Final Exam for IET 365 || with 100% Errorless Answers.
Resin/Matrix correct answers the material that bounds the fibers together, and distributes the
stress to the fibers.
The four Primary Functions of a Resin/Matrix correct answers -Transfer of stress from fiber to
fiber
-Maintain fibers orientation
-Prevent fibers from abrading each other
-Gives environmental Resistance (Protects)
Reinforcements correct answers Material used to strengthen the resin/Matrix; at least 50 times
stronger, and 25-150 times more rigid than the resin/matrix
Advantages of wet lay-up correct answers -Can be cured at room temperature (low) , or high
temp.
-Can be cured with or without pressure.
-Can store fibers and resin at room temperature.
Disadvantages of wet lay-ups correct answers 1- Messy, Messy, Messy
2- Not accurate fiber-to-ratio
3-Longer lay-up process that prepregs
4-More Skills needed than prepregs
a-Reason Quality
b- Encapsulations/ voids
c- Orientation of fibers
d- Distortion of fibers
Pre-pregs correct answers the practice of mixing resin and reinforcement and effecting partial
cure before use of shipment to user (usually requires to be frozen storage (0 f°))
three stages for all thermoset resins correct answers a stage - Liquid
b stage -Gel
c stage - Crosslinked
two parameters needed for pre-pregs correct answers Heat -
Pressure -
Advantages pf Pre-pregs correct answers very clean
correct fiber-to-resin ratio
generally stronger than wet lay-up because of less resin used.
disadvantages of Pre-pregs correct answers -costly
-heat is required to cure
-material needs to be kept frozen
, Fiberglass (glass) correct answers Made from strands of molten glass,which are then spun
together and woven into cloth
Advantages of fiberglass correct answers -low cost compared to other types of fibers
- Readily available
-[good] tensile
-[good] shear strength
disadvantages of fiberglass correct answers -Lower impact strength compared to other fibers
- heavier than the other types of fibers
Types of fiberglass correct answers - E-glass (eletrical glass)
- S-glass (structural glass)
- C-glass (chemical glass)
- A-glass "alkali glass"
- D-glass "dielectric glass"
E-glass properties correct answers -very high electrical resistance
-[good] strength
- inexpensive
-approximately 90% of fiberglass is E-glass
S-glass properties correct answers -40% stronger in tensile strength than E-glass
-high temp resistance
-another version: s2-Glass - Less expensive
C-Glass properties correct answers -Resistance to chemicals
- resistance to ultra-violet light
- (negative: produces an average product; another option is to use E-glass or S-glass with Vinyl
Ester resin)
Aramid (Kevlar) correct answers A strong organic yellow fiber with a high tensile strength-to-
weight ratio. (poly paraphenylene terephthalamide.)
Aramid (Kevlar) Advantages correct answers - high tensile strength-to-weight ratio (5x than
steal)
-high impact resistance
-extremely tough
-high flexibility
-high vibration resistance
-flame resistance
Aramid (Kevlar) Disadvantages correct answers -stretches when cut; makes cuts "fuzzy"
-[advantage] compression
-Hygroscopic - absorbs water
a. affects resin - causes resin deterioration
Resin/Matrix correct answers the material that bounds the fibers together, and distributes the
stress to the fibers.
The four Primary Functions of a Resin/Matrix correct answers -Transfer of stress from fiber to
fiber
-Maintain fibers orientation
-Prevent fibers from abrading each other
-Gives environmental Resistance (Protects)
Reinforcements correct answers Material used to strengthen the resin/Matrix; at least 50 times
stronger, and 25-150 times more rigid than the resin/matrix
Advantages of wet lay-up correct answers -Can be cured at room temperature (low) , or high
temp.
-Can be cured with or without pressure.
-Can store fibers and resin at room temperature.
Disadvantages of wet lay-ups correct answers 1- Messy, Messy, Messy
2- Not accurate fiber-to-ratio
3-Longer lay-up process that prepregs
4-More Skills needed than prepregs
a-Reason Quality
b- Encapsulations/ voids
c- Orientation of fibers
d- Distortion of fibers
Pre-pregs correct answers the practice of mixing resin and reinforcement and effecting partial
cure before use of shipment to user (usually requires to be frozen storage (0 f°))
three stages for all thermoset resins correct answers a stage - Liquid
b stage -Gel
c stage - Crosslinked
two parameters needed for pre-pregs correct answers Heat -
Pressure -
Advantages pf Pre-pregs correct answers very clean
correct fiber-to-resin ratio
generally stronger than wet lay-up because of less resin used.
disadvantages of Pre-pregs correct answers -costly
-heat is required to cure
-material needs to be kept frozen
, Fiberglass (glass) correct answers Made from strands of molten glass,which are then spun
together and woven into cloth
Advantages of fiberglass correct answers -low cost compared to other types of fibers
- Readily available
-[good] tensile
-[good] shear strength
disadvantages of fiberglass correct answers -Lower impact strength compared to other fibers
- heavier than the other types of fibers
Types of fiberglass correct answers - E-glass (eletrical glass)
- S-glass (structural glass)
- C-glass (chemical glass)
- A-glass "alkali glass"
- D-glass "dielectric glass"
E-glass properties correct answers -very high electrical resistance
-[good] strength
- inexpensive
-approximately 90% of fiberglass is E-glass
S-glass properties correct answers -40% stronger in tensile strength than E-glass
-high temp resistance
-another version: s2-Glass - Less expensive
C-Glass properties correct answers -Resistance to chemicals
- resistance to ultra-violet light
- (negative: produces an average product; another option is to use E-glass or S-glass with Vinyl
Ester resin)
Aramid (Kevlar) correct answers A strong organic yellow fiber with a high tensile strength-to-
weight ratio. (poly paraphenylene terephthalamide.)
Aramid (Kevlar) Advantages correct answers - high tensile strength-to-weight ratio (5x than
steal)
-high impact resistance
-extremely tough
-high flexibility
-high vibration resistance
-flame resistance
Aramid (Kevlar) Disadvantages correct answers -stretches when cut; makes cuts "fuzzy"
-[advantage] compression
-Hygroscopic - absorbs water
a. affects resin - causes resin deterioration
