Homogenized estimates for soft fiber-composites and tissues with two families of fibers

Gal deBotton, Tal Oren, Gal Shmuel, Stephan Rudykh

Research output: Contribution to conferenceAbstract


The macroscopic response of hyperelastic fi ber composites is characterized in terms of the behaviors of their constituting phases. To this end, we make use of a unique representation of the deformation gradient in terms of a set of transversely isotropic invariants. Respectively, these invariants correspond to extension along the fi bers, transverse dilatation, out-of-plane shear along the fi bers, in-plane shear in the transverse plane, and the coupling between the shear modes. With the aid of this representation, it is demonstrated that under a combination of outof-plane shear and extension along the fi bers there is a class of nonlinear materials for which the exact expression for the macroscopic behavior of a composite cylinder assemblage can be determined. The macroscopic response of the composite to shear in the transverse plane is approximated with the aid of an exact result for sequentially laminated composites. Assuming no coupling between the shear modes, these results allow to construct a closedform homogenized model for the macroscopic response of a fi ber composite with neo-Hookean phases. A new
variational estimate allows to extend these results to more general classes of materials. The resulting explicit estimates for the macroscopic stresses developing in composites and connective tissues with one and two families of fi bers are compared with corresponding fi nite element simulations of periodic composites and with experimental results. Estimates for the critical stretch ratios at which the composites loose stability at the macroscopic level are compared with the corresponding numerical results too. It is demonstrated that both the primary stress–strain curves and the critical stretch ratios are in fi ne agreement with the corresponding numerical results.
Original languageEnglish GB
StatePublished - 2014
EventSociety of Engineering Science 52st Annual Technical Meeting - Purdue University, West Lafayette, Indiana, United States
Duration: 1 Oct 20143 Oct 2014


ConferenceSociety of Engineering Science 52st Annual Technical Meeting
Country/TerritoryUnited States
City Indiana


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