Study on quasi-static axial compression performances and energy absorption of four-star double arrow honeycomb

Abstract

A four-star double arrow honeycomb (FS-DAH) is proposed. Firstly, representative cell of FS-DAH is chosen by adopting asymptotic homogenization method. Then, in-plane large deflection equations along X and Y compression directions are constructed by utilizing elliptic integral approach, elastic modulus, Poisson's ratio and platform stress of FS-DAH are derived.Subsequently, finite element model (FEM) of FS-DAH is constructed, and quasi-static axial compression simulation analysis is executed. To further verify the accuracy of theoretical predictions and FEM, samples with PLA material are manufactured by employing 3D printing technology, and quasi-static compression test is conducted. The results indicate that FS-DAH exhibit “zigzag” deformation mode along transverse direction and “wave” deformation mode along longitudinal direction under Y compression and “><” deformation mode appears under X compression, which are both consistent with simulation analysis. Moreover, there exist two platform regions and one platform zone along Y and X directions for stress–strain curves accordingly, the errors of simulation and theoretical results are within allowable range compared with test in terms of elastic modulus, platform stress and Poisson’s ratio. Eventually, FEMs with various concave angles and cell number are investigated, and its unit mass energy absorption decreases with the increment of concave angle and cell number.