the Aviation Dictionary

strength - The ability of a material to withstand forces
that attempt to deform it. The ability of a material to
resist stress without breaking.
strength-to-weight ratio - The ratio of a material's
strength to its weight.
stress - The internal resistance or change in shape or
size expressed in force per unit area. A stress
concentration is an area where the level of an applied
stress causes a notch, void, hole, or inclusion.
stress analysis - A mathematical determination of the
loads experienced by a structure under specific
circumstances.
stress corrosion - Intergranular corrosion that forms
within metals subject to tensile stresses and in a
corrosive environment. Exposure to such an
environment alone would not have caused corrosion.
Tends to separate the grain boundaries.
stress crack-Tn composites, external or internal cracks in
a plastic caused by tensile stresses less than that of its
short-time mechanical strength. The stresses that cause
cracking can be present internally or externally or can
be combinations bf these stresses:
stress management - Personal analysis of stress being
experienced and the application of appropriate coping
mechanisms.
strength - subassembly
sequenced flashing rate of the scope is then read to
determine the RPM of the unit being observed.
stroke - In a reciprocating engine, the distance a piston
travels from bottom dead center (BDC) to top dead
center (TDC). Stroke is two times the crankshaft throw.
structural adhesive - In composites, adhesive used for
transferring required loads between two cured parts.
An adhesive can also be used to bond metal to a
composite structure.
structural bond - A bond that joins basic load-bearing
parts of an assembly. The load can be either static or
dynamic.
structural failure - When a structure fails to withstand
the stresses imposed upon it.
structural icing - The formation of ice on the exterior
or structure of an aircraft.
structural machine screws - Machine screws having an
unthreaded portion of the shank and made of
high-strength alloy steel. Used in place of an aircraft
bolt to carry shear loads and some tensile loads.
structural member - Any part of an aircraft structure
designed to carry loads or stress.
structural steel - An alloy steel used for parts of an
aircraft subjected to high structural loads.
stress relieve -A general term describing the process of strut - 1. A compression member in a truss. 2. The
relieving internal stresses within metals by controlled external bracing on a non-cantilever airplane. 3. The
heating and cooling. Annealing and normalizing are stub wing assembly through which thrust loads are
more specific terms for this process.
transmitted from a pod-mounted turbine engine into the
stress riser - A location on a part that due to shape, or
fiselage.
due to a defect, is more prone to failure as the result of strux - In composites, a foam like material used to form
stress than the rest of the part. This could be due to a structural sections for stiffening.
drastic change in cross-section or where the part has
been gouged or scratched. Stresses become
stub antenna - A short, UHF, quarter-wavelength
concentrated at such locations.
antenna normally used for radar beacon transponders or
distance measuring equipment.
stressed-skin structure - Aircraft skin designed to
carry the tension and compression stresses of structural
stud - A headless
loads. Stressed-skin structured aircraft have few
bolt that has threads
internal structural members.
on each end. One
end often has coarse
stretching - A sheet metal forming operation in which threads for screwing into a casting, while the other end
the material is mechanically stretched over dies to form has fine threads to accept a nut.
compound curves.
stuffing box - A box through which a rotating shaft
stringer - A thin metal or wood strip running the length passes. It is packed with a material that inhibits leakage -
ofthe hselage to fill in the shape of the formers.
ground the shaft.
stroboscope - A device that can be adjusted to flash at styrene - A liquid hydrocarbon used in the manufacture
specific rates. It can be used to "freeze" the apparent of certain synthetic resins to improve their workability.
motion of propellers, pulleys, belts, rotors, etc., in Also, any of various synthetic plastics made from
order to inspect the action as if it is stopped.
styrene by polymerization or copolymerization.
stroboscope tachometer - A variation of a stroboscope. Styrofoam - A rigid polymer of styrene plastic material.
The stroboscope tachometer is shown on a rotating unit
and adjusted until apparent rotation is stopped. The
subassembly - An assembly that is a component of a
larger assembly.
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