UNIVERSITY OF HYDERABADSCHOOL OF ENGINEERING SCIENCES AND TECHNOLOGY

COMPOSITE MATERIALS IN AEROSPACE APPLICATIONS

PRESENTATION BY SURESH BEERA

12ETMM11 I M.Tech

MATERIALS ENGINEERING

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Introduction to Composite Materials Classification of composite Application of composites in aerospace Advantages & Disadvantages of composites Conclusions References

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What are composite materials (definition) ?

Composite material is a material composed of two or more distinct phases(matrix phase and dispersed phase) which are chemically & physically different

Composites are used because overall properties of the composites are superior to those of the individual components

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The primary phase, having a continuous character , is called matrix. Matrix is usually more ductile and less hard phase. It holds the dispersed phase and shares a load with it.The second phase (or phases) which is embedded in the matrix is called dispersed phase. Dispersed phaseis usually stronger than the matrix, therefore it is called reinforcing phase

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Composites

Particulate reinforced Fiber reinforced

Structural

Continuous Discontinuous

Laminates SandwichPanels

LargeParticle

DispersionStrengthened

Aligned Random

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The following are some of the reasons why composites are selected for aerospace applications:

• High strength to weight ratio (low density high tensile strength)

• High creep resistance

• High tensile strength at elevated temperatures

• High toughness

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Thermoset resins ◦ polyester , Epoxy,Phenol,Polyimide

Thermoplastics PolyPhenyleneSulifide(PPS), PolyEtherEtherKetone(PEEK), PolyEtherimide (PEI)

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Metals (aluminium, titanium etc.) Glass Ceramics

Hybrid◦ Carbon aramid reinforced epoxy◦ Glass Carbon reinforced epoxy

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The Boeing 777 is a long-range wide- body twin-engine jet airliner manufactured by Boeing commercial airplanes. It is the world's largest twinjet and has a capacity of over 300 passengers, with a range of 5,235 to 9,380 nautical miles (9,695 to 17,370 km) .12% composites are used

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The Boeing 787 Dreamliner is a long-range, mid-size wide-body, twin- engine jet airliner developed by Boeing commercial airplanes. Each 787 containsApproximately 32,000 kg of carbon fiber reinforced plastic (CFRP), made with 23 tons of carbon fiber. Carbon fiber composites have a higher strength-to-weight ratio than traditional aircraft materials, and help make the 787 a lighter aircraft.Composites are used on fuselage, wings, tail, doors, and interior.

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composite materials will play an increasingly significant role in aerospace application

B787,A350-XWB used more than 50% composite materials

With their unique combination of properties such as low weight, high strength, low flammability, smoke density and heat release, non-toxicity and durability, composites are ideal for many aerospace applications, both for interior and exterior components.

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Mainly from Reference 1: “Low-cost composite materials and structures for aircraft applications”, Doe R.B., Starnes, J.H., Holzwarth, R.C.,May 2001.

Callister’s Materials science andengineering,wiley india publication

Composite materials for aerospace applications.P D MANGALGIRI Aeronautical Development Agency, Vimanapura PO, Bangalore 560017, India

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