Engineering Board Exam Reviewer · Strength of Materials · medium
The yield point of a ductile material marks the stress at which the material:
- Begins to deform plastically with little or no increase in stress
- Fractures completely
- Reaches its ultimate tensile strength
- Returns to its original length when unloaded
Answer
A. Begins to deform plastically with little or no increase in stress
Solution
At the yield point a ductile material starts to undergo permanent (plastic) deformation, after which strain increases significantly with little change in stress.
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