Linear and nonlinear analyses of femoral fractures: Computational/experimental study
| Autor: | Pegah Amiri, Fatemeh Alavi, Vahid Naeini, Majid Mirzaei, Farzaneh Allaveisi |
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| Rok vydání: | 2018 |
| Předmět: |
Male
0301 basic medicine Materials science Adolescent Finite Element Analysis 0206 medical engineering Biomedical Engineering Biophysics 02 engineering and technology Young Adult 03 medical and health sciences medicine Humans Subtrochanteric Fractures Orthopedics and Sports Medicine Quantitative computed tomography medicine.diagnostic_test business.industry Rehabilitation Structural engineering Bone fracture medicine.disease 020601 biomedical engineering Finite element method Nonlinear system Cohesive zone model 030104 developmental biology Nonlinear Dynamics Crack initiation Linear Models Tomography X-Ray Computed business Material properties Femoral Fractures |
| Zdroj: | Journal of Biomechanics. 79:155-163 |
| ISSN: | 0021-9290 |
| DOI: | 10.1016/j.jbiomech.2018.08.003 |
| Popis: | This paper describes two new methods for computational fracture analysis of human femur using Quantitative Computed Tomography (QCT) voxel-based finite element (FE) simulation. The paper also reports comprehensive mechanical testing for validation of the methods and evaluation of the required material properties. The analyses and tests were carried out on 15 human femurs under 11 different stance-type loading orientations. Several classical forms of subcapital, transcervical, basicervical, and intertrochanteric fractures plus a specific type of subtrochanteric fracture were created and analyzed. A new procedure was developed for prediction of the strengths and the fracture initiation patterns using a FE-based linear scheme. The predicted and observed fracture patterns were in correspondence, and the FE predictions of the fracture loads were in very good agreement with the experimental results. Moreover, the crack initiation and growth behaviors of two subtrochanteric fractures were successfully simulated through a novel implementation of the cohesive zone model (CZM) within a nonlinear FE analysis scheme. The CZM parameters were obtained through a series of experimental tests on different types of specimens and determination of a variety of material properties for different anatomic regions and orientations. The presented results indicated that the locations and patterns of crack initiation, the sequences of crack growth on different paths, and the compatibility of growth increments agreed very well with the observed specifications. Also, very good agreements were achieved between the measured and simulated fracture loads. |
| Databáze: | OpenAIRE |
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