arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.10903cond-mat.softcond-mat.stat-mech
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带电颗粒系统的塑性不稳定性:弹性与静电的竞争

Plastic Instabilities in Charged Granular Systems: Competition between Elasticity and Electrostatics

Prasenjit Das, H. George E. Hentschel, Itamar Procaccia

摘要:

静电理论保留电荷,但允许偶极激发。弹性理论保留偶极,但允许四极(Eshelby样)塑性事件。带电的非晶颗粒系统是有趣的,在他们自己的权利,在这里,我们专注于他们的塑性不稳定性,并检查他们的机械响应外部应变和外部电场,暴露弹性和静电之间的竞争。本文提出了一个通用模型,其机械不稳定性进行了检查,并提出了理论分析。塑性不稳定性作为鞍结分叉进行了讨论,可以完全理解的特征值和特征函数的相关海森矩阵。该系统展示了描述电极化的强度和应力如何受应变和电场影响的模量。这些模量的理论表达式提供和比较的数值模拟中的测量。

英文摘要:

Electrostatic theory preserves charges, but allows dipolar excitations. Elasticity theory preserves dipoles, but allows quadrupolar (Eshelby like) plastic events. Charged amorphous granular systems are interesting in their own right; here we focus on their plastic instabilities and examine their mechanical response to external strain and to external electric field, to expose the competition between elasticity and electrostatics. In this paper a generic model is offered, its mechanical instabilities are examined and a theoretical analysis is presented. Plastic instabilities are discussed as saddle-node bifurcations that can be fully understood in terms of eigenvalues and eigenfunctions of the relevant Hessian matrix. This system exhibits moduli that describe how electric polarization and stress are influenced by strain and electric field. Theoretical expression for these moduli are offered and compared to the measurements in numerical simulations.

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