Mechanical response of a compressed novel 3D tetrachiral structure processed by MJF 3D printing process. (2021) - Srinivas, Rohit P.
Abstract: The compressive properties of a novel 3D tetrachiral auxetic structure have been investigated in this study. The 3D unit cell has been developed with solid cubes and struts. Two types of this structure with different struts lengths have been proposed. A 3D printing process, Multi Jet Fusion (MJF) has been employed to print six samples from polyamide 12 (PA 12). Quasi-static compressive tests have been performed in the X, Y, and Z directions to investigate the mechanical response and auxetic feature. Finite element (FE) models have been developed using ANSYS/LS-DYNA. The experimental microscopic measurements reveal high accuracy of MJF process and consistent deposition of the material powder. The proposed structure type S2 (short struts) displays auxetic feature while the auxetic feature of type S1 (long struts) is not evident. The energy absorption capability of the proposed structure varied corresponding to the load direction. The FEA results show that the energy absorption of the proposed structure type S2 outperforms that of type S1.