Flexoelectric anisotropy and shear contributions in lead-free piezocomposites

IF 1.9 4区工程技术 Q3 MECHANICS

Mechanics Research Communications Pub Date : 2024-09-01 DOI:10.1016/j.mechrescom.2024.104321

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引用次数: 0

Abstract

Flexoelectricity is the coupling between strain gradients and electric fields. This phenomenon can significantly enhance piezocomposite response in addition to linear piezoelectricity. This enhancement is especially important for lead-free piezocomposites, which generally underperform compared to lead-based counterparts. Flexoelectric enhancement is facilitated by structural anisotropy in piezocomposites. However, challenges in modeling flexoelectric effects arise from several unknowns. Firstly, the shear flexoelectric coefficient is not well-characterized experimentally. Secondly, significant discrepancies exist between theoretical predictions and experimental measurements of flexoelectric coefficients. Thirdly, the influence of matrix mechanical properties on flexoelectric behavior is poorly understood. To address these issues, we construct a parametric flexoelectric model of a lead-free piezocomposite with graded inclusion concentration. We then systematically analyze the impact of each parameter to identify which significantly influence flexoelectric behavior. This study is intended to provide direction to further experimental studies towards understanding and tailoring this subset of parameters.

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无铅压电复合材料中的柔电各向异性和剪切贡献

挠电性是应变梯度与电场之间的耦合。除了线性压电性之外，这种现象还能显著增强压电复合材料的响应。这种增强对无铅压电复合材料尤为重要，因为与铅基压电复合材料相比，无铅压电复合材料的性能通常较差。压电复合材料中的结构各向异性可促进挠电增强。然而，建立挠电效应模型的挑战来自几个未知因素。首先，剪切挠电系数没有得到很好的实验表征。其次，理论预测与实验测量的挠电系数之间存在很大差异。第三，基体机械性能对挠电行为的影响还不甚了解。为了解决这些问题，我们构建了一个具有分级夹杂浓度的无铅压电复合材料的参数挠电模型。然后，我们系统地分析了每个参数的影响，以确定哪些参数会对挠电行为产生重大影响。这项研究旨在为进一步的实验研究提供方向，以了解和调整这些参数子集。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Mechanics Research Communications 物理-力学

CiteScore

4.10

自引率

4.20%

发文量

114

审稿时长

9 months

期刊介绍： Mechanics Research Communications publishes, as rapidly as possible, peer-reviewed manuscripts of high standards but restricted length. It aims to provide: • a fast means of communication • an exchange of ideas among workers in mechanics • an effective method of bringing new results quickly to the public • an informal vehicle for the discussion • of ideas that may still be in the formative stages The field of Mechanics will be understood to encompass the behavior of continua, fluids, solids, particles and their mixtures. Submissions must contain a strong, novel contribution to the field of mechanics, and ideally should be focused on current issues in the field involving theoretical, experimental and/or applied research, preferably within the broad expertise encompassed by the Board of Associate Editors. Deviations from these areas should be discussed in advance with the Editor-in-Chief.