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Analysis of the microstructural connectivity and compressive behavior of particle aggregated silica aerogels

Xiong, Weibo and Abdusalamov, Rasul and Itskov, Mikhail and Milow, Barbara and Rege, Ameya Govind (2024) Analysis of the microstructural connectivity and compressive behavior of particle aggregated silica aerogels. Proceedings in Applied Mathematics and Mechanics, e202300224. Wiley. doi: 10.1002/pamm.202300224. ISSN 1617-7061.

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Official URL: https://onlinelibrary.wiley.com/doi/10.1002/pamm.202300224

Abstract

Porous media such as aerogels can exhibit unique properties including low thermal conductivity, low bulk density, and low sound velocity. However, the limited mechanical properties of aerogels restrict their widespread application. This study focuses on understanding the mechanical behavior of aggregated silica aerogels by investigating their microstructural connectivity and densification mechanisms under uniaxial compression. The interparticle connectivity is generated using the diffusion-limited cluster–cluster aggregation (DLCA) algorithm, and the particle connections are modeled by beam elements that account for contact interaction. The mechanical response of representative volume elements (RVEs) is analyzed in both linear and nonlinear regimes while applying periodic boundary conditions. The model is correlated with experimental compression test data to validate the simulation results. With increasing compressive strain, load transitions between multiple backbone paths appear in the network structure. Thus, the simulation model provides insight into the compression process. Moreover, the simulation model enables the examination of the influence of various model parameters and facilitates the evaluation of the power–law relationship between the elasticity modulus and porosity of aerogels

Item URL in elib:https://elib.dlr.de/202190/
Document Type:Article
Title:Analysis of the microstructural connectivity and compressive behavior of particle aggregated silica aerogels
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Xiong, WeiboRWTH Aachen UniversityUNSPECIFIEDUNSPECIFIED
Abdusalamov, RasulRWTH Aachen UniversityUNSPECIFIEDUNSPECIFIED
Itskov, MikhailRWTH Aachen UniversityUNSPECIFIEDUNSPECIFIED
Milow, BarbaraUNSPECIFIEDhttps://orcid.org/0000-0002-6350-7728UNSPECIFIED
Rege, Ameya GovindUNSPECIFIEDhttps://orcid.org/0000-0001-9564-5482UNSPECIFIED
Date:2024
Journal or Publication Title:Proceedings in Applied Mathematics and Mechanics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI:10.1002/pamm.202300224
Page Range:e202300224
Publisher:Wiley
ISSN:1617-7061
Status:Published
Keywords:dlca, aerogel, model
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Road Transport
DLR - Research area:Transport
DLR - Program:V ST Straßenverkehr
DLR - Research theme (Project):V - FFAE - Fahrzeugkonzepte, Fahrzeugstruktur, Antriebsstrang und Energiemanagement
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Rege, Dr. Ameya Govind
Deposited On:25 Jan 2024 09:36
Last Modified:25 Jan 2024 09:36

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