lecture notes MdC2014.pdf
COMPOSITE MATERIALS. APPLICATION
Composite material= combination of two or more materials with significantly different
behavior on a macroscopic scale i e a material with two or more distinct phases namely
behavior on a macroscopic scale, i.e. a material with two or more distinct phases, namely
the reinforcements and matrices Not like an alloy, like e.g. Ti6AlV4, or Al 7050!
Wing Skin, Front Fuselage, Control Surface Fin & Rudder, Access Doors, Under Carriage Doors, Engine Cowlings,
M i Torsion
T i Box,
F l Tanks,
T k Rotor
R t Blades,
Bl d Fuselage
B d off Helicopters,
H li t
Dishes, Solar Booms and Solar Arrays, etc.
Horizontal and Vertical Tail, Stiffening Spars, Ribs and Longerons, etc.
Nose Cones, Wing Root, Fairings, Cockpit and Fuselage of Helicopters, Motor Casings, Pressure Bottles, Propellant
Reinforcements can be: particulates (e.g. SiC), whiskers or fibers, embedded in continuous
phases („matrices“), here: restriction to composites with long fibers („advanced“
composites), often abbreviated as FRP (fiber reinforced plastics)
Fiber, monofilament: Primary reinforcement, short (= staple) or long (= continuous), fiber
„size“ Ø =7 ...150 μ
i “ Ø 7 150
Tanks, Other Pressurised Systems, etc.
Floor Boards, Interior Decorative Panels, Partitions, Cabin Baggage Racks and Several Similar Applications.
Folded Plates of Various Forms, Both Synclastic and Anticlastic Shells, Skeletal Structures, Walls and Panels,
Matrices: polymers, metals or ceramics; we shall consider polymeric matrices
Doors, Windows, Ladders, Staircases, Chemical and Water Tanks, Cooling Towers, Bridge Decks, Antenna Dishes,
In general, the reinforcements are much stronger and stiffer than the matrix and matrices
are more ductile than fibers
Marine and Mechanical
Ship and Boat Hulls, Masts, Automobile Bodies, Frames and Bumpers, Bodies of Railway Bogeys, Drive shafts,
g Rods,, Suspension
, Instrument Panels.
Lamina ply laminae: unidirectional (UD) layer is basic element thicknesses (in mm) 0 125
Lamina, ply, laminae: unidirectional (UD) layer, is basic element, thicknesses (in mm) 0.125
(E‐Glass), 0.13 (Kevlar, HR carbon)
Skis, Ski Poles, Fishing Rods, Golf Clubs, Tennis and Badminton Rackets, Hockey Sticks, Poles(Pole vault),
Bicycle Frames, etc.
Laminate: a stack of two or more UD‐laminae with equal or different orientations
Laminate: a stack of two or more
with equal or different orientations
(„multiaxial“), defined by a stacking sequence