ME 3701 Materials LAB FINAL Exam/
Updated 2025
Thermoplastic - CORRECT ANSWER-long coiling chains NOT cross linked
low strength, low modulus, soften when heated and harden when cooled in reversible
manor
Thermosetting - CORRECT ANSWER-cross linked chains, hard after heating and do
not soften when reheated
strong and stiff
NOT recyclable
Elastomers - CORRECT ANSWER-can forego significant amount of reversible plastic
deformations
long chains NOT crosslinked
generally return to original shape
Ductile VS Brittle - CORRECT ANSWER-more energy is allowed to be absorbed in
ductile because it is allowed to strain more
Brittle-little to no plastic deformation with low absorption
Etching - CORRECT ANSWER-placing acid on the surface to see the various phases
highlights micro structure
removes residue after polishing
Why apply a minor load in Rockwell Test - CORRECT ANSWER-It flattens the surface
and ensures that no debris can cause errors in the reading
Polymers - CORRECT ANSWER-are highly molecular weight materials made of simple
organic compounds
SEM - CORRECT ANSWER-Scanning Electron Microscope
Types of Testing and what they test for - CORRECT ANSWER-Rockwell=Hardness
Charpy & Izod=Toughness
Jominy-End Quench=Harden-ability
Yield Strength - CORRECT ANSWER-stress at which a specified limiting permanent set
characterizes beginning of plastic deformation
Ultimate or Tensile Strength - CORRECT ANSWER-dividing the max load sustained by
the original cross sectional area
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