To create the toe region, a small stress causes the fibers in the tendon begin to align in the direction of the stress, or uncrimp, and the re-alignment provides additional length. Within the linear r...To create the toe region, a small stress causes the fibers in the tendon begin to align in the direction of the stress, or uncrimp, and the re-alignment provides additional length. Within the linear region there is a constant relation between changes in stress and changes in strain, so the slope of the stress vs. The change in stress is the same between each test because you add the same number of pennies each test, but is the change in strain you measured the same each time?
