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Hypoelastic soft tissues. Part I: Theory

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Abstract

Refinements are made to an existing hypoelastic theory developed by Freed [18, 19] for the purpose of modeling the passive response of soft, fibrous, biological tissues. Oldroyd’s [27] operators for convected differentiation and integration, which he derived from the tensor transformation law, are re-derived here from an integral equation defined in the polar configuration. Fields that obey these convected polar operators are said to be viable tensor fields, from which a new definition for strain and its rate are obtained and applied to a hypoelastic theory for tissue. Anisotropy is addressed through a material tensor, from which viable tensor fields describing fiber strain and strain rate are constructed. Material anisotropy and material constitution are handled separately for maximum flexibility. Isochoric hypoelastic models for isotropic, anisotropic, and fiber/matrix composite materials are derived. A material function is introduced to address special attributes that biological fibers impart on tissue behavior, four of which are proposed that represent various ways through which the fiber constituents might be described. Application to in-plane biaxial deformation is the focus of part II of this paper [23].

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  1. Clifford H. Spicer Chair in Engineering, Saginaw Valley State University, 202 Pioneer Hall, 7400 Bay Road, University Center, MI, 48710, USA

    Alan David Freed

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  1. Alan David Freed
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Correspondence to Alan David Freed.

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Freed, A.D. Hypoelastic soft tissues. Part I: Theory. Acta Mech 213, 189–204 (2010). https://doi.org/10.1007/s00707-009-0276-y

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