Physical and Mechanical Characteristics of Biomaterials (Patches) for Problems of Numerical Simulation

Five commercial patches and one unchanged native bovine xenopericardium are studied on a test setup to supplement the existing data on the physical and mechanical properties of commercial patches used for reconstructive interventions on the heart and blood vessels and to adapt the corresponding models for applications in computer simulation environment. The models are verified under conditions for numerical simulation of the uniaxial tension experiment using the finite element method. The full-scale study of physical and mechanical properties shows that all materials exhibit developed nonlinearity, which is manifested as an initial low-slope fragment of stress with a subsequent increase in rigidity. The results of numerical verification of the coefficients for models of hyperelastic materials show high convergence with the results of field tests. The results of evaluation of the physical and mechanical properties of patches for reconstructive surgery of the heart and blood vessels used in the Russian Federation are presented. The resulting coefficients of the models for these materials can be used in the environment of engineering analysis for the problems of numerical simulation using the finite element method.