Mechanical properties of 3D re-entrant honeycomb auxetic structures realized via additive manufacturing

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Auxetic mechanical metamaterials (2017, unknown): “Yang et al. (2015) successfully established such an analytical model, which was later veri  ed by FE modeling and experiments to be relatively accurate at predicting the performance of the auxetic structure beyond the elastic limit.”
Compressive properties of 3D printed auxetic structures: experimental and numerical studies (2020, background): “large NPR) when it is compressed in the Y direction (Yang et al. 2015).”
Auxetic mechanical metamaterials: from soft to stiff (2023, methodology): “Yang et al [102] investigated a 3D re-entrant”
Auxetic metamaterials and structures: a review (2018, unknown): “The 3D re-entrant models: (a) unit cell; (b) 3D lattice [67].”