Abstract
In order to enhance the mechanical property of auxetic lattice structures, a new enhanced auxetic lattice structure was designed by embedding narrow struts into a three-dimensional (3D) re-entrant lattice structure. A series of enhanced lattice structures with varied parameters were fabricated by 3D printing combined with the molten metal infiltration technique. Based on the method, parameter studies were performed. The enhanced auxetic lattice structure was found to exhibit superior mechanical behaviors compared to the 3D re-entrant lattice structure. An interesting phenomenon showed that increasing the diameter of connecting struts led to less auxetic and non-auxetic structures. Moreover, the compressive property of the enhanced structure also exhibited obvious dependence on the base material and compression directions. The present study can provide useful information for the design, fabrication and application of new auxetic structures with enhanced properties.
Highlights
As a novel metamaterial, auxetic structures possess unconventional properties, i.e., they expand laterally under tension and shrink under compression, which are described by negative Poisson’s ratio
Auxetic structures have a wide range of applications in aerospace [9], biomedical engineering [10,11], sensors and actuators [12] and functional structures [2]
A large-scaled auxetic structure was first attained in the form of 2D silicone rubber or aluminum honeycombs deforming by flexure in 1982 [13]
Summary
Auxetic structures possess unconventional properties, i.e., they expand laterally under tension and shrink under compression, which are described by negative Poisson’s ratio. This unique behavior offers enormous improvement in the mechanical behavior of the structures, such as excellent shear stiffness [1,2], enhancement in fracture toughness [3], indentation resistance [4], high energy dissipation [5] and outstanding acoustic absorption abilities [6,7,8]. The chiral structures which were subjected to uniaxial in-plane force were studied and the in-plane Poisson’s ratio and elastic modulus were gained experimentally and numerically [15]. A lot of research is being carried out on auxetic lattice structures, the existing auxetic lattice structures still exhibit
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