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← HistoryWhich risk sharply increases for late 15th century cast iron cannons during extended bombardments?
A)Bore diameter decreases marginally
B)Propellant burn rate decelerates sharply
C)Crystalline dendritic fracture propagates rapidly✓
D)Trunnion mountings experience plastic yielding
💡 Explanation
Rapid dendritic fracture occurs, because thermal cycling induces rapid crack growth within the cast iron's crystalline structure. Therefore material catastrophic failure occurs, rather than the slower more predictable trunnion yielding.
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