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) : Rogers, Craig A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a261359.pdf


Report Date : 15 Nov 1992


Pagination or Media Count : 111


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.


Descriptors :   *PIEZOELECTRIC MATERIALS , *FERROELECTRIC MATERIALS , *COUPLINGS , STRESSES , FREQUENCY , FUNCTIONS , METHODOLOGY , TEMPERATURE , POLARIZATION , EXPERIMENTAL DATA , PREDICTIONS , MODELS , INTERACTIONS , DYNAMICS , PARAMETERS , MATERIALS , DYNAMIC RESPONSE , STRUCTURES , ELECTRIC FIELDS , VARIABLES , APPROACH , HYPERBOLAS , HYSTERESIS , ELECTROSTRICTION , SPECIAL FUNCTIONS(MATHEMATICS) , IMPEDANCE , ACTUATORS , TANGENTS , CERAMIC MATERIALS , NONLINEAR SYSTEMS , ELECTROMECHANICAL DEVICES , RESPONSE , INTERNAL


Subject Categories : Ceramics, Refractories and Glass
      Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE