Koyun Ön Çapraz Bağının Hiperelastik Malzeme Özelliklerinin In-Vitro ve 3 Boyutlu Sonlu Elemanlar Analizi ile Değerlendirilmesi.

Modeling of ligament tissues in computer simulations in biomechanics is important for achieving the simulation anatomically. These are often described as hyperelastic materials in these types of studies. However, in order to be defined as a hyperelastic material, a mathematical material model created with data obtained from tests such as tension, compression, and creep is needed. There are many phenomenological models that can be used as material models. In this study, ligament tissue simulation was created according to Neo-Hookean, Ogden 2nd Order and Yeoh 2nd Order hyperelastic material models. In-vitro uniaxial tensile testing of sheep anterior cruciate ligament was performed for data on the stressstrain curve to be used by the models. According to the data obtained from the tensile test, the material constants required for the material models were calculated. As a result of the analysis, it was determined that Ogden 2nd Order and Yeoh 2nd Order models were close results and Neo-Hookean model gave results with different stress values. The fit of the stress-strain curves obtained from three models and in-vitro test was evaluated according to the Root Mean Square Error(RMSE) values. RMSE values of Neo-Hookean, Ogden 2nd Order and Yeoh 2nd Order hyperelastic material models were obtained as 4.9597, 1.9704 and 2.3644, respectively. As a result, the Ogden 2nd Order hyperelastic material model with a high number of material constants produced results closer to in-vitro test results compared to both normal and von-mises stress values and RMSE values. Among the three models analyzed for simulations of ligament tissue, it was determined that the use of this material model was more appropriate. [ABSTRACT FROM AUTHOR]