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ASTM Selected Technical Papers
Dynamic Elastic Modulus Measurements in Materials
By
A Wolfenden
A Wolfenden
1
CSIRO
Division of Materials science and Technology Locked Bag 33
Clayton, Vic 3168
AUSTRALIA
on leave from Mechanical Engineering Department
Texas A & M University
?
College Station, TX 77843-3123
USA
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ISBN-10:
0-8031-1291-2
ISBN:
978-0-8031-1291-9
No. of Pages:
230
Publisher:
ASTM International
Publication date:
1990

An overview of an experimental program for determining the dynamic flexural constitution of materials is presented. This program entails the development of a fully-automated flexural apparatus, its calibration, and studies of structural damping and dynamic flexural modulus of a variety of materials. Furthermore, graphite/aluminum laminates, [±θ]s, with θ ranging from zero to ninety degrees in fifteen degree increments, were tested. Classical laminate theory and the work of Ni and Adams was found to adequately predict both the modulus and the damping. It is demonstrated that the attachment of an end-mass (to vary the resonant frequency) does not contribute to the measured damping.

1.
Wren
,
G.G.
, and
Kinra
,
V.K.
, “
An Experimental Technique for Determining a Measure of Structural Damping
,”
Journal of Testing and Evaluation
 0090-3973, Vol.
16
, No.
1
,
01
1988
, pp 77–85.
2.
Wren
,
G.G.
, and
Kinra
,
V.K.
, “
On The Effect of End-Mass on Damping
,” to appear in Experimental Mechanics.
3.
Kinra
,
V.K.
,
Petraitis
,
M.S.
, and
Datta
,
S.K.
, “
Ultrasonic Wave Propagation in a Random Particulate Composite
,”
International Journal of Solids and Structures
 0020-7683, Vol.
16
,
1980
, pp 301–312.
4.
Schapery
,
R.A.
, “
Viscoelastic Behavior and Analysis of Composite Materials
,” Composite Materials, Vol.
2
,
Sendecky
G.P.
editor,
Academic Press
,
New York
,
1974
.
5.
Read
,
B.E.
, and
Dean
,
G.D.
,
The Determination of Dynamic Properties of Polymers and Composites
,
Adam Hilger
,
Bristol, England
,
1978
.
6.
Zener
,
C.M.
,
Elasticity and Anelasticitv of Metals
,
University of Chicago Press
,
Chicago
,
1948
.
7.
Halpin
,
J.C.
,
Primer on Composite Materials
,
Technomic Publishing Co.
,
Lancaster
,
1984
.
8.
Ni
,
R.G.
, and
Adams
,
R.D.
, “
The Damping and Dynamic Moduli of Symmetric Laminated Composite Beams — Theoretical and Experimental Results
,”
Journal of Composite Materials
, Vol.
18
,
03
1984
, pp 104–121.
9.
Whitney
,
J.M.
,
Structural Analysis of Laminated Anisotropic Plates
,
Technomic Publishing Co.
,
Lancaster
,
1987
.
10.
Kimball
,
A.L.
, and
Schenectady
,
N.Y.
, “
Vibration Problems — Part V -Friction and Damping in Vibrations
,”
Journal of Applied Mechanics
 0021-8936,
09
1941
, pp A-135 to A-137.
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