A Comparison of Analysis Flywheel Stress Distributions Based on Different Material

2014 ◽  
Vol 536-537 ◽  
pp. 1291-1294 ◽  
Author(s):  
Hong Liang Chen ◽  
Chang Sheng Zhu ◽  
Peng Ye
Keyword(s):  
Finite Element Analysis ◽  
Energy Storage ◽  
Three Dimensional ◽  
Stress Distributions ◽  
High Output Power ◽  
Element Analysis ◽  
Composite Flywheel ◽  
Storage And Retrieval ◽  
Storage Technologies ◽  
High Output

Flywheels serve as kinetic energy storage and retrieval devices with the ability to deliver high output power at high rotational speeds as being one of the emerging energy storage technologies available today in various stages of development. This article analyzes the three-dimensional stress distribution of flywheel in Finite-element analysis. It is compared flywheel made of different material to meet the design of reasonable safety composite flywheel.

scholarly journals Comparison of Tooth- and Bone-Borne Appliances on the Stress Distributions and Displacement Patterns in the Facial Skeleton in Surgically Assisted Rapid Maxillary Expansion—A Finite Element Analysis (FEA) Study

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1152
Author(s):  
Rafał Nowak ◽  
Anna Olejnik ◽  
Hanna Gerber ◽  
Roman Frątczak ◽  
Ewa Zawiślak
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Rapid Maxillary Expansion ◽  
Stress Distributions ◽  
Maxillary Expansion ◽  
Facial Skeleton ◽  
Element Analysis ◽  
Maxillary Constriction

The aim of this study was to compare the reduced stresses according to Huber’s hypothesis and the displacement pattern in the region of the facial skeleton using a tooth- or bone-borne appliance in surgically assisted rapid maxillary expansion (SARME). In the current literature, the lack of updated reports about biomechanical effects in bone-borne appliances used in SARME is noticeable. Finite element analysis (FEA) was used for this study. Six facial skeleton models were created, five with various variants of osteotomy and one without osteotomy. Two different appliances for maxillary expansion were used for each model. The three-dimensional (3D) model of the facial skeleton was created on the basis of spiral computed tomography (CT) scans of a 32-year-old patient with maxillary constriction. The finite element model was built using ANSYS 15.0 software, in which the computations were carried out. Stress distributions and displacement values along the 3D axes were found for each osteotomy variant with the expansion of the tooth- and the bone-borne devices at a level of 0.5 mm. The investigation showed that in the case of a full osteotomy of the maxilla, as described by Bell and Epker in 1976, the method of fixing the appliance for maxillary expansion had no impact on the distribution of the reduced stresses according to Huber’s hypothesis in the facial skeleton. In the case of the bone-borne appliance, the load on the teeth, which may lead to periodontal and orthodontic complications, was eliminated. In the case of a full osteotomy of the maxilla, displacements in the buccolingual direction for all the variables of the bone-borne appliance were slightly bigger than for the tooth-borne appliance.

Pre-Collapse Stress Redistributions in Femoral Head Osteonecrosis—A Three-Dimensional Finite Element Analysis

1983 ◽  
Vol 105 (2) ◽  
pp. 171-176 ◽  
Author(s):  
T. D. Brown ◽  
G. L. Hild
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Stress Distributions ◽  
Element Analysis ◽  
Strong Function ◽  
Apparent Modulus ◽  
Femoral Head Osteonecrosis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Three-dimensional finite element analysis is used to explore the influence of several lesion characteristics upon mechanical stress distributions in segmentally necrotic human femoral heads. Variables studied parametrically included apparent modulus deficits within the lesion proper, as well as the depth, width, and location of the infarcted head regions. The detailed patterns of stress redistribution were complex and were found to be a strong function of the specific lesion characteristics. The salient phenomenon, however, was one of preferential load uptake by the stiffer bone surrounding the lesion. Since computed stress reductions within the infarctions were usually much smaller than experimentally observed strength reductions, the data suggest a strong tendency for an elevated incidence of trabecular fatigue fractures in the affected regions.

scholarly journals Evaluation of stress distributions in peri-implant and periodontal bone tissues in 3- and 5-unit tooth and implant-supported fixed zirconia restorations by finite elements analysis

