A fully coupled constitutive model for electrostrictive ceramic materials
Book
·
OSTI ID:395191
- Martin Marietta Labs., Baltimore, MD (United States)
A three-dimensional, electromechanical constitutive law has been formulated for electrostrictive ceramic materials. This fully-coupled, phenomenological model relates the key state variables of stress, strain, electric field, polarization and temperature in a set of compact non-linear equations. The direct and converse electrostrictive effects are modeled by assuming that the electrically induced strain depends on second order polarization terms. In addition, a simple empirical relationship for the dielectric behavior is used to model the saturation of the induced polarization with increasing electric field. Unlike previous electrostrictive constitutive laws based on polynomial expansions, this constitutive law depends on a manageable number of material constants. Finally, predictions of the material`s mechanical behavior under constant electric field and its electrical behavior under constant applied stress are made.
- OSTI ID:
- 395191
- Report Number(s):
- CONF-940691--; ISBN 1-56676-171-9
- Country of Publication:
- United States
- Language:
- English
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