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Stress-Strain Curve and Mechanical Properties of Materials
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Stress-Strain Curve and Mechanical Properties of Materials

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Questions and Answers

What property of metals makes them resistant to failure under shock loads?

  • Brittleness
  • Elasticity
  • Ductility (correct)
  • Malleability
  • Which property makes a material more likely to break or crack when exposed to stress?

  • Malleability
  • Elasticity
  • Ductility
  • Brittleness (correct)
  • What type of metals are examples of brittle ferrous metals?

  • Nickel and brass
  • Titanium and stainless steel
  • Aluminum and copper
  • Cast iron and very hard steel (correct)
  • Which property refers to a metal's tendency to return to its original shape after normal stretching and bending?

    <p>Elasticity</p> Signup and view all the answers

    What is the point beyond which a metal does not return to its original shape after a deforming force is removed?

    <p>Elastic limit</p> Signup and view all the answers

    Which type of metals have very low elastic limits according to the text?

    <p>Non-ferrous metals</p> Signup and view all the answers

    What characteristic does tungsten add to steel when it is alloyed with it?

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

    Where are tungsten steels typically used due to their high density and retained hardness at elevated temperatures?

    <p>Control surface balance weights and breaker contacts in magnetos</p> Signup and view all the answers

    What is a key advantage of titanium steel alloys?

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

    Which type of steel is well suited for high-temperature applications like firewalls and exhaust system components?

    <p>Stainless steel</p> Signup and view all the answers

    Why is pure iron not suitable for use as a structural material?

    <p>It is unresponsive to heat treatment</p> Signup and view all the answers

    What element is typically alloyed with iron to create steel?

    <p>Carbon</p> Signup and view all the answers

    What is the main effect of sulphur in steel?

    <p>Increases brittleness</p> Signup and view all the answers

    How is the negative impact of sulphur in steel countered?

    <p>By adding manganese</p> Signup and view all the answers

    What role does manganese play in the presence of sulphur in steel?

    <p>Combines with sulphur to form a harmless compound</p> Signup and view all the answers

    Which element raises the yield strength of steel and improves its resistance to atmospheric corrosion?

    <p>Phosphorous</p> Signup and view all the answers

    What effect does nickel have on the hardening process of steel when heat-treated?

    <p>Slows down the rate of hardening</p> Signup and view all the answers

    How does manganese improve a metal's forging characteristics?

    <p>By making it less brittle at rolling and forging temperatures</p> Signup and view all the answers

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

    <p>Compressive strength</p> Signup and view all the answers

    Which type of strength relates to a metal's ability to withstand shear stress?

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

    What is a metal's ability to resist cutting, penetration, or abrasion known as?

    <p>Hardness</p> Signup and view all the answers

    Which metallic strength refers to the metal's ability to resist repeated loading?

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

    What property of steel directly relates to its tensile strength?

    <p>Hardness</p> Signup and view all the answers

    Which type of strength is related to a metal's ability to resist shock?

    <p>Impact strength</p> Signup and view all the answers

    What property refers to a metal's tendency to return to its original shape after stretching and bending?

    <p>Elasticity</p> Signup and view all the answers

    Which property describes a material's ability to resist tearing or breaking when bent or stretched?

    <p>Toughness</p> Signup and view all the answers

    What does conductivity refer to in metals?

    <p>Ability to carry heat or electricity</p> Signup and view all the answers

    Which property describes a metal's ability to expand when heated and shrink when cooled?

    <p>Thermal Expansion</p> Signup and view all the answers

    What characteristic makes a metal a good electrical conductor?

    <p>Ability to carry electrons</p> Signup and view all the answers

    Which example reflects an application where toughness and hardness are both necessary in metals?

    <p>Hammer faces and wrenches</p> Signup and view all the answers

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