Nonlinear Tensile and Shear Behavior of Macro Fiber Composite Actuators

Author:

Williams R. Brett1,Inman Daniel J.1,Schultz Marc R.2,Hyer Michael W.2,Wilkie W. Keats3

Affiliation:

1. CIMSS Department of Mechanical Engineering

2. Department of Engineering Science and Mechanics Virginia Polytechnic Institute and State University Blacksburg, VA 24061, USA

3. Structural Dynamics Branch NASA Langley Research Center Hampton, VA 23681, USA

Abstract

The Macro Fiber Composite (MFC) actuator, developed at the NASA Langley Research Center, offers much higher flexibility and induced strain levels (~2000μσ, peak-to-peak) than its monolithic piezoceramic predecessors. The focus of this work is twofold; to measure the four independent linear elastic engineering constants of the orthotropic MFC actuator under short-circuit electrical boundary conditions using standard tensile testing procedures, and to use these experimental results to characterize the nonlinear tensile and shear stress–strain behavior and Poisson effects using various plastic deformation models. The results can then be readily incorporated into the piezoelectric constitutive equation and ultimately into structural actuation models that accurately consider nonlinear mechanical behavior.

Publisher

SAGE Publications

Subject

Materials Chemistry,Mechanical Engineering,Mechanics of Materials,Ceramics and Composites

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