Exam-style question
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What does the yield point on a stress-strain graph signify?.
- A.The point at which the material begins to deform plastically.
- B.The maximum stress the material can withstand.
- C.The point of fracture of the material.
- D.The elastic limit of the material.
Model answer
What a good answer should say
- The point at which the material begins to deform plastically.
Explanation
Why this works
The evidence is the yield point on the stress-strain graph, which marks the transition from elastic to plastic deformation. This indicates that beyond this point, the material will not return to its original shape after the stress is removed.
The implication is that understanding the yield point is crucial for material selection in engineering applications. Thus, we conclude that the yield point signifies the onset of plastic deformation.
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