Journal
JOURNAL OF BIOMECHANICS
Volume 33, Issue 12, Pages 1729-1732Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0021-9290(00)00128-7
Keywords
stress relaxation; variables separation; soft tissues
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The hypothesis of variables separation, namely the time and the strain separation in the relaxation function, is widely used in soft tissue biomechanics. Although this hypothesis is central to several biomechanical models, only few experimental works have tried to verify it. From these studies, contradictory results have been found. Moreover, it has recently been noted that no such experimental verification has been performed for ligament tissues. In this paper, an experimental method is developed to test the hypothesis of variables separation. This method is then used with human cruciate ligaments and patellar tendons. It is shown that the use of the variables separation hypothesis is justified at least for strain values lower than 16% for anterior cruciate ligament, lower than 12% for posterior cruciate ligament and lower than 6% for patellar tendon. The method presented in this paper could be used to verify the validity of variables separation for other tissues, (C) 2000 Elsevier Science Ltd. All rights reserved.
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