Dynamic analysis of composite plates with delaminations under hygrothermal loads using finite strip method

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Abstract

In this paper the effect of hygrothermal conditions such as temperature and moisture on free vibration frequency of composite plate is investigated. In addition, the effect of different properties such as geometry of model, support conditions, plate thickness and orientation of layers on vibration of composite laminated plate is investigated. The finite strip method is used by trigonomic functions in longitudinal direction and polynomial functions in transverse direction. The first shear order deformation theory was used to consider the shear stress effect in thickness of plate. Finally, the effect of delamination of composite plates is considered and the effect of the amount and place of delamination are evaluated on free vibration frequency of laminated plates. The results show that considering the changing in tempreture and moisture of laminated plates is caused the big changing in natural frequency of free vibration of such plates, especially, when the delamination of layers are occoured.

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