Abstract:
Objective To enhance the energy-absorption efficiency of auxetic (negative Poisson’s ratio, NPR) honeycombs for naval blast protection, a novel in-plane NPR honeycomb is proposed that combines a straight-wall, tetra-ligament, anti-chiral aluminium alloy skeleton with a foam-concrete infill.
Methods Finite-element models were built in ABAQUS using S4R shell elements for the 6061-T6 alloy framework and C3D8R solid elements for the foam-concrete filler. In-plane crushing was simulated at 1 m s−1, 15 m s−1 and 100 m s−1, and the collapse modes (crushing mode), stress-strain responses and volumetric specific energy absorption (SEA) of unfilled, polyurethane-filled and foam-concrete-filled specimens were compared.
Results The foam-concrete infill altered the collapse mode, distributed stresses more uniformly and introduced brittle-material characteristics into the stress–strain curves. At high (100 m s−1), medium (15 m s−1) and low (1 m s−1) impact velocities the SEA of the filled honeycomb exceeded that of the unfilled baseline by more than 200 %.
Conclusion The tetra-ligament, anti-chiral architecture successfully couples the ductility of the metallic framework with the brittle crushing behaviour of foam concrete, offering a promising solution for lightweight, high-efficiency blast protection in ship structures.
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