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Normally distributed free energy model and creep behavior of ferroelectric polycrystals at room and high temperatures

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Abstract

A constitutive model that can be used to predict creep behavior of ferroelectric polycrystals at room and high temperatures is proposed. The model consists of the Gibbs free energy function with normal distribution and a switching evolution law with critical driving force. Linear moduli in the free energy function and switching parameters in the switching law are assumed to be linearly dependent on temperature. A ferroelectric polycrystal is modeled by an agglomerate of 210 single crystallites. Compressive stress and electric field-induced creep behavior as well as polarization hysteresis and strain butterfly responses of the model are calculated and compared with experimental observations.

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Authors and Affiliations

  1. Department of Mechanical and Information Engineering, University of Seoul, Dongdaemun-gu, 130-743, Seoul, Republic of Korea

    Sang-Joo Kim

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  1. Sang-Joo Kim
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Correspondence to Sang-Joo Kim.

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Kim, SJ. Normally distributed free energy model and creep behavior of ferroelectric polycrystals at room and high temperatures. Acta Mech 223, 2091–2105 (2012). https://doi.org/10.1007/s00707-012-0693-1

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  • DOI: https://doi.org/10.1007/s00707-012-0693-1

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