FINITE ELEMENT ANALYSIS OF A DEVICE FOR ALVEOLAR OSTEOGENIC DISTRACTION IN HUMAN MANDIBLE

2015 ◽  
Vol 27 (04) ◽  
pp. 1550034
Author(s):  
M. Cerrolaza ◽  
W. Carrero ◽  
J. Cedeño ◽  
L. Valencia
Keyword(s):  
Finite Element ◽  
Alveolar Bone ◽  
Involuntary Movement ◽  
Fem Analysis ◽  
Base Plate ◽  
Element Model ◽  
Critical Conditions ◽  
Element Analysis ◽  
Bone Deficiency ◽  
Bone Segment

Distractor devices are implanted temporarily in the bony structure in order to regenerate the bone tissue required and then be removed from the distraction site at the end of the consolidation period of callus. In this research, an osteogenic alveolar distractor (OAD) to deal with jaw bone deficiency in the alveolar area is proposed and described in this study. It addresses the FEM analysis of the proposed model of an OAD under physiological loading after the implantation. A finite element model subjected to physiological load exerted by the voluntary protrusion of the tongue on the alveolar distractor was analyzed and developed. The applied biological loads were the forces generated by the involuntary movement of the tongue against the distal end of the assembly. Both of them act on the head of the distractor screw, in the same direction but in opposite directions. The distraction device has been simulated on the alveolar bone, taking into account the most critical conditions that may occur during the distraction osteogenesis. The alveolar distractor proposed has a geometry that allows, by using only two intra-cortical screws, the attachment of the base plate to the alveolar bone without sacrificing a large periosteum area of the periosteum, which is primarily responsible for blood supply and nutrient source to the bone segment being distracted. The resulting stresses were lower than those corresponding to the resistance threshold in the bone.

Finite Element Analysis of the Distributed Vibration Absorbers for Structural Noise Control

2005 ◽  
Author(s):  
Ashwini Gautam ◽  
Chris Fuller ◽  
James Carneal
Keyword(s):  
Finite Element ◽  
Numerical Model ◽  
Base Plate ◽  
Element Model ◽  
Fe Model ◽  
Vibration Absorbers ◽  
Element Analysis ◽  
Poroelastic Media ◽  
Hexahedral Elements ◽  
Component Models

This work presents an extensive analysis of the properties of distributed vibration absorbers (DVAs) and their effectiveness in controlling the sound radiation from the base structure. The DVA acts as a distributed mass absorber consisting of a thin metal sheet covering a layer of acoustic foam (porous media) that behaves like a distributed spring-mass-damper system. To assess the effectiveness of these DVAs in controlling the vibration of the base structures (plate) a detailed finite elements model has been developed for the DVA and base plate structure. The foam was modeled as a poroelastic media using 8 node hexahedral elements. The structural (plate) domain was modeled using 16 degree of freedom plate elements. Each of the finite element models have been validated by comparing the numerical results with the available analytical and experimental results. These component models were combined to model the DVA. Preliminary experiments conducted on the DVAs have shown an excellent agreement between the results obtained from the numerical model of the DVA and from the experiments. The component models and the DVA model were then combined into a larger FE model comprised of a base plate with the DVA treatment on its surface. The results from the simulation of this numerical model have shown that there has been a significant reduction in the vibration levels of the base plate due to DVA treatment on it. It has been shown from this work that the inclusion of the DVAs on the base plate reduces their vibration response and therefore the radiated noise. Moreover, the detailed development of the finite element model for the foam has provided us with the capability to analyze the physics behind the behavior of the distributed vibration absorbers (DVAs) and to develop more optimized designs for the same.

scholarly journals A finite element analysis for a comparative evaluation of stress with two commonly used esthetic posts

2013 ◽  
Vol 07 (04) ◽  
pp. 419-422 ◽  
Author(s):  
Prajna P. Shetty ◽  
Roseline Meshramkar ◽  
Konark N. Patil ◽  
Ramesh K. Nadiger
Keyword(s):  
Finite Element ◽  
Glass Fibre ◽  
Elastic Moduli ◽  
Alveolar Bone ◽  
Element Model ◽  
Endodontically Treated Teeth ◽  
Element Analysis ◽  
Tooth Structure ◽  
Homogenous Distribution ◽  
Distribution Of Stress

