Damped vibrations of orthotropic square plates having variable thickness (linear variation)
About: This article is published in Journal of Sound and Vibration.The article was published on 1988-02-08. It has received None citations till now. The article focuses on the topics: Orthotropic material & Square (algebra).
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TL;DR: In this paper, a series of tests using unidirectional and π/4 Graphite T-300 Fiberite 1034 composites were performed in the temperature range 300-425 K with the material submerged both in moist air (humidity 0 to 100%) and in water.
Abstract: Expressions are presented for the moisture distribution and the mois ture content as a function of time of one dimensional homogeneous and composite materials exposed either on one side or on both sides to humid air or to water. The results apply during both moisture absorption and desorption when the moisture content and the temperature of the environ ment are constant. Test procedures are described for determining experi mentally the values of the moisture content and the diffusivity of com posite materials. A series of tests using unidirectional and π/4 Graphite T-300 Fiberite 1034 composites were performed in the temperature range 300—425 K with the material submerged both in moist air (humidity 0 to 100%) and in water. The test data support the analytical results and pro vide the moisture absorption and desorption characteristics of such com posites. Extension of the results to materials exposed to time varying envi ronmental conditions is indicated.
1,149 citations
TL;DR: In this paper, a rationale for determining the optimal laminate design for a thin plate consisting of multiple layers of equi-thickness composite material is presented for maximization of the fundamental frequency of small-amplitude, free flexural vibration.
124 citations
TL;DR: In this paper, a variational model for a laminated plate consisting of an arbitrary number of fiber-reinforced composite material layers has been developed, using the variational principles.
Abstract: Governing equations of motion for a laminated plate consisting of an arbitrary number of fiber-reinforced composite material layers have been developed, using the variational principles. Each layer was considered to be of an orthotropic material with its directional elastic properties depending on the fiber orientation. The extension, bending, inplane shear, and transverse shear deformations in each separate layer were considered. The analytical results were verified with the literature-reported data. A study of the optimum fiber orientations in a criss-cross laminated plate has shown that different fiber orientations lead to the maximum frequency and the maximum damping. For a cross-ply laminated plate, the maximum flexural frequency ratio has been obtained for large aspect ratio plates and with large values of elastic modular ratio E11/E22. The maximum loss factor for a cross-ply plate was obtained with square plate and with small values of E11/E22. 15 references.
96 citations