无序颗粒中差异生长的连续介质力学。

IF 2.9 3区 化学 Q3 CHEMISTRY, PHYSICAL
Soft Matter Pub Date : 2025-06-06 DOI:10.1039/D4SM01429D
Noemie S. Livne, Tuhin Samanta, Amit Schiller, Itamar Procaccia and Michael Moshe
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引用次数: 0

摘要

无序颗粒物质表现出占据流体和固体边界的力学响应,在连续体理论框架内缺乏完整的描述。最近的研究表明,在准静态极限下,无序固体对外部扰动的力学响应是异常的,可以用“奇偶极子筛选”理论准确预测。在这项工作中,我们研究了响应性颗粒物质,其中颗粒大小随着湿度、温度或其他因素的刺激而变化。我们发展了奇偶极子筛选的几何理论,将生长场纳入平衡方程。我们的理论预测了一个响应于非均匀生长场的异常位移场,通过颗粒物质的分子动力学模拟证实了这一点。虽然我们的理论中的筛选参数是现象学的,而不是从微观物理推导出来的,但我们发现奇数参数和泊松比之间存在令人惊讶的关系。该理论适用于各种实验方案,包括导致空间变化的膨胀场的不均匀加热或润湿。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Continuum mechanics of differential growth in disordered granular matter

Continuum mechanics of differential growth in disordered granular matter

Disordered granular matter exhibits mechanical responses that occupy the boundary between fluids and solids, lacking a complete description within a continuum theoretical framework. Recent studies have shown that, in the quasi-static limit, the mechanical response of disordered solids to external perturbations is anomalous and can be accurately predicted by the theory of “odd dipole screening.” In this work, we investigate responsive granular matter, where grains change size in response to stimuli such as humidity, temperature, or other factors. We develop a geometric theory of odd dipole-screening, incorporating the growth field into the equilibrium equation. Our theory predicts an anomalous displacement field in response to non-uniform growth fields, confirmed by molecular dynamics simulations of granular matter. Although the screening parameters in our theory are phenomenological and not derived from microscopic physics, we identify a surprising relationship between the odd parameter and Poisson's ratio. This theory has implications for various experimental protocols, including non-uniform heating or wetting, which lead to spatially varying expansion fields.

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来源期刊
Soft Matter
Soft Matter 工程技术-材料科学:综合
CiteScore
6.00
自引率
5.90%
发文量
891
审稿时长
1.9 months
期刊介绍: Soft Matter is an international journal published by the Royal Society of Chemistry using Engineering-Materials Science: A Synthesis as its research focus. It publishes original research articles, review articles, and synthesis articles related to this field, reporting the latest discoveries in the relevant theoretical, practical, and applied disciplines in a timely manner, and aims to promote the rapid exchange of scientific information in this subject area. The journal is an open access journal. The journal is an open access journal and has not been placed on the alert list in the last three years.
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