School of Engineering, RMIT University, Australia
Triply Periodic Minimal Surfaces Sandwich Structures Subjected to Shock Impact
Triply-Periodic-Minimal-Surfaces (TPMS) are cellular structures that naturally inspired continuous non-self-intersecting surfaces with controllable mechanical properties. In this work, sandwich composite panels constructed from four different types of TMPS unit cells and metallic facets are numerically investigated and compared to evaluate the dynamic behaviors when subjected to blast loadings. The finite element analysis is employed to characterize the deformation of proposed structures taking into account the rate-dependent properties, elastoplastic response, and nonlinear contact.
The Johnson-Cook material model is implemented to capture the transient responses of the TPMS sandwich panels under high strain-rate loadings. The numerical model is validated with a two-dimensional analytical one revealing the static sand dynamic crushing strengths. Due to the symmetry, only a quarter of the panel is simulated using simple shell elements, which significantly reduces the computational cost.
A series of studies are conducted to evaluate the influences of different design parameters on the blast resistances of TPMS composite panels. Reaction forces and critical stresses extracted from underneath protected structures are assessed for various key parameters including TPMS type, thickness, number of layers. TPMS sandwich structures clearly demonstrate unique dynamic crushing responses, impact energy mitigation & dissipation mechanisms, which leads to the enhancement of the blast resistance.
Dr. Jonathan (Phuong) Tran is a senior lecturer (associate professor) in Civil & Infrastructure Engineering, School of Engineering, RMIT University. He has established a research group on 3D printing of smart materials and biomimetic structures achieving various national and international awards such as “Highly commendable paper award, 12th Int. Conf. on Shock & Impact Loads on Structures”. He has authored over 4 book chapters and over 100 peer-reviewed journal articles. His research has been featured in over 300 online and broadcast stories in mainstream, science and trade-focused media including Reuters, New York Post, Australian Manufacturing, and Daily Mail.
He serves as a member of editorial board for JOM, and Journal of Materials Science in Additive Manufacturing and various standard committees on “Quality requirements for additive manufacturing in building & construction”.