Modelling of Knitted Abdominal Implant in the Context of Constitutive Law Selection

Four hyperelastic anizotropic constitutive equations are considered to model a selected knitted abdominal implant. The goal was to select the model, which provides numerical response of the implant under pressure load the closest to experimentally observed. The compared quantity was the position of the extreme reaction force induced by the pressure in the implant supports. All considered models revealed similar qualitative results, showing anizotropy of the material with preferential directions oblique to the implant knitting pattern. However, Gasser-Ogden-Holzapfel model showed the preferential direction closest to the experimentally determined and thus can be best recommended to model knitted abdominal implant under pressure load.