Accession Number:

ADA261359

Title:

Investigation of Coupled Analysis Techniques for Adaptive Material Structural Systems

Descriptive Note:

Final technical rept. 15 Sep 1991-14 Sep 1992,

Corporate Author:

VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG

Personal Author(s):

Report Date:

1992-11-15

Pagination or Media Count:

111.0

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 actuatorstructure interaction. This model has been experimentally verified.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE