Abstract
The present study investigates the effects of close-range blast loading of fibre metal laminates (FMLs) fabricated from woven glass polypropylene and aluminium alloy 2024-T3. The polypropylene layers and anodized aluminium are stacked in 3/2 layering configuration to investigate the impact energy absorbed through deformation and damage. In order to study the blast responses of FMLs, a 4-cable instrumented pendulum blast set-up is used. Effects of blast impulse and stand-off distance were examined. Investigation of the cross-section of FMLs are presented and damages such as fibre fracture, debonding, and global deformation are examined. Increasing stand-off distance from 4 to 14 mm resulted in a change of damage mode from highly localized perforation to global deformation.
Highlights
Fibre-reinforced polymer (FRP) laminates, fibre metal laminates, and sandwich composites are used in a broad range of light-weight structures such as armoured vehicles, aerial drones, tanks, ships, and aircraft
The results indicated that for panels with 28 layers, by amplification of impulse from 12 to 28 N.s, the maximum back face deflection increases from 22 to 30 mm [31]
For mode II failure, back face metal tearing or petalling was observed for thin fibre metal laminates (FMLs) in higher intensity impulse [20,21]
Summary
Fibre-reinforced polymer (FRP) laminates, fibre metal laminates, and sandwich composites are used in a broad range of light-weight structures such as armoured vehicles, aerial drones, tanks, ships, and aircraft. Many researchers studied the effect of fibre material in FRP laminate [1], resin material in laminate [2] and geometry of laminate [3,4] under impulsive loading. In the case of fibre effect on blast resistance, Tekalur et al have conducted a research which has indicated that failure in carbon-reinforced laminate is dominated by a sudden destructive brittle form of damage [1]. The laminate with E-glass fibre reinforcement demonstrates progressive damage under impulsive loading. In the case of matrix effect on blast resistance, Yahya and his colleagues have indicated epoxy resin does not improve the blast resistance in comparison with thermoplastic resin [2]
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