Identify And Select Aircraft Materials Flashcards
What is the basic wood used for aircraft wing spars?
Sitka spruce.
What type of fabric is most widely used for covering aircraft structures?
Heat-shrinkable polyester fabric.
What is the alloy number of the most commonly used aluminum alloy for aircraft structure use?
2024-T.
What is the alloy number of a high strength aluminum alloy that has zinc as an alloying component?
7075
Why is it very important that the surface of a piece of clad aluminum alloy not be scratched?
The pure aluminum used for cladding in noncorrosive, but the aluminum alloy below the cladding is susceptible to corrosion. If the cladding is scratched through, corrosion could form.
Why is it important that a piece of aluminum alloy be quenched immediately after it is removed from the heat treating oven?
Any delay in quenching aluminum alloy after it is removed from the oven will allow the grain structure to grow enough that intergranular corrosion is likely to form in the metal.
Explain the way a piece of aluminum alloy is solution heat-treated.
The aluminum is heated in an oven to the proper temperature for a specified time; then it is removed and quenched in water.
What is meant by precipitation heat treatment of a piece of aluminum alloy?
After a piece of aluminum has been solution heat-treated, it is held at a specified elevated temperature for a period of time. Precipitation heat treating is also called artificial aging.
What type of composite material is used when stiffness is the prime requirement?
Graphite (carbon)
What type of composite material is used when toughness is the prime requirement?
Kevlar
How does filiform corrosion usually appear on an aircraft structure?
As thread-type lines of puffiness under a film of polyurethane or other dense finish system topcoats.