ABSTRACT Objectives:The objective of this study was to evaluate stress distribution in the dentin and alveolar bone created by load application on simulated endodontically treated teeth with two different esthetic posts. Materials and Methods: A finite element model was made and elastic moduli and poissons ratio of all the materials fed to the software. For both the models, a 100N force was applied on the lingual surface of the tooth at an angle of 45°. Stress concentration and distribution were evaluated and noted down for both the posts. Results: Finite element method revealed that Glass fibre post had homogenous distribution of stress whereas in zirconia post the stress was concentrated in the post.Conclusion :The present findings suggest that glass fibre post should be used in well-conserved radicular tooth structure and Zirconia post is indicated in weakened and grossly destructed tooth structure.

A Study Effect of Shooting 2 Balls in a Ball Swaging Process on Gram Load Parameter Using Finite Element Analysis

2014 ◽  
Vol 1061-1062 ◽  
pp. 421-426 ◽  
Author(s):  
Panupich Kheunkhieo ◽  
Kiatfa Tangchaichit
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Radial Direction ◽  
Base Plate ◽  
Element Model ◽  
Load Parameter ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Main Component

The purposes of this research are to explore the baseplate and actuator arm deformation which effect to the gram load which occur in the ball swaging process, the main component determining quality of assembly the head stack assembly with the actuator arm. By shooting a ball though the base plate, the component located on the head stack assembly, the base plate plastic deformation takes place and it in expand in radial direction. The base plate then adjoins with the actuator arm. Using the finite element method to reproduce the ball swaging process, we repeated to study effect of the swage press clamp and velocity. The study done by creating the three dimensionals finite element model to analyze and explain characteristics of the baseplate and actuator arm deformation which effect to gram load which effect to the ball swaging process.

FEM Analysis of a 0.50 Caliber Rifle Barrel

2010 ◽  
Author(s):  
Gary A. Anderson ◽  
Corey M. Lanoue ◽  
Fereidoon Delfanian
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
Leading Edge ◽  
Fem Analysis ◽  
High Strength ◽  
Element Model ◽  
Pressure Profile ◽  
Strength Analysis ◽  
Analysis Tool ◽  
Element Analysis

In order to ensure rifle barrels have the features of high strength, durability, and light weight, the strength analysis of the barrels under hot temperatures and pressures is very important in the design. A finite element model incorporating the plastic deformation of a typical 0.50 caliber rifle barrel is constructed to determine the stresses caused by the mechanical loads and plastic deformation. According to the simulation results, the finite element analysis is proved to be a power analysis tool for future failure analysis of firearm barrels. The method provides a power tool for analysis of firearm barrels. The projectile was accelerated to 941.7 m/s in 1.430 ms with a pressure profile that reached a maximum of 469.3 MPa. Stresses as large as 1,410 MPa along the interior of the barrel were found where the leading edge of the projectile slides along the bore, but the largest stresses at the exterior of the barrel were found where the barrel wall is thinnest near the chamber.

scholarly journals Evaluation of the Effect of Complete and Partial Osseointegration in Stress Development at Bone-Implant Interface: A 3D Finite Element Study

2016 ◽  
Vol 6 (2) ◽  
pp. 24-27
Author(s):  
Bashu Raj Pandey ◽  
Hemant Kumar Halwai ◽  
Khushbu Adhikari ◽  
Amresh Thakur
Keyword(s):  
Finite Element ◽  
Cortical Bone ◽  
Cancellous Bone ◽  
Element Model ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Bone Implant ◽  
Stress Development ◽  
Bone Segment ◽  
Von Mises

Introduction: Mini-implant has been in use as temporary anchorage device in orthodontics. Various factors like length, type of osseointegration, magnitude and direction of force, insertion angle of the mini-implant affect the stress development at the bone and implant interface. Development of undesirable stress at the bone-implant interface can lead to bone defect and failure of the implant. Various opinions regarding the need of osseointegration have been reported.Objective: To study the effect of complete and partial osseointegration on Von Mises stress distribution at the bone-implant interface.Materials & Method: Finite element model of 9mm × 1.5mm mini-implant and bone segment of 1.5mm were constructed to simulate the biomechanical response of the bone to the mini- implant by using CATIA V5-6R 2013 software. Stress developed on implant and bone were analyzed by using ANSYS: 13 2013 version software for both complete and partial level of osseointegration.Result: Maximum Von Mises stress in complete osseointegration was 14.49 Mpa in cortical bone, 0.551 Mpa in cancellous bone and 50.76 Mpa in implant. In partial osseointegration, it was 18.68 Mpa in cortical bone, 1.23 Mpa in cancellous bone and 66.80 Mpa in mini-implant.Conclusion: In partial osseointegration, stress developed was higher but well below the yield strength of respected continuum. So the partial osseointegration is a good compromise between the necessity of reducing mobility of implant and the necessity for easier screw removal. Key words: cancellous bone, cortical bone, Finite element analysis, mini-implant, Von Mises stress

