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10me34-Mechanics-of-materials-->View question

List application of composite materials in Aerospace.

elements of mechanical engineering.


Asked On2017-06-14 09:22:06 by:prajwalamv

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arunwebber

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Weight is everything when it comes to heavier-than-air machines, and designers have striven continuously to improve lift to weight ratios since man first took to the air. Composite materials have played a major part in weight reduction, and today there are three main types in use: carbon fiber-, glass- and aramid- reinforced epoxy.; there are others, such as boron-reinforced (itself a composite formed on a tungsten core).
Composites are versatile, used for both structural applications and components, in all aircraft and spacecraft, from hot air balloon gondolas and gliders to passenger airliners, fighter planes, and the Space Shuttle. Applications range from complete airplanes such as the Beech Starship to wing assemblies, helicopter rotor blades, propellers, seats and instrument enclosures.
The types have different mechanical properties and are used in different areas of aircraft construction. Carbon fiber, for example, has unique fatigue behavior and is brittle, as Rolls-Royce discovered in the 1960's when the innovative RB211 jet engine with carbon fiber compressor blades failed catastrophically due to birdstrikes.
Whereas an aluminum wing has a known metal fatigue lifetime, carbon fiber is much less predictable (but dramatically improving every day), but boron works well (such as in the wing of the Advanced Tactical Fighter).
Aramid fibers ('Kevlar' is a well-known proprietary brand owned by DuPont) are widely used in honeycomb sheet form to construct very stiff, very light bulkhead, fuel tanks, and floors. They are also used in leading- and trailing-edge wing components.

Answerd on:2017-06-26 Answerd By:Aparna-Dasgupta

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