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Abstract
Triply periodic minimal surfaces (TPMS) have attracted tremendous research interest due to their lightweight and superior mechanical properties. In this study, two TPMS sheet-based structures (FRD and Neovius) are designed, fabricated, and tested under dynamic and quasistatic loading conditions. Selective laser melting (SLM) is employed to facilitate the fabrication of such complex structures out of stainless steel (SS316L). Scanning electron microscopy (SEM) is utilized to assess the quality of the printed structures. The dynamic compressive behaviour is investigated through performing a direct impact compression test via a Direct Impact Hopkinson Bar (DIHB) at a strain rate of 2000 s-1. Quasi-static tests are also performed at a strain rate of 0.005 s-1. The specific energy absorption (SEA) is compared under both loading conditions to investigate the performance of such structures under dynamic loading. Results show that both structures exhibit higher SEA values under high deformation rates. In fact, Neovius structures outperform FRD structures in terms of specific energy absorption as it exhibits a SEA value of 22.11 J/g and 24.8 J/g SEA in quasi-static and dynamic conditions, respectively.
Highlights
Nature-inspired triply periodic minimal surfaces (TPMS) have attracted significant attention due to their superior mechanical properties
The mechanical properties of TPMS lattice structures have been extensively studied in literature under quasi-static loadings
The authors concluded that TPMS lattices usually exhibit stretch-dominated deformation, which enhances their strength to weight ratio
Summary
Nature-inspired triply periodic minimal surfaces (TPMS) have attracted significant attention due to their superior mechanical properties. Such lightweight structures can be potential candidates for applications in the fields of automotive, aerospace and military. The mechanical properties of TPMS lattice structures have been extensively studied in literature under quasi-static loadings. A study by Maskery et al [1] explored the energy absorption of Gyroid TPMS structures under quasi-static compression. Studies by Al-Ketan [3,4,5] showed that diamond lattices exhibit superior compressive modulus and strength when compared by other topologies. The mechanical performance of TPMS lattices have not been explored under dynamic loading
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