interface Performance on the Low-Velocity Impact Behavior of Ho
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JMEPEG https://doi.org/10.1007/s11665-020-05181-2
Experimental Investigation on the Effects of Core/Facing Interface Performance on the Low-Velocity Impact Behavior of Honeycomb Sandwich Panels Ahmet Meram and Mehmet Emin C¸etin (Submitted May 25, 2020; in revised form August 26, 2020; Accepted: 8 September 2020) This paper gives an important contribution by investigating the effectiveness of core/facing interface performance of aluminum honeycomb sandwich panels under low-velocity impact energy. Low-velocity drop tests were conducted on five different panels under 50, 75, and 100 J impact energies (loads). The following procedure is followed to evaluate the impact response of panels: the force–time histories are acquired; the numerical integration method is applied, and force–displacement histories are obtained; and then the damage mechanism and theoretical energy balance modeling are used to analyze the effectiveness of core/facing interface performance on the impact behavior of the panels. Scanning electron microscopy is used to examine the microstructural and the morphology of the core/face sheet interface of the aluminum honeycomb sandwich panels. The effects of voids, interface, and cohesive cracks on the impact behavior of the panels are analyzed. Energy balance modeling proved that energy absorbed in the bending and shear deflections increased as the resistance at the core/facing interface is increased. In addition, changing the initial impact energy from 50 to 100 J produced more than 120% increase in the effectiveness of the panels in terms of energy absorbed in shear and bending deformations. Keywords
core/facing interface, energy balance model, failure mechanism, honeycomb sandwich panel
1. Introduction Honeycomb sandwich panel is a three-layer structure panel, consisting of a top and bottom skin sheet with a honeycomb core at the middle, which are bonded together by interface adhesive layer. These structures are widely used in aerospace, military, automotive, railway, and marine industries due to its lightweight and high stiffness (Ref 1-7). During its entire life, these structures are exposed to impact stresses due to various factors. The localized impact load can cause damage to sandwich panels, which results in reduction of load-carrying capacity of the sandwich panel and reduced performance. Because of this fact, investigation on the impact response of the sandwich panels has been receiving much attention from many researchers (Ref 8-11). Generally, theoretical, numerical, and experimental approaches are used to investigate the lowvelocity impact response of the sandwich structures (Ref 1215). For instance, Foo et al. (Ref 16) numerically investigated the effect of various geometric parameters on the low-velocity impact response of aluminum honeycomb sandwich panels. Zhang (Ref 17) experimentally investigated the energy absorption capacity of aluminum sandwich panels under low-velocity impact loading using a spherical projectile. Moreover, there are Ahmet Meram, Department of Mechatronics Engineeri
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