J. Olowonigba, K. Veluswamy, D. Salem
South Dakota Scholl of Mines and Technology, South Dakota, United States
Poster stand number: W104
Keywords: Impact , thermal insulation, heat exchange, Light weight, Functionally graded composite material,Defense facilities in remote, cold regions need lightweight building materials that combine demanding thermal-insulation performance, structural-load bearing properties, and the ability to render significant protective shielding to occupants. While there are many lightweight materials with impressive insulation properties, few of them can be engineered/effectively combined with other materials to provide the necessary structural and protective needs. Our research aims to develop multifunctional-insulation and heat-exchange composites to meet these needs by developing and integrating a practical and cost-effective technologies based on rational design and processing control of composite hybrids, cellular-structures, and porous-networks. The three-layered composites were able to modulate and dissipate stress-waves at the frequencies where damping was expected from the rational-design criteria applied, validating the impact tuning concept investigated our studies. The thermal-insulation, compressive and impact-energy dissipating properties were studied in detail for a range of multilayer composites structures, designed to utilize the impedance mismatch between the layers in the structures to reduce the peak force and provide viscous dissipation to reduce the impulse. Our material possessed a ~45% lower material density yet demonstrated up to ~66% reduction in thermal conductivity while achieving reductions in the Head Injury Criterion (HIC) value of up to 45% at a 65J impact-energy.