On the validity of representation of the inter-particle forces of a polymer-colloid cluster by linear springs

Dargazany, Roozbeh; Chen, Hsieh; Lin, Jiaqi; Azad, Ali Imani; Alexander‐Katz, Alfredo

doi:10.1016/j.polymer.2016.11.052

Cited by 5 publications

(6 citation statements)

References 65 publications

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“…These arrays of particles then form the pore walls. Dargazany et al [ 23 ] investigated the validity of representing interparticle bonds by means of linear springs. They found that under relatively small deformations and for moderately connected bonds, this assumption remains valid.…”

Section: Methodsmentioning

confidence: 99%

Insights into the Micromechanics of Organic Aerogels Based on Experimental and Modeling Results

et al. 2021

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While the characteristics of the macroscopic mechanical behavior of organic aerogels are well known, the mechanisms responsible for the substructural evolution of their networks under mechanical deformation are not fully understood. Herein, organic aerogels from the aqueous sol−gel polymerization of resorcinol with formaldehyde are first prepared. Specifically, the resorcinol to water (R:W) molar ratio is varied for obtaining diverse highly open‐cellular porous structures with mean pore sizes ranging between 30 and 50 nm. The corresponding network structures are then characterized and exhibit different morphological and mechanical properties. Furthermore, a micromechanical constitutive model based on the pore‐wall kinematics is proposed. While the arrays of particles forming the pore walls are moderately connected, the pore walls are considered to behave as solid beams under mechanical deformation. Moreover, the damage mechanisms in the pore walls that result in the network collapse are defined. All model parameters are shown to be physically derived, and their sensitivity to the macroscopic network behavior is analyzed. The model predictions are shown to be in good agreement with the experimental stress−strain data of the different aerogels.

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Section: Methodsmentioning

confidence: 99%

Insights into the Micromechanics of Organic Aerogels Based on Experimental and Modeling Results

et al. 2021

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“…However, in some materials the error associated to ILS is found to be sufficiently low so it can be adopted [4,5,28,[62][63][64][65][66][67]. Our recent studies show that the ILS assumption is relevant only in certain binary composites and the error associated to it varies based on the aggregation process [42,68]. While an analysis of the ILS assumption is out of the scope of this paper, our results suggest that the ILS assumption is relevant for close-packed clusters and thus can be used here.…”

Section: B Strain Energymentioning

confidence: 77%

“…Special attention has been given to the model with the ability to describe different shapes the clots formed by the shear flow of the media. In our recent studies [42,68], the microscopic structure, connectivity, and bond stiffness have also been validated by comparing the assembled clusters against the results of experimentally confocal microscopy tests performed by Dinsmore et al on PC clusters [1,2]. Moreover, the effective spring constants as of the interparticle bonds can be determined as functions of deformation by measuring the thermal fluctuations of particles in assembled clusters.…”

Section: A Simulation Of Clusters By Brownian Dynamicsmentioning

confidence: 84%

“…In the next step, the bonds will be categorized based on their connectivity index. Our recent study shows that the bonds with similar connectivity index behave similar whether they are in the backbone chain or not [42]. Interparticle bonds control thermal motions of the particles.…”

Section: B Benchmarking Of the Model Predictionsmentioning

confidence: 94%

“…This study mainly focuses on polymer-colloid clusters in which the stress path formation occurs. The process of formation of the backbone chain and its contribution to the mechanics of clusters in different types of aggregation fall has been addressed in a separate study [42].…”

Section: Introductionmentioning

confidence: 99%

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Micromechanical model for isolated polymer-colloid clusters under tension

et al. 2016

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Binary polymer-colloid (PC) composites form the majority of biological load-bearing materials. Due to the abundance of the polymer and particles, and their simple aggregation process, PC clusters are used broadly by nature to create biomaterials with a variety of functions. However, our understanding of the mechanical features of the clusters and their load transfer mechanism is limited. Our main focus in this paper is the elastic behavior of close-packed PC clusters formed in the presence of polymer linkers. Therefore, a micromechanical model is proposed to predict the constitutive behavior of isolated polymer-colloid clusters under tension. The mechanical response of a cluster is considered to be governed by a backbone chain, which is the stress path that transfers most of the applied load. The developed model can reproduce the mean behavior of the clusters and is not dependent on their local geometry. The model utilizes four geometrical parameters for defining six shape descriptor functions which can affect the geometrical change of the clusters in the course of deformation. The predictions of the model are benchmarked against an extensive set of simulations by coarse-grained-Brownian dynamics, where clusters with different shapes and sizes were considered. The model exhibits good agreement with these simulations, which, besides its relative simplicity, makes the model an excellent add-on module for implementation into multiscale models of nanocomposites.

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A micro-mechanical approach to model thermal induced aging in elastomers

Mohammadi

Dargazany

2019

International Journal of Plasticity

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On the validity of representation of the inter-particle forces of a polymer-colloid cluster by linear springs

Cited by 5 publications

References 65 publications

Insights into the Micromechanics of Organic Aerogels Based on Experimental and Modeling Results

Insights into the Micromechanics of Organic Aerogels Based on Experimental and Modeling Results

Micromechanical model for isolated polymer-colloid clusters under tension

A micro-mechanical approach to model thermal induced aging in elastomers

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