CFRP-铝合金板单、双搭接胶接接头刚度退化机理

doi:10.11896/cldb.21050092

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Abstract The single and double lap bonding samples with different lap lengths were prepared using carbon fiber reinforced plastics and aluminum alloys, to investigate the tensile failure characteristics and failure morphology of joints. Firstly,the electronic universal testing machine, digital image correlation (DIC) technology and scanning electron microscope (SEM) were used for tensile tests, obtaining the load-displacement curves, surface strain distribution and failure morphology of the joints. Secondly, the simulation software was used to build the sample models based on the experimental data. The 3D Hashin and cohesive zone model (CZM) were used to simulate the damage of the composite material and the adhesive layer. The simulation results were compared with the experiment results, to verify the effectiveness of the simulation model. At the same time, the failure morphology of the first three resin layers were obtained. Finally, the experiment and simulation results were analyzed to study the failure mechanism of single and double lap joints with different lap lengths, by comparing the difference between strain distribution characteristics and failure process of single and double lap joints. The results show that the strain distribution of the single lap joint is quite different from that of the double lap joint. Single lap joints are damaged by the coupling effect of shear and peel load, while double lap joints are damaged by pure shear. Under the tensile load, single lap joint and double lap joints show a considerable difference in the crack propagation path, due to the distinction of strain distribution.

Key words： composite adhesive joint crack propagation FEM strain field distribution digital image correlation (DIC)

Published: 10 October 2022 Online: 2022-10-12

CLC number:

TB332

Fund:National Natural Science Foundation of China (52071069)

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	ZOU Tianchun
	LI Longhui
	JU Yuezhang
	FU Ji
	LI Ye

Cite this article:

ZOU Tianchun,LI Longhui,JU Yuezhang, et al. Stiffness Degradation Mechanism of Single and Double Lap Bonded Joints of CFRP-Aluminum Alloy Plates[J]. Materials Reports, 2022, 36(19): 21050092-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21050092 OR http://www.mater-rep.com/EN/Y2022/V36/I19/21050092

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