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[i]One failure mode engineers are studying is the development and spread of microscopic fatigue fractures in the station's metal skeleton. "It's called fracture mechanics, and we actually inspect the structure as it's being built," Shireman said. "The inspection method says I can find a crack down to some minimal length, and if the crack is smaller than this minimum length, then I won't be able to detect it." Station officials can't rely on crew members to inspect for fractures in space.[/i]
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