Interrelation of Creep and Relaxation : A Modeling Approach for Ligaments  

Oleh:

Vanderby, R. ; Lakes, R. S.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Biomechanical Engineering vol. 121 no. 6 (1999), page 612-615.
Topik: RELAXATION; interrelation; creep; relaxation; ligaments

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ52.1 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Experimental data (Thornton et al., 1997) show that relaxation proceeds more rapidly (a greater slope on a log - log scale) than creep in ligament, a fact not explained by linear viscoelasticity. An interrelation between creep and relaxation is therefore developed for ligaments based on a single - integral nonlinear superposition model. This interrelation differs from the convolution relation obtained by Laplace transforms for linear materials. We demonstrate via continuum concepts of non linear viscoelasticity that such a difference in rate between creep and relaxation phenomenologically occurs when the nonlinearity is of a strain - stiffening type, i. e., the stress - strain curve is concave up as observed in ligament. We also show that it is inconsistent to assume a Fung - type constitutive law (Fung, 1972) for both creep and relaxation. Using the published data of Thornton et al. (1997), the non linear interrelation developed herein predicts creep behaviour from relaxation data well (R >= 0.998). Although data are limited and the causal mechanisms associated with viscoelastic tissue behaviour are complex, continuum concepts demonstrated here appear capable of interrelating creep and relaxation with fidelity.

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