Isothermal Forming Operations: Strain Rate Sensitivity
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Questions and Answers

What is the main purpose of metal forming processes?

  • To increase the weight of metal workpieces
  • To change the color of metal workpieces
  • To reduce the melting point of metal workpieces
  • To change the shape of metal workpieces through plastic deformation (correct)

Which of the following is not a bulk deformation process in metal forming?

  • Extrusion
  • Rolling
  • Forging
  • Deep drawing (correct)

In metal forming, what does the strain-hardening exponent 'n' represent?

  • Temperature sensitivity
  • Strength coefficient
  • Strain-hardening behavior (correct)
  • Strain rate sensitivity

From the given text, which book is not referenced for the study of metal forming?

<p>Engineering Mechanics by Andrew Pytel and Jaan Kiusalaas (C)</p> Signup and view all the answers

What is the major advantage of warm working over cold working?

<p>Need for annealing may be reduced or eliminated (A)</p> Signup and view all the answers

At what temperature range does hot working typically occur?

<p>0.5 Tm ~ 0.75 Tm (A)</p> Signup and view all the answers

What is a disadvantage of hot working compared to cold working?

<p>Poorer surface finish (A)</p> Signup and view all the answers

Why is hot forming preferred for metals that fracture in cold working?

<p>Metals soften at higher temperatures in hot forming (C)</p> Signup and view all the answers

What are the undesirable effects of friction in metal forming processes?

<p>Retarded metal flow, residual stresses, defects, increased forces, and power requirements (C)</p> Signup and view all the answers

Why is tool wear a major concern in metal forming processes?

<p>It can lead to loss of dimensional accuracy, resulting in defective parts and requiring replacement of the tooling (A)</p> Signup and view all the answers

What role do metalworking lubricants play in metal forming processes?

<p>Reduce harmful effects of friction, forces, power, and tool wear (C)</p> Signup and view all the answers

What considerations are important when choosing a metalworking lubricant?

<p>Chemical reactivity with the work material and work metals (C)</p> Signup and view all the answers

What is the purpose of isothermal forming?

<p>To minimize heat loss during forming operations (D)</p> Signup and view all the answers

How does strain rate change in isothermal forming when deformation speed is constant?

<p>It increases as the height of the workpiece decreases (C)</p> Signup and view all the answers

What does strain rate sensitivity measure in metal forming processes?

<p>The impact of strain rate on flow stress (A)</p> Signup and view all the answers

Why does friction arise in metal forming processes?

<p>From the high pressures driving surfaces together during operations (C)</p> Signup and view all the answers

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