Final Exam for IET 365 questions well
answers graded A+
Resin/Matrix - ANS ✔the material that bounds the fibers together, and distributes the stress to
the fibers.
The four Primary Functions of a Resin/Matrix - ANS ✔-Transfer of stress from fiber to fiber
-Maintain fibers orientation
-Prevent fibers from abrading each other
-Gives environmental Resistance (Protects)
Reinforcements - ANS ✔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 - ANS ✔-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 - ANS ✔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 - ANS ✔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 - ANS ✔a stage - Liquid
b stage -Gel
c stage - Crosslinked
two parameters needed for pre-pregs - ANS ✔Heat -
Pressure -
Advantages pf Pre-pregs - ANS ✔very clean
correct fiber-to-resin ratio
generally stronger than wet lay-up because of less resin used.
disadvantages of Pre-pregs - ANS ✔-costly
-heat is required to cure
-material needs to be kept frozen
Fiberglass (glass) - ANS ✔Made from strands of molten glass,which are then spun together and
woven into cloth
Advantages of fiberglass - ANS ✔-low cost compared to other types of fibers
- Readily available
-[good] tensile
-[good] shear strength
answers graded A+
Resin/Matrix - ANS ✔the material that bounds the fibers together, and distributes the stress to
the fibers.
The four Primary Functions of a Resin/Matrix - ANS ✔-Transfer of stress from fiber to fiber
-Maintain fibers orientation
-Prevent fibers from abrading each other
-Gives environmental Resistance (Protects)
Reinforcements - ANS ✔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 - ANS ✔-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 - ANS ✔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 - ANS ✔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 - ANS ✔a stage - Liquid
b stage -Gel
c stage - Crosslinked
two parameters needed for pre-pregs - ANS ✔Heat -
Pressure -
Advantages pf Pre-pregs - ANS ✔very clean
correct fiber-to-resin ratio
generally stronger than wet lay-up because of less resin used.
disadvantages of Pre-pregs - ANS ✔-costly
-heat is required to cure
-material needs to be kept frozen
Fiberglass (glass) - ANS ✔Made from strands of molten glass,which are then spun together and
woven into cloth
Advantages of fiberglass - ANS ✔-low cost compared to other types of fibers
- Readily available
-[good] tensile
-[good] shear strength
