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ASTM Selected Technical Papers
Thermal Fatigue of Materials and Components
By
DA Spera
DA Spera
1
NASA Lewis Research Center
,
editor
Search for other works by this author on:
DF Mowbray
DF Mowbray
2
Mechanics of Materials Unit, Materials and Processes Laboratory, General Electric Company
,
Schenectady, N.Y.
;
symposium cochairman and also coeditor of this publication
.
Search for other works by this author on:
ISBN-10:
0-8031-0586-X
ISBN:
978-0-8031-0586-7
No. of Pages:
270
Publisher:
ASTM International
Publication date:
1976

A test method is described for performing uniaxial low-cycle thermal mechanical fatigue tests at elevated temperatures on nickel-base superalloys. Both smooth specimen crack initiation and notched specimen crack propagation testing is discussed. Standard closed loop servohydraulic testing machines with closed loop electric induction heaters are utilized. The temperature and mechanical strain are independently controlled, allowing for a wide range of relationships between temperature and mechanical strain.

Tubular specimens are directly inductively heated in air and cooled with compressed air. The temperature is measured with a radiation pyrometer which eliminates thermocouples and premature failures caused by welded thermocouples. Axial strain in the specimen is measured from machined internal ridges on the specimen utilizing a linear variable differential transformer and a quartz internal extensometer.

An electronic system compensates for the thermal expansion component of strain for both the control loop and the recorders. This system permits direct recording of the load-induced mechanical strain. Load-strain hysteresis loops and strain-temperature plots can simply be recorded during the test.

1.
Carden
,
A. E.
in
Manual on Low Cycle Fatigue Testing
, ASTM STP 465,
American Society for Testing and Materials
,
1970
pp. 163-188.
2.
Wells
,
C. H.
in
Manual on Low Cycle Fatigue Testing
, ASTM STP 465,
American Society for Testing and Materials
,
1970
, 87-99.
3.
Tishler
,
D. N.
and
Wells
,
C. H.
,
Materials Research and Standards
,
American Society for Testing and Materials
, Vol.
6
,
01
1966
, p. 20.
4.
Rau
,
C. A.
, Jr.
,
Gemma
,
A. E.
, and
Leverant
,
G. R.
in
Fatigue at Elevated Temperatures
, ASTM STP 520,
American Society for Testing and Materials
,
1973
, pp. 166-178.
5.
Gemma
,
A. E.
,
Langer
,
B. S.
,
Leverant
,
G. R.
, this publication, pp. 199-213.
6.
Erdogan
,
F .
and
Ratwani
,
M .
,
International Journal of Fracture Mechanics
 0376-9429, Vol.
6
, No.
4
,
12
1970
, pp. 379-392.
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