Material Properties Stress and Strain Quiz
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Questions and Answers

Which property describes the relationship between stress and strain for biological tissues when the stretch is relatively small?

  • Elastic region
  • Hooke's law (correct)
  • Plastic region
  • Yield Point

In bending of an object, which side becomes convex?

  • The unstressed 'neutral axis'
  • The whole bent area
  • The side in compression
  • The side in tension (correct)

Which type of bending occurs when a compressive force acts off-center from the long axis of an object?

  • Long bone bending
  • Four point bending
  • Cantilever bending (correct)
  • Three point bending

Where are the highest tensile and compressive stresses located in a bent object?

<p>On the outer surfaces (A)</p> Signup and view all the answers

What type of forces produce bending in an object?

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

In four point bending, where does failure typically occur?

<p>At the weakest point between two inside forces (D)</p> Signup and view all the answers

What is the relationship between the radius of a shaft and its resistance to torsion?

<p>Larger radius, greater resistance to torsion (A)</p> Signup and view all the answers

Which of the following is NOT a characteristic of biological materials?

<p>Time-independent behavior (B)</p> Signup and view all the answers

How does the fluid component in biological tissue affect the material's stress-strain behavior?

<p>It affects the material's resistance to flow (A)</p> Signup and view all the answers

What is the relationship between an increase in strain rate and the stiffness of a viscoelastic material?

<p>Increase in strain rate produces an increase in stiffness (A)</p> Signup and view all the answers

What is the term used to describe the energy lost in a viscoelastic material due to internal friction?

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

Which of the following properties is a measure of the capacity of a material to sustain permanent deformation?

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

Which of the following best describes the initial cycles effect of material fatigue?

<p>Shift in the mechanical response of the material (C)</p> Signup and view all the answers

What is the key difference between elastic and plastic deformation of a material?

<p>All of the above (D)</p> Signup and view all the answers

What is the term used to describe the stress at which a material's deformation changes from elastic to plastic?

<p>Both a and b (C)</p> Signup and view all the answers

Which of the following best describes the cumulative effect of material fatigue?

<p>Continued loading leads to material failure (B)</p> Signup and view all the answers

Which type of material will continue to deform elastically until it breaks?

<p>Brittle material (B)</p> Signup and view all the answers

What is the definition of a material's 'toughness'?

<p>The amount of energy a material can absorb before it breaks (D)</p> Signup and view all the answers

Which of the following best describes the behavior of a viscoelastic material?

<p>It exhibits both elastic and viscous properties, with slow recovery and less energy return. (A)</p> Signup and view all the answers

How does the stress-strain curve of a viscoelastic material differ from that of an elastic material?

<p>The stress-strain curve of a viscoelastic material shows hysteresis, with the loading and unloading paths being different. (D)</p> Signup and view all the answers

How does the stiffness of a viscoelastic material change with the rate of loading?

<p>The stiffness of a viscoelastic material increases as the rate of loading increases. (B)</p> Signup and view all the answers

Which of the following materials is an example of a viscoelastic material?

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

How does the deformation of a viscoelastic material change over time under a constant load?

<p>The deformation increases over time, a phenomenon known as creep. (C)</p> Signup and view all the answers

Which of the following best describes the relationship between the rate of loading and the stress and strain in a viscoelastic material?

<p>The slower the rate of loading, the lower the stress and strain. (B)</p> Signup and view all the answers

Which of the following statements about stress is correct?

<p>Stress is the internal resistance to an external load, measured in Pascals (Pa). (C)</p> Signup and view all the answers

What is the relationship between stress and strain in a linear material?

<p>Stress and strain are related by Hooke's law, where stress is proportional to strain. (D)</p> Signup and view all the answers

Which of the following statements about strain is correct?

<p>Strain is the proportional change in dimension of an object due to an external force. (C)</p> Signup and view all the answers

Which of the following statements about biological materials is correct?

<p>Biological materials exhibit non-linear stress-strain behavior due to their tissue fluid component (viscoelastic properties). (D)</p> Signup and view all the answers

What is the unit of Young's Modulus, which represents the stiffness or compliance of a material?

<p>Young's Modulus is measured in Pascals per unit strain (Pa/strain). (A)</p> Signup and view all the answers

Which of the following types of stress is associated with sliding one layer of molecules across another?

<p>Shear stress (C)</p> Signup and view all the answers

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