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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

Mode III Fatigue Crack Growth Following the Curvature of the Heat-Affected Zone of a Type 321 Stainless Steel Spot Weld

By
Michael Neff
Michael Neff
SEAL Laboratories
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Published:
1992
Page range:
39 - 46

Abstract

Several AISI type 321 stainless steel welded oil tank assemblies used on helicopter engine systems began to leak in service. One failure, a fracture on the aft side of a spot weld, was submitted for analysis. SEM fractography examination revealed fatigue failure. The failure initiated at an overload fracture near the root of the weld and was followed by mode III fatigue crack propagation (tearing) around the periphery of the weld. The initial overload fracture was caused by a high external load, which produced a concentrated stress and fracture at the weld root. The subsequent fatigue fracture was caused by engine vibrations during operation of the aircraft. Fracture characteristics indicated that the fatigue would not have occurred if the initial damage had not taken place.

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Michael Neff, 1992. "Mode III Fatigue Crack Growth Following the Curvature of the Heat-Affected Zone of a Type 321 Stainless Steel Spot Weld", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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