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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

A method of performing torsional low cycle fatigue tests on thin-walled tubular specimens is described. Shear strains are measured and controlled using an internally mounted rotary variable differential transducer (RVDT). Test results for a 1045 hot-rolled and normalized steel are discussed.

As in the case of uniaxial fatigue analysis, power law relationships are assumed in the elastic strain-life, plastic strain-life, and stress-plastic strain functions. From this analysis, the fatigue strength and ductility exponents and coefficients in torsion are determined, as well as the cyclic strain hardening exponent and strength coefficient in torsion. These properties are compared to those obtained in uniaxial fatigue tests of the same steel. The question of whether the cyclic strain hardening, fatigue strength, and fatigue ductility exponents are stress state dependent is specifically addressed. This is one of the fundamental issues that must be resolved if uniaxial fatigue properties are to be used to analytically predict multiaxial fatigue behavior.

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,”
Advances in Engineering
, Vol.
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,
Society of Automotive Engineers
,
Warrendale, PA
,
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,
D. F.
and
Morrow
,
JoDean
, “
Review of Contemporary Approaches to Fatigue Damage Analysis
,” FCP Report No. 24,
College of Engineering, University of Illinois
, Urbana, IL,
12
1976
.
3.
Dowling
,
N. E.
, “
Torsional Fatigue Life of Power Plant Equipment Rotating Shafts
,” DOE/RA/29353-1,
U.S. Department of Energy
,
Washington, DC
09
1982
.
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Yokobori
,
T.
,
Yamanouchi
,
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, and
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,
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,
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, Vol.
1
, No.
I
,
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,
D. R.
and
Downing
,
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, this publication, pp. 24-32.
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Curless
,
G. L.
,
Deere & Company Technical Center
, Moline, IL, personal communication,
1982
.
7.
Dowling
,
N. E.
,
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.
8.
Socie
,
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,
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,
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, and
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,
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, this publication, pp. 463-481.
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Deere & Company Technical Center
, Internal Report T-1676, Moline, IL,
05
02
1982
.
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