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Proceedings Paper

Material variability and performance predictions on an active composite panel
Author(s): Virginia G. DeGiorgi; Peter Matic
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Paper Abstract

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.

Paper Details

Date Published: 1 May 1996
PDF: 11 pages
Proc. SPIE 2721, Smart Structures and Materials 1996: Industrial and Commercial Applications of Smart Structures Technologies, (1 May 1996); doi: 10.1117/12.239129
Show Author Affiliations
Virginia G. DeGiorgi, Naval Research Lab. (United States)
Peter Matic, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 2721:
Smart Structures and Materials 1996: Industrial and Commercial Applications of Smart Structures Technologies
C. Robert Crowe, Editor(s)

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