Hygrothermal effects on structural stiffness and structural damping of laminated composites |
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Authors: | Hacene Bouadi C T Sun |
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Affiliation: | (1) Department of Engineering Sciences, University of Florida, 32611 Gainesville, Florida, USA |
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Abstract: | In this paper the hygrothermal effects on structural stiffness and damping of laminated composites are investigated. Since the hygrothermal influence on properties of composite materials is primarily matrix dominated, we first determine experimentally the effects of temperature and moisture on the storage modulus, Poisson's ratio and material damping of the epoxy matrix. With the experimentally determined properties of the epoxy material, we then determine the complex moduli (E
L
*
,E
T
*
,G
LT
*
andv
LT
*
) of unidirectional glass-epoxy and graphite-epoxy composites. The structural stiffness (extensional and flexural) and damping of symmetric angle-ply laminates of glass-epoxy and graphite-epoxy are then investigated both analytically and experimentally for temperatues of 20° C and 80° C, respectively. Three moisture contents which are the dry, saturated and a non-uniform moisture gradient states corresponding to each temperature case are considered. Numerical and limited experimental results show that the effects of moisture on the real part ofA
11
*
,A
66
*
,D
11
*
andD
66
*
at room temperature, 20° C, are negligible for all the considered cases. But as temperature increases, the moisture and temperature combined influence induces significant changes in the complex stiffnessA
11
*
A
66
*
,D
11
*
, andD
66
*
especially for the matrix dominated terms. |
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Keywords: | |
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