Influence of hygrothermal aging on the lifetime and mechanical properties of GFRP/Al adhesive joints

IF 3.2 3区材料科学 Q2 ENGINEERING, CHEMICAL

International Journal of Adhesion and Adhesives Pub Date : 2024-10-30 DOI:10.1016/j.ijadhadh.2024.103880

Behnam Shahrezaee , Mohammad Latifi , Tohid Mirzababaie Mostofi

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Abstract

The study aimed to investigate the impact of hygrothermal aging on the degradation of mechanical properties and predict the lifetime of adhesive joints between aluminum alloy (AA6061) and glass fiber-reinforced epoxy (GFRP) composites. The adhesive joints were prepared in a single lap joint (SLJ) configuration and subjected to hygrothermal conditions to induce aging. Immersion tests were conducted at a water temperature of 70 °C with varying aging periods (10, 18, 40, 54, 60, and 75 days) to assess the long-term performance and predict the lifetime of the joints. The tensile and shear strength of the adhesive joints were evaluated using a tensile test. The test was performed at room temperature (RT) with a speed rate of 1.3 mm/min. Among the different methods available for lifetime prediction, a semi-empirical approach was selected to analyze the changes in the mechanical properties of the adhesive joints. A comprehensive comparison was made between aged and unaged specimens. The experimental results revealed a reduction in the ultimate tensile and shear strength of the adhesive bonds over the 75-day aging period. The semi-empirical relationship used for long-term durability prediction of adhesive joint structures indicated a 78 % decrease in ultimate tensile strength for the adhesive joints over a one-year aging period. This highlights the significant influence of hygrothermal aging on the mechanical properties of the investigated adhesive joints. During the aged periods, various failure modes were observed, including adhesive failure, cohesive failure, and structural failure.

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湿热老化对 GFRP/Al 粘合剂接头寿命和机械性能的影响

该研究旨在探讨湿热老化对铝合金（AA6061）和玻璃纤维增强环氧树脂（GFRP）复合材料之间粘接接头机械性能退化的影响，并预测其使用寿命。粘合剂接头采用单搭接接头（SLJ）结构制备，并在湿热条件下诱导老化。在水温为 70 °C 的条件下进行了不同老化期（10、18、40、54、60 和 75 天）的浸入试验，以评估长期性能并预测接缝的使用寿命。粘合剂接头的拉伸和剪切强度通过拉伸试验进行评估。测试在室温（RT）下进行，速度为 1.3 毫米/分钟。在可用于寿命预测的不同方法中，选择了一种半经验方法来分析粘合剂接头机械性能的变化。对老化试样和未老化试样进行了综合比较。实验结果表明，在 75 天的老化期中，粘合剂接头的极限拉伸强度和剪切强度都有所下降。用于预测粘合剂连接结构长期耐久性的半经验关系表明，在一年的老化期中，粘合剂连接的极限拉伸强度降低了 78%。这凸显了湿热老化对所研究粘合剂接头机械性能的重大影响。在老化期间，观察到了各种失效模式，包括粘合失效、内聚失效和结构失效。

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

International Journal of Adhesion and Adhesives 工程技术-材料科学：综合

CiteScore

6.90

自引率

8.80%

发文量

200

审稿时长

8.3 months

期刊介绍： The International Journal of Adhesion and Adhesives draws together the many aspects of the science and technology of adhesive materials, from fundamental research and development work to industrial applications. Subject areas covered include: interfacial interactions, surface chemistry, methods of testing, accumulation of test data on physical and mechanical properties, environmental effects, new adhesive materials, sealants, design of bonded joints, and manufacturing technology.