Application of Lightweighting Technology to Military Aircraft, Vessels, and Vehicles (2012) / Chapter Skim
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Pages 1-6
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For aircraft, weight is a critical determinant of performance, payload capacity, maneuverability, and range. Reducing vehicle weight without compromising other important attributes such as survivability or payload capacity has traditionally been accomplished through the substitution of lightweight materials for heavier ones within conventional design configurations.
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; • Research to improve understanding of materials' response and failure mechanisms; and • Enhancement and broader use of computational models that can accelerate the materials development and qualification cycle through integrated computational materials engineering. The committee addressed its charge by reviewing illustrative examples of lightweighting in air, sea, and land vehicles, with a focus on military applications.
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, a strategy that extends from materials design through structural design in an integrated fashion, thereby including the ability to design new materials as part of achieving optimal structural performance. In the committee's judgment, ICME tools and methods offer the greatest opportunity to accelerate the development and validation of new materials and processes for lightweighting, which would bring the current lengthy development cycle for these new materials and processes more into line with the generally much shorter design cycles for vehicles and products.
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Finding 3: Advanced technology demonstration programs have, in numerous instances, proven to be successful in introducing breakthrough technologies into DoD platforms. The risk with the ATD approach is the potential for unexpected consequences when using new materials, manufacturing techniques, and designs that have not been rigorously tested.
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Domestic manufacturing capabilities for advanced materials and for military applications using them are limited or even declining in some areas, particularly when there is no parallel commercial demand for lightweight transportation systems. The boom-to-bust cycle that ties defense contractors to the DoD's procurement cycle threatens the maintenance of a robust defense industrial base.
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One existing program, the Defense Production Act Title III program, includes a number of materials projects relevant to lightweighting, such as production of SiC powder for ceramic armor, low-cost titanium, and continuousfilament boron fiber, but does not include some of the materials and manufacturing processes that the committee believes would have the greatest impact on lightweighting. The cost of advanced materials extraction, reduction, and processing can be prohibitive, and there is a lack of domestic manufacturing infrastructure to fabricate the primary metal alloys or the intermediate engineering forms, or to manufacture final, shaped products.
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