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Enhancing adhesive bond strength of CFRP/titanium joints through NaOH anodising and resin pre-coating treatments with optimised anodising conditions

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Chinese Journal of Aeronautics 2024年第2期37卷 511-523页

作者： Yunsen HU Jingheng ZHANG Lin WANG Fei CHENG Xiaozhi HU School of Materials and Chemistry Southwest University of Science and TechnologyMianyang 621000China School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Engineering Research Center of Biomass Materials Ministry of EducationSouthwest University of Science and TechnologyMianyang 621010China Department of Mechanical Engineering University of Western AustraliaPerthWA 6009Australia

adhesively Bonded Carbon Fibre Reinforced Plastic(CFRP)and titanium alloy have been extensively used as a hybrid structure in modern aircrafts due to their excellent combination of mechanical properties and chemical stabilities.This study utilised NaOH anodising method to create micro-rough titanium surfaces for enhancing adhesive bonding between titanium alloy and CFRP laminates.A special and simple technique named Resin Pre-Coating(RPC)was also employed to improve the surface wetting of anodised titanium and grinded CFRP substrates.The influences of anodising temperature and duration on the surface morphology,wettability and adhesive bond strength were investigated.The single lap shear test results showed that the bond strength of specimens anodised at 20℃for 15 min improved by 135.9%and 95.4%,respectively,in comparison with that of acid pickled and grinded specimens(without RPC treatment).Although increasing the anodising temperature and duration produced rougher titanium surfaces,the adhesively bonded joints were not strong enough due to relatively friable titanium oxide layers.

关键词： Carbon Fibre Reinforced Polymer(CFRP) Titanium alloy Anodising Resin pre-coating adhesive joints

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The Influence of Combined Hygrothermal Environment and Load on the Performance of adhesively bonded CFRP-Aluminum Alloy joints

The Influence of Combined Hygrothermal Environment and Load ...

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2018中国汽车工程学会年会

作者： NA Jingxin MU Wenlong QIN Guofeng TAN Wei Jilin University State Key Laboratory of Automotive Simulation and Control

To provide reference and guidance for the design of the adhesive structures of the CFRP-aluminum alloy in the actual service environments,the aging laws of the adhesive joints under the hot,humid environment and the load were studied in this paper,and a prediction method considering different aging conditions was proposed based on the cohesive zone model.The structural adhesive Araldite 2015 was selected to fabricate the CFRP-aluminum alloy butt joint,and the aging tests were carried out under the condition of hygrothermal cycle,combined hygrothemial cycle and static load,combined hygrothemial cycle and alternating load.The residual strength and failure modes of the joint after aging were analyzed.The results showed that the strength of joints decreased markedly after 60 hours of hygrothermal cycle.The load further aggravates the aging of the joint,and the dynamic alternating load has more influence on the failure strength of the joint than the static load;At the same time,the joint failure mode has changed after aging,and compared to the selected CFRP,adhesive performance decreased more obviously;The damage factors under different aging conditions were defined,combined with the failure criterion obtained by the test,the classical double linear traction-displacement cohesion rule is modified,and the residual strength of the adhesive joint after aging is predicted by numerical simulation analysis.

关键词： carbon FRP adhesive joints hygrothermal cycle load failure prediction

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