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ASTM Selected Technical Papers
Progress in Flaw Growth and Fracture Toughness Testing
By
J. G. Kaufman
J. G. Kaufman
1
Aluminum Company of America
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J. L. Swedlow
J. L. Swedlow
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H. T. Corten
H. T. Corten
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J. E. Srawley
J. E. Srawley
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R. H. Heyer
R. H. Heyer
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E. T. Wessel
E. T. Wessel
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G. R. Irwin
G. R. Irwin
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ISBN:
978-0-8031-6660-8
No. of Pages:
504
Publisher:
ASTM International
Publication date:
1973

The effect of a loading sequence on the stress corrosion cracking of AISI 4340 steel and Ladish D6AC steel in an aqueous environment has been studied with double-cantilever beam specimens. The loading sequence was found to influence an incubation time period for the initiation of crack propagation as the stress intensity (K) changed. When the stress intensity was decreased during stress-corrosion testing, the incubation time was dependent upon the change in stress intensity and the final stress intensity (Kf). When the stress intensity was increased, an incubation time was not found. However, the loading sequence did not influence the steady-state crack growth rates. The loading sequence effect is shown to cause interpretation problems when specific time periods are used for the determination of the threshold stress intensity (KIscc), especially after the specimens have been prestressed.

1.
Dull
,
D. L.
and
Raymond
,
L.
, “
Stress History Effect on Incubation Time for Stress Corrosion Crack Growth in AISI 4340 steel
,”
Metallurgical Transactions
, Vol.
3
,
1972
, pp. 2943–2947.
2.
Troiano
,
A. R.
,
Transactions, American Society for Metals
, Vol.
52
,
1960
, pp. 54–80.
3.
Steigerwald
,
E. A.
,
Journal of the American Society for Testing and Materials
, Vol.
60
,
1960
, pp. 750–760.
4.
Tetelman
,
A. S.
in
Proceedings of the Conference on Fundamental Aspects of Stress Corrosion Cracking
,
National Association of Corrosion Engineers, Ohio State University
,
Columbus, Ohio
,
09
1967
.
5.
Elsea
,
A. R.
and
Fletcher
,
E. E.
,
Hydrogen Induced, Delayed, Brittle Failures of High Strength Steels
, DM1C Report 196,
Battelle Memorial Institute
, Baltimore, Md.,
01
1964
.
6.
Johnson
,
H. H.
,
Morlet
,
J. G.
, and
Troiano
,
A. R.
,
Transactions, Metallurgical Society of American Institute of Mining, Metallurgical, and Petroleum Engineers
, Vol.
212
,
1958
, pp. 528–36.
7.
Dull
,
D. L.
,
Buch
,
J. D.
, and
Raymond
,
L.
, “
Compliance Calibration of a Contoured and Face Grooved Double Cantilever Beam Specimen
,”
Engineering Fracture Mechanics
,
1972
, Vol.
4
, pp. 523–531.
8.
Beachem
,
C. D.
and
Brown
,
B. F.
in
Stress Corrosion Testing, ASTM STP 425
,
American Society for Testing and Materials
,
1967
, pp. 31–40.
9.
Van der Sluys
,
W. A.
,
Engineering Fracture Mechanics
, Vol.
1
,
1969
, pp. 447–462.
10.
Masters
,
J. N.
and
White
,
J. L.
,
Development of Fracture Toughness Properties of D6-AC Steel for F-111 Applications
, Technical Report TR-70-310,
Air Force Materials Laboratory, Wright-Patterson Air Force Base
, Ohio,
01
1971
.
11.
Fracture Mechanics Test and Analysis Presentation to Scientific Advisory Board
” FZM-12-2762, General Dynamics, Fort Worth, Tex.,
07
1970
.
12.
Carter
,
C. S.
,
Metallurgical Transactions
, Vol.
3
, pp. 584–586.
13.
Brown
,
W. F.
, Jr.
, and
Srawley
,
J. F.
in
Plane Strain Crack Toughness Testing of High-Strength Metallic Materials, ASTM STP 410
,
American Society for Testing and Materials
,
1966
, p. 12.
14.
Sullivan
,
A. M.
,
Engineering Fracture Mechanics
, Vol.
4
,
1972
, pp. 65–76.
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