Which structural vulnerability arises from the Roman onager siege engine design when repeatedly targeting a fortified wall?

💡 Explanation

When the onager repeatedly launches projectiles, tensile stress concentrates at the timber frame joints because the sudden release of energy causes significant strain. Therefore timber frame splitting results, rather than rope fraying which is slower, counterweight shifting which is adjusted, or base sinking which depends on the ground.

• Which microstructural change occurs in early bronze tools when repeatedly cold worked, such as hammering?
• Which angular measurement error would result if al-Biruni's astronomers incorrectly leveled an astrolabe during solar altitude observations?
• Which inaccuracy plagued early 18th-century sextant measurements aboard wooden ships during ocean voyages?
• Which error corrupted celestial altitude measurements when using a medieval astrolabe during maritime navigation?
• Which structural consequence frequently occurred as medieval stone fortifications aged and mortar weathered?
• Which distortion increases when sextant mirrors become misaligned due to thermal stress across their mounting points?