Material Identification of the Human Abdominal Wall Based On the Isogeometric Shell Model - Publication - Bridge of Knowledge

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Material Identification of the Human Abdominal Wall Based On the Isogeometric Shell Model

Abstract

The human abdominal wall is an object of interest to the research community in the context of ventral hernia repair. Computer models require a priori knowledge of constitutive parameters in order to establish its mechanical response. In this work, the Finite Element Model Updating (FEMU) method is used to identify an heterogeneous shear modulus distribution for a human abdominal wall model, which is based on nonlinear isogeometric Kirchhoff-Love shell formulation and the geometry obtained experimentally. Displacements on the boundary are fixed, and an intraperitoneal pressure of 1600 Pa is applied. A hyperelastic Koiter-Gasser-Ogden-Holzapfel shell material model is used. The heterogeneous distribution of the shear modulus is interpolated by 24 nodal values. The inverse solution is obtained by the minimization of the objective function, based on the difference between the deformation obtained from the analysis and the experiment – here an experiment-like FE solution with prescribed reference material distribution, and addition of Gaussian noise. The mean relative error between reference solution and identified parameters is 1.34 %, while stress and bending moments deviations are below 0.01%.

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Details

Category:
Conference activity
Type:
publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
Language:
English
Publication year:
2020
Bibliographic description:
Borzeszkowski B., Duong T., Lubowiecka I., Sauer R.: Material Identification of the Human Abdominal Wall Based On the Isogeometric Shell Model// / : , 2020,
Sources of funding:
Verified by:
Gdańsk University of Technology

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