Construction Materials/Metal Working Flashcards
What are the 6 types of stresses on aircraft?
Tension, Shear, Compression, Torsion, Bending, and Bearing
Give a brief explanation of each type of stress: Tension, Shear, Compression, Torsion, Bending, and Bearing.
Tension- pulls apart, Compression-squeezes, Shear- one layer slides over another, Bearing- force a rivet or bolt places on its hole, Torsion- twisting, Bending- combo of compression and tension.
What are the three basic methods of metal working?
Hot-Working, Cold-Working, and Extruding
What is Hot-Working?
Hot-working involves heating metal above the critical range and either Hot-rolling it or forging it.
What is cold-working?
Mechanical working of metal at temperatures below the critical range and results in strain hardening of the metal. Cold-Rolling or Cold-Drawing.
What is extruding?
Forcing metal through an opening in a die, most common with aluminum.
What are the most common metals used in aircraft construction?
M.A.S.T. Magnesium, aluminum, steel, and titanium.
What is an alloy?
Materials that are composed of two or more metals. (The metal with the largest amount present is the base alloy.)
What is the most common alloy used in modern aircraft, and what characteristics does it provide?
Aluminum- High strength-to-weight ratio, ease of fabrication, nonmagnetic, and excellent conductor.
What is cladding or alcladding?
Laminating a thin layer of pure aluminum to both sides of a sheet of metal to improve corrosion resistance.
Titanium is commonly used for engine components, firewalls, ducting, etc. Why?
Moderate strength up to 600F
Magnesium is the lightest of structural metals, at 2/3rd the weight of aluminum, however it has to be alloyed with ___, ____, or ___ to produce the highest strenght-to-weight ratio.
Zinc, aluminum, and manganese
Magnesium is not used extensively due to its low resistance to corrosion. What is it used for?
Wheels, Accessory housings, gear box housings, sumps, etc
For substituting metals, the structural repair manual must be consulted. What are the four requirements to make a substitution?
Must maintain original: Strength, Weight, Contour, and corrosion resistance.
List some of the most common composites/nonmetallics likely to be seen in CG aviation.
Aramid Fibers(Kevlar-49,) Carbon-graphite, fiberglass, plasitcs, and synthetic rubber.
