Med Biol Eng Comput - Strain rate-dependent viscohyperelastic constitutive modeling of bovine liver tissue.

Tópicos

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Resumo

The mechanical response of most soft tissue is considered to be viscohyperelastic, making the development of accurate constitutive models a challenging task. In this article, we present a constitutive model for bovine liver tissue that utilizes a viscous dissipation potential, and use it to model the response of bovine liver tissue at strain rates ranging from 0.001 to 0.04 s(-1). On the material modeling front of this study, the free energy is assumed to depend on the right Cauchy-Green deformation tensor, whereas a separate rate-dependent viscous potential is posited to characterize viscoelasticity. This viscous dissipation component is a function of the time rate of change of the right Cauchy-Green deformation tensor. On the experimental front, no-slip uniaxial compression experiments are conducted on bovine liver tissue at various strain rates. A numerical correction approach is used to account for the no-slip edge conditions, and the constitutive model is fit to the resulting corrected stress-strain data. The complete derivation of the material model, its implementation in the finite element software package ABAQUS, and a validation study are presented in this article. The results show that bovine liver tissue exhibits a strong strain-rate dependence even at the low strain rates considered here and that the proposed constitutive model is able to accurately describe this response.

Resumo Limpo

mechan respons soft tissu consid viscohyperelast make develop accur constitut model challeng task articl present constitut model bovin liver tissu util viscous dissip potenti use model respons bovin liver tissu strain rate rang s materi model front studi free energi assum depend right cauchygreen deform tensor wherea separ ratedepend viscous potenti posit character viscoelast viscous dissip compon function time rate chang right cauchygreen deform tensor experiment front noslip uniaxi compress experi conduct bovin liver tissu various strain rate numer correct approach use account noslip edg condit constitut model fit result correct stressstrain data complet deriv materi model implement finit element softwar packag abaqus valid studi present articl result show bovin liver tissu exhibit strong strainrat depend even low strain rate consid propos constitut model abl accur describ respons

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