Effect of long-term stress aging on aluminum-BFRP hybrid adhesive joint's mechanical performance: Static and dynamic loading scenarios,Polymer Composites

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Effect of long-term stress aging on aluminum-BFRP hybrid adhesive joint's mechanical performance: Static and dynamic loading scenarios
Polymer Composites ( IF 4.8 ) Pub Date : 2022-06-25 , DOI: 10.1002/pc.26828
Hasan Ulus _{1,

2} , Halil Burak Kaybal ₃ , Fatih Cacık ₄ , Volkan Eskizeybek ₅ , Ahmet Avcı ₄

Affiliation

Composite-aluminum hybrid adhesive joints represent an ideal solution for designing lightweight structures for the marine industry. However, seawater aging is a serious concern, limiting the safe service life of the joint. Notably, efforts to understand the impact of aging have largely focused on the short-term periods without considering actual operating conditions. Here, we report the mechanical performance of hybrid joints subjected to the long-term stress aging. Besides, we modified the epoxy adhesive with halloysite nanotubes (HNTs) to limit the aging driven adhesive degradation and improve the adhesive's rigidity. We evaluated mechanical performances of hybrid joints by performing tensile, flexural, and drop-weight impact tests. While we increased the load-carrying capacity by over 25% with the HNTs modification before the stress aging process, modified adhesive withstood almost 55% higher tensile load than the neat epoxy adhesive after six-month stress aging. The modified adhesive also absorbed 41% less impact energy, indicating the efficiency of HNTs on limiting the degradation due to the stress aging. Furthermore, the damage mode transformed from adhesion to cohesion, thanks to the improved adhesive-composite interface performance. We envisage that these exciting results will pave the way for designing robust hybrid joints for the marine industry.

中文翻译：

长期应力老化对铝-BFRP混合胶接头力学性能的影响：静态和动态加载场景

复合铝混合粘合剂接头代表了为海洋工业设计轻质结构的理想解决方案。然而，海水老化是一个严重的问题，限制了接头的安全使用寿命。值得注意的是，了解老化影响的努力主要集中在短期内，而没有考虑实际运营条件。在这里，我们报告了经受长期应力老化的混合接头的机械性能。此外，我们用埃洛石纳米管 (HNT) 对环氧树脂粘合剂进行了改性，以限制老化驱动的粘合剂降解并提高粘合剂的刚性。我们通过进行拉伸、弯曲和落锤冲击测试来评估混合接头的机械性能。虽然我们在应力老化过程之前通过 HNT 改性将承载能力提高了 25% 以上，但在六个月的应力老化后，改性粘合剂比纯环氧树脂粘合剂承受了近 55% 的拉伸载荷。改性粘合剂还减少了 41% 的冲击能量，表明 HNT 在限制由于应力老化引起的降解方面的效率。此外，由于粘合剂-复合材料界面性能的提高，损伤模式从粘附转变为内聚。我们设想，这些令人兴奋的结果将为为海洋工业设计坚固的混合接头铺平道路。表明 HNT 在限制应力老化引起的降解方面的效率。此外，由于粘合剂-复合材料界面性能的提高，损伤模式从粘附转变为内聚。我们设想，这些令人兴奋的结果将为为海洋工业设计坚固的混合接头铺平道路。表明 HNT 在限制应力老化引起的降解方面的效率。此外，由于粘合剂-复合材料界面性能的提高，损伤模式从粘附转变为内聚。我们设想，这些令人兴奋的结果将为为海洋工业设计坚固的混合接头铺平道路。

更新日期：2022-06-25

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