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Shaft Failure

Metallurgical failure analysis was requested after a company experienced several identical shaft failures. Macro and microscopic examination revealed that these shaft failures were the result of bending fatigue. The metal fatigue, which was observed on the shaft fracture surface, was due to an inadequate filet radius at a diameter change in the subject shaft. The inadequate radius was due to a machining error and was a manufacturing defect.

Overall view of failed shaft
Photograph A.  Failed shaft, which separated at a diameter transition.
Close-up view of failed shaft halves
Photograph B.  Two halves of the failed shaft showing two-way bending fatigue failure of shaft.

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J.E.I. Metallurgical, Inc.

5514 Harbor Town
Dallas, Texas 75287

Phone: (972) 934-0493
Fax: (469) 737-3938

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