Fig. 1. The details of kirigami pattern. (a) Representative pattern: L1 = 12L0, L2 = 6.5L0, L0 = U0, 2r =0.06 mm, W =8 mm; (b)-(k) corresponding to unit sizes of 150 μm, 225 μm, 300 μm, 375 μm, 450 μm, 525 μm, 600 μm, 675 μm, 750 μm, and 900 μm, respectively.

Fig. 2. Beam deflection analysis. (a) Morphology of the kirigami patterns under the tensile deformation; (b) Enlarged view of the rhombic unit in the tensile response; (c) Enlarged view of the beam in the tensile response; (d) Enlarged view of the beam deflection unit in the tensile response.

Fig. 3. Tension curve of kirigami metallic glass with the corresponding morphology. (a) The kirigami-inspired strain-force curve. Insert shows the enlarged strain-load curve corresponding to the region covered by dash line and the side view of the samples during in-plane stage and out-of-plane stages; (b) The front view of the sample during in-plane deformation stage; (c) The front view of the sample during out-of-plane soft deformation stage; (d) The front view of the sample during out-of-plane rigid deformation stage.

Fig. 4. The load-strain curves of kirigami metallic glass. (a) Repeat tests of different kirigami patterns; (b) Representative test of different kirigami patterns. Insert shows the enlarged curve corresponding to the region covered by dash line. The labels of 150, 225, 300, 375, 450, 525, 600, 675, 750, 900 corresponds to the kirigami unit size, U0, of 150 μm, 225 μm, 300 μm, 375 μm, 450 μm, 525 μm, 600 μm, 675 μm, 750 μm, and 900 μm, respectively. The labels of a, b, and c correspond to different tensile samples with same kirigami unit size.

Fig. 5. Double logarithmic curves of absolute load of stage I - kirigami unit size (a); absolute load of stage II - kirigami unit size (b), and absolute load of stage III - kirigami unit size (c). The experimental data are fitted with the function y=axb represented by a red line, while the black scattered squares represent the experimental data.

Fig. 6. The mechanical response of load-strain slope of stage II as a function of kirigami unit size.

Fig. 7. (a) Experimental and stimulated kirigami-inspired strain-force curve; (b) Finite element method (FEM) simulation shows the front view and side view of the stress distribution of the tensile sample during the out-of-plane rigid deformation stage; (c) FEM simulation shows the enlarged images of the stress concentration regions circled by black rectangle in (b).