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ASTM Selected Technical Papers
Cracks and Fracture
By
JL Swedlow
JL Swedlow
1
Carnegie-Mellon University
,
Pittsburgh, Pa. 15213
;
symposium co-chairman
.
Search for other works by this author on:
ML Williams
ML Williams
2
University of Pittsburgh
,
Pittsburgh, Pa. 15261
:
symposium co-chairman
.
Search for other works by this author on:
ISBN-10:
0-8031-0318-2
ISBN:
978-0-8031-0318-4
No. of Pages:
593
Publisher:
ASTM International
Publication date:
1976

A laser interferometry crack tip opening displacement measurement technique has been developed and is described here. This interferometric displacement gage was used to measure displacements near the crack tip in flawed specimens. Measured displacements were then converted to stress intensity factor calibration curves by means of the linear elastic fracture mechanics displacement equations. Application of this procedure to compact and edge-cracked aluminum specimens resulted in experimental stress intensity factor calibrations that agreed well with theoretical predictions for these two geometries.

1.
Broek
,
D.
,
Elementary Engineering Fracture Mechanics
,
Noordhoff International Publishing
,
The Netherlands
,
1974
.
2.
Tada
,
H.
,
Paris
,
P. C.
, and
Irwin
,
G. R.
,
The Stress Analysis of Cracks Handbook
,
Del Research Corporation
,
Hellertown, Pa.
,
1973
.
3.
Sih
,
G. C.
,
Handbook of Stress Intensity Factors
,
Lehigh University
,
Bethlehem, Pa.
,
1973
.
4.
Bubsey
,
R. T.
,
Fisher
,
D. M.
,
Jones
,
M. H.
, and
Srawley
,
J. E.
, “
Compliance Measurements
,”
Experimental Techniques in Fracture Mechanics
,
Kobayashi
A. S.
, Ed.,
The Iowa State University Press
,
Ames, Iowa
,
1973
.
5.
Marloff
,
R. H.
,
Leven
,
M. M.
,
Ringler
,
T. N.
, and
Johnson
,
R. L.
,
Experimental Mechanics
, Vol.
11
, No.
12
,
1971
, pp. 529-539.
6.
Hall
,
L. R.
and
Finger
,
R. W.
,
Proceedings
,
Air Force Conference on Fatigue and Fracture of Aircraft Structures and Materials
, Technical Report AFFDL-TR-70-144,
Wright-Patterson AFB
,
Ohio
,
09
1970
, pp. 235-262.
7.
James
,
L. A.
and
Anderson
,
W. E.
,
Journal of Engineering Fracture Mechanics
, Vol.
1
,
04
1969
, pp. 565-568.
8.
Paris
,
P. C.
and
Sih
,
G. C.
in
Symposium on Fracture Toughness Testing and Its Application
, ASTM STP 381,
American Society for Testing and Materials
,
1965
pp. 30-81.
9.
Kobayashi
,
A. S.
,
Experimental Techniques in Fracture Mechanics
,
The Iowa State University Press
,
Ames, Iowa
,
1973
.
10.
Adams
,
N. J. I.
,
Engineering Fracture Mechanics
 0013-7944, Vol.
4
,
1971
, pp. 543-554.
11.
Elber
,
W.
in
Damage Tolerance in Aircraft Structures
, ASTM STP 486,
American Society for Testing and Materials
,
1971
, pp. 230-242.
12.
Dudderar
,
T. D.
and
Gorman
,
H. J.
,
Experimental Mechanics
, Vol.
13
, No.
4
,
1973
, pp. 145-149.
13.
Sommer
,
E.
,
Engineering Fracture Mechanics
 0013-7944, Vol.
1
,
1970
, pp. 705-718.
14.
Crosely
,
P. B.
,
Mostovoy
,
S.
, and
Ripling
,
E. J.
,
Engineering Fracture Mechanics
 0013-7944, Vol.
3
,
1971
, pp. 421-433.
15.
Evans
,
W. T.
and
Luxmore
,
A.
,
Engineering Fracture Mechanics
 0013-7944, Vol.
6
,
1974
, pp. 735-743.
16.
Sharpe
,
W. N.
, Jr.
and
Grandt
,
A. F.
, Jr.
, “
A Laser Interferometric Technique for Crack Surface Displacement Measurements
,”
Proceedings
,
20th International Instrumentation Symposium on the Instrument Society of America
,
Albuquerque, N. Mex.
,
05
1974
.
17.
Sharpe
,
W. N.
, Jr.
and
Grandt
,
A. F.
, Jr.
in
Mechanics of Crack Growth
, ASTM STP 590,
American Society for Testing and Materials
, pp. 302-320.
18.
Sharpe
,
W. N.
, Jr.
,
International Journal of Nondestructive Testing
 0020-7470, Vol.
3
,
1971
, pp. 56-76.
19.
Jenkins
,
F. A.
and
White
,
H. E.
,
Fundamentals of Optics
,
McGraw-Hill
,
New York
,
1957
.
20.
Gross
,
B.
,
Srawley
,
J. E.
, and
Brown
,
W. F.
, Jr.
, “
Stress Intensity Factors for a Single-Edge-Notch Tension Specimen by Boundary Collocation of a Stress Function
,”
NASA Technical Note
 D-2395,
National Aeronautics and Space Administration
,
1964
.
21.
Wessel
,
E. T.
, “
State of the Art of the WOL Specimen for KIC Fracture Toughness Testing
,”
Engineering Fracture Mechanics
 0013-7944, Vol.
1
, No.
1
,
06
1968
.
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