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Fatigue Fracture of a Fan Blade

Robert A. McCoy

Abstract

Abstract 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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Available abstract

Key concepts: Blade (archaeology), Materials science, Fatigue testing, Structural engineering, Fracture (geology), Rivet, Crack closure, Fracture mechanics