Influence of artificial UV degradation on the performance of steel/GFRP single-lap joints during exposure time

IF 2.9 4区材料科学 Q2 ENGINEERING, CHEMICAL

Journal of Adhesion Pub Date : 2023-01-26 DOI:10.1080/00218464.2023.2168536

Hiasmim Rohem Gualberto, João Marciano Laredo Dos Reis, Mônica Calixto de Andrade, H. Costa, Felipe do Carmo Amorim

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引用次数: 3

Abstract

ABSTRACT Metal structures can be repaired with composites using adhesives. However, because it involves polymeric materials, the environmental conditions of the structure can modify the behavior of the material, making its use unfeasible. Ultraviolet radiation (UV) is a degradation agent that has strong action on the polymeric materials, which are present in the adhesives and matrix of composites. In this work, it is studied the behavior of steel/GFRP single-lap joints using epoxy adhesive when exposed to UV radiation for different time intervals, to understand their behavior. The joint behavior was evaluated by shear testing and the adhesive was analyzed by DMA, FTIR and TGA. A decline of up to 32.5% in shear strength was observed with increasing UV exposure time. The Tg of the adhesive also showed a reduction. The FTIR spectra of the adhesive indicated a reduction in peaks related to epoxy functional groups when the exposure time was increased. This revealed degradation of the polymeric chains of the adhesive, a fact that can be associated with the reduction in Tg and the reduction in the shear strength of the joint. Thus, the application of such material in places exposed to UV radiation should consider the poorer performance regarding degradation.

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暴露时间内人工紫外线降解对钢/GRP单搭接接头性能的影响

摘要金属结构可以通过使用粘合剂的复合材料进行修复。然而，由于它涉及聚合物材料，结构的环境条件会改变材料的行为，使其使用变得不可行。紫外线（UV）是一种对聚合物材料具有强烈作用的降解剂，聚合物材料存在于复合材料的粘合剂和基体中。在这项工作中，研究了使用环氧粘合剂的钢/GRP单搭接接头在不同时间间隔暴露于紫外线辐射时的行为，以了解它们的行为。通过剪切试验评价了胶接性能，并通过DMA、FTIR和TGA对胶接性能进行了分析。随着UV暴露时间的增加，观察到剪切强度下降高达32.5%。粘合剂的Tg也显示出降低。粘合剂的FTIR光谱表明，当暴露时间增加时，与环氧官能团相关的峰减少。这揭示了粘合剂的聚合物链的降解，这一事实可能与Tg的降低和接头的剪切强度的降低有关。因此，在暴露于紫外线辐射的地方应用此类材料应考虑降解性能较差的问题。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Adhesion 工程技术-材料科学：综合

CiteScore

5.30

自引率

9.10%

发文量

审稿时长

1 months

期刊介绍： The Journal of Adhesion is dedicated to perpetuating understanding of the phenomenon of adhesion and its practical applications. The art of adhesion is maturing into a science that requires a broad, coordinated interdisciplinary effort to help illuminate its complex nature and numerous manifestations.