Figure 4

(A) Test for rotational stiffness using a torsional stiffness tester (DPTST; DYPHI). (B) Test for axial compression using an electrohydraulic materials test system (model 3366; Instron, Norwood, Massachusetts). (C) Test for four-point bending using an electrohydraulic materials test system (model 3366; Instron, Norwood, Massachusetts).