amt hardware 1

Difference between thermoplastic and thermosetting polymers

Thermoplastics can be reheated and reshaped, whereas thermosetting polymers cannot be reshaped after curing.

Two main components of a composite material

Reinforcement and resin.

Component that provides most of a composite's strength

Reinforcement/fibers.

Main advantage of composite materials

High strength-to-weight ratio.

Main inspection difficulty associated with composite materials

Delamination is hard to detect.

Structural composition of a composite sandwich panel

Face sheet + core + face sheet.

Common core material structure used in aerospace sandwich panels

Honeycomb.

Key fluid resistance property of Buna-N rubber

Oil and gasoline resistance.

Key environmental resistance property of silicone rubber

Wide temperature resistance.

Three main functional classes of seals

Packings, gaskets, and wipers.

Primary application of seal packings

Sealing between moving parts.

Primary application of gaskets

Sealing between stationary surfaces.

Primary function of wiper seals

Keeping dirt out and protecting piston shafts.

Directional sealing capacity of O-rings

Seals in both directions.

Minimum pressure threshold requiring the use of backup rings

$$1,500\,\text{psi}$$

Orientation direction of V-rings and U-rings relative to pressure

Facing toward the pressure.

Characteristic of a one-part sealant

Ready to use directly without mixing.

Components of a two-part sealant system

Base + accelerator.