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Nonlinear Response of the Macro Fiber Composite Actuator to Monotonically Increasing Excitation Voltage

Structures and Materials Technology Group, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, MS 299-101, Pasadena, CA 91109, USA; rowilli6{at}jpl.nasa.gov

Daniel J. Inman

Center for Intelligent Material Systems and Structures, Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061, USA

W. Keats Wilkie

Structures and Materials Technology Group, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, MS 299-101, Pasadena, CA 91109, USA

A nonlinear model for a piezoelectric continuum subjected to a monotonic increase in electric field under constant mechanical load is investigated. A general model is derived and then specialized for a piezoceramic-based material with anisotropic actuation and mechanical properties, for example, the Macro Fiber Composite (MFC) actuator. This formulation includes the linear-elastic mechanical response, as well as linear and second-order piezoelectric behavior and a second-order electromechanical cross-term. Using previously published work by the same authors (Williams, R.B., Inman, D.J. and Wilkie, W.K. 2004. "Tensile and Shear Behavior of Macro Fiber Composite Actuators," Journal of Composite Materials, 38(10):855—870) dealing with the mechanical response of the MFC, this set of material properties is determined experimentally in order to characterize the response of this device to given external loading conditions.

Key Words: nonlinear piezoelectric model • macro fiber composite • electrostrictive • elastostrictive

Journal of Intelligent Material Systems and Structures, Vol. 17, No. 7, 601-608 (2006)
DOI: 10.1177/1045389X06059501


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