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Another failure in a turbogenerator, similar to the accidents in Toronto described in Metal Progress in July 1956, was due to the presence of fatigue cracks at ventilating holes. These acted as stress-raisers during temporary and minor overspeeding, inducing an almost instantaneous brittle failure which wrecked the machine, fortunately without human casualty.

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R. James Landrum, 2019. "Another Turbogenerator Failure", ASM Failure Analysis Case Histories: Power Generating Equipment

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