AMCR COMPOSITES Flashcards
is a material composed of solid materials of carry-load that
are contained in a material much weaker.
Composite Material
is often referred to as the stronger material and the weaker
material is usually referred to as the matrix.
Reinforcement
The reinforcement provides the requisite ____________ that helps to
sustain the structural load.
Strength and Stiffness
5 Types of Fiber
Fiber Glass, Kevlar, Carbon / Graphite, Boron, Ceramic
Types of Fiberglass
Electrical glass or E-glass, S-glass, S2-glass
is identified as such for electrical applications. It has
high resistance to current flow and is made from borosilicate glass.
Electrical glass or E-glass
identify structural fiberglass that have a higher strength
than E-glass and is produced from magnesia-alumina-silicate.
S-glass and S2-glass
Advantages of fiberglass
○ lower cost than other
composite materials,
○ chemical or galvanic
corrosion resistance, and
○ electrical properties
(fiberglass does not conduct
electricity).
has a white color and is available as a dry fiber
fabric or prepreg material.
Fiberglass
are light weight, strong,
and tough.
Aramid fibers
DuPont’s name for aramid fibers.
Kevlar®
Two types of Aramid fiber are used in the aviation industry.
Kevlar® 49, Kevlar® 29
A Kevlar that has a high stiffness
Kevlar 49
A Kevlar that has a low stiffness
Kevlar 29
An advantage of aramid fibers is their
high resistance to impact damage
The main disadvantage of aramid
fibers is their general
weakness in compression and hygroscopy
are very stiff and strong, 3 to 10 times stiffer than
glass fibers. It is used for structural aircraft applications, such as floor beams,
stabilizers, flight controls, and primary fuselage and wing structure.
Carbon and Graphite Fibers
Advantages of Carbon and Graphite Fibers
high strength and corrosion resistance.
Disadvantages of Carbon and Graphite Fibers
lower conductivity than aluminum
are very stiff and have a high tensile and compressive strength. The fibers
have a relatively large diameter and do not flex well. Also. these are used to repair
cracked aluminum aircraft skins, because the thermal expansion of this is close
to aluminum and there is no galvanic corrosion potential.
Boron
are used for high-temperature applications, such as turbine
blades in a gas turbine engine.
Ceramic Fibers
The ceramic fibers can be used to temperatures up
to?
2,200 °F
Types of Matrix
Metal Matrix Composites, Ceramic Matrix Composites, Polymer Matrix Composites
are composed of a metallic matrix
(aluminum, magnesium, iron, cobalt, copper) and a dispersed ceramic (oxides,
carbides) or metallic (lead, tungsten, molybdenum) phase.
Metal Matrix Composites (MMC)
are composed of a ceramic matrix and
embedded fibers of other ceramic material (dispersed phase).
Ceramic Matrix Composites (CMC)
are composed of a matrix from thermoset
(Unsaturated Polyester (UP), Epoxy (EP)) or thermoplastic (Polycarbonate
(PC),Polyvinylchloride, Nylon, Polysterene) and embedded glass, carbon, steel
or Kevlar fibers (dispersed phase).
Polymer Matrix Composites (PMC)
a generic term used to designate the polymer.
Resin
Types of Resin
Thermoset, Thermoplastic
are the most diverse and widely used of all man-made
materials. They are easily poured or formed into any shape, are compatible with
most other materials, and cure readily (by heat or catalyst) into an insoluble solid.
These resins are also excellent adhesives and bonding agents.
Thermosetting Resin
can be softened repeatedly by an increase of temperature
and hardened by a decrease in temperature. Processing speed is the primary
advantage of thermoplastic materials. Chemical curing of the material does not
take place during processing, and the material can be shaped by molding or
extrusion when it is soft.
Thermoplastic Resins