On prediction of the compressive strength and failure patterns of human vertebrae using a quasi-brittle continuum damage finite element model - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Acta of Bioengineering and Biomechanics Année : 2019

On prediction of the compressive strength and failure patterns of human vertebrae using a quasi-brittle continuum damage finite element model

Résumé

Purpose: Damage of bone structures is mainly conditioned by bone quality related to the bone strength. The purpose of this work was to present a simple and reliable numerical treatment of a quasi-brittle damage constitutive model coupled with two different elastic modulus and to compare the numerical results with the experimental ones. Methods: To achieve this goal, a QCT based finite element model was developed within the framework of CDM (Continuum Damage Mechanics) and implemented in the FE code (ABAQUS). It described the propagation of brittle cracks which will help to predict the ultimate load fracture of a human vertebra by reproducing the experimental failure under quasi-static compressive loading paths of nineteen cadaveric lumbar vertebral bodies. Results: The numerical computations delivered by the proposed method showed a better agreement with the available experimental results when bone volume fraction related Young's modulus (E(BV/TV)) is used instead of density related Young's modulus (E(ρ)). Also, the study showed that the maximum relative error (%) in failure was 8.47% when E(BV/TV) is used, whereas the highest relative error (%) was 68.56% when E(ρ) is adopted. Finally, a mesh sensitivity analysis revealed that the element size has a weak incidence on the computed load magnitude. Conclusions: The numerical results provided by the proposed quasi-brittle damage model combined with E(BV/TV) are a reliable tool for the vertebrae fracture prediction.
Fichier principal
Vignette du fichier
fafa_hal.pdf (1.36 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02114927 , version 1 (30-04-2019)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

Citer

Zahira Nakhli, Fafa Ben Hatira, Martine Pithioux, Patrick Chabrand, Khemais Saanouni. On prediction of the compressive strength and failure patterns of human vertebrae using a quasi-brittle continuum damage finite element model. Acta of Bioengineering and Biomechanics, 2019, 21 (2), pp.143-151. ⟨10.5277/ABB-01265-2019-03⟩. ⟨hal-02114927⟩
130 Consultations
261 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More