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In practice, we found that while the intra-ensemble form first r. From the resulting CFA information, 25 × 25 mm test specimens exhibiting a high degree of structural uniformity suitable for biaxial testing were selected. We ignore any time-dependent effects, as we have found that native and cross-linked valvular tissues exhibit minimal time-dependent effects [ 57 — 60 ]. While at first glance this appears to be a major nonlinear optimization undertaking with all the usual pitfalls, we can use the following sequence to make actual parameter estimation quite tractable:. Finite element implementation of a generalized Fung-elastic constitutive model for planar soft tissues.

Plausibility of structural constitutive-equations for isotropic soft-tissues in finite static deformations. The results for the ensemble stress suggest that the interaction terms are exponential in character figure 8. Limitations and future directions The current model is limited in the fact that it is quasi-static and does not account for permanent set phenomena we have observed se mer 71 ]. This test design allowed a comprehensive planar mechanical behaviour dataset to be collected on matched native and EXL specimens, compensating for inter-specimen variations. Final parameter values for the full model equation 5.

Support Center Support Center. Final parameter values for the full model equation 5. Further, six of the 13 fibrils showed linear behaviour. One advantage of our approach is that the various contributions to the total stress can be separated figure 8. All specimens exhibited anisotropic dimensional changes due to preconditioning and cross-linking figure 3 b.

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