关键词: 增材制造, 连续碳纤维增强, 树脂基复合材料, 仿生蜻蜓翅脉结构, 力学性能

Abstract:

The dragonfly wing structure with excellent lightweight and high strength performance was taken as the design inspiration. On the basis of analyzing the impact resistance principle of the wing vein grid structure, the traditional and bionic structures were designed. Continuous carbon fiber reinforced polylactic acid (PLA) composites with different structures were successfully prepared by melt extrusion 3D printer, and the tensile and impact properties of the composites with different structures were tested and analyzed. The results showed that the improvement of the tensile strength of the biomimetic composite was limited by the relatively small content of continuous carbon fiber in the direction of tensile force, but the average tensile strength of the biomimetic composite was 1.18 times that of the traditional structure. When the biomimetic structure composite sample was subjected to impact force, the connection angle of hexagons inside it would change, which would greatly consume impact energy. Meanwhile, the continuous carbon fiber with hexagonal grid structure can effectively hinder the crack propagation, and thus the average impact toughness of biomimetic structure can reach 2.46 times that of traditional structure. Biomimetic dragonfly wing structure can significantly enhance the comprehensive mechanical properties of additive manufacturing composites, and improve the impact resistance of concrete outstanding effect. The effective and feasible structure design and additive manufacturing of continuous carbon fiber reinforced resin matrix composites can greatly expand their corresponding applications in the field of high impact loads.

Key words: additive manufacturing, continuous carbon fiber reinforced, resin matrix composites, bionic dragonfly wing vein structure, mechanical property