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1 May 1996 Material variability and performance predictions on an active composite panel
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Finite element analysis was performed on the preliminary design of a multilayered composite panel for acoustic suppression. The panel design features a circuit board, alumina and circuit board base layer structure. An square array of 64 piezoelectric actuators is mounted on this base. These actuators are divided into 16 groups of four actuators by 16 alumina cap plates. A thin kapton layer is placed over the cap layer. The final top layer and the area between actuators are a polymer filler material. Unit cell analysis of the design was performed to evaluate the effectiveness of the embedded actuators in producing surface deformations, the stresses generated in the actuator during actuation and the role of a thin glue layer, between the actuator and alumina cap plate, in mitigating high stresses. The results show that the cap plates become curved during deformation. This deformation is transmitted through the top polymer layer to the surface. This suggests that the effect of this surface profile on acoustic fields generated by the actuator array motion should be understood. Stresses in the actuator are found to be high without the glue layer, compared to known critical fracture stress values. Inclusion of the glue layer significantly reduced the stresses and is therefore an important consideration in the design.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Virginia G. DeGiorgi and Peter Matic "Material variability and performance predictions on an active composite panel", Proc. SPIE 2721, Smart Structures and Materials 1996: Industrial and Commercial Applications of Smart Structures Technologies, (1 May 1996);

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