Sandwich Beams With Gradient-density
Aluminum Foam Cores Subjected To
Impact Loading
Author(s)
J. Zhang & G. P. Zhao
Abstract
The dynamic response of end-clamped sandwich beams is predicted by loading
the beams at mid-span using metal foam projectiles. The sandwich beams
comprise aluminum alloy face sheets and aluminum foam cores. The aluminum
foam cores, having identical areal density, exist in homogeneous core, low-high
gradient-density core or high-low gradient-density core. Two-dimensional (2D)
finite element (FE) models were created from tomographic images of the foam
cores, which represent the cell shape and geometric distribution of the real
foams. A quasi-static compressive test was carried out on a MTS machine for
homogeneous aluminum foam core to obtain the mechanical properties of the
gradient-density foam cell wall. A uniformly distributed pressure versus time
history is employed to simulate a shock impulse involving high-speed impact of
aluminium foam projectiles. Two deflected shapes of the sandwich beams are
found to be bend dominated mode and stretch dominated mode according to the
different initial impulse. The sandwich beams with different densities foam cores
outperform monolithic solids of equivalent weight in the bend dominated
domain. The benefits diminish at large deflections, as the response becomes
stretch-dominated. In bend dominated domain, the sandwich beam with
homogeneous foam cores shows smallest mid-point deflection of back face
sheet, while smallest average compressive strain of aluminum foams cores
occurs in sandwich beams with high-low gradient-density foam cores.
Keywords: cellular solid, impact loading, blast resistance, dynamic simulations.
Keywords
cellular solid, impact loading, blast resistance, dynamic simulations.
Related Book
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