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  4. Load‐Induced Shear Band Formation in Microscale Epoxy Materials
 
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Load‐Induced Shear Band Formation in Microscale Epoxy Materials

Citation Link: https://doi.org/10.15480/882.15009
Publikationstyp
Journal Article
Date Issued
2025-03-31
Sprache
English
Author(s)
Mittelhaus, Janina  orcid-logo
Kunststoffe und Verbundwerkstoffe M-11  
Konrad, Julian 
Modellierung weicher Materie M-29  
Jacobs, Julius  orcid-logo
Kunststoffe und Verbundwerkstoffe M-11  
Röttger, Phil  
Kunststoffe und Verbundwerkstoffe M-11  
Meißner, Robert  orcid-logo
Modellierung weicher Materie M-29  
Fiedler, Bodo  orcid-logo
Kunststoffe und Verbundwerkstoffe M-11  
TORE-DOI
10.15480/882.15009
TORE-URI
https://hdl.handle.net/11420/55185
Journal
Journal of polymer science  
Volume
63
Issue
10
Start Page
2174
End Page
2186
Citation
Journal of polymer science 63 (10): 2174-2186 (2025)
Publisher DOI
10.1002/pol.20241162
Scopus ID
2-s2.0-105001854749
Publisher
Wiley
Peer Reviewed
true
Thermosetting polymer thin films exhibit distinct mechanical behaviors at the microscopic scale compared to bulk materials. Experimental results reveal significant necking and unexpected shear band formation under tensile load. This study investigates the mechanisms underlying shear band formation in epoxy resin systems composed of bisphenol‐diglycidyl‐ether and diamines. Mechanical testing methods, including creep, relaxation, and cyclic testing, as well as ex situ and in situ high‐resolution infrared (IR) spectroscopy, are used synergistically with quantum mechanical calculations to elucidate the underlying molecular mechanisms. Additionally, molecular dynamics (MD) simulations on a nanoscale model explored the (visco‐)plastic behavior and network strain in epoxies. Our findings reveal a strong correlation between shear band formation and shifts in IR spectra, specifically the redshift of para‐phenylene and the blueshift of out‐of‐plane vibrations of aromatic moieties. These shifts are attributed to load‐induced aromatic stretching in the polymer backbone. The robust agreement between experimental data and simulation results supports these observations at both the atomic and nanoscale. These insights enhance the understanding of epoxy resin mechanics, potentially informing the design of advanced composite materials.
DDC Class
620.1: Engineering Mechanics and Materials Science
540: Chemistry
530: Physics
Funding(s)
Projekt DEAL  
Publication version
publishedVersion
Lizenz
https://creativecommons.org/licenses/by/4.0/
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