High Adhesion Marking Paint for Portland Cement Concrete

Material systems that meet the insertion loss (IL) requirements of current acoustic windows have been shown to have difficulty meeting the structural properties required for undersea operation. In this proposal, Materials Sciences Corporation (MSC)outlines a research program to develop and demonstrate new and innovative fiber reinforced composite material concepts that have low IL across a wide frequency range yet have stiffness and strength characteristics necessary to survive undersea operationalloads. The material solutions to be investigated will not rely on a tuned core to provide the required insertion loss characteristics; rather MSC plans to investigate innovative continuous fiber reinforced composite designs that are compatible with alow-cost composite manufacturing process. The leading candidate is a hybrid construction, comprised of a small amount of specialty glass and organic fiber reinforcement, that results in a composite material with a characteristic impedance that isacoustically transparent across a wide frequency range. Laboratory tests will be conducted to provide acoustic and structural response data needed to validate analysis tools used to select promising material candidates. Once validated, these analysistools will be used to evaluate alternate acoustic window designs for sonar array systems proposed for the DD21.The leading application for the materials developed under this effort will be higher performing acoustic windows for use in U.S. Navy combatantssuch as the DD21 and submarines produced by Bath Iron Works, Litton/Ingalls Shipbuilding, and Electric Boat Corp. In addition to these direct applications, MSC will pursue application of the products of this SBIR to commercial sectors, which transmitacoustic signals through materials, including those in the fishing industry, the oil exploration industry and the medical industry.