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A blade from the engine cooling fan of a pickup truck fractured unexpectedly. The blade was made from type 301 stainless steel in the extra full hard tempered condition with a hardness of 47 HRC. Failure analysis indicated that the blade fractured in three modes: crack initiation, fatigue crack propagation, and final rapid fracture in a ductile manner The fatigue crack originated near a rivet hole.

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Robert A. McCoy, 1993. "Fatigue Fracture of a Fan Blade", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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