The most serious manufacturing defect from fracture toughness point of view is____________________?
Correct answer: D. Crack
- A. Surface roughness
- B. Pores
- C. Spherical inclusion
- D. Crack
Explanation
A crack is the most dangerous manufacturing defect because its sharp tip produces a strong stress concentration and can initiate rapid fracture. Rounded pores and spherical inclusions generally cause less severe concentration of stress.
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