Evaluation of Joint Formation and Mechanical Performance of the AA7075-T6/CFRP Spot Joints Produced by Frictional Heat
Evaluation of Joint Formation and Mechanical Performance of the AA7075-T6/CFRP Spot Joints Produced by Frictional Heat
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DOI：
10.3390/ma12060891
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发表时间：
2019-03-17
期刊：
影响因子：
3.4
通讯作者：
Amancio-Filho, Sergio T.
中科院分区：
文献类型：
--
作者：
Andre, Natalia Manente;dos Santos, Jorge F.;Amancio-Filho, Sergio T.
轻质混合金属-聚合物结构的发展最近引起了运输行业的兴趣。然而，将金属和聚合物或复合材料连接起来的可能性仍然是一个巨大的挑战。摩擦点连接（FSpJ）是一种屡获殊荣的金属-聚合物混合结构摩擦连接技术。该技术是环保的，包括非常短的连接周期（2至8秒）。在目前的工作中，铝合金7075-T6和碳纤维增强聚苯硫醚（CF-PPS）摩擦点接头的生产和评估的第一次在文献中。研究了点焊接头的微观组织、准静态力学性能和失效机理。宏观和微观机械互锁被确定为主要的粘结机制，沿着由于重新固结的聚合物层的粘合力。此外，还讨论了连接力对接头力学性能的影响。在本研究中达到了高达4068 +/- 184 N的极限搭接剪切力。确定了粘合剂-内聚破坏的混合模式，而内聚破坏占主导地位。最后，定性比较与其他国家的最先进的连接技术的混合结构表明，摩擦点接头最终表现出上级/类似的强度比/到目前的技术和更短的连接时间。
The development of lightweight hybrid metal-polymer structures has recently attracted interest from the transportation industry. Nevertheless, the possibility of joining metals and polymers or composites is still a great challenge. Friction Spot Joining (FSpJ) is a prize-winning friction-based joining technique for metal-polymer hybrid structures. The technology is environment-friendly and comprises very short joining cycles (2 to 8 s). In the current work, aluminum alloy 7075-T6 and carbon-fiber-reinforced polyphenylene sulfide (CF-PPS) friction spot joints were produced and evaluated for the first time in the literature. The spot joints were investigated in terms of microstructure, mechanical performance under quasi-static loading and failure mechanisms. Macro- and micro-mechanical interlocking were identified as the main bonding mechanism, along with adhesion forces as a result of the reconsolidated polymer layer. Moreover, the influence of the joining force on the mechanical performance of the joints was addressed. Ultimate lap shear forces up to 4068 +/- 184 N were achieved in this study. A mixture of adhesive-cohesive failure mode was identified, while cohesive failure was dominant. Finally, a qualitative comparison with other state-of-the-art joining technologies for hybrid structures demonstrated that the friction spot joints eventually exhibit superior/similar strength than/to concurrent technologies and shorter joining times.