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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

Fatigue Failure of a Steering Spindle on a Tricycle Agricultural Field Chemical Applicator

By
Dean E. Orr
Dean E. Orr
Orr Metallurgical Consulting Service, Inc.
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Published:
1992
Page range:
88 - 91

Abstract

The 4140 steel steering spindle on a tricycle agricultural field chemical applicator failed, causing the loss of the front wheel and overturn of the vehicle. The spindle was a solid 120 mm (4.75 in.) diam forging. It had been machined to 115 mm (4.5 in.) in diameter to fit tightly inside a collar at one point and to 90 mm (3.5 in.) for attachment to the steering mechanism at another. Visual examination showed that the spindle fractured at the fillet welds that attached it to the collar. Macrofractography and metallography revealed that the failure initiated at the root of a weld that bridged a wide gap. The most probable cause of failure was improper preheat during welding.

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Dean E. Orr, 1992. "Fatigue Failure of a Steering Spindle on a Tricycle Agricultural Field Chemical Applicator", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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