Abstract
The 3D printing process for continuous fibers offers a new approach to the fabrication of lattice structures. In this paper, a planning method for a single cell trajectory of the lattice structure is proposed. Lattice sandwich structures with different strut numbers and angles are prepared according to this method. Out-of-plane compression tests are also carried out. Theoretical prediction models for the compressive strength of tetrahedral, pyramidal and hexagonal cone structures are developed, with errors within 32.8% compared to experimental results. The effects of strut angle, number and material on the compressive properties and energy absorption capacity of the lattice sandwich structure are analyzed. The pyramidal structure with continuous fibers reinforced 60° struts has the optimum specific compression strength of 10.115MPa/(g/cm3). Defects such as voids, fiber pull-out and cracking of the resin matrix are observed in the strut section. It is found that strut fracture and delamination are the main failure modes of lattice structures under compressive loading.
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