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Experimental Mechanics

Erschienen in:

17.04.2017

Elastic and Dielectric Properties of Active Ag/BaTiO₃ Composites

verfasst von: J. Xing, M. Radovic, A. H. Muliana

Erschienen in: Experimental Mechanics | Ausgabe 4/2018

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Abstract

This study examines the elastic and dielectric properties of active composites consisting of barium titanate (BaTiO₃) and silver (Ag) constituents using experimental and numerical approaches. The elastic constants including Young’s modulus, shear modulus and Poisson’s ratio were measured by resonant ultrasound spectroscopy (RUS), a nondestructive dynamic technique, while a dielectric (impedance) spectroscopy was used to measure the relative permittivity and dielectric loss at different frequencies. The dielectric tests were also conducted at temperature ranges from −50 to 200 °C where the two phase transformations of barium titanate at around 0 °C and 120 °C were examined. The experimental results in this study were compared to data available in the literature. In addition to the experimental work, a numerical method is also considered in order to study the effects of blending silver into barium titanate on the effective elastic and dielectric properties of the composite and the local field fluctuations. For this purpose, two micromechanics models describing the detailed composite microstructures were constructed. The first model is based on two dimensional (2D) images of realistic microstructures obtained by the scanning electronic microscopy (SEM), while the second model is based on randomly generated three-dimensional (3D) microstructures with spherical particles. The effects of loading direction, porosity, particle shape and dispersion were examined using the micromechanics models. Numerical predictions of the effective elastic and dielectric constants were compared to the experiment results.

Vorheriger Artikel Coupling Effect of State-of-Health and State-of-Charge on the Mechanical Integrity of Lithium-Ion Batteries

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Titel: Elastic and Dielectric Properties of Active Ag/BaTiO3 Composites
verfasst von: J. Xing
M. Radovic
A. H. Muliana
Publikationsdatum: 17.04.2017
Verlag: Springer US
Erschienen in: Experimental Mechanics / Ausgabe 4/2018
Print ISSN: 0014-4851
Elektronische ISSN: 1741-2765
DOI: https://doi.org/10.1007/s11340-017-0271-5

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