Ndlovu, ZDesai, DPandelani, Thanyani ANgwangwa, HNemavhola, F2022-04-192022-04-192022-02Ndlovu, Z., Desai, D., Pandelani, T.A., Ngwangwa, H. & Nemavhola, F. 2022. Biaxial estimation of biomechanical constitutive parameters of passive porcine sclera soft tissue. <i>Applied Bionics and Biomechanics.</i> http://hdl.handle.net/10204/123751176-23221754-2103doi: 10.1155/2022/4775595http://hdl.handle.net/10204/12375This study assesses the modelling capabilities of four constitutive hyperelastic material models to fit the experimental data of the porcine sclera soft tissue. It further estimates the material parameters and discusses their applicability to a finite element model by examining the statistical dispersion measured through the standard deviation. Fifteen sclera tissues were harvested from porcine’ slaughtered at an abattoir and were subjected to equi-biaxial testing. The results show that all the four material models yielded very good correlations at correlations above 96%. The polynomial (anisotropic) model gave the best correlation of 98%. However, the estimated material parameters varied widely from one test to another such that there would be need to normalise the test data to avoid long optimisation processes after applying the average material parameters to finite element models. However, for application of the estimated material parameters to finite element models, there would be need to consider normalising the test data to reduce the search region for the optimisation algorithms. Although the polynomial (anisotropic) model yielded the best correlation, it was found that the Choi-Vito had the least variation in the estimated material parameters, thereby making it an easier option for application of its material parameters to a finite element model and requiring minimum effort in the optimisation procedure. For the porcine sclera tissue, it was found that the anisotropy was more influenced by the fiber-related properties than the background material matrix-related properties.FulltextenSoft tissue mechanicsSclera tissuePorcine eyeBiaxial testingBiomechanical analysisConstitutive hyperplastic material modelsConstitutive parametersArticleNdlovu, Z., Desai, D., Pandelani, T. A., Ngwangwa, H., & Nemavhola, F. (2022). Biaxial estimation of biomechanical constitutive parameters of passive porcine sclera soft tissue. <i>Applied Bionics and Biomechanics</i>, http://hdl.handle.net/10204/12375Ndlovu, Z, D Desai, Thanyani A Pandelani, H Ngwangwa, and F Nemavhola "Biaxial estimation of biomechanical constitutive parameters of passive porcine sclera soft tissue." <i>Applied Bionics and Biomechanics</i> (2022) http://hdl.handle.net/10204/12375Ndlovu Z, Desai D, Pandelani TA, Ngwangwa H, Nemavhola F. Biaxial estimation of biomechanical constitutive parameters of passive porcine sclera soft tissue. Applied Bionics and Biomechanics. 2022; http://hdl.handle.net/10204/12375.TY - Article AU - Ndlovu, Z AU - Desai, D AU - Pandelani, Thanyani A AU - Ngwangwa, H AU - Nemavhola, F AB - This study assesses the modelling capabilities of four constitutive hyperelastic material models to fit the experimental data of the porcine sclera soft tissue. It further estimates the material parameters and discusses their applicability to a finite element model by examining the statistical dispersion measured through the standard deviation. Fifteen sclera tissues were harvested from porcine’ slaughtered at an abattoir and were subjected to equi-biaxial testing. The results show that all the four material models yielded very good correlations at correlations above 96%. The polynomial (anisotropic) model gave the best correlation of 98%. However, the estimated material parameters varied widely from one test to another such that there would be need to normalise the test data to avoid long optimisation processes after applying the average material parameters to finite element models. However, for application of the estimated material parameters to finite element models, there would be need to consider normalising the test data to reduce the search region for the optimisation algorithms. Although the polynomial (anisotropic) model yielded the best correlation, it was found that the Choi-Vito had the least variation in the estimated material parameters, thereby making it an easier option for application of its material parameters to a finite element model and requiring minimum effort in the optimisation procedure. For the porcine sclera tissue, it was found that the anisotropy was more influenced by the fiber-related properties than the background material matrix-related properties. DA - 2022-02 DB - ResearchSpace DP - CSIR J1 - Applied Bionics and Biomechanics KW - Soft tissue mechanics KW - Sclera tissue KW - Porcine eye KW - Biaxial testing KW - Biomechanical analysis KW - Constitutive hyperplastic material models KW - Constitutive parameters LK - https://researchspace.csir.co.za PY - 2022 SM - 1176-2322 SM - 1754-2103 T1 - Biaxial estimation of biomechanical constitutive parameters of passive porcine sclera soft tissue TI - Biaxial estimation of biomechanical constitutive parameters of passive porcine sclera soft tissue UR - http://hdl.handle.net/10204/12375 ER -25624