関節軟骨の押し込み影響因子と粘弾性パラメータ

概要

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The indentation influence factors of human articular cartilage are investigated using the mechanical testing and finite element analysis. Viscoelastic behavior of the articular cartilage is measured by newly indentation apparatus having a circular plane-ended indenter. The viscoelastic parameters are estimated by applying the nonlinear least squares method (Gauss-Newton method) to creep curves obtained from the indentation tests. Three element solid model is finely approximated a viscoelastic characteristics of the articular cartilage. The viscoelastic parameters increased extremely with a decrease of indenter radius. These phenomena are explained by a stress analyses using the linear FEM for an axially-symmetric contact problem. Furthermore, the applicability of this inverse analytics to such indentation problem is discussed. It is shown that the indenter radius and applying load being suitable to physiologically reasonable levels of human articular geometry are 1mm and 4.9N, respectively.
東海大学の論文