Abstract
Low velocity ballistic deformation behavior of closed-cell aluminum metal foam targets fabricated by powder metallurgy technique has been investigated. The metal matrix of aluminum (60 micron) was mixed with carbamide (CH4N2O) particles of size one mm. Green samples were obtained by compacting the mixture followed by sintering process using a muffle furnace and the metallic foam thus obtained had an average pore size of 1.5 mm. Compared to metallic material, significant reduction in hardness and density was observed when the porosity was increased from 5 to 30%. Using a gas gun setup, low velocity (100 m/s and conical projectile) ballistic experiments were conducted on metal foam targets to understand the deformation behavior. Not any penetration of the projectile was observed when the percentage of porosity was less than 5%. When the percentage of porosity was increased, the projectile was able to perforate the target as the fracture toughness decreases. The size of fragmented areas of the perforated targets and depth of penetration (DoP) of the projectile were measured. Decrease in DoP (improved ballistic resistance) was observed with the increase in relative density of the closed foam target. Even though the projectile could perforate the foam target, no cracks were observed which enhances the suitability of the metal foams to be used as structural applications of defense vehicles.
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The authors would like to acknowledge the financial support received from the management of Sri Sivasubramaniya Nadar College of Engineering to develop the gas gun setup.
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Suresh Kumar, S., Sabareeswar, R., Siddharth Krishna, S. et al. Failure Investigations on Low Velocity Ballistic Impact Deformation of Closed-Cell Aluminum Metal Foam Targets. J. of Materi Eng and Perform 33, 1842–1851 (2024). https://doi.org/10.1007/s11665-023-08079-x
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DOI: https://doi.org/10.1007/s11665-023-08079-x