Optimal internal architectures of femoral bone based on relaxation by homogenization and isotropic material design

I. Goda, , J.F. Ganghoffe , Sławomir Adam Czarnecki , Paweł Wawruch , Tomasz Denis Lewiński

Abstract

The influence of the loading conditions on the trabecular architecture of a femur is investigated by using topology optimization methods. The response of the bone to physiological loads results in changes of the internal architecture of bone, reflected by a modification of internal effective density and mechanical properties. The homogenization based optimization model is developed for predicting optimal bone density distribution, wherein bone tissue is assumed to be a composite material consisting of a mixture of material and void. The homogenization scheme treats the geometric parameters of the microstructures and their orientation as design variables and homogenizes the properties in that microstructure, which is generally anisotropic. The penalization of the optimal material density then leads to a classical optimal structure which consists of regions with bone material and regions without bone material. The IMD (Isotropic Material Design) approach is next applied to determine the optimal elasticity tensor in terms of the bulk and shear moduli for the present loading applied to the femoral bone sample. IMD is able to provide both the external shape and topology together with the optimal layout of the isotropic moduli. Both topology optimization methods appear to be complementary. Simulations of the internal bone architecture of the human proximal femur results in a density distribution pattern with good consistency with that of the real bone
Author I. Goda,
I. Goda,,,
-
, J.F. Ganghoffe
J.F. Ganghoffe,,
-
, Sławomir Adam Czarnecki IIB
Sławomir Adam Czarnecki,,
- The Institute of Civil Engineering
, Paweł Wawruch WIL
Paweł Wawruch,,
- Faculty of Civil Engineering
, Tomasz Denis Lewiński IIB
Tomasz Denis Lewiński,,
- The Institute of Civil Engineering
Journal seriesMechanics Research Communications, ISSN 0093-6413
Issue year2016
Vol76
Pages64-71
Publication size in sheets0.5
Keywords in English Topology optimization; Relaxation by homogenization; FE simulations; Free material design; Femoral bone
DOIDOI:10.1016/j.mechrescom.2016.06.007
Languageen angielski
File
optimal integral.pdf (file archived - login or check accessibility on faculty) optimal integral.pdf 1.25 MB
Score (nominal)30
ScoreMinisterial score = 25.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 30.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 1.667 (2) - 2016=1.854 (5)
Citation count*5 (2018-02-23)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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