Mechanical strength of wet particle agglomerates

被引:23
作者
Thanh-Trung Vo [1 ,2 ]
Mutabaruka, Patrick [3 ]
Nezamabadi, Saeid [1 ]
Delenne, Jean-Yves [4 ]
Izard, Edouard [5 ]
Pellenq, Roland [3 ]
Radjai, Farhang [1 ,3 ]
机构
[1] Univ Montpellier, CNRS, LMGC, Montpellier, France
[2] Danang Architecture Univ, Bridge & Rd Dept, Da Nang 553000, Vietnam
[3] MIT Energy Initiat, UMI 3466 MIT CNRS, MSE2, 77 Massachusetts Ave, Cambridge, MA 02139 USA
[4] Univ Montpellier SupAgro, CIRAD, INRA UMR1208, IATE, F-34060 Montpellier, France
[5] ArcelorMittal R&D Maizieres, F-57283 Maizieres Ls Metz, France
关键词
Granular matter; Agglomerate; Capillary force law; Discrete element method; Plastic strength; Diametrical compression; GROWTH REGIME MAP; IMPACT BREAKAGE; NUMERICAL-SIMULATION; DRUM GRANULATION; CAPILLARY BRIDGE; BINDER CONTENT; FLUIDIZED-BED; GRANULES; MODEL; BEHAVIOR;
D O I
10.1016/j.mechrescom.2018.07.003
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Using particle dynamics simulations, we investigate the strength and microstructure of agglomerates of wet frictional particles subjected to axial compression. The numerical model accounts for the cohesive and viscous effects of the binding liquid up to a debonding distance with the liquid assumed to be distributed homogeneously inside the agglomerate. We show that wet agglomerates undergo plastic deformation due to the rearrangements of primary particles during compression. The compressive strength is thus characterized by the plastic threshold before the onset of failure by the irreversible loss of wet contacts between primary particles. We find that the agglomerate plastic threshold is proportional to the characteristic cohesive stress defined from the liquid-vapor surface tension and the mean diameter of primary particles, with a prefactor that is a nearly linear function of the debonding distance and increases with size span. We analyze the agglomerate microstructure and, considering only the cohesive capillary forces at all bonds between primary particles, we propose an expression of the plastic strength as a function of the texture parameters such as the wet coordination number and packing fraction. This expression is shown to be consistent with our simulations up to a multiplicative factor reflecting the distribution of the capillary bridges. (C) 2018 Published by Elsevier Ltd.
引用
收藏
页码:1 / 7
页数:7
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