Visualization and measurement of load transmission in granular assemblies using mechanoluminescent-coated particles
Visualization and measurement of load transmission in granular assemblies using mechanoluminescent-coated particles
复制标题
DOI：
10.1007/s10035-019-0907-5
复制
发表时间：
2019-06
期刊：
影响因子：
2.4
通讯作者：
A. Kondo;D. Takano;E. Kohama;R. Bathurst
中科院分区：
文献类型：
--
作者：
A. Kondo;D. Takano;E. Kohama;R. Bathurst
用机械发光（ML）涂料和环氧树脂的混合物涂覆玻璃珠，以便通过模拟颗粒材料可视化颗粒级力分布。通过SEM观察和x射线CT扫描验证了ML涂层在玻璃微珠上的涂敷均匀。负载试验在单柱涂层玻璃颗粒上进行，以使亮度与通过颗粒和颗粒接触传递的直径力相等。采用轴向加载装置，测定了包覆颗粒弹性加载时的加载（力）速率与亮度的关系。将涂膜玻璃颗粒置于透明平面应变容器中，并对其进行双轴加载，以可视化通过放置在规则填料中的模拟颗粒材料的载荷传输。在加载过程中，负载传递链的各向异性可以通过这种测试安排来检测。由粒子亮度推导出的容器顶部边界处的接触力总和与施加的边界载荷一致。这种新技术有望作为一种替代方法，通过理想的二维颗粒材料组件来可视化和测量负载传输。
Glass beads were coated with a mixture of mechanoluminescent (ML) paint and epoxy resin in order to visualize particle-level force distribution through an analog granular material. SEM observation and X-ray CT scanning was used to verify that the application of the ML coating on the glass beads was uniform. Load tests were conducted on single columns of coated glass particles to equate luminance to diametrical forces transmitted through the particles and particle contacts. The relationship between loading (force) rate during elastic loading of the coated particles and luminance was determined using a column of beads placed in an axial loading device. Coated glass particles were placed in a transparent plane strain container and subjected to biaxial loading to visualize the load transmission through the analog granular material placed in a regular packing. The anisotropy of chains of load transmission during loading was detectable using this test arrangement. The sum of contact forces at the top container boundary deduced from particle luminance is shown to be in agreement with applied boundary loads. This novel technique holds promise as an alternative approach to visualize and measure load transmission through idealized 2D assemblies of granular material.