a) Comparison between the photograph and the 3D model when n = 10 and L = 5, 10, 15 mm. b) Comparison of the second area moment derived from the simulation and obtained from the experiment. c) Mountain fold parts of the SCS after the three-point bending test. Deformation occurred at the crease parts, and uniform deformation of the cross-sectional structure did not occur. d) Three-point bending test results of the stacked SCS (1, 2, 3, and 10 sheets) and e) the calculated second area moment. As stacking increased, the slope of the initial stage increased, and the second area moment increased linearly. The error bars indicate ± 1 SD.