scholarly journals Analysis of the Biomechanical Behavior of the Intervertebral Discs by Modeling Three-Phase Finite Elements

2022 ◽  
Author(s):  
Filiz KARABUDAK ◽  
Hamid ZAMANLOU
Keyword(s):  
Finite Elements ◽  
Intervertebral Discs ◽  
Biomechanical Behavior ◽  
Three Phase

scholarly journals Finite element modeling of multiple density materials of bone specimens for biomechanical behavior evaluation

2021 ◽  
Vol 3 (9) ◽  
Author(s):  
Sebastián Irarrázaval ◽  
Jorge Andrés Ramos-Grez ◽  
Luis Ignacio Pérez ◽  
Pablo Besa ◽  
Angélica Ibáñez
Keyword(s):  
Finite Elements ◽  
Computational Models ◽  
Reaction Force ◽  
Elastic Stiffness ◽  
Finite Elements Method ◽  
Mechanical Resistance ◽  
Assessment Procedure ◽  
Axial Tomography ◽  
Biomechanical Behavior ◽  
Ct Data

AbstractThe finite elements method allied with the computerized axial tomography (CT) is a mathematical modeling technique that allows constructing computational models for bone specimens from CT data. The objective of this work was to compare the experimental biomechanical behavior by three-point bending tests of porcine femur specimens with different types of computational models generated through the finite elements’ method and a multiple density materials assignation scheme. Using five femur specimens, 25 scenarios were created with differing quantities of materials. This latter was applied to computational models and in bone specimens subjected to failure. Among the three main highlights found, first, the results evidenced high precision in predicting experimental reaction force versus displacement in the models with larger number of assigned materials, with maximal results being an R2 of 0.99 and a minimum root-mean-square error of 3.29%. Secondly, measured and computed elastic stiffness values follow same trend with regard to specimen mass, and the latter underestimates stiffness values a 6% in average. Third and final highlight, this model can precisely and non-invasively assess bone tissue mechanical resistance based on subject-specific CT data, particularly if specimen deformation values at fracture are considered as part of the assessment procedure.

scholarly journals Parameter Dependencies of a Biomechanical Cervical Spine FSU - The Process of Finding Optimal Model Parameters by Sensitivity Analysis

2021 ◽  
Author(s):  
Sabine Bauer ◽  
Ivanna Kramer
Keyword(s):  
Sensitivity Analysis ◽  
Intervertebral Discs ◽  
Model Parameters ◽  
Biomechanical Behavior ◽  
Functional Spinal Unit ◽  
Spine Model ◽  
Biomechanical Parameters ◽  
Multi Body ◽  
The Impact

The knowledge about the impact of structure-specific parameters on the biomechanical behavior of a computer model has an essential meaning for the realistic modeling and system improving. Especially the biomechanical parameters of the intervertebral discs, the ligamentous structures and the facet joints are seen in the literature as significant components of a spine model, which define the quality of the model. Therefore, it is important to understand how the variations of input parameters for these components affect the entire model and its individual structures. Sensitivity analysis can be used to gain the required knowledge about the correlation of the input and output variables in a complex spinal model. The present study analyses the influence of the biomechanical parameters of the intervertebral disc using different sensitivity analysis methods to optimize the spine model parameters. The analysis is performed with a multi-body simulation model of the cervical functional spinal unit C6-C7.

scholarly journals Calculations of Electrodynamic Forces in Three-Phase Asymmetric Busbar System with the Use of FEM

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5477
Author(s):  
Michał Szulborski ◽  
Sebastian Łapczyński ◽  
Łukasz Kolimas ◽  
Łukasz Kozarek ◽  
Desire Dauphin Rasolomampionona
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Elements ◽  
Mechanical Strength ◽  
Natural Frequency ◽  
Power Grid ◽  
Experimental Tests ◽  
Three Phase ◽  
Electrodynamic Forces ◽  
Selection Of

Proper busbar selection based on analytical calculations is of great importance in terms of power grid functioning and its safe usage. Experimental tests concerning busbars are very expensive and difficult to be executed. Therefore, the great advantage for setting the valid parameters for busbar systems components are analytical calculations supported by FEM (finite element method) modelling and analysis. Determining electrodynamic forces in busbar systems tends to be crucial with regard to subsidiary, dependent parameters. In this paper analytical calculations of asymmetric three-phase busbar system were carried out. Key parameters, like maximal electrodynamic forces value, mechanical strength value, busbar natural frequency, etc., were calculated. Calculations were conducted with an ANSYS model of a parallel asymmetric busbar system, which confirmed the obtained results. Moreover, showing that a model based on finite elements tends to be very helpful in the selection of unusually-shaped busbars in various electrotechnical applications, like switchgear.

Biomechanical behavior of human intervertebral discs subjected to long lasting axial loading

Biorheology ◽  
1984 ◽  
Vol 21 (5) ◽  
pp. 675-686 ◽  
Author(s):  
W. Koeller ◽  
F. Funke ◽  
F. Hartmann
Keyword(s):  
Axial Loading ◽  
Intervertebral Discs ◽  
Biomechanical Behavior

Design of Five-Phase Transformer through Finite Element Simulation

2015 ◽  
Vol 761 ◽  
pp. 12-16
Author(s):  
Kasrul Abdul Karim ◽  
Lim Geok Yin ◽  
Nor Azizah Mohd Yusoff ◽  
Md Nazri Othman ◽  
Auzani Jidin
Keyword(s):  
Finite Element ◽  
Finite Elements ◽  
Finite Element Simulation ◽  
Design Process ◽  
Phase Angle ◽  
Motor Drive ◽  
Diagram Method ◽  
Element Simulation ◽  
Three Phase ◽  
Simulation Results

The interests in multiphase (more than three) system are escalating recently especially in the motor drive applications. Thus, this paper introduces the graphical phasor diagram method in designing the multiphase transformer connection. The proposed method eases the design process of the static multiphase transformer that produces multiphase output from the standard three phase input. The transformer connection was simulated in ANSYS Maxwell and the multiphase waveform with appropriate phase angle was obtained. The design of five-phase transformer using graphical phasor and simulation results from the finite elements software are presented in this paper.

