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Micromechanical analysis of inclusions in particulate media using digital photo stress analysis tomography

机译：使用数字光应力分析层析成像的微粒介质中夹杂物的微机械分析

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摘要

An experimental study aimed at sensing the stress distribution characteristics of inclusions inside particulate assemblies subjected to axial compaction is presented. The particulate assemblies are made of powders and grains, in which photoelastic inclusions are embedded along the central axis of the assemblies at different elevations. Digital photo stress analysis tomography is used to obtain the contours of maximum shear-stress distribution and the direction of major principal stress within the inclusions under the external loading. Using this, an analysis is performed for understanding the implications of using Hertz theory based on discrete element modeling for simulating stresses in relatively big inclusions surrounded by particulates. In the case of the inclusions surrounded by the grains, the location at which the peak value in maximum shear stresses occurs within the inclusions deviates from that of Hertzian analysis. This effect is dominant in the case of inclusions residing close to the loading surface. Unlike granular materials, shear-stress distribution characteristics of inclusions in powder surroundings tend to display continuum-like behavior under external compression and points to the need for a deeper understanding of the effects of the surrounding materials in particulate beds with inclusions.
机译：提出了旨在检测​​颗粒组件内部夹杂物的应力分布特性的实验研究，这些颗粒组件受到轴向压紧。微粒组件由粉末和颗粒制成，其中光弹性夹杂物沿组件的中心轴嵌入不同高度。使用数字光应力分析层析成像技术来获得最大剪切应力分布的轮廓和外部载荷作用下夹杂物内主要主应力的方向。使用此工具进行分析，以了解使用基于离散元素建模的赫兹理论来模拟被颗粒包围的相对较大的夹杂物中的应力的含义。在夹杂物被晶粒包围的情况下，夹杂物中最大剪切应力峰值出现的位置与赫兹分析的位置不同。在夹杂物位于加载表面附近的情况下，这种作用是主要的。与粒状材料不同，粉末周围环境中夹杂物的剪切应力分布特征在外部压缩下趋于表现出连续体状的行为，这表明需要更深入地了解周围环境中具有夹杂物的颗粒床中材料的作用。

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