Exam-style question
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When does plastic deformation typically occur in materials?.
- A.When the material is subjected to low stress.
- B.When the material is heated above its melting point.
- C.When the material exceeds its yield strength.
- D.When the material is cooled rapidly.
Model answer
What a good answer should say
- When the material exceeds its yield strength.
Explanation
Why this works
Plastic deformation occurs when a material is subjected to stress beyond its yield strength, resulting in a permanent change in shape. This is a critical concept in materials science, as it helps predict how materials will behave under different loading conditions.
In contrast, elastic deformation occurs within the limits of proportionality, where the material can return to its original shape.
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