Methodology to Quantify Human Cervical Spine Uncovertebral Joint Anatomy

1997 ◽  
Vol 01 (02) ◽  
pp. 131-139 ◽  
Author(s):  
S. Kumaresan ◽  
N. Yoganandan ◽  
F. A. Pintar
Keyword(s):  
Cervical Spine ◽  
Three Dimensional ◽  
Spinal Column ◽  
Intervertebral Discs ◽  
Cervical Region ◽  
Finite Element Models ◽  
Adult Human ◽  
Biomechanical Behavior ◽  
The Mean ◽  
Uncovertebral Joint

The uncovertebral joints appear in the adult human cervical spinal column. While the descriptions of this structure have been reported, methods to quantify the dimensions of these joints are lacking. Therefore, in this study a preliminary attempt was made to develop a methodology to quantify the three-dimensional anatomical details of these joints in the adult human cervical spine using sequential cryomicrotome anatomic sections. Bilateral dorsal to ventral length, medial to lateral depth, and caudal to cranial height measurements were obtained from C2-T1 levels. The well developed larger joints were observed in the mid to lower cervical (C3-C7) regions and the smaller joints were noted in the most cranial and caudal (C2-C3, C7-T1) levels. Uncovertebral joints in the mid to lower cervical region extended further ventrally compared to the most cranial and caudal levels. The height of the uncovertebral joints was equal to the lateral height of the intervertebral discs throughout the extent of the joint. The mean overall medial to lateral depth of the joint was 3.8 mm (± 1.8). These quantitative three-dimensional descriptions assist in describing uncovertebral joints in stress analysis based finite element models to understand its effects on the cervical spine biomechanical behavior.

scholarly journals Biomechanical behavior of the dentoalveolar unit (UDA) of a central incisor under an orthodontic treatment, using wires of NiTi and NiTiCu: 3D simulation using finite elements

2019 ◽  
Vol 17 (3) ◽  
pp. 22
Author(s):  
Oscar Lopez R ◽  
Rafael Ortega ◽  
Daniel Pacheco ◽  
Jose Soler ◽  
Fernando Pantoja ◽  
...  
Keyword(s):  
Finite Elements ◽  
In Silico ◽  
Orthodontic Treatment ◽  
3D Simulation ◽  
Central Incisor ◽  
Biomechanical Behavior ◽  
Palabras Clave

Durante el tratamiento de ortodoncia se pueden encontrar diferentes patologías tanto a nivel periodontal como radicular, las cuales se pueden intensificar si no se utiliza la biomecánica adecuada. Los dispositivos ortodónticos pueden producir cargas de gran magnitud dentro de la UDA originando una oclusión vascular y un corte en el suministro de sangre al ligamento periodontal (LPD). En los tratamientos ortodónticos es común el uso de arcos manufacturados en Nitinol (NiTi) y NitiCopper (NiTiCu) como fuente de generación del estímulo mecánico para producir los movimientos ortodónticos. En esta investigación se determinó que tipo de material para el arco (NiTi o NiTiCu) proporciona una mejor relación entre el estímulo mecánico y la respuesta biológica de la UDA. Para esto, se desarrolló una experimentación in-silico mediante el uso de elementos finitos, modelando los arcos ortodónticos como un material con memoria de forma (SMA). El dominio de trabajo fue obtenido mediante tomografía computacional diferenciando cada uno de los tejidos presentes en la UDA; hueso trabecular y cortical, diente y LPD. Como resultado se obtuvo el comportamiento biomecánico de la UDA y el campo de esfuerzos producidos en el ligamento periodontal y el hueso alveolar, determinando que tipo de material para el arco de ortodoncia disminuye el riesgo de patologías o movimientos ortodónticos no deseados. Palabras clave: Biomecánica, Elementos finitos, ortodoncia.

scholarly journals Biomechanical behavior of an implant system of carbon fiber-reinforced polyether ether ketone (PEEK) bars with different designs: finite elements analysis

2019 ◽  
Vol 2 ◽  
pp. e201901003
Author(s):  
Didier ANZOLIN ◽  
Geraldo Alberto Pinheiro CARVALHO ◽  
Aline Batista Gonçalves FRANCO ◽  
Simone KREVE ◽  
Rafael Lacerda ZANDONÁ ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Finite Elements ◽  
Clinical Performance ◽  
Finite Elements Analysis ◽  
Biomechanical Behavior ◽  
Polyether Ether Ketone ◽  
New Material ◽  
Ether Ketone ◽  
Implant System ◽  
Shaped Section

We used finite elements analysis to assess the biomechanical behavior of lower protocol bars made of Polyether Ether Ketone (PEEK) reinforced by carbon fiber, with different designs on All-on-four® system, subjected to physiological occlusal loads. The models were built to have an I-shaped or an inverse T-shaped section. We also assessed the stress distribution on the peri implant bone, implants, prosthetic intermediates, prosthetic intermediate screws, and prosthetic screws. In the simulations, strength peaks were similar for both inverse T and I shaped models; however, the I-shaped bars showed larger resistance in comparison with the inverse T shape. Since it is a new material in dentistry, further research is necessary for a better assessment of PEEK's mechanical and clinical performance.

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