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The following statements are associated with the stress-strain diagram for steel.
  1. For small values of the strain, the relationship is linear (straight line), and the stress is proportional to the strain. This behavior is valid until the stress reaches the proportional limit.
  2. If the stress exceeds the proportional limit, the strain begins to increase more rapidly, and the slope of the curve decreases.
  • a)
    1 and 2 are correct
  • b)
    1 and 2 are wrong
  • c)
    1 correct and 2 wrong
  • d)
    1 wrong and 2 correct
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The following statements are associated with the stress-strain diagram...
The stress-strain diagram for steel is a graphical representation of the relationship between stress and strain during the deformation of steel. The diagram typically shows stress on the y-axis and strain on the x-axis.
Statement 1 is correct because, for small values of strain, the relationship between stress and strain is linear, and stress is proportional to strain. This behavior is known as Hooke’s Law, and it is valid until the stress reaches the proportional limit. The proportional limit is the point beyond which the relationship between stress and strain is no longer linear.
Statement 2 is also correct because, if the stress exceeds the proportional limit, the strain begins to increase more rapidly, and the slope of the curve decreases. This behavior is due to the onset of plastic deformation, which causes the steel to permanently deform even after the stress is removed. The stress at which plastic deformation begins is known as the yield strength, and it is typically higher than the proportional limit.
Therefore, both statements 1 and 2 are correct.
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