Investigation of Coupled Analysis Techniques for Adaptive Material Structural Systems
Abstract
The objective of this research program is to investigate coupled analysis techniques for adaptive material structural systems. There are two aspects of this research: one is to develop a nonlinear full-field constitutive model for ferroelectric materials, including piezoelectric and electrostrictive materials; the other is to develop an impedance-based analysis technique for adaptive material systems. A coupled electro-thermal-mechanical nonlinear constitutive relation for piezoelectric materials has been developed and verified based on experimental data from the literature. This model uses the polarization fraction as a newly established internal variable. This internal variable is related to other parameters such as electric field, stress, frequency, etc., using a hyperbolic tangent function, which accurately describes the nonlinearity, including the hysteresis of ferroelectric materials. The same approach has also been utilized in the modeling of relaxor ferroelectric PMN-PT materials. An impedance methodology for the dynamic analysis of adaptive material systems has been developed. This approach can provide accurate theoretical prediction of the dynamic response of a structure driven by any type of actuator and yet reflect the physical essence of the actuator/structure interaction. This model has been experimentally verified.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 15, 1992
- Accession Number
- ADA261359
Entities
People
- Craig A. Rogers
Organizations
- Virginia Tech