Fiber-Reinforced Propellant Bond Technology DescriptionESLI investigated a fiber reinforcement concept for propellant bonding to replace most or all of the adhesive liner with a high surface area carbon fiber substrate. The fiber diameter, length, packing fraction and surface treatment are adjusted for maximum bond effectiveness corresponding to a given grain distribution and binder composition. These fiber placement and insertion methods were also suited for large scale use. Potential Benefits The proposed bondline reinforcement concept potentially results in a simpler motor assembly process, as well as lighter and more reliable propellant castings. Development Status ESLI performed a Phase 1 SBIR contract with the U.S. Air Force to develop new materials and assembly techniques for casting solid rocket motors. Phase 1 effort involved initial coupon peel testing from which promising configurations were selected for evaluation using the blister test method with 12" specimens. Candidate fiber attachment and insertion methods were evaluated and tailored for use with rocket insulation materials. Test results were interpreted in terms of a preliminary model that accounted for fiber type, distribution, and interfacial adhesion properties. Under Phase 2 work, ESLI is currently continuing to develop processes conducive to cost-effective assembly of high-reliability solid rocket motors. U.S. Air Force Phase 1&2 SBIR (FO4611-94-C-0080) |
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