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High strain rate mechanical behavior of Ti-6Al-4V octet lattice structures additively manufactured by selective laser melting (SLM)

This publication relates to work that QCML & WIU performed on the Army Research Lab-Ballistic Protection Program with collaborators at University of North Texas. Titanium alloy octet lattice samples were designed with a range of strut radii (0.1-0.5mm) and were fabricated using metal powder bed fusion 3D printing technology. Lattice structures are of interest due to their high specific strength and energy absorption compared to bulk materials, while fabrication through additive manufacturing enables greater design flexibility.

High strain rate behavior was evaluated using a Split-Hopkinson Pressure Bar testing system. The research found that specific energy absorption and strength were highest for the smallest strut radius due to the enhanced and prolonged elastic deformation exhibited by that design. The results of this research could be utilized to provide better energy absorption during ballistic-type impacts, which can result in better protection for soldiers.

S. Gangireddy, M. Komarasamy, E. J. Faierson, R. S. Mishra, “High strain rate mechanical behavior of Ti-6Al-4V octet lattice structures additively manufactured by selective laser melting (SLM),” Materials Science & Engineering A, Vol. 745, pp 231-239, 2019. https://doi.org/10.1016/j.msea.2018.12.101.

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