Compressive mechanical property of a new three-dimensional aluminum based double-V lattice structure

A new three-dimensional (3D) double-V lattice structure intersected by two-dimensional (2D) double-V structures with negative Poisson's ratio was designed and fabricated by 3-D printing combined with investment casting method. The compressive mechanical behavior and the related mechanism of the new double-V structures have been analyzed. It is shown that the new structure shows a gradual hardening characteristic in the plateau stage and exhibits tunable auxetic behavior with varied structure parameters, i.e., the auxetic behavior becomes more pronounced as theta(1) and theta(2) decrease. (C) 2019 Elsevier B.V. All rights reserved.