Which risk escalates with continued swinging motion in historical rope bridges?

💡 Explanation

Strand fretting fatigue increases because cyclic localized stress leads to micro-cracks weakening the cable material. Therefore, cable failure becomes more probable rather than simple tensile overload or global bending, which are less sensitive to dynamic motion when loads increase over time.

• Which outcome followed the Song Dynasty's discovery of coke fueled iron smelting?
• Which navigational error increases when a 18th-century sextant’s horizon mirror is misaligned relative to main frame perpendicularity?
• Which risk increased during medieval siege when temporary wooden bridges (siege bridges) exceeded safe length?
• Which outcome occurred when the Sumerians over-exploited Tigris-Euphrates irrigation channels?
• Which agricultural outcome occurred earliest due to terrace construction?
• Which outcome would occur if Medieval Islamic astrolabes experienced significant thermal fluctuations?