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Q: The point at which the stress-strain curve of a material ceases to be a straight line is called
  • A. Elastic limit
  • B. limit of proportionality
  • C. yield point
  • D. Ultimate stress
Correct Answer: Option B - Limit of proportionality– It is the stress at which the stress-strain curve ceases to be a straight line. Plastic limit– It is the point on the stress strain curve upto which the materials remains elastic upto this point there is no permanent deformation after removal of load.
B. Limit of proportionality– It is the stress at which the stress-strain curve ceases to be a straight line. Plastic limit– It is the point on the stress strain curve upto which the materials remains elastic upto this point there is no permanent deformation after removal of load.

Explanations:

Limit of proportionality– It is the stress at which the stress-strain curve ceases to be a straight line. Plastic limit– It is the point on the stress strain curve upto which the materials remains elastic upto this point there is no permanent deformation after removal of load.