Load dispersion mechanism of a novel structure composed by pre-stretched fabrics and lattice

Abstract

Combining the projectile resistance of ultra-high molecular weight polyethylene (UHMWPE) fabric with the energy absorption abilities of lattice structures, this study proposed a novel lightweight structure which has good cushion performance under local projectile impact. This approach compensates for the low stiffness of the fabric and the susceptibility of lattice structures to perforation damage under localized impacts. The designed projectile impact testing system enabled the impact loading and characterization of the combination of pre-stretched fabric and lattice structures. Finite element simulations were conducted to compare the effects of fabric pre-stretch and lattice unit cell topology on cushioning behavior. The results indicate that the fabric effectively prevents perforation damage to the lattice metastructure caused by projectile. The pre-stretched fabric allowed more unit cells to participate in deformation, transforming the load distribution on the silicone protected by the structure from a diamond shape to a larger circular shape. The Kelvin foam lattice primarily facilitated relative rotation between rods at the nodes during impacts, enabling the structure to convert concentrated loads into distributed loads. This research proposes a novel protective approach, promising application of lightweight structures in human protection.