Stress vs Strain Curve and Material Strength

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What is a metal's ability to withstand being pressed or squeezed called?

Shear strength

Compressive strength (correct)

Torsional strength

Bending strength

What is the process called when a metal is softened in order to increase its malleability?

Heat-treating

Annealing (correct)

Work hardening

Heat-treating followed by work hardening

Which property allows a material to be bent, formed, or shaped without cracking or breaking?

Malleability (correct)

Hardness

Brittleness

Ductility

Which type of strength is a metal's ability to resist shear stress?

Torsional strength Signup and view all the answers

What property is generally considered opposite to hardness?

Malleability Signup and view all the answers

What is a metal's ability to resist repeated loading known as?

Fatigue strength Signup and view all the answers

Which property refers to the ability of a metal to be drawn into wire stock, extrusions, or rods?

Ductility Signup and view all the answers

Which property of a metal relates directly to its ability to resist cutting, penetration, or abrasion?

Hardness Signup and view all the answers

What does impact strength (toughness) measure in a metal?

Ability to resist shock Signup and view all the answers

What must be done if hammering and shaping harden a metal to such an extent that it cannot be formed easily?

Anneal it again Signup and view all the answers

What property allows a metal to be hammered, pressed, or rolled into thin sheets without breaking?

Malleability Signup and view all the answers

Which type of loading force is related to a metal's bending strength?

Bending strength Signup and view all the answers

What is the main characteristic that tungsten adds to the steel it is alloyed with?

High melting point Signup and view all the answers

Where are tungsten balance weights typically used?

For control surface balance weights Signup and view all the answers

What is a key advantage of titanium steel alloys?

High corrosion resistance Signup and view all the answers

Why is stainless steel well-suited for high-temperature applications such as firewalls?

Contains large amounts of chromium and nickel Signup and view all the answers

What makes pure iron unsuitable for use as a structural material?

Softness and ductility Signup and view all the answers

What type of elements are alloyed with iron to create steel suitable for varied applications?

A few percent to a few tens of percent of various alloying elements Signup and view all the answers

What is the term used to describe the predictable expansion or contraction of a material at specific temperatures?

Thermal expansion Signup and view all the answers

Which process involves melting two or more compatible pieces of metal into one continuous part?

Fusion joining Signup and view all the answers

What is the most common ferrous metal found in aircraft structures?

Stainless steel Signup and view all the answers

What is the term used to describe the ability of a metal to be joined by heating and melting?

Fusion joining Signup and view all the answers

What is formed when iron combines readily with oxygen?

Rust (iron oxide) Signup and view all the answers

What distinguishes cast iron from other forms of iron?

Higher carbon content Signup and view all the answers

How is the process of normalising different from annealing?

Normalising involves cooling steel in still air, while annealing involves slow cooling in the furnace. Signup and view all the answers

What is the primary factor that determines the maximum hardness carbon steel can attain during hardening?

The carbon content of the steel Signup and view all the answers

Which method is most effective for quickly cooling hardened steel alloy after it has been heated?

Quenching it in oil or brine Signup and view all the answers

What is the purpose of normalising in aircraft work, particularly on welded parts?

To relieve internal stresses and strains set up by forging Signup and view all the answers

Why is it important to cool steel alloy rapidly after hardening?

To achieve the maximum hardness possible Signup and view all the answers

Which method allows for slower heat dissipation when cooling steel?

Packing in hot sand or ash Signup and view all the answers