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ENTC 206 Lab Practical
Terms in this set (71)
American Society for Testing and Materials
International Organization for Standardization
What is a resistor made of?
Al2O3 + metal or metal oxide layer
What is a knife/peeler made of?
Al2O3 or (SiC or Si3N4)
What is aerogel?
good thermal insulator
What is an ignitor?
made of Si3N4 or SiC
high electrical conductivity at high temp.
What is Sand paper?
What is a shiny finish bearing made of?
What is a dull finish bearing made of?
What is safety glass made of?
What did acetone dissolve?
What did water dissolve?
Recycling Al cans is important because we can save ________ of energy to make Al from the recycled Al
What is a tensile test?
a good measure of mechanical response of a plastic sample subjected to tensile loading
How do you calculate young's modulus?
slope on graph - stress/strain
What are the units of young's modulus?
When tensile testing, the _________ required to move the specimen under a constant ________ is recorded
force, extension rate
What are the units for Pascal (Pa)?
WHY the impact test?
the results can be used to compare materials relative toughness
What is toughness?
resistance to fracture when a material is stressed
How do you perform the impact test?
measures a material's resistance to impact
measures the energy absorbed by a material during a high strain rate fracture
What are the 2 main methods used for impact test?
Izod and Charpy
What is the Izod Test?
the goal is to observe how material are tested under impact stress
V notch shape
(we used this test in lab)
What is the Charpy Test?
U,V, of keyhole notch
What is the difference between the Izod and Charpy tests?
lies in the way that the impact load is applied relative to the position of a machined notch
What is the similarity between the Izod and Charpy tests?
ASTM standards exist for both tests
both make use of a pendulum
both record the amount of energy (loss of PE) absorbed by the specimen
The impact test results depend on 3 main factors:
Temperature in an impact test:
below a certain critical temperature, the failure observed is brittle (most of the time)
above this temperature, the failure is ductile
What is hardness?
a material's ability to resist a localized permanent deformation
What are the different hardness scales?
What is the standard instrument used for hardness measurement of polymers, plastics, and elastomers?
What is Shore A used for?
softer plastics (rubbers and elastomers)
What is Shore D used for?
harder materials like hard rubber and plastics
Out of the polymers tested in lab, which had the highest impact strength?
Out of the polymers tested in lab, which had the second highest impact strength?
What polymer would be the best choice for safety glasses?
PC bc transparent
Why is a range of hardness values given in CES instead of a single value?
because you could get different values at different times depending on the exact pressure you press the durometer
How do you measure stress?
force/cross sectional area
What is the polymer used for a moisture barrier?
What is the polymer used for oxygen barrier?
EVOH (ethylene vinyl alcohol)
Name a monomer of olefins.
What are types of thermal properties?
melting temperature, thermal conductivity, thermal expansion coefficient, glass transition temperature, melt index, heat deflection temp
What are thermoplastics?
can easily be recycled and remolded
have flexible linear or branched chains
2 types: engineering and commodity
What are thermosets?
cross linked primary bonds and a rigid 3D network
stiffer and more brittle
better creep resistance
contain catalysts that can be change the material at molecular levels
What is compression molding?
used for thermoset polymers
polymer thermoset dough placed into a cavity, close dies, remove flash on sides
What did we use in lab for compression molding and what did we make?
thermoset - bakelite (phenol formaldehyde)
we made a coaster
What is injection molding?
only used for thermoplastic polymers
inject plastic granules into a hopper where they fall into the injection molding machine, heat the granules and let them cool and separate the mold
What did we use in lab for injection molding and what did we make?
Thermoplastic - PP
we made a keychain
What is thermoforming?
only used for thermoplastic plastic materials in the form of thin sheets
What are the steps involved when compression molding a thermoset polymer?
cross-linking & polymerization
What are important parameters in compression molding?
In the thermoforming demonstration, the plastic raw material was in what form?
What are ceramics?
nonmetallic inorganic materials formed by taking mixtures of clay, powder and water and saping then fire at high temp
What types of bonds to ceramics have?
covalent or ionic bonds
strong, carries most of the load
glass fiber, kevlar, carbon uniaxial, carbon biaxial
high specific strength materials
holds everything together
transfers load from fiber to fiber
examples of resins
epoxy resin, vinyl ester, polyester
examples of fibers:
glass, carbon, kevlar
fiber (reinforcement) comparison
very high strength
very high stiffness
very low density
carbon fibers have ______ time specific strength of metals
defects of composite laminate
name the four fibers used in lab for composite lay up
What matrix material did we use in lab?
safety shields, goggles
2 - HDPE 4-LDPE
toys and milk bottles
packaging film and blow molded bottles
general polymer engineering
Toys, mirrors, lenses
This set is often in folders with...
ENTC 206 Lab Practical
MMET 206 Lab Practical
MMET 206 Test 2
MMET 206 Final
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