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MMET 206 Exam II- Questions & Answers
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MMET 206 Exam II- Questions & Answers
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MMET 206 Exam II- Questions &Answers
What are composite materials? Correct Ans-reinforcing material and matrix material
Reinforcing material can come in the form of Correct Ans-particles, fibers or fabric sheet
What are the most common types of structures in composites? Correct Ans-fibrous and
particulate
What are the basic configurations of composites? Correct Ans-reinforcing material is in a
dispersed phase and matrix material is in a continuous phase
What are the reasons that composites reduce weight? Correct Ans--better strength/stiffness to
weight ratio
-material's property can be tailored
A unidirectional Layup is Correct Ans-orthotropic
A multidirectional layup is Correct Ans-quasi-isotropic
What are the three types of composites? Correct Ans-CMC
MMC
,PMC
What is the most common type of composite? Correct Ans-PMC
What are the two types of polymer matrix composites? Correct Ans-fibrous and particulate
CMC matrix materials Correct Ans-carbon, silicon carbide (SiC)
CMC reinforcing materials Correct Ans-carbon or silicon carbide fibers
Rule of Mixtures Correct Ans-Ecomposite= (Efiber)(Vfiber)+(Ematrix)(Vmatrix)
What are the forms that reinforcing fibers come in? Correct Ans-filament, tow, roving, fabric,
chopped fiber, mat
Resins (Polymer matrix) for thermosets Correct Ans--epoxy
-polyester
-vinyl ester
How do glass fiber, carbon fiber and kevlar fiber compare in cost? Correct Ans-Carbon fiber
is most expensive, glass fiber is least expensive
, What is the most commonly used reinforcing fibers? Correct Ans-glass fibers
Specific Strength Correct Ans-tensile strength/density
Unidirectional Composites have a specific strength _____ Correct Ans-4-5 times that of
metals
Quasi-isotropic composites have a specific strength _____ Correct Ans-2 times that of metals
What is the specific strength of carbon fibers? Correct Ans-10 times that of metals
Properties required for a reinforcing fiber? Correct Ans-high strength, high stiffness, low
density
Aircraft wing structures require Correct Ans-high strength and high stiffness
Pyrolysis Correct Ans-the chemical decomposition of organic materials by heating in the
absence of oxygen (in inert gas)
PAN Correct Ans-polyacrylonitrile
-also called acrylic fibers
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