Materials Science Exam #3 questions
well answered already passed
What is a composite? - ANS ✔A combination of 2 or more distinct materials that are artificially
made
Constituent phases must be __________ dissimilar and separated by distinct phase - ANS
✔chemically
What are the three classifications of composites? - ANS ✔particle-reinforced
fiber-reinforced
structural
What is an example of a particle-reinforced composite? How is it produced? - ANS ✔Concrete
Aggregate bound together with cement
What is reinforced concrete? - ANS ✔When steel rods are within the concrete and has similar
properties to those of concrete
Concrete is much stronger under ________ than _________. This is known as prestressed
concrete - ANS ✔compression, tension
What is the goal of a fiber reinforced material? - ANS ✔have a high strength per weight
_____>>_____ for continuous. What are the fibers like during this? - ANS ✔l, lc; the fibers are
aligned
, _____>>_____ for discontinuous. What are the fibers like during this? - ANS ✔lc,l; the fibers are
either aligned or random
What is a laminar composite? - ANS ✔2D sheets or panels that have high strength direction.
Layers are stretched to orientation of high strength varies
What are sandwich panels? What is their goal? what are they usually used in? - ANS ✔2 strong
outer sheets separated by core of lower strength and stiffness. to have a high specific strength.
aircrafts- light
What are the three classifications of phase transformations? - ANS ✔simple diffusion
dependent transformation, another diffusion dependent transformation, diffusion less
what is simple diffusion dependent transformation entail? - ANS ✔no change in either the
number of phases or composition of phases
What does another diffusion dependent transformation entail? - ANS ✔when there is a change
in phase composition and often number of phases
What does diffusion less entail? - ANS ✔when a metastable phase is produced
Course pearlite is produced by ______ cooling at a ______ temperature - ANS ✔slow, high
Fine pearlite is produced by ______ cooling at a ______ temperature - ANS ✔fast, low
_______ of the grain size and a ______ of the grain boundary area results in an increase of
strength - ANS ✔decrease, increase
well answered already passed
What is a composite? - ANS ✔A combination of 2 or more distinct materials that are artificially
made
Constituent phases must be __________ dissimilar and separated by distinct phase - ANS
✔chemically
What are the three classifications of composites? - ANS ✔particle-reinforced
fiber-reinforced
structural
What is an example of a particle-reinforced composite? How is it produced? - ANS ✔Concrete
Aggregate bound together with cement
What is reinforced concrete? - ANS ✔When steel rods are within the concrete and has similar
properties to those of concrete
Concrete is much stronger under ________ than _________. This is known as prestressed
concrete - ANS ✔compression, tension
What is the goal of a fiber reinforced material? - ANS ✔have a high strength per weight
_____>>_____ for continuous. What are the fibers like during this? - ANS ✔l, lc; the fibers are
aligned
, _____>>_____ for discontinuous. What are the fibers like during this? - ANS ✔lc,l; the fibers are
either aligned or random
What is a laminar composite? - ANS ✔2D sheets or panels that have high strength direction.
Layers are stretched to orientation of high strength varies
What are sandwich panels? What is their goal? what are they usually used in? - ANS ✔2 strong
outer sheets separated by core of lower strength and stiffness. to have a high specific strength.
aircrafts- light
What are the three classifications of phase transformations? - ANS ✔simple diffusion
dependent transformation, another diffusion dependent transformation, diffusion less
what is simple diffusion dependent transformation entail? - ANS ✔no change in either the
number of phases or composition of phases
What does another diffusion dependent transformation entail? - ANS ✔when there is a change
in phase composition and often number of phases
What does diffusion less entail? - ANS ✔when a metastable phase is produced
Course pearlite is produced by ______ cooling at a ______ temperature - ANS ✔slow, high
Fine pearlite is produced by ______ cooling at a ______ temperature - ANS ✔fast, low
_______ of the grain size and a ______ of the grain boundary area results in an increase of
strength - ANS ✔decrease, increase
