Which consequence resulted from imperfections during the casting of Song Dynasty cannons?

💡 Explanation

Accelerated barrel cracking happens because of stress concentrating around voids formed by imperfect mold filling; the mechanism is stress concentration. With these casting defects, thermal stress is increased because of uneven heating, rather than reduced penetration or changed powder burn.

• During ancient smelting which outcome results because iron blooms are repeatedly hammered?
• Which optical outcome occurred in Alhazen's pinhole experiments used to investigate image formation?
• Which outcome would over-irrigation along the Euphrates Valley during Mesopotamian civilization cause?
• Which mechanism allowed pre-industrial water wheels to efficiently grind grain using a limited water supply?
• Which problem did interlocking timber scantlings address in 18th-century ship construction?
• Which navigational outcome resulted from Islamic scholars enhancing the mechanical accuracy of astrolabes?