Abstract
The biomimetic interface of Al/CFRP hybrid composite material was obtained by combining laser surface treatment and hot-pressing process. The experimental results showed that the tensile shear strength and fracture energy of the biomimetic interface were 44.5 MPa and 1652 J/m2, which were 224% and 72.6% higher than those of the untreated interface. The new C-O-Al chemical bond was formed at the biomimetic interface, which replaced the van der Waals force and improved the interface strength. The transition layer of the biomimetic interface can effectively delay the transmission of cracks at the interface. The finite element results showed that the stress distribution of biomimetic interface was uniform and stress concentration was not obvious. The strengthening and toughening effect of the interface is mainly due to the pinning effect of mechanical interlocking of the interface and the behavior of crack deflection of the transition layer.
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