Effect of interfacial nanostructure on mode mixity in directly bonded carbon fiber reinforced thermoplastic laminates and aluminum alloy considering thermal residual stress
Effect of interfacial nanostructure on mode mixity in directly bonded carbon fiber reinforced thermoplastic laminates and aluminum alloy considering thermal residual stress
复制标题
DOI：
10.1299/jamdsm.2021jamdsm0051
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
H. Ota;Kristine Munk Jespersen;Kei Saito;Keitaro Wada;A. Hosoi;H. Kawada
中科院分区：
文献类型：
--
作者：
H. Ota;Kristine Munk Jespersen;Kei Saito;Keitaro Wada;A. Hosoi;H. Kawada
近年来，为了实现运输设备的减重目标，具有高可回收性和成型性的碳纤维增强热塑性塑料（CFRTP）正变得适合大规模生产。此外，随着多材料结构的发展，金属与CFRTP的连接需要优秀的技术。目前，粘接和机械连接方法被用于连接不同材料，然而，这些方法仍然存在一些问题。因此，对于CFRTP和金属的连接，需要一种不使用胶粘剂或不采用机械连接的替代连接方法。本研究通过在铝合金表面制备纳米结构，专注于CFRTP层压板与铝合金之间的直接连接。纳米结构穿透CFRTP基体，产生锚固效应，显著提高了连接强度。通过静态双悬臂梁试验评估了纳米结构对直接连接的CFRTP和铝的能量释放率的影响。由于CFRTP层压板和铝合金的热膨胀系数不同，会产生显著的残余应力。确定了热残余应力对能量释放率以及由此产生的模式混合（模式I和模式II）的影响。结果表明，纳米结构提高了临界能量释放率，并且在纳米结构的情况下，能量释放率的模式I贡献增加。
In recent years, for the aim of weight reduction of transportation equipment, carbon fiber reinforced thermoplastics (CFRTPs), which have high recyclability and formability, are becoming suitable for mass production. Additionally, with the development of multi-material structures, excellent technologies are required for joining metals and CFRTPs. Presently, adhesive bonding and mechanical joining methods are employed for joining dissimilar materials, however, these methods still have some problems. Therefore, an alternative bonding method that does not use adhesives or employ mechanical joining is required for joining CFRTPs and metals. This study focuses on direct bonding between the CFRTP laminate and an aluminum alloy by fabricating a nanostructure on the aluminum alloy surface. The nanostructure penetrates the CFRTP matrix, causing an anchoring effect that improves the bonding strength significantly. The influence of the nanostructure on the energy release rate of the directly bonded CFRTP and aluminum was evaluated by static double cantilever beam testing. Because of the difference in thermal expansion coefficients of the CFRTP laminate and the aluminum alloy, significant residual stresses are generated. The effect of the thermal residual stresses on the energy release rate along with the resulting mode mixity (mode I and II) was determined. Results reveal that the critical energy release rate is improved by the nanostructure and mode I contribution of the energy release rate is increased for the nanostructure case.