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ASTM Selected Technical Papers
Fracture Analysis: Proceedings of the 1973 National Symposium on Fracture Mechanics, Part II
By
GR Irwin
GR Irwin
1Dept. of Mechanical Engineering,
University of Maryland
, College Park,
Md.
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ISBN-10:
0-8031-0361-1
ISBN:
978-0-8031-0361-0
No. of Pages:
261
Publisher:
ASTM International
Publication date:
1974

Prior collocation results are combined with new collocation data and analyzed using two parameter data approximation methods and fracture mechanics methods. A general K calibration is obtained for C-shaped specimens which have outer to inner radius ratios, W = r2/r1, between 1.4 and 2.5.

The K calibration for C-shaped specimens is found to depend on the load eccentricity to specimen thickness ratio, x/t, as well as the usual crack depth to specimen thickness ratio, a/t. The K results are presented as tabular and plotted values from a cubic spline surface used to approximate the collocation data and as a polynomial approximation of the collocation data over a more limited range of x/t.

1.
Kendall
,
D. P.
and
Hussain
,
M. A.
,
Experimental Mechanics
 0014-4851, Vol.
12
,
04
1972
, pp. 184–189.
2.
Hussain
,
M. A.
,
Lorensen
,
W. E.
,
Kendall
,
D. P.
, and
Pu
,
S. L.
, “
A Modified Collocation Method For C-Shaped Specimens
,”
Benet Weapons Laboratory
Technical Report, R-WV-T-X-6-73, Watervliet, N. Y.,
02
1973
.
3.
Gross
,
B.
,
Srawley
,
J. E.
, and
Brown
,
W. F.
, “
Stress-Intensity Factors For A Single-Edge-Notch Tension Specimen By Boundary Collocation Of A Stress Function
,” NASA Technical Note D-2395,
08
1964
.
4.
Hussain
,
M. A.
and
Pu
,
S. L.
,
Benet Weapons Laboratory
, Watervliet, N. Y., unreported results.
5.
Ahlberg
,
J. H.
,
Nilson
,
E. N.
, and
Walsh
,
J. L.
,
The Theory of Splines and Their Applications
,
Academic Press
,
New York
,
1967
.
6.
Brown
,
W. F.
, Jr.
and
Srawley
,
J. E.
in
Plane Strain Crack Toughness Testing of High Strength Metallic Materials, ASTM STP 410
,
American Society for Testing and Materials
,
1966
.
7.
Scanlon
,
R. D.
, “
An Interpolating Cubic Spline Fortran Subroutine
,”
Benet R&E Laboratories
Technical Report WVT-7010, Watervliet, N. Y.,
01
1970
.
8.
Kendall
,
D. P.
,
Underwood
,
J. H.
, and
Winters
,
D. C.
, “
Fracture Toughness and Crack Growth Measurements with “C” Shape Specimens
,”
Benet Weapons Laboratory
Technical Report, R-WV-T-6-39-73, Watervliet, N. Y.,
10
1973
.
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