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ASTM Selected Technical Papers
Crack Arrest Methodology and Applications
By
GT Hahn
GT Hahn
1
Vanderbilt University
,
Nashville, Tenn. 37235
;
editor
.
Search for other works by this author on:
MF Kanninen
MF Kanninen
2
Battelle Memorial Institute, Columbus Laboratories
,
Columbus, Ohio
;
43201
;
editor
.
Search for other works by this author on:
ISBN-10:
0-8031-0317-4
ISBN:
978-0-8031-0317-7
No. of Pages:
453
Publisher:
ASTM International
Publication date:
1980

Time-varying shear force measuring techniques have been used to investigate the dynamic critical stress-intensity factor versus crack propagation velocity curve. The product of the shear force at the loading end times the square root of the loading time on a rapidly wedged double cantilever beam specimen is uniquely related to the critical bending moment at the crack tip. Static compliance measurements on side-grooved specimens were incorporated into a Bernoulli-Euler beam model for calibration purposes and to eliminate the inappropriate built-in beam assumption. The compliance calibration shows a crack length shift from a measured crack length to a beam model length at a fixed compliance value. This shift does not affect the magnitude of the calculated critical bending moment at the crack tip when the load and the load-point displacement are measured quantities. The effective crack length is calculated from the beam model length with the length shift correction. The KId-values (calculated from the critical bending moment) versus crack velocity have been investigated at several test temperatures for a low-carbon steel. KId-values show a generally decreasing trend when crack velocity increases. KIc at fast fracture initiation is larger than the corresponding KId-value for all tests recorded.

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,
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, in
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, ASTM STP 627,
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,
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,
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, Vol.
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,
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,” AFML-TR-75-101,
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,
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,
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