Stress vs Strain Curve and Material Strength
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Questions and Answers

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?

<p>Torsional strength (A)</p> Signup and view all the answers

What property is generally considered opposite to hardness?

<p>Malleability (A)</p> Signup and view all the answers

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

<p>Fatigue strength (B)</p> Signup and view all the answers

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

<p>Ductility (D)</p> Signup and view all the answers

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

<p>Hardness (A)</p> Signup and view all the answers

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

<p>Ability to resist shock (C)</p> 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?

<p>Anneal it again (D)</p> Signup and view all the answers

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

<p>Malleability (D)</p> Signup and view all the answers

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

<p>Bending strength (A)</p> Signup and view all the answers

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

<p>High melting point (A)</p> Signup and view all the answers

Where are tungsten balance weights typically used?

<p>For control surface balance weights (D)</p> Signup and view all the answers

What is a key advantage of titanium steel alloys?

<p>High corrosion resistance (C)</p> Signup and view all the answers

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

<p>Contains large amounts of chromium and nickel (D)</p> Signup and view all the answers

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

<p>Softness and ductility (B)</p> Signup and view all the answers

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

<p>A few percent to a few tens of percent of various alloying elements (B)</p> Signup and view all the answers

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

<p>Thermal expansion (A)</p> Signup and view all the answers

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

<p>Fusion joining (B)</p> Signup and view all the answers

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

<p>Stainless steel (B)</p> 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?

<p>Fusion joining (C)</p> Signup and view all the answers

What is formed when iron combines readily with oxygen?

<p>Rust (iron oxide) (B)</p> Signup and view all the answers

What distinguishes cast iron from other forms of iron?

<p>Higher carbon content (D)</p> Signup and view all the answers

How is the process of normalising different from annealing?

<p>Normalising involves cooling steel in still air, while annealing involves slow cooling in the furnace. (A)</p> Signup and view all the answers

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

<p>The carbon content of the steel (C)</p> Signup and view all the answers

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

<p>Quenching it in oil or brine (C)</p> Signup and view all the answers

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

<p>To relieve internal stresses and strains set up by forging (D)</p> Signup and view all the answers

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

<p>To achieve the maximum hardness possible (B)</p> Signup and view all the answers

Which method allows for slower heat dissipation when cooling steel?

<p>Packing in hot sand or ash (B)</p> Signup and view all the answers

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