Award Data

FIBER REINFORCED PLASTIC COMPOSITE MATERIALS ARE AVAILABLE WITH A VARIETY OF PERFORMANCE FACTORS AND MANUFACTURING METHODS. THERE ARE SEVERAL STRUCTURAL CONCEPTS THAT CAN BE UTILIZED WITH COMPOSITES. THIS PROJECT IS TO PERFORM A FEASIBILITY STUDY TO DETERMINE THE APPLICABILITY OF FIBER REINFORCED PLASTIC COMPOSITE MATERIALS FOR COMBATANT SUBMARINE STRUCTURES. EXAMPLES OF STRUCTURES TO BE ANALYZED ...

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"A study is proposed in which the performance of an underwater acoustic vector sensor (AVS) containing conventional piezoelectric transducers is compared with that of an AVS containing single crystal piezoelectric transducers. An acoustic vector sensor isa device that measures three orthogonal components of the acoustic particle velocity in conjunction with the acoustic pressure at a single point ...

"Acoustech proposes a Phase I study to develop an acoustic dyadic sensor using piezoelectric single crystals. The study combines theoretical and numerical modeling along with experimental data obtained from a pre-prototype unit to assess the feasibility ofdeveloping a full scale unit during Phase II for a surveillance application. Greater sensor directivity in a comparable or smaller sized packag ...

An aqueous-based finish (sizing) was developed in Phase I to improve the carbon/vinyl ester interfacial bond. The finish is composed of a reactive coupling agent, a low viscosity vinyl ester resin, a free radical inhibitor, and a surfactant. The reactive finishes substantially improved the carbon/vinyl ester interface compared to unsized or FOE sized materials. Failure mode analysis shows that ...

New high-temperature sizings are needed to improve the properties and durability of carbon/polyimide composites. Compatibility with weaving and braiding operations and improved wetting during prepregging or resin infusing polyimide resin is also needed. Achieving these characteristics will result in reducing life cycle costs for jet engine composites through better property translation, reduced ...

High-temperature (HT) polymer matrix composites (PMCs) are desired for many aerospace and military applications. Silicon carbide (SiC) fibers provide a potentially attractive reinforcement for HT PMCs for applications ranging from propulsion systems to structures for the orbiting space plane. The sizings routinely added to commercial SiC fibers are not compatible with the new HT matrix resins. ...

The Navy intends to start using a significant quantity of composite structures in surface ship construction in an effort to decrease costs as well as to reduce the visibility of the ships to radar. The large size of the target structures necessitates the use of low temperature, non-autoclave processing techniques such as Vacuum Assisted Resin Transfer Molding (VARTM). In the recent past, most m ...

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