Non-Metallic Structures Quiz 8

List the names of the fibers used to reinforce composites

• Carbon fiber, glass fiber, ceramic, Kevlar, boron

• Polyurethane foam, Balsa, Honeycomb, thermoplastic

• Thermosetting resin, glass fibers, balsa, Kevlar

Which one of the above fibers

can be utilized in high heat areas?

• Kevlar

• Carbon fiber

• Ceramic

Curing of the matrix (resin) is accomplished with

• Time

• Pressure

• Time, heat and pressure

What is the minimum vacuum pressure required in a vacuum bag?

• 14.7 PSI

• 22” hg

• 20” hg

The best way to remove paint from a composite panel that is to be repaired, is?

• Pyrolytic paint removal

• Hand sanding

• Sand blasting

The simplest and most common damage inspection methods for composites is?

• Visual inspection

• Dye penetrant inspection

• Ultrasonic inspection

Superficial scars, scratches or abrasion can generally be repaired by?

• Sanding to a smooth cross section

• Applying one coat of resin catalyzed to cure at room temperature

• Applying a precured patch

Carbon or graphite fibers are?

• 3 to 10 times stiffer than glass fibers

• Electrically conductive, so do not need lightning protection

• Are heavier than fiberglass fibers

Epoxy resins are?

• Thermosetting resins

• Thermoplastic

• Not suitable for structural repair

Kevlar is a registered trademark of?

• Monsanto

• Boeing

• DuPont