Discrete element model for ZrB2-SiC ceramic composite sintering

Iacobellis, Vincent; Radhi, Ali; Behdinan, Kamran

doi:10.1016/j.compstruct.2019.111373

Cited by 16 publications

(3 citation statements)

References 71 publications

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“…Thanks to this enhancement of the particles contact model, it became possible to study sintering and postsintering residual stresses of parti-cles collections [33]. Due to its elegance and efficiency, the approach of Nosewicz et al got a lot of attention among the researchers: For instance, Iacobellis et al [34] used it to model sintering of ceramic composite materials (ZrB 2 -SiC), Matsuda [35] enhanced it with independent evaluation of the neck growth rate between two particles by means of the direct integration of the diffusion equation.…”

Section: Introductionmentioning

confidence: 99%

Coupling the discrete element method and solid state diffusion equations for modeling of metallic powders sintering

et al. 2022

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A novel discrete element method-based approach for modeling of solid state sintering of spherical metallic powder is presented. It tackles the interplay between the thermodynamical mass transport effects arising in the vicinity of the grain boundary between the particles and their mechanical interaction. To deal with the former, an elementary model is used that describes the behavior of the matter flow at the grain boundary such that neck growth and shrinkage are properly captured. The model solves a set of partial differential equations which drive the changes of the corresponding geometry parameters. Their evolution is transformed into the equivalent normal sintering force arising in each sinter neck. To capture the mechanical interaction of particles due to their rearrangement resulting from the geometry changes of each individual contact, the entire assembly is modeled as an assembly of 2-nodal structural elements with 6 degrees of freedom per node. The stiffness properties are estimated employing the approximations from the bonded DEM. The numerical implementation then constitutes a two-step staggered solution scheme, where these models are applied sequentially. The performed benchmarks reveal the plausibility of the proposed approach and exhibit good agreement of both neck growth and shrinkage rates obtained in the numerical simulations with the experimental data.

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Section: Introductionmentioning

confidence: 99%

Coupling the discrete element method and solid state diffusion equations for modeling of metallic powders sintering

et al. 2022

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“…The DEM is the only currently available technique that can provide insight at the particle level and has been used in a wide variety of applications, such as ceramics [11], pharmaceutical, and food industries [12,13]. Given that the DEM is an excellent tool for studying these applications, modeling of confined powder compression with DEM remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

Modeling of High-Density Compaction of Pharmaceutical Tablets Using Multi-Contact Discrete Element Method

et al. 2021

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The purpose of this work is to simulate the powder compaction of pharmaceutical materials at the microscopic scale in order to better understand the interplay of mechanical forces between particles, and to predict their compression profiles by controlling the microstructure. For this task, the new framework of multi-contact discrete element method (MC-DEM) was applied. In contrast to the conventional discrete element method (DEM), MC-DEM interactions between multiple contacts on the same particle are now explicitly taken into account. A new adhesive elastic-plastic multi-contact model invoking neighboring contact interaction was introduced and implemented. The uniaxial compaction of two microcrystalline cellulose grades (Avicel® PH 200 (FMC BioPolymer, Philadelphia, PA, USA) and Pharmacel® 102 (DFE Pharma, Nörten-Hardenberg, Germany) subjected to high confining conditions was studied. The objectives of these simulations were: (1) to investigate the micromechanical behavior; (2) to predict the macroscopic behavior; and (3) to develop a methodology for the calibration of the model parameters needed for the MC-DEM simulations. A two-stage calibration strategy was followed: first, the model parameters were directly measured at the micro-scale (particle level) and second, a meso-scale calibration was established between MC-DEM parameters and compression profiles of the pharmaceutical powders. The new MC-DEM framework could capture the main compressibility characteristics of pharmaceutical materials and could successfully provide predictions on compression profiles at high relative densities.

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“…Recently, special DEM models are developed for powder metallurgy processes [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. Most of the DEM applications for powder metallurgy have considered one-phase powder; there are very few works dealing with two-phase powders [ 36 , 37 , 38 , 39 ].…”

Section: Introductionmentioning

confidence: 99%

Discrete Element Framework for Determination of Sintering and Postsintering Residual Stresses of Particle Reinforced Composites

2020

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In this paper, the discrete element method framework is employed to determine and analyze the stresses induced during and after the powder metallurgy process of particle-reinforced composite. Applied mechanical loading and the differences in the thermal expansion coefficients of metal/intermetallic matrix and ceramic reinforcing particles during cooling produce the complex state of stresses in and between the particles, leading to the occurrence of material defects, such as cracks, and in consequence the composite degradation. Therefore, the viscoelastic model of pressure-assisted sintering of a two-phase powder mixture is applied in order to study the stress field of particle assembly of intermetallic-ceramic composite NiAl/Al2O3. The stress evaluation is performed at two levels: macroscopic and microscopic. Macroscopic averaged stress is determined using the homogenization method using the representative volume element. Microscopic stresses are calculated both in the body of particles and in the contact interface (necks) between particles. Obtained results are in line with the cooling mechanism of the two-phase materials.

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Discrete element model for ZrB2-SiC ceramic composite sintering

Cited by 16 publications

References 71 publications

Coupling the discrete element method and solid state diffusion equations for modeling of metallic powders sintering

Coupling the discrete element method and solid state diffusion equations for modeling of metallic powders sintering

Modeling of High-Density Compaction of Pharmaceutical Tablets Using Multi-Contact Discrete Element Method

Discrete Element Framework for Determination of Sintering and Postsintering Residual Stresses of Particle Reinforced Composites

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