Mr. Justin Costley Profile

Justin Costley

at Virginia Commonwealth Univ

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Proceedings Article | 21 July 2004 Paper

Piezoelectric behavior of pre-stressed curved actuators under load

Karla Mossi, Justin Costley, Zoubeida Ounaies, Robert Bryant

Proceedings Volume 5387, (2004) https://doi.org/10.1117/12.540026

KEYWORDS: Actuators, Ferroelectric materials, Ceramics, Composites, Polarization, Fiber optics sensors, Aluminum, Adhesives, Fiber lasers, Polymers

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Pre-stressed curved actuators typically consist of a piezoelectric ceramic (lead zirconate titanate or PZT) laminated between various layered materials. In one configuration, THUNDER, the bottom layer is stainless steel and the top layer is aluminum; the metallic layers are attached to the PZT ceramic using a polymeric adhesive. In another configuration, Lipca-C2, the layers comprise a glass/epoxy composite and a carbon/epoxy composite. Experimental and numerical results of displacement performance under unloaded conditions have been investigated in the past. The results show that the Lipca-C2 devices produced more displacement than the THUNDER devices when clamped and unloaded. The present study includes a comparative performance of both devices under load to evaluate their lifting capability. Both out-of-plane and in-plane displacements are assessed as a function of load and voltage at low frequency. A non-contact laser was used for the out-of-plane measurements simultaneously with an optic fiber for in-plane displacement at 0 to 5N load values. The load is attached to one end of the actuators, and to avoid possible damage to the actuators, it is moved through a mechanism that utilizes a frictionless linear bearing and a pulley.

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