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Constitutive Modeling of the Densification Behavior in Open-Porous Cellular Solids

Rege, Ameya Govind (2021) Constitutive Modeling of the Densification Behavior in Open-Porous Cellular Solids. Materials, 14 (11), p. 2731. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/ma14112731. ISSN 1996-1944.

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Official URL: https://www.mdpi.com/1996-1944/14/11/2731

Abstract

The macroscopic mechanical behavior of open-porous cellular materials is dictated by the geometric and material properties of their microscopic cell walls. The overall compressive response of such materials is divided into three regimes, namely, the linear elastic, plateau and densification. In this paper, a constitutive model is presented, which captures not only the linear elastic regime and the subsequent pore-collapse, but is also shown to be capable of capturing the hardening upon the densification of the network. Here, the network is considered to be made up of idealized square-shaped cells, whose cell walls undergo bending and buckling under compression. Depending on the choice of damage criterion, viz. elastic buckling or irreversible bending, the cell walls collapse. These collapsed cells are then assumed to behave as nonlinear springs, acting as a foundation to the elastic network of active open cells. To this end, the network is decomposed into an active network and a collapsed one. The compressive strain at the onset of densification is then shown to be quantified by the point of intersection of the two network stress-strain curves. A parameter sensitivity analysis is presented to demonstrate the range of different material characteristics that the model is capable of capturing. The proposed constitutive model is further validated against two different types of nanoporous materials and shows good agreement.

Item URL in elib:https://elib.dlr.de/142394/
Document Type:Article
Title:Constitutive Modeling of the Densification Behavior in Open-Porous Cellular Solids
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Rege, Ameya GovindUNSPECIFIEDhttps://orcid.org/0000-0001-9564-5482
Date:21 May 2021
Journal or Publication Title:Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:14
DOI:10.3390/ma14112731
Page Range:p. 2731
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:1996-1944
Status:Published
Keywords:constitutive model; open-porous materials; compression; densification
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 - NGC Fahrzeugstruktur II
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Rege, Dr. Ameya Govind
Deposited On:25 May 2021 07:58
Last Modified:24 May 2022 23:47

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