Parametric Study of Swage Ball for Hard Disk Drive Swaging Process Using Finite Element Method

2013 ◽  
Vol 275-277 ◽  
pp. 2241-2247 ◽  
Author(s):  
Arbtip Dheeravongkit ◽  
Narongsak Tirasuntarakul
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
Base Plate ◽  
Disk Drive ◽  
Element Model ◽  
Complex Problem ◽  
Design Parameters ◽  
Element Analysis ◽  
Element Method

Ball swaging is a general method in head stack assembly process to permanently attach Head Gimbal Assemblies (HGA) on the actuator arm. In this process, the swage ball is guided by a pin through the inner base plate’s hole in order to deform the base plate to tightly attach to the actuator arm. However, the loosing problem can still be found quite often in the current swaging process. This research focuses on ball sizes and the number of balls used which currently no theoretical guidance in choosing the both parameters. Besides, the best combination of the both parameters can give the best swaging performance. The three-dimensional finite element model is created and analyzed to estimate the swaging performance according to the variation of both parameters by using the tightening torque and the fixing distance of base plate to determine the quality of the ball swaging process. The results from finite element method are treated as the sampling points which are used to create the interpolation in order to increase the considered cases to cover all happening cases from both parameters. After that, a searching algorithm is implemented to determine the most suitable ball size and the number of ball used for the process. By using the finite element analysis together with the interpolation and a searching algorithm, the optimal design parameters for a complex problem with multiple conditions of consideration can be easily found.

Stress Distribution on Short Implants at Maxillary Posterior Alveolar Bone Model With Different Bone-to-Implant Contact Ratio: Finite Element Analysis

2016 ◽  
Vol 42 (1) ◽  
pp. 26-33 ◽  
Author(s):  
Duygu Yazicioglu ◽  
Burak Bayram ◽  
Yener Oguz ◽  
Duygu Cinar ◽  
Sina Uckan
Keyword(s):  
Finite Element ◽  
Dental Implants ◽  
Cancellous Bone ◽  
Alveolar Bone ◽  
Contact Ratio ◽  
Element Analysis ◽  
Contact Group ◽  
Bone Segment ◽  
Posterior Maxilla ◽  
Bone To Implant Contact

The aim of this study was to evaluate the stress distribution of the short dental implants and bone-to-implant contact ratios in the posterior maxilla using 3-dimensional (3D) finite element models. Two different 3D maxillary posterior bone segments were modeled. Group 1 was composed of a bone segment consisting of cortical bone and type IV cancellous bone with 100% bone-to-implant contact. Group 2 was composed of a bone segment consisting of cortical bone and type IV cancellous bone including spherical bone design and homogenous tubular hollow spaced structures with 30% spherical porosities and 70% bone-to-implant contact ratio. Four-millimeter-diameter and 5-mm-height dental implants were assumed to be osseointegrated and placed at the center of the segments. Lateral occlusal bite force (300 N) was applied at a 25° inclination to the implants long axis. The maximum von Mises stresses in cortical and cancellous bones and implant-abutment complex were calculated. The von Mises stress values on the implants and the cancellous bone around the implants of the 70% bone-to-implant contact group were almost 3 times higher compared with the values of the 100% bone-to-implant contact group. For clinical reality, use of the 70% model for finite element analysis simulation of the posterior maxilla region better represents real alveolar bone and the increased stress and strain distributions evaluated on the cortical and cancellous bone around the dental implants.

