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Publisher DOI: 10.3390/polym11020363
Title: Prediction of thermal exposure and mechanical behavior of epoxy resin using artificial neural networks and Fourier transform infrared spectroscopy
Language: English
Authors: Doblies, Audrius 
Boll, Benjamin 
Fiedler, Bodo 
Keywords: non-destructive testing;thermal aging;FTIR;artificial neural network;machine learning
Issue Date: 19-Feb-2019
Publisher: Multidisciplinary Digital Publishing Institute
Source: Polymers 11 (2): 363 (2019)
Journal or Series Name: Polymers 
Abstract (english): Thermal degradation detection of cured epoxy resins and composites is currently limited to severe thermal damage in practice. Evaluating the change in mechanical properties after a short-time thermal exposure, as well as estimating the history of thermally degraded polymers, has remained a challenge until now. An approach to accurately predict the mechanical properties, as well as the thermal exposure time and temperature of epoxy resin, using Fourier-transform infrared spectroscopy (FTIR)-spectroscopy, data processing, and artificial neural networks, is presented here. Therefore, an epoxy resin has been fully cured and exposed to elevated temperatures for different time periods. A FTIR-spectrometer was used to measure molecular changes, using mid-IR (MIR)-FTIR for film samples and near-IR (NIR)-FTIR for bulk samples. A quantitative analysis of the thermally degraded film samples shows oxidation, chain-scission, and dehydration in the FTIR spectra in the MIR-range. Using NIR spectroscopy for the bulk samples, only minor changes in the FTIR spectra could be detected. However, using data processing, molecular information was extracted from the NIR range and a degradation model, using an artificial neural network, has been trained. Even though the changes due to thermal exposure were small, the presented model is capable of accurately predicting the time, temperature, and residual strength of the polymer.
DOI: 10.15480/882.2112
ISSN: 2073-4360
Other Identifiers: doi: 10.3390/polym11020363
Institute: Kunststoffe und Verbundwerkstoffe M-11 
Type: (wissenschaftlicher) Artikel
Funded by: Deutsche Forschungsgemeinschaft
Project: Open Access Publizieren 2018 - 2019 / TU Hamburg 
Analyse und Modellierung des Schädigungsverhaltens faserverstärkter Kunststoffe bei zyklischer Beanspruchung mit Lastrichtungsumkehr 
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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