Fundamental Study on the Clarification of Rupture Mechanism in Tendon and the Characterization of Damage Healing Process using Acoustic Information

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The microdamage of rabbit patellar tendon under static tensile load was detected by AE technique. The damage process of intact and injured tendon was successfully monitored. It was found that the higher amplitude AE signals were detected before the maximum stress under the higher loading rate. It was then suggested that larger scale of microdamages, such as bundles of fibers, ruptured simultaneously under the higher loading rate. AE source location was corresponded with the area where the local strain increased. Consequently, the fundamental insights for the damage monitoring technique which are indispensable for the optimization of programs of sports training or rehabilitation are obtained.