UCLA researchers in the Department of Mechanical and Aerospace Engineering have developed a novel composite foam for impact applications.
Polymeric materials used for impact resistance often strain-harden, causing the skeleton struts and beams to stiffen up, the pores to collapse, and large stress buildup. This results in a sudden drop in the stress of the material with minimal energy absorption and momentum trapping. To circumvent these issues, phase transformation in a material is used as an energy dissipation mechanism, but current state of the art foams (i.e. Poron®) are only efficient at ambient conditions.
Researchers led by Professor Vijay Gupta have developed a novel composite foam using preformed lattices. The two-component blend has enhanced impact absorption properties, particularly at higher pressures, making it useful for very high energy impacts. Likewise, this composite foam outperforms Poron® under similar conditions and displays similar impact performance under a wide range of cold and hot temperature conditions (-17 ˚C to 50 ˚C). This composite foam material can be made from organic or inorganic materials and any commercial foam (polyurethanes, D30, polyuria, etc.) can be used.
Composite foam materials have been fabricated and extensively tested.
|United States Of America||Issued Patent||10,933,609||03/02/2021||2016-102|
Composite foam, two-component blend, porous foam, high pressure, wide temperature range, impact energy, cushioning, sealing, impact protection, impact attenuation