With the increasing frequency of human space activities,the orbital space environment is deteriora-ting.It is of great practical significance to enhance the strength and toughness of spacecraft structures.High strength&toughness bio-inspired helicoidal composite metastructures with mid-plane symmetry characteristics were designed and a corresponding hot-pressing preparation process was developed.The carbon fibre rein-forced polymer metastructures with cross-ply,quasi-isotropic and 5°,10° and 20° helicoidal lay-ups were char-acterized by quasi-static indentation performance tests,and the damage modes and the failure mechanisms were analyzed.The load-displacement curves,peak forces,failure displacements,stiffnesses and energy absorp-tions,were used as the mechanical property measures,with the thicknesses of the structures including 37 and 73 layers.The results show that,compared with the traditional lay-up method,the symmetric helicoidal lay-up can effectively reduce the interlayer stress and significantly improve the quasi-static indentation performances of the metastructures.Especially with a helicoidal angle of 10°,the metastructures have excellent performance en-hancement in terms of peak loads and energy absorptions.The research results not only provide a theoretical support for the design and fabrication of high-performance composite metastructures in the aerospace field,but also lay a practical foundation for their practical application.
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