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非织造碳布增强环氧树脂粘结层对铝合金接头单搭接粘结强度的影响

Effect of Nonwoven Carbon Tissue-Reinforced Epoxy Resin Adhesive Layer on the Single Lap Bonding Strength of Aluminum Alloy Joints.

作者信息

Hu Zhifeng, Kong Haijuan, Tao Lei, Qiao Mengmeng, Yu Dongzi, Lu Feiyang, Dawelbeit Ahmed, Yu Muhuo

机构信息

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China.

College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.

出版信息

ACS Omega. 2021 Sep 6;6(37):23802-23813. doi: 10.1021/acsomega.1c02635. eCollection 2021 Sep 21.

DOI:10.1021/acsomega.1c02635
PMID:34568660
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8459363/
Abstract

The present paper provides a solution to enhance the reliability of bonding. The effect of the nonwoven carbon tissue (NWCT) composite adhesive layer on the bonding strength and reliability of aluminum alloy of single lap joints (SLJ) was investigated by embedding NWCT into the epoxy adhesive layer. The bonding strength, Weibull distribution, metallography of cross section, and fracture surface morphology of NWCT specimens were investigated. The results showed that the average bonding strength and Weibull characteristic strength (WCS) of NWCT-reinforced specimen were 16.78 and 17.17 MPa, which increased by 70.2 and 66.7%, respectively, compared with the neat specimen, and the Weibull modulus increased from 11.46 to 22.83, which indicated that NWCT specimens had higher bonding reliability. The mechanism of microcrack formation was obtained by analyzing the cross section of specimen loaded 95% WCS without macroscopic damage. The metallographic section showed that the microcrack of the neat specimen originated from the adhesive-aluminum interface, while the microcracks of the NWCT specimen originated from the interface between short carbon fibers (SCF) and adhesive. Typical failure modes were gained from visual observation and SEM. The failure mode of the neat specimen included more Al-adhesive interface failure, while the NWCT specimen included more internal failure of adhesive-SCFs with the fracture, pullout, peeling, and slippage of SCFs improving the toughness and bonding strength of the adhesive layer. The bridging effect of SCFs in the adhesive layer reinforced by NWCT can even the load and release the stress to improve the bonding reliability.

摘要

本文提供了一种提高粘结可靠性的解决方案。通过将非织造碳组织（NWCT）嵌入环氧粘结剂层，研究了NWCT复合粘结剂层对单搭接接头（SLJ）铝合金粘结强度和可靠性的影响。研究了NWCT试样的粘结强度、威布尔分布、横截面金相组织和断口表面形貌。结果表明，NWCT增强试样的平均粘结强度和威布尔特征强度（WCS）分别为16.78和17.17MPa，与纯试样相比分别提高了70.2%和66.7%，威布尔模量从11.46提高到22.83，这表明NWCT试样具有更高的粘结可靠性。通过分析加载95%WCS且无宏观损伤的试样横截面，得到了微裂纹形成的机理。金相截面表明，纯试样的微裂纹起源于粘结剂-铝界面，而NWCT试样的微裂纹起源于短碳纤维（SCF）与粘结剂之间的界面。通过目视观察和扫描电子显微镜获得了典型的失效模式。纯试样的失效模式包括更多的铝-粘结剂界面失效，而NWCT试样包括更多的粘结剂-SCFs内部失效，SCF的断裂、拔出、剥离和滑动提高了粘结剂层的韧性和粘结强度。NWCT增强粘结剂层中SCF的桥接效应可以使载荷均匀并释放应力，从而提高粘结可靠性。

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