An experimental and numerical study on the transverse deformations in tensile test of tendons
| Autor: | Ana Bárbara Krummenauer Formenton, Jakson Manfredini Vassoler, Carlos Rodrigo de Mello Roesler, Bruno Klahr, Thiago André Carniel, Eduardo Alberto Fancello |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Auxetics Swine Quantitative Biology::Tissues and Organs 0206 medical engineering Biomedical Engineering Biophysics 02 engineering and technology Kinematics Models Biological Tendons 03 medical and health sciences 0302 clinical medicine Tensile Strength Ultimate tensile strength Volume reduction Animals Orthopedics and Sports Medicine Tensile testing Rehabilitation Mechanics 020601 biomedical engineering Clamping Finite element method Elasticity Biomechanical Phenomena Transverse plane Stress Mechanical 030217 neurology & neurosurgery |
| Zdroj: | Journal of biomechanics. 87 |
| ISSN: | 1873-2380 |
| Popis: | The transverse deformations of tendons assessed in tensile tests seems to constitute a controversial issue in literature. On the one hand, large positive variations of the Poisson’s ratio have been reported, indicating volume reduction under tensile states. On the other hand, negative values were also observed, pointing out an auxetic material response. Based on these experimental observations, the following question is raised: Are these large and discrepant transverse deformations intrinsically related to the constitutive response of tendons or they result from artifacts of the mechanical test setup? In order to provide further insights to this question, an experimental and numerical study on the transverse kinematics of tendons was carried out. Tensile experiments were performed in branches of deep digital flexor tendons of domestic porcine, where the transverse displacements were measured by two high-speed, high-accuracy optical digital micrometers placed transversely to one another. Aiming at a better understanding of the effects of the mechanical test setup in the transverse measurements, a three-dimensional finite element model is proposed to resemble the tensile experiment. The main achieved results strongly support the following hypotheses regarding tensile tests of tendons: the clamping region considerably affects the kinematics of the specimen even at a large distance from the clamps; the transverse deformations are mainly ruled by stiff fibers embedded in a soft matrix; the generalization of the Poisson’s ratio to draw conclusions about changes in volume of tendons may lead to misinterpretations. |
| Databáze: | OpenAIRE |
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