Dynamic tensile behaviour of re-entrant honeycombs

• Published in: International journal of impact engineering Vol. 139; p. 103497
• Main Authors: Zhang, Jianjun, Lu, Guoxing
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.05.2020; Elsevier BV
• Subjects: 3D printing; AlSi12 re-entrant honeycomb; Computer simulation; Deformation analysis; Deformation and tensile stress; Dynamic tensile experiments; FE simulations; Finite element method; Laser beam melting; Shock waves; Tensile tests; Topology; Unit-cell and multi-cell models; Dynamic tensile experiments; AlSi12 re-entrant honeycomb; FE simulations; Deformation and tensile stress; 3D printing; Unit-cell and multi-cell models
• ISSN: 0734-743X; 1879-3509
• DOI: 10.1016/j.ijimpeng.2019.103497

•Dynamic tensile experiments are performed on re-entrant honeycombs.•The deformation and tensile force/stress of the re-entrant cells and re-entrant honeycombs are systematically simulated.•Three deformation modes are classified, and the corresponding critical conditions are determined for the mode transformation.•Wave-like deformation in re-entrant honeycombs is analysed, and the dynamic tensile force is predicted, which agrees well with the FE dynamic force. This work reports on the dynamic tensile behaviour of an auxetic structure, namely, honeycomb with representative re-entrant topology. Quasi-static and dynamic tensile tests were conducted by employing MTS and Instron VHS 8800 hydraulic testing machines, respectively. The re-entrant samples were printed using AlSi12 powder via the selective laser melting (SLM) process. The deformation and force – displacement curves were of interest. A good agreement was observed between the numerical simulations and the experimental results. Subsequently, numerous finite element (FE) simulations were performed through ABAQUS/Explicit. Three deformation modes were classified, especially with a tensile shock wave observed within the Localised deformation mode. An analytical equation was obtained for the dynamic force of such materials under tension, which agrees well with the FE result. The effect of loading velocity and cell geometries was considered.