Implanted Fiber Reinforcement of Laminated Composites
Technology Description ESLI investigated the development of damage tolerant composites based on laminated composites which were reinforced with individual through-thickness fibers. Such reinforcement was expected to improve interlaminar strength without degrading in-plane strength. The fiber implantation method, which did not involve stitching or weaving, also appeared suitable for large scale processing.Potential Benefits Increasing the interlaminar strength of composite materials can improve damage tolerance and reduce aircraft weight by permitting the use of thinner skins and primary structures. Development Status ESLI performed a Phase 1 SBIR contract with the U.S. Air Force to develop techniques and materials for the interlaminar reinforcement of laminate composites. Phase 1 efforts focused on experimentation with the process variables and evaluation of diverse fiber materials, fiber diameters, lengths, and laminate forms (unidirectional and woven). Reinforced composite samples were fabricated for short beam shear mechanical testing. Potential improvements in the damage tolerance of composite facesheets and the potential for aircraft weight reduction were also assessed. Phase 2 further developed the process, which was scaled up to fabricate and test prototype composite panels and components. U.S. Air Force Phase 1&2 SBIR |
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