X-ray computerized tomography observation of Lycopodium paste incorporating memory of shaking
X-ray computerized tomography observation of Lycopodium paste incorporating memory of shaking
复制标题
摇动记忆石松膏的X射线计算机断层扫描观察
DOI：
10.1103/physreve.105.044902
复制
发表时间：
2022
影响因子：
2.4
通讯作者：
Akio Nakahara,
中科院分区：
文献类型：
--
作者：
So Kitsunezaki;Akihiro Nishimoto;Tsuyoshi Mizuguchi;Yousuke Matsuo;Akio Nakahara,
在由颗粒材料和液体的混合物组成的均匀层中，已知干燥裂纹表现出各种各向异性图案，这些图案取决于层在干燥之前经历的振动的性质。这种效应的存在意味着关于振动方向的信息作为一种记忆保留在粒状颗粒的排列中。在这项工作中，我们使用微焦点X射线计算机断层扫描（）在由石松粉组成的糊状物中进行测量，以研究颗粒的三维排列。我们发现振动引起的各向异性安排的相邻粒子和密度波动形成的间隙主要在较低的一部分层。我们比较观察到的这些安排的性质与数值计算结果在剪切变形下的非布朗粒子模型的研究。在实验系统中，我们也观察到图像中的裂纹尖端，并确认这些裂纹在垂直于初始振动的方向上沿着间隙生长。
In a uniform layer consisting of a mixture of granular material and liquid, it is known that desiccation cracks exhibit various anisotropic patterns that depend on the nature of the shaking that the layer experienced before drying. The existence of this effect implies that information regarding the direction of shaking is retained as a kind of memory in the arrangements of granular particles. In this work we make measurements in paste composed of Lycopodium powder using microfocus x-ray computerized tomography () in order to investigate the three-dimensional arrangements of particles. We find shaking-induced anisotropic arrangements of neighboring particles and density fluctuations forming interstices mainly in the lower part of the layer. We compare the observed properties of these arrangements with numerical results obtained in the study of a model of non-Brownian particles under shear deformation. In the experimental system, we also observe crack tips in theimages and confirm that these cracks grow along interstices in the direction perpendicular to the initial shaking.