This work develops an inverse procedure which combines an improved niche genetic algorithm,
finite element models and experimental data to identify material parameters of biological
tissues behaving like hyperelastic materials. A novel objective function is proposed with
two coefficients, which controls the contributions in a well-balanced fashion, respectively,
for the small deformation stage and the large deformation stage. This allows us to obtain
a global minimizer (of material constants) for the error between FEM solutions and experimental
data. Moreover, simple uniaxial compression tests at two different angles (0◦ and
90◦) with respect to the muscle fiber orientation are performed on fresh muscle tissues. This
enables us to obtain anisotropic properties of the muscle tissue from the present inverse
procedure. The result shows that the proposed inverse procedure is stable and reliable to
determine material constants in hyperelastic models for soft biological tissues like skeletal
muscles considering anisotropy.
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