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Bone Stress-Strain State Evaluation Using CT Based FEM

Authors :
Oleg V. Gerasimov
Nikita V. Kharin
Artur O. Fedyanin
Pavel V. Bolshakov
Maxim E. Baltin
Evgeny O. Statsenko
Filip O. Fadeev
Rustem R. Islamov
Tatyana V. Baltina
Oskar A. Sachenkov
Source :
Frontiers in Mechanical Engineering, Vol 7 (2021)
Publication Year :
2021
Publisher :
Frontiers Media S.A., 2021.

Abstract

Nowadays, the use of a digital prototype in numerical modeling is one of the main approaches to calculating the elements of an inhomogeneous structure under the influence of external forces. The article considers a finite element analysis method based on computed tomography data. The calculations used a three-dimensional isoparametric finite element of a continuous medium developed by the authors with a linear approximation, based on weighted integration of the local stiffness matrix. The purpose of this study is to describe a general algorithm for constructing a numerical model that allows static calculation of objects with a porous structure according to its computed tomography data. Numerical modeling was carried out using kinematic boundary conditions. To evaluate the results obtained, computational and postprocessor grids were introduced. The qualitative assessment of the modeling data was based on the normalized error. Three-point bending of bone specimens of the pig forelimbs was considered as a model problem. The numerical simulation results were compared with the data obtained from a physical experiment. The relative error ranged from 3 to 15%, and the crack location, determined by the physical experiment, corresponded to the area where the ultimate strength values were exceeded, determined by numerical modeling. The results obtained reflect not only the effectiveness of the proposed approach, but also the agreement with experimental data. This method turned out to be relatively non-resource-intensive and time-efficient.

Details

Language :
English
ISSN :
22973079
Volume :
7
Database :
Directory of Open Access Journals
Journal :
Frontiers in Mechanical Engineering
Publication Type :
Academic Journal
Accession number :
edsdoj.3ddf0194efb7407587214a44d415df49
Document Type :
article
Full Text :
https://doi.org/10.3389/fmech.2021.688474