Numerical analysis of a strain-adaptive bone remodelling problem

被引:22
|
作者
Fernandez, J. R. [1 ]
Garcia-Aznar, J. M. [2 ]
Martinez, R. [1 ]
Viano, J. M. [1 ]
机构
[1] Univ Santiago de Compostela, Dept Matemat Aplicada, Fac Matemat, Santiago De Compostela 15782, Spain
[2] Univ Zaragoza, Grp Struct Mech & Mat Modelling, Aragon Inst Engn Res I3A, E-50018 Zaragoza, Spain
关键词
Bone remodelling; Strain-adaptivity; Error estimates; Finite elements; Numerical simulations; ELASTIC ROD; MODEL; SIMULATION; UNIQUENESS; EXISTENCE; BEHAVIOR;
D O I
10.1016/j.cma.2010.01.005
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this paper we study from the numerical point of view a strain-adaptive bone remodelling that couples the displacements and the apparent density (the porosity) of the bone. The rate of this density at a particular location is described as an objective function, which depends on a particular stimulus at that location. The variational problem is written as a coupled system of a nonlinear variational equation for the displacement field and a nonlinear parabolic variational inequality for the apparent density. Then, fully discrete approximations are provided by using the finite element method to approximate the spatial variable and an Euler scheme to discretize the time derivatives. Error estimates are proved, from which, under adequate regularity conditions, the linear convergence of the algorithm is deduced. Finally, some numerical simulations involving one- and two-dimensional test examples are presented to demonstrate the accuracy of the approximation and the behaviour of the solution. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:1549 / 1557
页数:9
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