Abstract

A biaxial extensometer for high temperature creep study is described. The axial displacement is measured by a linear variable differential transformer, the angular displacement by a rotary variable differential transformer. The possible interference between the axial and angular displacement measurements is minimized by using instrument linear motion ball bushing bearings and case hardened shafts. Examples of applications are given for a constant shear strain rate test and a creep test at 200°C under abrupt changes of stress states performed on a thin-walled tube specimen made of 2618 aluminum alloy.

Issue Section:
Research Papers
Keywords:
biaxial extensometer, sensitivity, constant shear strain rate test, creep test

References

1.
Rice
,
J. R.
, Ed., “
Solid Mechanics Research Trends and Opportunities
,”
Applied Mechanics Reviews
 0003-6900, Vol.
38
, No.
10
,
10
1985
.
2.
Findley
,
W. N.
 and
Gjelsvik
,
A.
, “
A Biaxial Testing Machine for Plasticity, Creep or Relaxation under Variable Principal-Stress Ratios
,” in
Proceedings
,
American Society for Testing and Materials
,
Philadelphia
, Vol.
62
,
1962
, pp.
1103
-
1118
.
3.
Blass
,
J. J.
 and
Findley
,
W. N.
, “
Short-Time Biaxial Creep of an Aluminum Alloy with Abrupt Changes of Temperature and State of Stress
,”
ASME Journal of Applied Mechanics
 0021-8936, Vol.
38
,
1971
, pp.
489
-
501
.
Google Scholar
Crossref
Search ADS
 
4.
Findley
,
W. N.
 and
Lai
,
J. S.
, “
Creep and Recovery of 2618 Aluminum Alloy under Combined Stress with a Representation by a Viscous-Viscoelastic Model
,”
ASME Journal of Applied Mechanics
 0021-8936, Vol.
45
,
1978
, pp.
507
-
514
.
Google Scholar
Crossref
Search ADS
 
5.
Cho
,
U. W.
 and
Findley
,
W. N.
, “
Creep and Creep Recovery of 3034 Stainless Steel under Combined Stress with a Representation by a Viscous-Viscoelastic Model
,”
ASME Journal of Applied Mechanics
 0021-8936, Vol.
47
,
1980
, pp.
755
-
761
.
Google Scholar
Crossref
Search ADS
 
6.
Ding
,
J. L.
 and
Findley
,
W. N.
, “
48 Hour Multiaxial Creep and Creep Recovery of 2618 Aluminum Alloy at 200°C
,”
ASME Journal of Applied Mechanics
 0021-8936, Vol.
51
,
1984
, pp.
125
-
132
.
Google Scholar
Crossref
Search ADS
 
7.
Ding
,
J. L.
 and
Findley
,
W. N.
, “
Nonproportional Loading Steps in Multiaxial Creep of 2618 Aluminum
,”
ASME Journal of Applied Mechanics
 0021-8936, Vol.
52
,
1985
, pp.
621
-
628
.
Google Scholar
Crossref
Search ADS
 
8.
Ding
,
J. L.
 and
Findley
,
W. N.
, “
Creep Experiments under Nonproportional Loadings with Stress Reversals for 2618 Aluminum
,”
ASME Journal of Engineering Materials and Technology
 0094-4289, Vol.
106
,
1984
, pp.
397
-
404
.
Google Scholar
Crossref
Search ADS
 
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