EQUIVALENT MECHANICAL PROPERTIES OF ADDITIVELY MANUFACTURED OCTAGONAL HONEYCOMBS: THEORETICAL AND EXPERIMENTAL ANALYSIS

Equivalent mechanical properties are presented for additively manufactured octagonal honeycomb structures in this paper. Based on classical beam theory, the stiffness matrix of octagonal honeycomb structure is obtained analytically. Based on this, the analytical expressions of elastic modulus, Poisson's ratio and yield strength of octagonal honeycomb structures are derived. The octagonal honeycomb structures are printed by fused deposition modeling (FDM) technology, and the mechanical properties are obtained by uniaxial quasistatic compression test. In addition, the quasistatic compression finite element model of octagonal honeycomb structure is established. Finally, the comparisons of the theoretical results with the numerical results, the experimental results and the literature results verify the accuracy and effectiveness of the analytical expressions derived in this paper for the mechanical properties of octagonal honeycomb structures.