You are testing anterior cruciate ligament (ACL) reconstructions with an orthopaedic surgeon. You recorded the following load-deformation data for an experimental femur-ACL-tibia reconstruction in an animal model. The harvested reconstructions were tested in tension until the ligament reached failure. The ACL cross-sectional area was 130 mm2 and the bone-to-bone resting length of the ligament was 2.9 cm. (a) When performing this test, name one thing that had to be done during the testing procedure that would not be done if you were performing a test on a metal specimen.