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← TechnologyWhich outcome occurs when residual stresses exceed fracture toughness in cast components?
A)Brittle fracture or cracking occurs✓
B)Increased fatigue life achieved
C)Enhanced corrosion resistance appears
D)Improved surface finish generated
💡 Explanation
Brittle fracture occurs due to exceeding the material's inherent resistance. This results from tensile stresses that initiate cracks which propagate rapidly via stress intensification at the crack tip (stress concentration), because the energy release due to crack extension exceeds the energy required, therefore leading to failure rather than plastic deformation or improved properties.
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