Fig. 2
Typical examples of experimental setup (A) and data analysis process (B, C) for tensile testing. The ends of the tendon specimens were fixed to the clamps of material testing machine (A). Force and length were measured by tensile testing, and a force–length relationship was derived (B). The stress (N/mm2) was calculated by dividing the force by the cross-sectional area of the specimen, and the strain (%) was calculated by dividing the displacement (i.e., change in length) of the specimen by its initial length (C). The Young’s modulus of each specimen was calculated as the slope of the regression line in the linear region of the stress–strain curve