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A shaft can crack twice before it fails. A Detroit electric plant had this experience with one in a coal pulverizer. Because the first crack rewelded partially (by friction) in service, the pulverizer remained serviceable until the second crack developed.

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Jack J. Bodzin, Gordon W. Houser, 2019. "Analysis of an Unusual Failure of a Steel Shaft in a Coal Pulverizer", ASM Failure Analysis Case Histories: Power Generating Equipment

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