Meena, Manish Kumar ; Kumar, Manish ; Kodumudi Venkataraman, Lalitha ; Patel, Satyanarayan (2021):
Thermomechanical analysis of 0.94Na1/2Bi1/2TiO3-0.06BaTiO3/ZnOcomposites usingfinite element method.
In: Journal of Alloys and Compounds, 854, pp. 1-12. Elsevier, ISSN 0925-8388,
DOI: 10.1016/j.jallcom.2020.157161,
[Article]

Abstract

Object-orientedfinite element (OOF2) analysis has been carried out on composites constituting of 0.94Na0.5Bi0.5TiO3-0.06BaTiO3(NBT-6BT) matrix phase and ZnO inclusions (4%, 7.5%, 10.78%, and 14% byvolume). The effect of ZnO inclusions on the thermomechanical properties of NBT-6BT is investigated andthe results are compared with theoretical methods. The thermal stress and strain variation are analyzedunder the homogeneous and heterogeneous temperature conditions as a function of volume fraction ofthe inclusions. The residual stresses localized at the NBT-6BT/ZnO interface are evaluated using the realmicrostructure of the composite (SEM micrographs), thus providing an actual spatial distribution ofstress in the material. In the case of a gradient temperature application, orientation of the grain alsovaries the stress concentration. Based on the above, the depolarization temperature of the composite canbe further improved if the ZnO nano-wire/nano-rods are used instead of ZnO nanoparticle/powder(depending on the orientation of nanowire). Further, the elastic loading conditions mimic the experi-mental response and as expected, material failure initiates at the pores thus validating the model.

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