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Correlation between microstructural and macroscopic mechanical properties of polyurethane foams

Greß, Alexander and Griem, Lars and Feser, Thomas and Altschuh, Patrick and Koeppe, Arnd and Beeh, Elmar and Siefkes, Tjark and Nestler, Britta (2022) Correlation between microstructural and macroscopic mechanical properties of polyurethane foams. 7th International Conference on Cellular Materials, 12.-14.10.2022, Dresden.

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Abstract

Mechanical properties of structural foams are largely influenced by the manufacturing process. Depending on the manufacturing process, the foam type (e.g. open-pored/closed-pored), density and the foam orientation are defined. However, these quantities only define the global structural properties. Due to the inhomogeneous process, no adequate statement can yet be made about the real microstructure. However, if a mechanical load is applied, the generated inhomogeneous stress field depends on the actual microstructure, which is characterized by specific values such as pore distribution, mean pore size, spatial gradients in the pore size distribution, pore arrangement and geometry of cell walls. This can lead to local differences in mechanical properties due to irregularities generated by the foaming process. The objective of the current research is linking the above-mentioned microstructural properties and the resulting macroscopic mechanical material behavior of structural foams by using artificial intelligence (AI) based digital methods. Therefore, polyurethane (PU)-foams of varying densities are analyzed to create a suitable database. For each of the investigated foam densities, the dependency of the microstructure and the mechanical properties according to the sampling position are investigated. First, the mechanical properties of tension and compression load are experimentally determined in parallel and perpendicular spatial direction as well as for varying positions along the foaming directions. The microstructure properties of the real PU-foams are determined using computer tomography scans. Afterwards, the microstructures are reconstructed using computer algorithms developed with the microstructure simulation package Pace3D in order to generate digital twins. Applying various data science methods and micromechanics simulations, the morphological characteristics and the mechanical properties of the digital microstructures are determined. The results from experiments and computational methods are compared and correlations between the mechanical tests and the microstructure analyses are derived. In forthcoming research, this correlation of microstructure and mechanical behavior will be explained and predicted using AI-based methods.

Item URL in elib:https://elib.dlr.de/189476/
Document Type:Conference or Workshop Item (Speech)
Title:Correlation between microstructural and macroscopic mechanical properties of polyurethane foams
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Greß, AlexanderAlexander.Gress (at) dlr.deUNSPECIFIED
Griem, LarsKarlsruhe Institute of Technology (KIT)UNSPECIFIED
Feser, ThomasThomas.Feser (at) dlr.dehttps://orcid.org/0000-0003-4741-5361
Altschuh, PatrickUniversity of Applied Sciences Karlsruhe - Institute of Digital Materials ScienceUNSPECIFIED
Koeppe, ArndKarlsruhe Institute of Technology (KIT)UNSPECIFIED
Beeh, ElmarElmar.Beeh (at) dlr.deUNSPECIFIED
Siefkes, TjarkTjark.Siefkes (at) dlr.deUNSPECIFIED
Nestler, BrittaInstitute for Applied Materials - Computational Materials Science (IAM-CMS), Karlsruhe Institute of Technology (KIT), KarlsruheUNSPECIFIED
Date:October 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:mechanical properties, machine learning, structure-property-linkage, foam, polyurethan, microstructure
Event Title:7th International Conference on Cellular Materials
Event Location:Dresden
Event Type:international Conference
Event Dates:12.-14.10.2022
Organizer:DGM - Deutsche Gesellschaft für Materialkunde e.V.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:other
DLR - Research area:Transport
DLR - Program:V - no assignment
DLR - Research theme (Project):V - no assignment
Location: Stuttgart
Institutes and Institutions:Institute of Vehicle Concepts > Material and Process Applications for Road and Rail Vehicles
Deposited By: Greß, Alexander
Deposited On:09 Nov 2022 15:42
Last Modified:09 Nov 2022 15:42

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