Fig. 1. Modeling of a unit-cell of metamaterial

Fig. 2. Tension‒shear-coupled deformation of the unit-cell. (a) Deformation model of the unit-cell; (b) planar rigid frame after simplification of the unit-cell

Fig. 3. Tension‒shear-coupled deformation analysis of the unit-cell

Fig. 4. Designing method based on stacking of unit-cells

Fig. 5. Tension‒twist-coupled deformation for the cantilever beam. (a) Schematic of cantilever beams produced by stacking of cells;

Fig. 6. Modeling of the macro-structure

Fig. 7. Normalized equivalent modulus of elasticity for the metamaterial

Fig. 8. Finite element modelling (FEM) and analysis of the cantilever beam. (a) FEM of the cantilever beam; (b) cloud figure of coupled tension‒twist deformation for the cantilever beam

Fig. 9. Distribution of twist angle for the cantilever beam

Fig. 10. Samples made by SLS and the testing equipment. (a) Four cells combination cantilever beam; (b) two cells combination cantilever beam; (c) testing equipment

Fig. 11. Schematic of twist angle measurement for the structure

Fig. 12. Relation between twist angle and tensile force for the cantilever beams

Fig. 13. Comparison of tensile force-twisting coupling coefficient and mass of two cantilever beams

Fig. 14. Relation between twist angle of the cantilever beam and the number of stacking layers