Auxetic Metamaterials under Direct Impact Loads in a Structural Health Monitoring Framework

作者: Chandan Kittur , Michael Coatney , Anindya Ghoshal , Ben Chamish , James Ayers

DOI:

关键词: Acoustic waveMetamaterialAmplitudeMaterials scienceAuxeticsActuatorAnisotropyFrequency responseStructural health monitoringStructural engineering

摘要: Abstract : Under direct impact from ballistic loads, acoustic waves typically propagate throughout a structural component causing damage to sensitive areas. For structures with intelligent embedded monitoring systems, such as mounted piezoelectric actuators, between 150 200 m/s of small-caliber rounds has produced catastrophic results. This report focuses on redirecting using non-traditional configurations. The technical approach utilizes periodic and graded metamaterials (produced auxetic cellular, lattice topology material composition), which are lightweight can be assembled for extreme anisotropy phononic bandgaps, exploited alter the propagation path high amplitude stress waves. research initial stage understanding how tailor lattices highly concentrated blast generally produce broadband frequency response yield only partial bandgaps. Specific attention is given square, hexagonal, re-entrant, modified re-entrant topologies. As baseline comparison, solid aluminum plate examined against uniform unit cell lattices. plates individually subjected both in- out-of-plane loading conditions 0.22-caliber fragment simulating projectile traveling at 300 m/s. A less than 10% marginal difference in peak exists single through-the-thickness cell.

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