scholarly journals A Comparative 3D Finite Element Computational Study of Three Connections

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3135 ◽  
Author(s):  
Davide Farronato ◽  
Mattia Manfredini ◽  
Andrea Stevanello ◽  
Veronica Campana ◽  
Lorenzo Azzi ◽  
...  
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Computational Study ◽  
Critical Role ◽  
Three Dimensional ◽  
Fem Analysis ◽  
Element Model ◽  
Homogeneous Pattern ◽  
Connection Design ◽  
Internal Screw

Masticatory overload on dental implants is one of the causes of marginal bone resorption. The implant–abutment connection (IAC) design plays a critical role in the quality of the stress distribution, and, over the years, different designs were proposed. This study aimed to assess the mechanical behavior of three different types of IAC using a finite element model (FEM) analysis. Three types of two-piece implants were designed: two internal conical connection designs (models A and B) and one internal flat-to-flat connection design (model C). This three-dimensional analysis evaluated the response to static forces on the three models. The strain map, stress analysis, and safety factor were assessed by means of the FEM examination. The FEM analysis indicated that forces are transmitted on the abutment and implant’s neck in model B. In models A and C, forces were distributed along the internal screw, abutment areas, and implant’s neck. The stress distribution in model B showed a more homogeneous pattern, such that the peak forces were reduced. The conical shape of the head of the internal screw in model B seems to have a keystone role in transferring the forces at the surrounding structures. Further experiments should be carried out in order to confirm the present suppositions.

Effect of Friction on Residual Stress Distribution Induced by Split Sleeve Cold Expansion Process

2020 ◽  
Author(s):  
Mithun K. Dey ◽  
Dave Kim ◽  
Hua Tan
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stress Distribution ◽  
Compressive Residual Stress ◽  
Three Dimensional ◽  
Element Model ◽  
Residual Stress Distribution ◽  
Expansion Process ◽  
Cold Expansion ◽  
Three Dimensional Finite Element

Abstract Residual Stress distribution and parametric influence of friction are studied for the split sleeve cold expanded holes in Al 2024 T351 alloy, by developing a three-dimensional finite element model of the process. Fastener holes in the alloy are necessary for the manufacturing process, but they create a potential area for stress concentration, which eventually leads to fatigue under cyclic loading. Beneficial compressive residual stress distribution as a result of the split sleeve cold expansion process provides retardation against crack initiation and propagation at the critical zones near hole edges. In this parametric study, the influence of friction between contact surfaces of the split sleeve and mandrel is numerically investigated. Hole reaming process after split sleeve cold expansion is often not discussed. Without this post-processing procedure, split sleeve cold expansion is incomplete in practice, and its purpose of providing better fatigue performance is invalidated. This study presents results and an overview of the significance of friction with the consideration of the postprocessing of split sleeve cold expansion. The numerical results show that with increasing friction coefficient, compressive residual stress reduces significantly at the mandrel entry side, which makes the hole edge more vulnerable to fatigue. The different aspects of finite element modeling approaches are also discussed to present the accuracy of the prediction. Experimental residual stress observation or visual validation is expensive and time-consuming. So better numerical prediction with the transparency of the analysis design can provide critical information on the process.

A Study on Construction Three-Dimensional Nonlinear Finite Element Model and Stress Distribution Analysis of Anterior Cruciate Ligament

2009 ◽  
Vol 131 (12) ◽  
Author(s):  
Feng Xie ◽  
Liu Yang ◽  
Lin Guo ◽  
Zhi-jun Wang ◽  
Gang Dai
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Knee Joint ◽  
Finite Element Model ◽  
Laser Scanning ◽  
Cruciate Ligament ◽  
Three Dimensional ◽  
Element Model ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

