Mechanics of aircraft materials 4 case study cdio

Mechanics of Aircraft Materials

Dr Ly Hung Anh

Case Study

Department of Aerospace Engineering – Faculty of Transportation Engineering

Airbus training document

Three advantages of composite material : 1 Light weight

2 Corrosion resistance

3 A large impact on strength

Composites in the Aircraft Industry:

http://www.appropedia.org/Composites_in_the_Aircraft_Industry

The weight of aircraft components made of composite materials are reduced by approximately 20%

(Composites in the Aircraft Industry:

http://www.appropedia.org/Composites_in_the_Aircraft_Industry)

Composite materials :

1 Core materials: Polystyrene, polyurethane (urethane) or polyvinyl chloride (PVC)

2 Reinforcement materials: fiberglass, Kevlar, and carbon fiber (graphite).

3 Resins: Vinyl Ester, Epoxy.

Basics of Composite Construction:

http://www.exp-aircraft.com/library/alexande/composit.html

Aluminium alloy versus Steel :

1 Aluminium alloys typically have an elastic modulus of about 70 GPa, which is about one-third of the elastic modulus of most kinds of steel and steel alloys Therefore, for a given load, a component or unit made of an aluminium alloy will experience a greater elastic deformation than a steel part of the identical size and shape.

2 In general, stiffer and lighter designs can be achieved with aluminium alloys than is feasible with steels.

3 An important structural limitation of aluminium alloys is their lower fatigue strength compared to steel.

Aluminium alloy : The most important cast aluminium alloy system is Al-Si,where the high levels of silicon (4.0% to 13%) contribute to give good castingcharacteristics Aluminium alloys are widely used in engineering structuresand components where light weight or corrosion resistance is required.

http://www.technovelgy.com/ct/Science-Fiction-News.asp?NewsNum=2493

Composite in Boeing 787

http://www.1001crash.com/index-page-composite-lg-2.html