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ASTM Selected Technical Papers
Instrumented Impact Testing
By
TS DeSisto
TS DeSisto
1
Army Materials and Research Center
,
Watertown, Mass. 02172
;
symposium chairman
.
Search for other works by this author on:
ISBN-10:
0-8031-0738-2
ISBN:
978-0-8031-0738-0
No. of Pages:
220
Publisher:
ASTM International
Publication date:
1974

The effect of response time on instrumented Charpy impact data obtained on unidirectional Borsic-aluminum composites has been examined. It has been shown that the use of filters to eliminate high-frequency noise in the load-time traces obtained can significantly increase the response time of the testing system and lead to grossly inaccurate data. The current results indicate that as the response time is increased, the load is attenuated, the time to fracture is increased, and the absorbed energy is unaffected. The attenuation characteristics of the testing system can be documented through the use of a sine wave generator. These characteristics can be used both as a guide to ensure the adequacy of the system response time for future testing and as a means of correcting attenuated data which were obtained on a testing system with excessive filtering (inadequate response times).

1.
Wullaert
,
R. A.
,
Panel Discussion on Instrumented Impact Testing
, ASTM Annual Meeting,
Philadelphia, Pa.
,
American Society for Testing and Materials
,
06
1973
.
2.
Wullaert
,
R. A.
, in
Impact Testing of Metals, ASTM STP 466
,
American Society for Testing and Materials
,
1970
, pp. 148–164.
3.
Sever
,
W. L.
and
Tetelman
,
A. S.
, “
The Use of Pre-cracked Charpy Specimens to Determine Dynamic Fracture Toughness
,”
University of California
at
Los Angeles
, DAH-04-68-C-008,
1971
.
4.
Ireland
,
D. R.
,
Effects Technology, Inc.
, private communication,
1972
.
5.
Hoover
,
W. R.
Panel Discussion on Instrumented Impact Testing
, ASTM Annual Meeting,
Philadelphia, Pa.
,
American Society for Testing and Materials
,
06
1973
.
6.
Ireland
,
D. R.
Procedure for Reliable Control of the Instrument Impact Test
,” Effects Technology Inc. Technical Report 73-25,
07
1973
, presented at the Instrumented Impact Testing Symposium, ASTM Annual Meeting,
Philadelphia, Pa.
,
American Society for Testing and Materials
,
06
1973
.
7.
Hoover
,
W. R.
and
Allred
,
R. E.
, “
The Dynamic Fracture Behavior of Borsic-A1 Composites
,”
Sandia Laboratories
, SC-DC-721080,
06
1972
.
8.
Tentative Method of Test for Plane Strain Fracture Toughness of Metallic Materials (ASTM designation E-399-70T)
,”
Review of Developments in Plane Strain Fracture Toughness Testing, ASTM STP 463
,
Brown
,
W. F.
 Jr.
, ed.,
1970
, pp. 249–269.
9.
Tattersall
,
H. G.
and
Tappin
,
G.
,
Journal of Materials Science
 0022-2461, Vol.
1
,
1966
, pp. 296–301.
10.
Hoover
,
W. R.
and
Guess
,
T. R.
, “
The Dynamic Fracture Toughness of Carbon-Carbon Composites
,”
Sandia Laboratories
, SLA-73-0499,
04
1973
,
Hoover
,
W. R.
and
Guess
,
T. R.
,
Journal of Composite Materials
 0021-9983, Vol.
7
,
1973
, pp. 334–346.
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