Aircraft Structural Materials Flashcards

1
Q

How do you work harden a piece of metal?

A

By cold working the metal.

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2
Q

Describe the primary difference between a thermosetting and a thermoplastic resin.

A

A thermosetting resin doesn’t soften when heated and chars or burns rather than melting. Thermoplastic resins become soft and pliable when heated, and harden when cooled.

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3
Q

Explain how thermosetting and thermoplastic resins are used in modern aircraft.

A

Plexiglas is a thermoplastic resin commonly used for windshields and windows/ Thermosetting resins are most often used as the matrix material in composite structures.

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4
Q

Name one of the types of resin commonly used as a matrix material for aircraft composite laminates.

A

Polyester resin or Epoxy resin.

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5
Q

What are some of the materials that are commonly used as the reinforcing component in a composite structure?

A

Fiberglass, Aramid (Kevlar), Graphite (Carbon) fiber, linen, and paper.

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6
Q

What are the reasons that alloy steel that is responsive to heat treatment is usually less suitable for welding?

A

It may become brittle and lose its ductility in the area of the weld.

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7
Q

Give one advantage of the pre-preg (pre-impregnated) materials, other than saving time in the construction or repair of composite components.

A

1 - Pre-preg fabrics contain the correct amount of matrix.
2 - The matrix material evenly and completely permeates the reinforcing fibers.
3 - The matrix has the resin and hardener in the correct proportions.

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