FEM Analysis and Optimization of Large Load Suspended Platform

2012 ◽  
Vol 569 ◽  
pp. 415-419
Author(s):  
Xi Jian Zheng ◽  
Yong Shang Han ◽  
Zheng Yi Xie
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
Fem Analysis ◽  
Element Model ◽  
Test Results ◽  
The Finite Element Method ◽  
Element Analysis ◽  
The Finite Element Model

Based on the Finite Element Method, the suspended platform of temporarily installed suspended access equipment was simplified and the special connection positions were dealt with rigidization and coupling, thus the finite element model of suspended platform was established. Analyzing major structures of finite element model in different section dimensions, the reasonable scheme could be ascertained and the section dimensions of major structures in different materials could be obtained. Combining with the test results, the rationality of finite element analysis could be proved. The study could provide reference for the similar products on design and development.

scholarly journals Fixation Methods for Mandibular Advancement and Their Effects on Temporomandibular Joint: A Finite Element Analysis Study

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Sabit Demircan ◽  
Erdoğan Utku Uretürk ◽  
Ayşegül Apaydın ◽  
Sinan Şen
Keyword(s):  
Finite Element ◽  
Temporomandibular Joint ◽  
Three Dimensional ◽  
Element Model ◽  
Mandibular Advancement ◽  
Element Analysis ◽  
Bone Fixation ◽  
Dentofacial Deformities ◽  
Bone Segment ◽  
Fixation Screw

Objectives. Bilateral sagittal split osteotomy (BSSO) is a common surgical procedure to correct dentofacial deformities that involve the mandible. Usually bicortical bone fixation screw or miniplates with monocortical bone fixation screw were used to gain stability after BSSO. On the other hand, the use of resorbable screw materials had been reported. In this study, our aim is to determine first stress distribution values at the temporomandibular joint (TMJ) and second displacement amounts of each mandibular bone segment. Methods. A three-dimensional virtual mesh model of the mandible was constructed. Then, BSSO with 9 mm advancement was simulated using the finite element model (FEM). Fixation between each mandibular segment was also virtually performed using seven different combinations of fixation materials, as follows: miniplate only (M), miniplate and a titanium bicortical bone fixation screw (H), miniplate and a resorbable bicortical bone fixation screw (HR), 3 L-shaped titanium bicortical bone fixation screws (L), 3 L-shaped resorbable bicortical bone fixation screws (LR), 3 inverted L-shaped titanium bicortical bone fixation screws (IL), and 3 inverted L-shaped resorbable bicortical bone fixation screws (ILR). Results. At 9 mm advancement, the biggest stress values at the anterior area TMJ was seen at M fixation and LR fixation at posterior TMJ. The minimum stress values on anterior TMJ were seen at L fixation and M fixation at posterior TMJ. Minimum displacement was seen in IL method. It was followed by L, H, HR, M, ILR, and LR, respectively. Conclusion. According to our results, bicortical screw fixation was associated with more stress on the condyle. In terms of total stress value, especially LR and ILR lead to higher amounts.

Parameter studies and verifications on three-dimensional finite element analysis of rigid pavements

2004 ◽  
Vol 31 (5) ◽  
pp. 782-796 ◽  
Author(s):  
Ying-Haur Lee ◽  
Hsin-Ta Wu ◽  
Shao-Tang Yen
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Fem Analysis ◽  
Element Model ◽  
Prediction Equation ◽  
Element Analysis ◽  
Dimensionless Variable ◽  
Shell Elements ◽  
Rigid Pavements ◽  
Element Selection

The main objective of this study was to conduct in-depth parameter studies and verifications on three-dimensional (3-D) finite element (FEM) analysis of rigid pavements. A systematic analytical approach was utilized and implemented in a Visual Basic software package to study the effects of mesh fineness and element selection. The deflection and stress convergence characteristics of various 3-D shell and solid elements were investigated. Several guidelines in mesh fineness and element selection were developed and recommended. Using the principles of dimensional analysis, an additional dimensionless variable (h/a, where h is the thickness of the slab and a is the radius of the applied load) was identified and verified to have a substantial influence on ABAQUS runs using either 3-D shell elements or 3-D solid elements. Separate 3-D FEM stress and deflection databases were developed using all dimensionless variables. An example critical stress predictive model was developed. Together with the existing two-dimensional FEM research findings, a tentative stress prediction equation was proposed to illustrate its possible applications.Key words: rigid pavement, finite element model, stress, deflection, design, evaluation.

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