Preparation of new fiber reinforced 3D kagome lattice composite materials

Lightweight lattice composites exhibit excellent mechanical properties and potential multifunctionality. The 3D-Kagome lattice structure is theoretically recognized as one of the superior configurations among classical core designs. This study proposes a novel fabrication method for 3D-Kagome lattice composites. The approach involves designing specialized 3D-Kagome moldings using continuous fiber ropes as raw materials, combined with innovative spatial weaving techniques and resin curing processes. This successfully produced new 3D-Kagome lattice composites, effectively addressing key technical challenges such as the limited application of long fibers in additive manufacturing and the susceptibility to damage in joint assembly methods. By preparing two types and two size specifications of specimens for flat compression tests, the compressive response characteristics of the material were obtained. Three sets of compression curves displayed distinct failure modes, and the causes of secondary peaks under each mode were analyzed. The results indicate that the conventional-type specimens with higher relative density achieved a 34.6% increase in compressive strength, while the improved structural type also demonstrated enhanced strength at the same dimensions. Electron microscopy experiments further revealed that the primary failure mechanisms of the material involve diagonal bar fracture and joint damage. This research validates the feasibility of spatial weaving methods for producing 3D-Kagome structures, offering new insights for the fabrication of fiber lattice composites.