Estimation of in Situ Elastic Properties of Biphasic Cartilage Based on A Transversely Isotropic Hypo-Elastic Model  

Oleh:

Altiero, N. J. ; Haut, R. C. ; Garcia, J. J.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Biomechanical Engineering vol. 122 no. 1 (2000), page 1-8.
Topik: Isotropic; estimation; in situ elastic; biphasic cartilage; isotropic; hypo - elastic; model

Ketersediaan

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

Lihat Detail Induk

Isi artikel

Articular cartilage is known to behave nonlinearly for large deformations. Mechanical properties derived from small strain experiments yield excessively large deformations in finite element models used in the study of severe blunt impact to joints. In this manuscript, a method is presented to determine the nonlinear elastic properties of biphasic cartilage based on a transversely isotropic hypo - elastic model. The elastic properties were estimated by fitting two force -d isplacement curves (in rapid loading and at equilibrium) obtained from large deformation indentation relaxation tests on cartilage using a non porous spherical indentor. The solid skeleton of the cartilage was modeled as a transversely isotropic hypo - elastic material and a commercial finite element program was employed to solve the problem of a layer indented by a rigid sphere. Components of the hypo - elasticity tensor were made dependent on deformation according to the variations defined by a transversely isotropic hyperelastic formulation given earlier by others. Material incompressibility was assumed during the initial stage of rapid loading. The analysis was utilized for the determination of in situ properties of rabbit retropatellar cartilage at large deformations. The model was able to fit the material response to rapid loading and equilibrium indentation test data to approximately 50 percent strain. This material model suggested even higher percentage of stress supported by the fluid phase of cartilage than given earlier by small deformation theories of biphasic cartilage.

Opini Anda

Klik untuk menuliskan opini Anda tentang koleksi ini!

Kembali