Exam-style question
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Which statement is true regarding elastic and plastic deformation?.
- A.Both types of deformation are reversible.
- B.Elastic deformation occurs before plastic deformation.
- C.Plastic deformation can occur without any applied stress.
- D.Elastic deformation is always permanent.
Model answer
What a good answer should say
- Elastic deformation occurs before plastic deformation.
Explanation
Why this works
In the deformation process, materials first exhibit elastic behavior, where they can return to their original shape upon removal of stress. If the stress continues to increase and exceeds the yield point, the material will undergo plastic deformation, resulting in permanent changes.
This understanding is fundamental in engineering and material selection.
Common mistake
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