Locally orthotropic femur model

Pálfi, Péter (2004) Locally orthotropic femur model. JOURNAL OF COMPUTATIONAL AND APPLIED MECHANICS, 5 (1). pp. 103-115. ISSN 1586-2070

Preview

Text 5-1-PalfiPeter-V5N1HomePage.pdf - Published Version Download (563kB) | Preview

Abstract

The ability of spongy bone, which specifies the direction of trabeculae to be parallel to the local principal stress directions is called, Wolff's law [1]. Based on this statement we can create a simple mode using an easy iterative method which is called locally orthotropic femur model [2]. The gist of the iteration is the following: in an FE model according to the actual loading, first the material directions are engaged to be parallel to the calculated principal stress for every element, then the principal stress directions are calculated again and the material directions are modified. (The initial material orientations are parallel to each other, or random.) The obtained iterative method is strongly convergent, after six iteration loops the material angles do not change more than a few tenths and after the fifteenth iteration are practically constant. Therefore the advantages of this iterative method are its speed, effectiveness and similarity to real bone's trabeculae structure. We are planning to extend the 2D model to 3D, or rather to use the model obtained to the validation process of femur prosthesis.

Actions (login required)

Edit Item