Med Biol Eng Comput - Finite element modeling of mitral leaflet tissue using a layered shell approximation.

Tópicos

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Resumo

The current study presents a finite element model of mitral leaflet tissue, which incorporates the anisotropic material response and approximates the layered structure. First, continuum mechanics and the theory of layered composites are used to develop an analytical representation of membrane stress in the leaflet material. This is done with an existing anisotropic constitutive law from literature. Then, the concept is implemented in a finite element (FE) model by overlapping and merging two layers of transversely isotropic membrane elements in LS-DYNA, which homogenizes the response. The FE model is then used to simulate various biaxial extension tests and out-of-plane pressure loading. Both the analytical and FE model show good agreement with experimental biaxial extension data, and show good mutual agreement. This confirms that the layered composite approximation presented in the current study is able to capture the exponential stiffening seen in both the circumferential and radial directions of mitral leaflets.

Resumo Limpo

current studi present finit element model mitral leaflet tissu incorpor anisotrop materi respons approxim layer structur first continuum mechan theori layer composit use develop analyt represent membran stress leaflet materi done exist anisotrop constitut law literatur concept implement finit element fe model overlap merg two layer transvers isotrop membran element lsdyna homogen respons fe model use simul various biaxial extens test outofplan pressur load analyt fe model show good agreement experiment biaxial extens data show good mutual agreement confirm layer composit approxim present current studi abl captur exponenti stiffen seen circumferenti radial direct mitral leaflet

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