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← HistoryWhich destructive outcome accelerates when Ming Dynasty cast iron cannons exceeded thermal limitations?
A)Faster propellant deflagration leads to explosions
B)Smelting inefficiency resulted in weakened structures
C)Internal bore bulging increases projectile friction✓
D)Delayed charge ignition affects shot trajectory
💡 Explanation
Bore bulging induces progressive failure because gas pressure overcomes the hoop strength, thus causing deformation via creep. This outcome occurs rather than direct explosion in correctly manufactured cannons containing acceptable alloy compositions at normal operational temperatures, therefore bulging dominates.
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