Machine Design quizzes
How loads, fatigue, and stress concentrations affect machine parts, and why they can fail below their expected strength.
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From Machine Design: Why Parts Break Below Their Strength
A ductile metal block is squeezed by enormous pressure equally from all sides. What happens?
- It does not yield at all
- It yields at its usual tensile strength
- It shatters like glass
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Answer: It does not yield at all
Equal pressure from all sides produces no shear, so dislocations aren't driven to move; von Mises predicts no yielding.
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