Ngwangwa Harry, Pandelani Thanyani, Msibi Makhosasana, Mabuda Israel, Semakane Letlhogonolo, Nemavhola Fulufhelo
Unisa Biomedical Engineering Research Group, Department of Mechanical Engineering, School of Engineering, College of Science Engineering and Technology, University of South Africa, Pretoria, 0001, South Africa.
Defence and Security, Council for Scientific and Industrial Research (CSIR), Pretoria, 0001, South Africa.
Heliyon. 2022 May 5;8(5):e09312. doi: 10.1016/j.heliyon.2022.e09312. eCollection 2022 May.
High quality computational model of soft tissues is a function of accurate and reliable mechanical properties. Hyperelastic constitutive models are normally utilised in developing reliable computational models. Therefore, section of proper and reliable constitutive models for soft tissue is critical. This work presents the biomechanical properties of oesophagus subjected to biaxial mechanical tensile test. Additionally, six hyperelastic constitutive models commonly used for modelling behaviour of soft tissues were selected. The experimental data were then fitted on Fung, Choi-Vito, Holzapfel (2000), Holzapfel (2005), Polynomial (Anisotropic) and Four-Fiber Family hyperelastic constitutive models. The sheep oesophagus subjected to equi-biaxial tension has exhibited different stress magnitude in both longitudinal and circumferential directions. There is significant difference between circumferential and longitudinal stresses (p = 0.0034). The average circumferential and longitudinal stresses are recorded to be 82.87 ± 30.36 kPa and 41.42 ± 32.02 kPa, respectively (p = 0.0034). Between six hyperelastic constitutive models, it was observed that Four-Fiber model has produced better fit when compared to others. After fitting biaxial mechanical properties of oesophagus, it was found that the Four-fiber family hyperelastic constitutive model would best fit.
高质量的软组织计算模型取决于准确可靠的力学性能。超弹性本构模型通常用于开发可靠的计算模型。因此，选择合适且可靠的软组织本构模型至关重要。这项工作展示了食管在双轴机械拉伸试验下的生物力学特性。此外，还选择了六种常用于模拟软组织行为的超弹性本构模型。然后将实验数据拟合到冯氏、崔 - 维托、霍尔扎菲尔（2000）、霍尔扎菲尔（2005）、多项式（各向异性）和四纤维族超弹性本构模型上。承受等双轴拉伸的羊食管在纵向和周向均表现出不同的应力大小。周向应力和纵向应力之间存在显著差异（p = 0.0034）。记录的平均周向应力和纵向应力分别为82.87 ± 30.36 kPa和41.42 ± 32.02 kPa（p = 0.0034）。在六种超弹性本构模型中，观察到与其他模型相比，四纤维模型拟合效果更好。在拟合食管的双轴力学性能后，发现四纤维族超弹性本构模型拟合效果最佳。