To establish a finite element model that reflects the geometric characteristics of the normal anterior cruciate ligament (ACL), explore the approaches to model knee joint ligaments and analyze the mechanics of the model. A healthy knee joint specimen was subjected to three-dimensional laser scanning, and then a three-dimensional finite element model for the normal ACL was established using three-dimensional finite element software. Based on the model, the loads of the ACL were simulated to analyze the stress-strain relationship and stress distribution of the ACL. Using the ABAQUS software, a three-dimensional finite element model was established. The whole model contained 22,125 nodes and 46,411 units. In terms of geometric similarity and mesh precision, this model was superior to previous finite element models for the ACL. Through the introduction of material properties, boundary conditions, and loads, finite elements were analyzed and computed successfully. The relationship between overall nodal forces and the displacement of the ACL under anterior loads of the tibia was determined. In addition, the nephogram of the ACL stress spatial distribution was obtained. A vivid, three-dimensional model of the knee joint was established rapidly by using reverse engineering technology and laser scanning. The three-dimensional finite element method can be used for the ACL biomechanics research. The method accurately simulated the ACL stress distribution with the tibia under anterior loads, and the computational results were of clinical significance.

scholarly journals Extruded upper first molar intrusion: Comparison between unilateral and bilateral miniscrew anchorage

2018 ◽  
Vol 23 (1) ◽  
pp. 63-70 ◽  
Author(s):  
Mari Miura Sugii ◽  
Bruno de Castro Ferreira Barreto ◽  
Waldemir Francisco Vieira-Júnior ◽  
Katia Regina Izola Simone ◽  
Ataís Bacchi ◽  
...  
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Alveolar Bone ◽  
Three Dimensional ◽  
Root Apex ◽  
Element Model ◽  
Lower Probability ◽  
Dimensional Finite Element ◽  
Homogeneous Stress ◽  
Three Dimensional Finite Element

ABSTRACT Objective: The aim of his study was to evaluate the stress on tooth and alveolar bone caused by orthodontic intrusion forces in a supraerupted upper molar, by using a three-dimensional Finite Element Method (FEM). Methods: A superior maxillary segment was modeled in the software SolidWorks 2010 (SolidWorks Corporation, Waltham, MA, USA) containing: cortical and cancellous bone, supraerupted first molar, periodontal tissue and orthodontic components. A finite element model has simulated intrusion forces of 4N onto a tooth, directed to different mini-screw locations. Three different intrusion mechanics vectors were simulated: anchoring on a buccal mini-implant; anchoring on a palatal mini-implant and the association of both anchorage systems. All analyses were performed considering the minimum principal stress and total deformation. Qualitative analyses exhibited stress distribution by color maps. Quantitative analysis was performed with a specific software for reading and solving numerical equations (ANSYS Workbench 14, Ansys, Canonsburg, Pennsylvania, USA). Results: Intrusion forces applied from both sides (buccal and palatal) resulted in a more homogeneous stress distribution; no high peak of stress was detected and it has allowed a vertical resultant movement. Buccal or palatal single-sided forces resulted in concentrated stress zones with higher values and tooth tipping to respective force side. Conclusion: Unilateral forces promoted higher stress in root apex and higher dental tipping. The bilateral forces promoted better distribution without evidence of dental tipping. Bilateral intrusion technique suggested lower probability of root apex resorption.

Finite Element Analysis for the Mega Columns for XRL West Kowloon Terminus

2013 ◽  
Vol 405-408 ◽  
pp. 1139-1143
Author(s):  
Wei Su ◽  
Ying Sun ◽  
Shi Qing Huang ◽  
Ren Huai Liu
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Parametric Design ◽  
Three Dimensional ◽  
Element Model ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Von Mises ◽  
Three Dimensional Finite Element

Using ANSYS parametric design language, a three-dimensional finite element model is developed to analyze the stress distribution and the strength of the mega columns for XRL West Kowloon Terminus. The detailed von Mises stress distribution in each column, vertical stiffener plates and the diaphragm plates is obtained. From the analysis, the phenomenon of stress concentration is obvious in both upper and lower diaphragm plates. The local value of von Mises stress in them is higher than the yield stress value, which must be avoided by more detailed local structural design.

Investigation into the Effect of the Nut Thread Run-Out on the Stress Distribution in a Bolt Using the Finite Element Method

2003 ◽  
Vol 125 (3) ◽  
pp. 527-532 ◽  
Author(s):  
J. W. Hobbs ◽  
R. L. Burguete ◽  
E. A. Patterson
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Distribution ◽  
Three Dimensional ◽  
Element Model ◽  
Two Dimensional ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Dimensional Models ◽  
Three Dimensional Models

By means of comparing results from finite element analysis and photoelasticity, the salient characteristics of a finite element model of a nut and bolt have been established. A number of two-dimensional and three-dimensional models were created with varying levels of complexity, and the results were compared with photoelastic results. It was found that both two-dimensional and three-dimensional models could produce accurate results provided the nut thread run-out and friction were modeled accurately. When using two-dimensional models, a number of models representing different positions around the helix of the thread were created to obtain more data for the stress distribution. This approach was found to work well and to be economical.

