Advanced Organic Composite Materials for Aircraft Structures Future Program (1987) / Chapter Skim
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'DISCUSSION AND FINDINGS'
'DISCUSSION AND FINDINGS'
Pages 5-11
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From page 5... ...
High-performance military aircraft fly only 20 to 40 hours a month during peacetime and reach or exceed limit load relatively few times -- in the hundreds -- during their lifetime. The design longevity of a transport is upward of 40,000 flight hours whereas high-performance military aircraft have a design life of some 6,000 to 8,000 flight hours.
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From page 6... ...
For civil aircraft, structural weight savings can be translated into reduced direct operating costs resulting in lower passenger seat-mile or cargo ton-mile costs. Structural integrity directed at providing greater absolute safety is another evolving factor that requires increased attention to design detail.
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From page 7... ...
But these factors are not the same. The committee found other significant technical inhibitors to the use of advanced composites, inhibitors that can be overcome by basic research and technology development.
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From page 8... ...
There is an important role for NASA and the other government agencies to play in providing resources for needed R&T, in coordinating the attack on the factors that inhibit the beneficial application of composites and in assisting the United States in retaining a leadership role in aeronautical systems development and sales. Regarding the role of government in future technology development, the committee agrees with earlier studies that the government has a vital role in aeronautical R&T, including advanced composite material for aircraft structures.*
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From page 9... ...
Advanced organic composites have been and will continue to be used to improve aircraft range and takeoff gross weight through weight saving. A lighter structure permits the addition of fuel for greater range or airplane downsizing to achieve the same range and payload or to allow new capability.
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From page 10... ...
for composites comparable to linear elastic fracture mechanics for metals, (e) a lack of verified methodologies, based on the physics of filamentary composite structural behavior; composite designers are not able at this this time to design with the same degree of confidence for, longevity, damage tolerance, durability, and other aspects of structural integrity including fracture as they can with metals; as
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From page 11... ...
11. Technology Application -- The technology in this study, while restricted to advanced organic composites in support of the subsonic national aeronautics goal, will support the other national aeronautical goals, the supersonic cruiser, and the trans atmospheric vehicle.
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