Authors: V. H. Carneiro, S. D. Rawson, H. Puga, J. Meireles, P. J. Withers

Cellular solids are materials with a high strength-density ratio. Current hybrid additive manufacturing investment casting techniques allow the manufacturing of non-stochastic geometries with tailored properties, e.g. negative Poisson’s ratio. This study explores the collapse mechanism of cellular solids with negative, zero and positive Poisson’s ratios. Compression testing and microcomputed tomography are used to compare the apparent stress strain and in-situ deformations of these architectures. Cellular solids with a negative Poisson’s ratio (i.e. auxetics) collapse with local deformation and dynamic densification, allowing the elevation of the Apparent Modulus and Collapse Strength relatively to samples with a positive Poisson’s ratio.

V. H. Carneiro^{1 |} S. D. Rawson^{2 |} H. Puga^{3 |} J. Meireles^{1 |} P. J. Withers²
1MEtRiCS-University of Minho;
2The Henry Royce Institute, Department of Materials, The University of Manchester;
3CMEMS-UMinho, University of Minho;