In the first part of this paper we describe measurements of the radiation pattern of the acoustic emission (AE) signals emitted when a penny‐shaped crack of Mode I type is generated in a glass plate by pressing a rigid conical indenter onto the surface. It is shown that the orientation of a crack determined from the radiation pattern of the emitted AE signals is in agreement to within several degrees with a direct optical determination.

1.
B. R.
Lawn
 and
M. V.
Swain
,
J. Mater. Sci.
10
,
113
(
1975
).
Google Scholar
Crossref
Search ADS
 
2.
I. N.
Sneddon
,
Proc. Cambridge Philos. Soc.
44
,
492
(
1948
).
Google Scholar
Crossref
Search ADS
 
3.
K. Y.
Kim
 and
W.
Sachse
,
J. Appl. phys.
55
,
2847
(
1984
).
Google Scholar
Crossref
Search ADS
 
4.
K. Y. Kim and W. Sachse, in Progress in Acoustic Emission II, edited by M. Onoe, K. Yamaguchi, and H. Takahashi (Japanese Society for Nondestructive Inspection, Tokyo, 1984), pp. 163–172.
5.
Y. H. Pao and R. R. Gajewski, in Physical Acoustics, edited by W. P. Mason and R. N. Thurston (Academic, New York, 1979), Vol. 13, pp. 183–265.
6.
A. N.
Ceranoglu
 and
Y. H.
Pao
,
J. Appl. Mech.
48
,
125
(
1981
);
Google Scholar
Crossref
Search ADS
 
A. N.
Ceranoglu
 and
Y. H.
Pao
,
48
,
133
(
1981
);
A. N.
Ceranoglu
 and
Y. H.
Pao
,
48
,
139
(
1981
).
7.
K. Y.
Kim
 and
W.
Sachse
,
J. Appl. Phys.
59
,
2711
(
1986
).
Google Scholar
Crossref
Search ADS
 
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© 1986 American Institute of Physics.
1986
American Institute of Physics
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