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ASM Failure Analysis Case Histories

Handbook of Case Histories in Failure Analysis

Edited by
Khlefa A. Esaklul
Khlefa A. Esaklul
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ASM International
Volume
1
ISBN electronic:
978-1-62708-214-3
Publication date:
1992
Book Chapter

Flow-Induced Vibration Fatigue of Stainless Steel Impeller Blades in a Circulating Water Pump

By
Samuel J. Brown
Samuel J. Brown
Quest Engineering Development Corporation/ISI
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;
Edward V. Bravenec
Edward V. Bravenec
Anderson & Associates/ISI
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Published:
1992
Page range:
251 - 260

Abstract

Several large-diameter type 304L stainless steel impeller/propeller blades in a circulating water pump failed after approximately 8 months of operation. The impeller was a single casting that had been modified with a fillet weld buildup at the blade root. Visual examination indicated that the fracture originated near the blade-to-hub attachment in the area of the weld buildup. Specimens from four failed castings and from an impeller that had developed cracks prior to design modification were subjected to a complete analysis. A number of finite-element-method computer models were also constructed. It was determined that the blades failed by fatigue that had been accelerated by stress-corrosion cracking. The mechanism of failure was flow-induced vibration, in which the vortex-shedding frequencies of the blades were attuned to the natural frequency of the blade/hub configuration. A number of solutions involving material selection and impeller redesign were recommended.

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Samuel J. Brown, Edward V. Bravenec, 1992. "Flow-Induced Vibration Fatigue of Stainless Steel Impeller Blades in a Circulating Water Pump", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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