Biphasic Poroviscoelastic Simulation of The Unconfined Compression of Articular Cartilage : II-Effect of Variable Strain Rates  

Oleh:

Zhu, Qilliang ; Suh, Jun-Kyo Francis ; DiSilvestro, Mark R.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Biomechanical Engineering vol. 123 no. 2 (2001), page 198-200.
Topik: variable; biphasis; poroviscoelastic; simulation; articular cartilage; variable; strain rates

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ52.2 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

This study investigated the abilities of the linear biphasic poroviscoelastic (BPVE) model and the linear biphasic poroelastic (BPE) model to simulate the effect of variable ramp strain rates on the unconfined compression stress relaxation response of articular cartilage. Curve fitting of experimental data showed that the BPVE model was able to successfully account for the ramp strain rate - dependent viscoelastic behavior of articular cartilage under unconfined compression, while the BPE model was able to account for the complete viscoelastic response at a slow strain rate, but only the long - term viscoelastic response at faster strain rates. We concluded that the short - term viscoelastic behaviour of articular cartilage, when subjected to a fast ramp strain rate, is primarily governed by a fluid flow - independent (intrinsic) viscoelastic mechanism, whereas the long - term viscoelastic behaviour is governed by a fluid flow - dependent (biphasic) viscoelastic mechanism. Furthermore, a linear viscoelastic representation of the solid stress was found to be a valid model assumption for the simulation of ramp strain rate - dependent relaxation behaviours of articular cartilage within the range of ramp strain rates investigated.

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