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← HistoryWhich threat increased in medieval rope bridges due to diurnal cycles?
A)Material strength becomes directional
B)Tension induces rope degradation✓
C)Supports initiate resonant oscillations
D)Torsion amplifies material weaknesses
💡 Explanation
Repeated daily cycles of moisture and drying caused ropes to repeatedly expand then contract, triggering cyclic loading. This fatigue cracking occurred mainly through tension inducing rope degradation, because it repeatedly strained the hemp or other fibers, therefore wearing them down, rather than causing purely structural modes such as oscillations.
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