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

Aney, Shivangi and Schettler, Jessica and Schwan, Marina and Milow, Barbara and Rege, Ameya Govind (2022) Insights into the Micromechanics of Organic Aerogels Based on Experimental and Modeling Results. Advanced Engineering Materials, 24 (1), p. 2100095. Wiley. doi: 10.1002/adem.202100095. ISSN 1438-1656.

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Official URL: https://onlinelibrary.wiley.com/doi/10.1002/adem.202100095

Abstract

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.

Item URL in elib:https://elib.dlr.de/142208/
Document Type:Article
Title:Insights into the Micromechanics of Organic Aerogels Based on Experimental and Modeling Results
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Aney, ShivangiUNSPECIFIEDUNSPECIFIED
Schettler, JessicaUNSPECIFIEDUNSPECIFIED
Schwan, MarinaUNSPECIFIEDUNSPECIFIED
Milow, BarbaraUNSPECIFIEDhttps://orcid.org/0000-0002-6350-7728
Rege, Ameya GovindUNSPECIFIEDhttps://orcid.org/0000-0001-9564-5482
Date:2022
Journal or Publication Title:Advanced Engineering Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:24
DOI:10.1002/adem.202100095
Page Range:p. 2100095
Publisher:Wiley
ISSN:1438-1656
Status:Published
Keywords:aerogel; organic; constitutive modeling
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Energie und Verkehr
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Rege, Dr. Ameya Govind
Deposited On:17 May 2021 08:06
Last Modified:24 May 2022 23:47

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