Tensile Properties and Failure Mechanisms Analysis of Composite Hybrid Structures Based on Metal Skeletons
WU Duoduo1,2, ZHENG Huilong1,*, KANG Zhenya1, XI Changqing1, ZHANG Tan1
1 Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China 2 School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
Abstract: Anew hybrid structure is designed which combines metal additive manufacturing, composite weaving and composite stitching processes. After the metal part and woven composite are fixed by normal stitching, the sample is finally formed by the co-curing process. This structure avoids the problems associated with conventional hybrid methods such as delamination failure, and enables flexible forming and stable joining of metal and composite materials on a macroscopic scale. The mechanical properties and failure modes of this new hybrid structure under quasistatic tensile loading are investigated by non-contact image measurement and analysis techniques. The results show that: the delamination cracks originate from the strain difference and shear stress between the different material layers, while the stitching fibres can inhibit the crack extension at the delamination interface and improve the fracture toughness; the tensile strength of the hybrid structure decreases with the thickness of the structure increasing, and only changing the pre-determined hole shape has no significant effect on the general mechanical properties of the hybrid structure; the hybrid structure is affected by various failure modes, mainly involving warp fracture, matrix failure, fracture and pull-out of the suture fibres, plastic failure of the metal, etc.
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2022, Vol. 36 
