AMT 113 QUESTIONS WITH VERIFIED ANSWERS
Collodion - Answers - Cellulose nitrate used as a film base for certain aircraft dope
Monocoque - Answers - A single shell type of aircraft structure in which all of the flight
loads are carried in the outside skin of the structure
Plastics - Answers - Generic name for any organic material produced by polymerization
Composite advantage over metal - Answers - Light weight, stronger, more rigid, better
able to withstand the sonic vibration.
Roving - Answers - A lightly twisted roll or strand of fibers.
Composite structure - Answers - High strength fibers oriented in the proper direction to
withstand stress.
Two basic categories of composite materials - Answers - -reinforcing material: consist of
fiber that may be made into tapes, woven into a fabric..
-matrix: used in composite construction to bond the fibers together.
Fiberglass
Two types of glass - Answers - Drawn from molten glass and spun together into threads
and woven into a shine.
-E-glass (E-electrical) has high electrical strength used for most nonaviation application
-S-glass (S-structural) stronger, tougher, and stiffer than E-glass. Used in application
where it's superior quality outweigh its higher cost.
Kevlar - Answers - -yellow color and is lightweight, strong, flexible, excellent resistance
to chemicals associated with aircraft operations.
-DuPont Company registered trade name
Major advantage of Kevlar - Answers - Flexibility under load & its ability to withstand
impact, shock, & vibration
-usually used for helicopter rotor blades
Graphite/Carbon - Answers - Extremely strong for its weight & is very stiff.
Why special care when bonding Graphite to aluminum alloy component? - Answers -
Because contact with graphite is likely to cause the aluminum alloy to corrode.
Fiber orientation - Answers - -wood is weak across its grain, but strong parallel to it.
-composite material major strength and stiffness is parallel to its fibers.
, Unidirectional fabric - Answers - All of the major fibers running in the same direction
-not woven
Aeroelastic tailoring - Answers - Design of aerodynamic surface whose strength &
stiffness are matched to the aerodynamic loads that will be imposed upon it.
Warp thread - Answers - Threads that run the length of the roll of fabric, parallel to the
selvage edge.
-usually stronger than fill thread
Plain-weave fabric - Answers - Each warp thread passes over one fill thread and under
the next.
-typically has the same strength in both warp and fill
Satin-weave fabric - Answers - The warp threads pass under one fill thread over several
more.
-used when lay up must be made over complex shapes.
Bidirectional fabrics - Answers - Made by interlocking fill threads with the warp threads.
Most generally used weaves - Answers - Plain weave & various type of satin weaves
Crowfoot satin:-warp thread passes under 1 fill and over 3.
Five-harness satin:- under 1 fill and over 4.
Eight-harness satin-over 1 fill thread and under seven.
Fill thread - Answers - Run across the width of the fabric.
-often called woof, weft
Hybrids
-most popular hybrid composites - Answers - Composed of different types of fibers
woven together for special characteristics
-Kevlar & Graphite
Two basic types of resins - Answers - Thermoplastic resin:-becomes soft when heated
& hardens when cooled.
-thermosetting resin:- once hardened by heat, can not be soften by being heated again
2 basic thermosetting resins - Answers - Polyester resin:-used as a metrix for much of
fiberglass used in composite construction.
Epoxy resin-
Polyester resin two part materials - Answers - A resin & a catalyst
Epoxy two part material - Answers - Resin and catalyst
Collodion - Answers - Cellulose nitrate used as a film base for certain aircraft dope
Monocoque - Answers - A single shell type of aircraft structure in which all of the flight
loads are carried in the outside skin of the structure
Plastics - Answers - Generic name for any organic material produced by polymerization
Composite advantage over metal - Answers - Light weight, stronger, more rigid, better
able to withstand the sonic vibration.
Roving - Answers - A lightly twisted roll or strand of fibers.
Composite structure - Answers - High strength fibers oriented in the proper direction to
withstand stress.
Two basic categories of composite materials - Answers - -reinforcing material: consist of
fiber that may be made into tapes, woven into a fabric..
-matrix: used in composite construction to bond the fibers together.
Fiberglass
Two types of glass - Answers - Drawn from molten glass and spun together into threads
and woven into a shine.
-E-glass (E-electrical) has high electrical strength used for most nonaviation application
-S-glass (S-structural) stronger, tougher, and stiffer than E-glass. Used in application
where it's superior quality outweigh its higher cost.
Kevlar - Answers - -yellow color and is lightweight, strong, flexible, excellent resistance
to chemicals associated with aircraft operations.
-DuPont Company registered trade name
Major advantage of Kevlar - Answers - Flexibility under load & its ability to withstand
impact, shock, & vibration
-usually used for helicopter rotor blades
Graphite/Carbon - Answers - Extremely strong for its weight & is very stiff.
Why special care when bonding Graphite to aluminum alloy component? - Answers -
Because contact with graphite is likely to cause the aluminum alloy to corrode.
Fiber orientation - Answers - -wood is weak across its grain, but strong parallel to it.
-composite material major strength and stiffness is parallel to its fibers.
, Unidirectional fabric - Answers - All of the major fibers running in the same direction
-not woven
Aeroelastic tailoring - Answers - Design of aerodynamic surface whose strength &
stiffness are matched to the aerodynamic loads that will be imposed upon it.
Warp thread - Answers - Threads that run the length of the roll of fabric, parallel to the
selvage edge.
-usually stronger than fill thread
Plain-weave fabric - Answers - Each warp thread passes over one fill thread and under
the next.
-typically has the same strength in both warp and fill
Satin-weave fabric - Answers - The warp threads pass under one fill thread over several
more.
-used when lay up must be made over complex shapes.
Bidirectional fabrics - Answers - Made by interlocking fill threads with the warp threads.
Most generally used weaves - Answers - Plain weave & various type of satin weaves
Crowfoot satin:-warp thread passes under 1 fill and over 3.
Five-harness satin:- under 1 fill and over 4.
Eight-harness satin-over 1 fill thread and under seven.
Fill thread - Answers - Run across the width of the fabric.
-often called woof, weft
Hybrids
-most popular hybrid composites - Answers - Composed of different types of fibers
woven together for special characteristics
-Kevlar & Graphite
Two basic types of resins - Answers - Thermoplastic resin:-becomes soft when heated
& hardens when cooled.
-thermosetting resin:- once hardened by heat, can not be soften by being heated again
2 basic thermosetting resins - Answers - Polyester resin:-used as a metrix for much of
fiberglass used in composite construction.
Epoxy resin-
Polyester resin two part materials - Answers - A resin & a catalyst
Epoxy two part material - Answers - Resin and catalyst
