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ASTM Selected Technical Papers
Multiaxial Fatigue
By
KJ Miller
KJ Miller
1Department of Mechanical Engineering,
University of Sheffield
,
Sheffield,
U.K.
symposium chairmen and editors
.
Search for other works by this author on:
MW Brown
MW Brown
2Department of Mechanical Engineering,
University of Sheffield
,
Sheffield,
U.K.
symposium chairmen and editors
.
Search for other works by this author on:
ISBN-10:
0-8031-0444-8
ISBN:
978-0-8031-0444-0
No. of Pages:
751
Publisher:
ASTM International
Publication date:
1985

Biaxial fatigue tests were conducted on Inconel 718 specimens at room temperature. Thin-walled tubular specimens were subjected to tension, torsion, and combined tension and torsion loading in strain control. Two strain ratio's Rε = 0 and Rε = −1.0, were investigated. Effective strain amplitudes of 1.0 and 0.5% were employed and resulted in fatigue lives ranging from 103 to 104 cycles. Fatigue lives were determined in terms of life to 0.1 and 1.0-mm cracks as well as specimen failure. Fatigue lives were correlated in terms of the Lohr and Ellison parameter for plastic strain which is based on the plane of maximum shear strain that causes the crack to grow into the thickness of the specimen and the normal strain to that plane. Good correlation was also obtained for the Kandel, Brown, and Miller parameter which is based on maximum shear strain and the normal strain to the maximum shear plane. Mean stress effects for the Rε = 0 tests were observed. These data could be correlated with the Rε = −1 data by introducing a mean stress term in the parameters which were then combined with the Coffin-Manson equation for estimating fatigue lives. Data on 24 tests correlated within a factor of 1.5 on life when fatigue lives were determined on the basis of 1-mm cracks.

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,
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, ASTM 549,
American Society for Testing and Materials
,
Philadelphia
,
1974
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2.
Brown
,
M. W.
and
Miller
,
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,
Proceedings
,
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, Vol.
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,
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,
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,
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, No.
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,
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4.
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,
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and
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,
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,
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, Vol.
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,
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,
F. A.
,
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,
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, and
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,
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,
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, Book 280,
The Metals Society
,
London
,
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6.
Dowling
,
N. E.
in
Cyclic Stress-Strain and Plastic Deformation Aspects of Fatigue Crack Growth
, ASTM STP 637,
American Society for Testing and Materials
,
Philadelphia
,
1977
, pp. 97-121.
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,
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,
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,
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Beer
,
T. A.
, “
Crack Shapes During Biaxial Fatigue
,” M.S. thesis,
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign
,
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.
9.
Findley
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,
Journal of Engineering for Industry, Transactions
, American Society of Mechanical Engineers, Series B, Vol.
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,
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