Amazing stuff!
"Scientists at Johns Hopkins University may have invented the perfect material for protective gear. They’ve devised a new material that is strong and sturdy like metal, but is super lightweight like foam. The material performed very well in preliminary tests, which suggests it could be a real game-changer for the automobile and aerospace industries, as well as the military that could use it to fashion lighter body armor and helmets. ..."
From the abstract:
"A unique rate-dependent energy absorption behavior of liquid crystal elastomer (LCE)-based architected materials is reported. The architected materials consist of repeating unit cells of bistable tilted LCE beams sandwiched between stiff supports. The viscoelastic behavior of the LCE causes the energy absorption to increase with strain rate according to a power-law relationship, which can be modulated by changing the degree of mesogen alignment and the loading direction relative to the director. ... For a multilayered structure of unit cells, nonuniform buckling of the different layers produces additional viscoelastic dissipation. This synergistic interaction between viscoelastic dissipation and snap-through buckling causes the energy absorption density to increase with the number of layers. The sequence of cell collapse can be controlled by grading the beam thickness to further promote viscous dissipation and enhance the energy absorption density. It is envisioned that the study can contribute to the development of lightweight extreme energy-absorbing metamaterials."
No comments:
Post a Comment