Which mechanism caused repeated failures in early iron suspension bridges during the 19th century?

💡 Explanation

When early iron suspension bridges experienced cyclic loading, fatigue crack growth occurred because repeated stress weakened the iron's microscopic structure, leading to eventual fracture. Therefore fatigue crack growth results, rather than corrosion or erosion, which require electrochemical or chemical breakdown.

• Which effect resulted from Aztec farmers intercropping maize with beans and squash in chinampa systems?
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• Which risk increases when a wooden sailing ship experiences prolonged exposure to marine borers in warm waters?
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