Mechanics Characteristics of Expressway Tunnel Through Fault Fracture Zone at the Entrance

2012 ◽  
Vol 256-259 ◽  
pp. 1296-1302 ◽  
Author(s):  
Yong Fang ◽  
Ge Cui ◽  
Bin Yang ◽  
Ya Peng Fu
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Finite Element Model ◽  
Fracture Zone ◽  
Three Dimensional ◽  
Longitudinal Direction ◽  
Element Model ◽  
Internal Force ◽  
Fault Fracture Zone ◽  
Primary Support

Guandoushan tunnel in the Yibin - Luzhou expressway passes through fault fracture zone at the entrance. Structure internal force are complex during or after the construction. It challenges the safety during construction and operation. Plane finite element model was used to calculate internal force of primary support in the cases of different buried depths and three dimensional finite element model was applied to calculate stress distribution of primary support and secondary lining of the tunnel through fault fracture zone. The results indicate: with the increasing of buried depth, the loads acting on the structure will increase. It leads to uneven stress distribution in longitudinal direction, especially in the border of fault zone. It is suggested to increase the longitudinal reinforcement to improve overall longitudinal shearing resistance capacity and set deformation joint in the intersection to strengthen the longitudinal deformation ability of structure.

scholarly journals Effect of Riveting Angle and Direction on Fatigue Performance of Riveted Lap Joints

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 236
Author(s):  
Qingxiao Liang ◽  
Tianpeng Zhang ◽  
Chunrun Zhu ◽  
Yunbo Bi
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Fatigue Tests ◽  
Lap Joints ◽  
Fatigue Performance ◽  
Riveting Process ◽  
Three Dimensional Finite Element

Riveting is the most commonly used connection method in aircraft assembly, and its quality has a crucial effect on the fatigue performance of aircraft. Many factors affect the riveting quality, among which the influence of the riveting angle and direction is not clear. In this paper, a three-dimensional finite element model of single-rivet lap joints is established and verified by the driven head geometry and the riveting force data obtained from the riveting experiments. Then, by adjusting the angle and direction of the punch in the finite element model, the riveting process is simulated at the angles of 0°, 1°, 2°, and 3° and the directions of 0° and 180° to investigate the deformation of the lap joints, the stress distribution around the hole, and the stress distribution of the rivet. Finally, the fatigue tests of the single-rivet lap joints are performed and the influence of the riveting angle and direction on the connection quality and fatigue performance of the riveting joints is analyzed.

Study of Stress Distribution for Ceramic Materials in Human Denture by 3D Finite Element Model

2014 ◽  
Vol 1044-1045 ◽  
pp. 100-103
Author(s):  
Zhi Hong Dong ◽  
Chang Chun Zhou
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
New Technology ◽  
Three Dimensional ◽  
Element Model ◽  
Ceramic Materials ◽  
3D Design ◽  
Element Analysis ◽  
Optical Scanner ◽  
Cad Cam

Teeth is the most hard tissue in human body, and its component contains over 96 wt.% inorganic mineral. When the teeth were destroyed by chewing, whiten, etched and friction, etc., ceramic materials are one of the most widely used materials for dental defect repairing or replacement [1-3]. Stress distribution of teeth is necessary to evaluate due to bearing the heavier load, especially the mandibular first molar. But its structure is so complex as not to measure the stress distribution accurately. With the development of CAD/CAM technology, some new technology and equipments occurrence may supply for good methods to evaluate the characteristics of complex structures [4-7]. Since Farah introduced a finite element analysis method into the field of oral medicine in 1973, the method was widely used to research the teeth mechanics, which is most suitable and efficient tools compared with other technologies [8]. In this paper, molar stress distributions were analyzed. By three-dimensional optical scanner and computer 3D design software such as solidworks, Geomagic Studio, CATIA V5, a molar model was built with accuracy and effectiveness, further the mechanical properties of ceramics denture was achieved.

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