Abstract
Packed structures are an essential part of nuclear reactors, food, chemical, transport, and process industries. Since the safety and quality of products in the packed structures is of high priority, identifying critical failure spots in packed structures is of utmost importance. The present study aims to identify critical spots in the hexagonally packed structures under mechanical loads in the presence of defects. The role of defects in the formation of force networks is also investigated in this work. The granular mechanics approach is used to analyze the analogous force pattern formation in packed structures. Discrete element method (DEM) is used to simulate the particle interaction in the granular assembly. The hexagonal packing, in X-Y plane, is created by stacking the horizontal contacting particle chains in X-direction, and thus creating inclined contact chains in the Y-direction. Hexagonal packings display two stable force network formations corresponding to compression along X and Y-direction. The effect of point defect and stacking fault on the force network is investigated. The presence of point defect is shown to induce high force concentration near the defect zone. When the assembly is compressed along X-direction, force redistribution at the defect zone increases the force levels in inclined force chains. When the assembly is compressed along Y-direction, the point defect induces zones with lesser force levels. Further, the study explores various levels of force zones induced in the system. The effect of the presence of multiple point defects in the system is analyzed further. The distance between two point defects and their loading direction induces a different set of force chains. Stacking fault is found to induce strong vertical force chains at the defect zone, unlike point defect. However, multiple stacking faults affect only the horizontal force chains near the defect zone. The present study highlights the formation of critical spots as well as lower force zones and also provides useful insights to design efficient packing structures.
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Vijayan, A., Banerjee, A. & Desu, R.K. Role of packing defects in force networks of hexagonally packed structures using discrete element method. Granular Matter 24, 23 (2022). https://doi.org/10.1007/s10035-021-01185-4
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DOI: https://doi.org/10.1007/s10035-021-01185-4