Introduction: Smart structures equipped with piezoelectric devices to sense and actuate the structure could be used in many engineering applications. To explore the smart structure further and apply it to more complex structures, some problems are critical to be concerned. Among them, delamination due to the high stress is an important issue since its serious effect on the strength and stiffness of the composite structure. Method: In this investigation, a piezoelectric layer is embedded into the host structure to form a sandwich composite structure. The piezoelectric layer is subjected to an electric voltage, yielding the bending effect on the sandwich composite structure. A theoretical model based on the Euler beam theory and interfacial continuity is presented to determine the stresses of the sandwich composite beam caused by the piezoelectric layer. Results: The influences of the embedded depth and Young's modulus of the piezoelectric layer on the stress distribution of the sandwich composite beam are investigated through a parametric study. The analytical solutions are verified by the finite element method. Good agreement is achieved between the present approach and the finite element method. Conclusions: Numerical analysis indicates that the maximum tensile stresses in the top and bottom layers are decreasing with the increase of the embedded depth, while the maximum compressive stress in the lead zirconate titanate layer is increasing with the increase of the embedded depth. Both the top and bottom layers are subjected to tensile stress and increasing with the increase of the Young's modulus ratio, while the piezoelectric layer is subjected to compressive stress and increasing with the increase of the Young's modulus ratio.
In this work, piezoelectric (PZT) actuators were surface bonded on or embedded in a composite laminate and subjected to an electric voltage across the thickness, resulting in a bending effect on the composite laminate. An analytical expression of the deflection of a simply supported cross-ply composite laminate induced by distributed piezoelectric actuators was derived on the basis of classical plate theory and composite mechanics. The theoretical solution can be used to predict the deformation of the composite laminate. Series of parametric studies were performed to investigate the effects of location, size, and embedded depth of PZT actuators on the composite laminate deformation. The analytical predictions were verified with finite element results. A close agreement was achieved. It demonstrated that the present approach provided a simple solution to predict and control the deformed shape of a composite laminate induced by distributed PZT actuators.
Piezoelectric (PZT) actuators bonded on a structure can be used to generate deformation and excite vibration for the shape control and vibration suppression, respectively. This article proposes a theoretical model for predicting vibrational response of a composite laminate plate with PZT actuators. The bending moment induced by the PZT actuator was obtained and applied on the composite laminate plate. Utilizing composite mechanics and plate theory, an analytical solution of the vibrational response of a composite laminate plate excited by the PZT actuator with oscillating voltage was derived. Furthermore, the finite element analysis using ANSYS software (2019 version) was carried out to compare with the proposed model with a good agreement. A parametric study was performed to investigate the influences of PZT location and frequency on the vibration. Numerical results illustrate that mode can be selectively excited provided the PZT actuator is placed in an appropriate location. Moreover, the proposed model was employed to predict the effectiveness of vibration suppression by distributed PZT actuators. The novelty of this work is that a complicated coupling problem between the composite plate and bonded PZT actuator is resolved into two simple problems, leading to a simple analytical solution for the vibrational response of a composite plate induced by PZT actuators. The proposed model has been successfully demonstrated its applications on the vibration excitation and suppression of a composite laminate plate.
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