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ASTM Selected Technical Papers
Short Fiber Reinforced Composite Materials
By
BA Sanders
BA Sanders
1
General Motors Manufacturing Development, GM Technical Center
,
Warren, Michigan
;
editor
Search for other works by this author on:
ISBN-10:
0-8031-0697-1
ISBN:
978-0-8031-0697-0
No. of Pages:
271
Publisher:
ASTM International
Publication date:
1982

This paper describes measurements of dynamic stiffness and internal damping (that is, the complex moduli) of automotive fiber-reinforced plastics over the frequency range 10 to 1000 Hz at maximum strain amplitudes up to 0.0017. Three types of chopped E-glass fiber-reinforced polyester composites and two types of hybrid chopped/continuous fiber-reinforced polyester composites are tested, along with neat resin samples. Complex moduli are measured by using a forced flexural vibration technique. Materials having the greatest stiffness are generally found to have the lowest damping, and vice versa. The complex moduli of all materials are found to be essentially independent of frequency and amplitude within the ranges investigated. Damping in the composites is at least one order of magnitude greater than the damping in an aluminum calibration specimen.

1.
Heimbuch
,
R. A.
and
Sanders
,
B. A.
, “
Mechanical Properties of Automotive Chopped Fiber Reinforced Plastics
,” in
Composite Materials in the Automobile Industry
,
Kulkarni
S. V.
,
Zweben
C. H.
, and
Pipes
R. B.
, Eds.,
American Society of Mechanical Engineers
,
1978
, pp. 111-139.
2.
Gibson
,
R. F.
,
Yau
,
A.
,
Mende
,
E. W.
,
Osborn
,
W. E.
, and
Riegner
,
D. A.
, “
The Influence of Environmental Conditions on the Vibration Characteristics of Chopped Fiber Reinforced Composite Materials
,” in
Proceedings
,
22nd Structures, Structural Dynamics and Materials Conference (AIAA/ASME/ASCE/AHS)
, Part 1,
1981
, pp. 333-340.
3.
Lazan
,
B. J.
,
Damping of Materials and Members in Structural Mechanics
,
Pergamon Press
,
Oxford
,
1968
.
4.
Gibson
,
R. F.
and
Plunkett
,
R.
,
Experimental Mechanics
, Vol.
11
, No.
8
,
08
1977
, pp. 297-302.
5.
Granick
,
N.
and
Stern
,
J. E.
, “
Material Damping of Aluminum by a Resonant Dwell Technique
,” NASA TN-D-2893,
1965
.
6.
Gibson
,
R. F.
and
Plunkett
,
R.
,
Journal of Composite Materials
 0021-9983, Vol.
10
,
10
1976
, pp. 325-341.
7.
Crandall
,
S. H.
, “
On Scaling Laws for Material Damping
,” NASA TN D-1467,
1962
.
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