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Publisher DOI: 10.1016/j.polymertesting.2022.107901
Title: Time, temperature and water aging failure envelope of thermoset polymers
Language: English
Authors: Gibhardt, Dennis 
Krauklis, Andrey E. 
Doblies, Audrius 
Gagani, Abedin I. 
Sabalina, Alisa 
Starkova, Olesja 
Fiedler, Bodo  
Keywords: Accelerated testing; Composite; Creep; Strength; Thermo-mechanical behavior
Issue Date: 10-Dec-2022
Publisher: Elsevier Science
Source: Polymer Testing 118: 107901 (2023)
Abstract (english): 
Epoxies and epoxy-based fiber reinforced polymers (FRP) are significantly affected by environmental impacts during their service life. Exposures to water, humidity, temperature and UV radiation are known to substantially influence the (thermo-) mechanical properties and durability of the materials. Design-relevant characteristics like strength, stiffness, or the glass transition temperature change with time. Therefore, expensive test campaigns are often necessary in advance of a structural design. Prediction models based on physical relations or phenomenological observations are typically required to reduce costs and increase reliability. Consequently, a combined methodology for fast prediction of long-term properties and accelerated aging purposes is presented in this work for a common DGEBA-based epoxy. Therefore, master curves are obtained by creep and constant-strain-rate tests under temperature and moisture impact. A combined time–temperature–water superposition and the Larson–Miller parametrization demonstrate that time-saving CSR tests and modeling can replace long-lasting creep testing. Resulting, the presented methodology allows to determine a polymer's entire (environmental) failure envelope in a relatively short time and with low testing effort.
DOI: 10.15480/882.4973
ISSN: 0142-9418
Journal: Polymer testing 
Institute: Kunststoffe und Verbundwerkstoffe M-11 
Document Type: Article
Project: Modelling Toolbox for Predicting Long- Term Performance of Structural Polymer Composites under Synergistic Environmental Ageing Condition 
Funded by: European Regional Development Fund
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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