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Doctors Medicines MCQs Q&A

  1. Fatigue
  2. Brittleness
  3. Elasticity
  4. Fatigue strength
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1 Answers

Option 4 : Fatigue strength

CONCEPT:

  • Fatigue: Materials subjected to repetitive or fluctuating stress will fail at a stress much lower than that required to cause failure under steady loads. This behavior is called fatigue.
  • The endurance limit (or fatigue limit or fatigue strength) represents the largest value of the fluctuating stress which will not cause failure for an essentially infinite number of cycles. In most cases, this value is approximately 40-50% of the tensile strength. 
  • Brittleness: The property of a material that fractures when subjected to stress but has a little tendency to deform before rupture is called brittleness.
  • Elasticity: The ability of an object or material to regain its normal shape after being stretched or compressed is called elasticity.

EXPLANATION:

  • The stress at which a material fails by fatigue is known as fatigue strength. So option 4 is correct.
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