Stiffness evaluation of the SCS. a) Schematic of the three-point bending test; i) front view; ii) top view; iii) photograph; iv) side view; v) relationship between the load P and deflection δ. b) Load-deflection curve obtained by three-point bending test; i) before contact; ii) start of the test; iii) loaded. c) Confirmation of anisotropy of stiffness. d) Anisotropy test results. The load-deflection curves are significantly different in the x- and y-directions.