Composite Basics MS-126 Flashcards
What is a composite material?
Two or more chemically distinct materials, when combined have improved properties over individual materials. Composite could be natural or synthetic.
Composites are combination of two materials in which one of the material is called the _______ ________.
reinforcing phase
In the form of fibers, sheets or particles and is embedded in the other material is called the _____ -______.
matrix phase
Typically, ____ ______ are strong with low densities while the matrix is usually a ductile or tough material.
reinforcing material
______ _____ is two inherently different materials that when combined together produce a material with properties that exceed the constituent materials.
composite material
Typically, reinforcing materials are strong with low densities, while the matrix is usually a ____ or _____ material.
ductile or tough material
If composite is designed and fabricated correctly, it combines the strength of the reinforcement with the toughness of the ____ to achieve a combination of desirable properties not available in any single conventional materials.
matrix
Glass, Carbon, organic, boron, ceramic, metallic are all ____ ____.
reinforcement fibers
polymers, metal, ceramics are all ____ ______.
matrix materials
bonding surface is _____.
interface
weight of aramid fibers are the lightest at ___ -____ g/cc
1.3-1.4 g/cc
carbon _____ g/c
1.79 g/cc
Fiberglass is the heaviest ____ g/cc.
2.4 g/cc
strength carbon is is the strongest at ____ - ____ ksi
600-800 ksi
Fiberglass ____ - ____ ksi
400-600 ksi
aramids _____ ksi
400 ksi
Impact resistance Kevlar is the _____. Next is fiberglass, then carbon.
toughest
Carbon is the stiffest at ___ - ____ msi
30-40 msi
Aramid stiffness __ msi
14 msi
Fiberglass stiffness ___ -___ msi
10-13 msi
_____ is cost effective
fiberglass
______ is the least cost effective.
carbon
Series of interlaced yarns at 90 degrees to each other
woven
series of interloped yarns
knit
series of intertwined, spiral yarns
braided
oriented fibers either mechanically, chemically, or thermally bonded
nonwoven
___ goes longitudinal
End
___ goes horizontal
pick
X axis _____ ____>
fill direction
Y axis ____ _____
warp direction
Plain weave offers ____ _____, and ______ _____
fabric integrity, and dimensional stability
satin 5hs weave offers ___ ____ and _____ _____ of fiber properties.
smoother face, improved translation of fiber properties
2x2 Twill weave offers
excellent drape-ability, conformity
non-crimp weave offers
minimum crimp in yarns, dimensional stability
A ___ consists of two sets of yarn, which are hectically intertwined. Resulting structure is oriented to the longitudinal axis of the ___.
brain
Types of braids
diamond brain, regular brain, Hercules braid
A system of longitudinal yarns can be introduce which are held in place by the braiding yards. These yarns will ad dimensional stability, improve tensile properties, stiffness, etc. What am I?
triaxial yarns
concept of composites is that the load is applied over a larger surface area of the _____.
matrix
matrix then transfers the load to the _______, which being stiffer, increases the strength of the composite.
reinforcement
about ____ % of all composites are produced are comprised of glass fiber and either polyester or vinylester resin.
90
_____ ____ composites offer higher modulus of elasticity, ductility and resistance to elevated temperatures than polymer matrix. but are heavy and difficult to process.
metal matrix
____ matrix composites are used in applications where resistance to high temp and corrosive environment is designer CMC are strong and stiff by they lack toughness.
ceramic matrix composites
____ are heterogeneous
composites
____ are highly anisotropic
composite
