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Effect of Service Temperature on Mechanical Properties of Adhesive Joints after Hygrothermal Aging

Polyurethane adhesive and aluminum alloy were selected to make adhesive joints. Butt joints tested at different loading angles (0°, 45°, and 90°) using a modified Arcan fixture were selected to represent three stress states (normal stress, normal/shear combined stress, and shear stress, respectively...

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Detalles Bibliográficos
Autores principales: Tan, Wei, Na, Jingxin, Zhou, Zhaofeng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8587949/
https://www.ncbi.nlm.nih.gov/pubmed/34771300
http://dx.doi.org/10.3390/polym13213741
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author Tan, Wei
Na, Jingxin
Zhou, Zhaofeng
author_facet Tan, Wei
Na, Jingxin
Zhou, Zhaofeng
author_sort Tan, Wei
collection PubMed
description Polyurethane adhesive and aluminum alloy were selected to make adhesive joints. Butt joints tested at different loading angles (0°, 45°, and 90°) using a modified Arcan fixture were selected to represent three stress states (normal stress, normal/shear combined stress, and shear stress, respectively). Firstly, the accelerated aging tests were carried out on the joints in a hygrothermal environment (80 °C/95% RH). The quasi-static tests were carried out at different temperatures (−40 °C, 20 °C, and 80 °C) for the joints after hygrothermal aging for different periods. The variation rules of the joints’ mechanical properties and failure modes with different aging levels were studied. The results show that the failure load of the joints was obviously affected by stress state and temperature. In the low-temperature test, the failure load of the joints decreased most obviously, and the BJ was the most sensitive to temperature, indicating that the failure load decreased more with the increase of the normal stress ratio in the joint. Through macroscopic and SEM analysis of the failure section, it was found that the hydrolysis reaction of polyurethane adhesive itself and the interface failure of the joints were the main reasons for the decrease of joint strength. The failure models were established to characterize the adhesive structure with different aging levels at service temperature.
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spelling pubmed-85879492021-11-13 Effect of Service Temperature on Mechanical Properties of Adhesive Joints after Hygrothermal Aging Tan, Wei Na, Jingxin Zhou, Zhaofeng Polymers (Basel) Article Polyurethane adhesive and aluminum alloy were selected to make adhesive joints. Butt joints tested at different loading angles (0°, 45°, and 90°) using a modified Arcan fixture were selected to represent three stress states (normal stress, normal/shear combined stress, and shear stress, respectively). Firstly, the accelerated aging tests were carried out on the joints in a hygrothermal environment (80 °C/95% RH). The quasi-static tests were carried out at different temperatures (−40 °C, 20 °C, and 80 °C) for the joints after hygrothermal aging for different periods. The variation rules of the joints’ mechanical properties and failure modes with different aging levels were studied. The results show that the failure load of the joints was obviously affected by stress state and temperature. In the low-temperature test, the failure load of the joints decreased most obviously, and the BJ was the most sensitive to temperature, indicating that the failure load decreased more with the increase of the normal stress ratio in the joint. Through macroscopic and SEM analysis of the failure section, it was found that the hydrolysis reaction of polyurethane adhesive itself and the interface failure of the joints were the main reasons for the decrease of joint strength. The failure models were established to characterize the adhesive structure with different aging levels at service temperature. MDPI 2021-10-29 /pmc/articles/PMC8587949/ /pubmed/34771300 http://dx.doi.org/10.3390/polym13213741 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Tan, Wei
Na, Jingxin
Zhou, Zhaofeng
Effect of Service Temperature on Mechanical Properties of Adhesive Joints after Hygrothermal Aging
title Effect of Service Temperature on Mechanical Properties of Adhesive Joints after Hygrothermal Aging
title_full Effect of Service Temperature on Mechanical Properties of Adhesive Joints after Hygrothermal Aging
title_fullStr Effect of Service Temperature on Mechanical Properties of Adhesive Joints after Hygrothermal Aging
title_full_unstemmed Effect of Service Temperature on Mechanical Properties of Adhesive Joints after Hygrothermal Aging
title_short Effect of Service Temperature on Mechanical Properties of Adhesive Joints after Hygrothermal Aging
title_sort effect of service temperature on mechanical properties of adhesive joints after hygrothermal aging
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8587949/
https://www.ncbi.nlm.nih.gov/pubmed/34771300
http://dx.doi.org/10.3390/polym13213741
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