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Microstructural and mechanical characterization of carbon aerogels: An in-situ and digital image correlation-based study

Rege, Ameya Govind and Schwan, Marina and Chernova, Liudmila and Hillgärtner, Markus and Itskov, Mikhail and Milow, Barbara (2019) Microstructural and mechanical characterization of carbon aerogels: An in-situ and digital image correlation-based study. Journal of Non-Crystalline Solids, 529, p. 119568. Elsevier. ISSN 0022-3093

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Abstract

The mechanical behavior of carbon aerogels is not very well understood, presenting a bottle-neck in synthesizing aerogels for specific applications where mechanical loads play a role. Accordingly, in this paper, three different types of carbon aerogels with varying mechanical properties and flexibility are synthesized and analyzed. The morphology is characterized by using a scanning electron microscope (SEM) and nitrogen adsorption-desorption isotherms. The mechanical behavior is investigated under uniaxial quasistatic compression as well as in-situ compression under a SEM. While in-situ tests reveal microstructural evolution under deformation, the macroscopic deformation is described by the digital image correlation. Based on cyclic compression tests with step-wise increasing strain amplitude, novel empirical relations are proposed to describe the damage characteristics such as energy dissipation and residual deformation. Furthermore, while testing carbon aerogels under tension is not very feasible, three-point bending tests are conducted and the resulting flexural properties of carbon aerogels are identified.

Item URL in elib:https://elib.dlr.de/130244/
Document Type:Article
Title:Microstructural and mechanical characterization of carbon aerogels: An in-situ and digital image correlation-based study
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rege, Ameya GovindAmeya.Rege (at) dlr.dehttps://orcid.org/0000-0001-9564-5482
Schwan, Marinamarina.schwan (at) dlr.dehttps://orcid.org/0000-0001-6329-8164
Chernova, LiudmilaLiudmila.Chernova (at) dlr.deUNSPECIFIED
Hillgärtner, MarkusRWTH AachenUNSPECIFIED
Itskov, Mikhailitskov (at) km.rwth-aachen.deUNSPECIFIED
Milow, BarbaraBarbara.Milow (at) dlr.dehttps://orcid.org/0000-0002-6350-7728
Date:October 2019
Journal or Publication Title:Journal of Non-Crystalline Solids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:529
Page Range:p. 119568
Publisher:Elsevier
ISSN:0022-3093
Status:Published
Keywords:carbon aerogels, mechanical behavior, in-situ study, DIC
HGF - Research field:Energy
HGF - Program:Energy Efficiency, Materials and Resources
HGF - Program Themes:Methods and Concepts for Materials Development
DLR - Research area:Energy
DLR - Program:E VS - Combustion Systems
DLR - Research theme (Project):E - Materials for Energy Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Schwan, Marina
Deposited On:03 Jan 2020 11:44
Last Modified:03 Jan 2020 11:44

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