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Structural Engineering and Mechanics
  Volume 72, Number 2, October25 2019, pages 191-201
DOI: http://dx.doi.org/10.12989/sem.2019.72.2.191
 


Femoral Fracture load and damage localization pattern prediction based on a quasi-brittle law
Zahira Nakhli, Fafa Ben Hatira and Martine Pithioux, Patrick Chabrand and Khemais Saanouni

 
Abstract
    Finite element analysis is one of the most used tools for studying femoral neck fracture. Nerveless, consensus concerning either the choice of material characteristics, damage law and /or geometric models (linear on nonlinear) remains unreached. In this work, we propose a numerical quasi-brittle damage model to describe the behavior of the proximal femur associated with two methods to evaluate the Young modulus. Eight proximal femur finite elements models were constructed from CT scan data (4 donors: 3 women; 1 man). The numerical computations showed a good agreement between the numerical curves (load – displacement) and the experimental ones. A very encouraging result is obtained when a comparison is made between the computed fracture loads and the experimental ones (R2=0.825, Relative error =6.49%). All specific numerical computation provided very fair qualitative matches with the fracture patterns for the sideway fall simulation. Finally, the comparative study based on 32 simulations adopting linear and nonlinear meshing led to the conclusion that the quantitatively results are improved when a nonlinear mesh is used.
 
Key Words
    Sideway fall, proximal femur fracture, quasi-brittle damage, finite element analysis, fracture pattern, non-linear meshing
 
Address
Zahira Nakhli/Laboratoire de Recherche Matériaux Mesures et Application
Fafa Ben Hatir/Laboratoire de Recherche Matériaux Mesures et Application
Martine Pithioux/Aix Marseille University
Patrick Chabrand/Aix Marseille University
Khemais Saanouni/Laboratoire des Systèmes Mécaniques et d
 

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