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ASTM Selected Technical Papers
Case Histories Involving Fatigue and Fracture Mechanics
By
CM Hudson
CM Hudson
1
NASA-Langley Research Center
,
Hampton, VA
;
cochairman and coeditor
.
Search for other works by this author on:
TP Rich
TP Rich
2
Bucknell University
,
Lewisburg, PA 17837
;
cochairman and coeditors
Search for other works by this author on:
ISBN-10:
0-8031-0485-5
ISBN:
978-0-8031-0485-3
No. of Pages:
435
Publisher:
ASTM International
Publication date:
1986

Stress analyses incorporating stress concentration, fatigue, and fracture calculations should be an important aspect of failure analyses. The following description of a saw arbor failure provides a simple example of this necessity. The failure was a classical stepped shaft in bending fatigue failure. Stress concentration at the change in diameters was calculated to be a factor of five. However, stress calculations revealed normally expected stresses to be well below the endurance limit even with the stress concentration effects. Additional investigation revealed evidence for severe imbalance loads from one saw blade. It was hypothesized that some of the teeth from the carbide tipped saw had been knocked off, and the resulting imbalance loads were more than sufficient to initiate fatigue cracking.

1.
Peterson
,
R. E.
,
Stress Concentration Factors
,
Wiley
,
New York
,
1974
, Figs. 78, 78a, 79 and 79a.
2.
Atkins
,
A. G.
and
Felbeck
,
D. K.
,
Metals Engineering Quarterly
, Vol.
14
, No.
2
,
05
1974
, pp. 55-61.
3.
Fuchs
,
H. O.
, and
Stephens
,
R. I.
,
Metal Fatigue in Engineering
,
Wiley
,
New York
,
1980
, p. 155.
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