2015 ◽  
Vol 09 (03) ◽  
pp. 329-339 ◽  
Author(s):  
Sedat Guven ◽  
Koksal Beydemir ◽  
Serkan Dundar ◽  
Veysel Eratilla
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Stress Distributions ◽  
Finite Elements Analysis ◽  
Element Analysis ◽  
3D Finite Element ◽  
Cervical Portion ◽  
Distribution Of Stress ◽  
Stress Accumulation

ABSTRACT Objective: In this study, it is aimed to compare the distribution of stress on periodontal and peri-implant bone tissues in 3- and 5-unit-dental and implant-supported zirconia restorations using finite element analysis. Materials and Methods: Stress distribution formed in periodontal and peri-implant bone tissues as a result of chewing forces was analyzed in dental and implant-supported three-dimensional (3D) finite element models of zirconia restoration with 5-unit placed on the numbers of 43, 44, 45, 46, and 47 and with 3-unit placed on the number of 45, 46, and 47. Four different loading conditions were used. 200 N force was applied in 30° from the buccal inclination of number 43, 45, and 47 restorations separately and totally 850 N force was applied in 30° from the buccal inclination of whole restoration. The study was performed through static nonlinear analysis with the 3D finite element analysis method. Results: Stress accumulation in bone tissues in the tooth-supported model was found less than in implant-supported models. Stress accumulation was observed in the cervical portion of the implant in implant-supported models, and stress accumulation was observed surrounding bone of roots in tooth-supported models. The highest stress values were occurred in 5 unit implant-supported model in all loadings. Conclusion: In posterior restorations increased in the number of supported teeth and implant can reduce the destructive forces on periodontal and peri-implant bone tissues and may allow longer period retention of the restorations in the mouth.

scholarly journals Evaluation of the Ko-Len Model for Enterlaminar Stresses in Composite Laminates with an Open Hole

1996 ◽  
Vol 5 (5) ◽  
pp. 096369359600500 ◽  
Author(s):  
F. Z. Hu ◽  
C. Soutis
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Composite Laminates ◽  
Three Dimensional ◽  
Tensile Loading ◽  
Stress Distributions ◽  
Element Analysis ◽  
Open Hole ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

The purpose of this paper is to evaluate a recently developed analytical model [1] which determines the interlaminar stress distributions around a circular hole in symmetric composite laminates under in-plane tensile loading. For this purpose, a three-dimensional finite element analysis is performed and the stress distributions for symmetric cross-ply laminates are presented This work is relevant to the prediction of delamination onset load and location around the discontinuity.

Shape and cost analysis of pressurized fabric structures for subsea compressed air energy storage

2011 ◽  
Vol 225 (5) ◽  
pp. 1027-1043 ◽  
Author(s):  
A J Pimm ◽  
S D Garvey ◽  
R J Drew
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Energy Storage ◽  
Three Dimensional ◽  
Compressed Air ◽  
Compressed Air Energy Storage ◽  
Element Analysis ◽  
Cost Of Energy ◽  
The Cost ◽  
Fabric Structures

In this article, three different methods are presented for finding the deformed shape of pressurized fabric structures underwater. The methods are used here to analyse the shape and cost of ‘energy bags’, inflatable bags that can be anchored to the seabed and used for subsea compressed air energy storage. First, a system of coupled ordinary differential equations is derived which can be solved to find the shape of an inextensible axisymmetric membrane. Then finite-element analysis (FEA) of an axisymmetric natural shape bag is carried out using cable elements, giving the deformed shape of an extensible axisymmetric membrane. Finally, a full three-dimensional FEA is presented which includes cable and membrane elements. A simple optimization is also used to minimize the cost per unit of energy stored in an axisymmetric natural shape energy bag, and it is shown that if only materials costs are taken into account, the cost of surface is approximately equal to the cost of meridional reinforcement in the optimum-sized bag.

About the Influence of the Corrosion Defect Geometry on Repaired Pipes Stress Distribution

2020 ◽  
Vol 143 (1) ◽  
Author(s):  
Ionut Lambrescu ◽  
Alin Dinita ◽  
Mihail Minescu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Surface Defects ◽  
Three Dimensional ◽  
Stress Distributions ◽  
Pipe Axis ◽  
Element Analysis ◽  
New Approach ◽  
Defect Area ◽  
Different Shapes

Abstract This paper proposes a new approach in dealing with volumetric surface defects (VSD) in pipelines. Using three-dimensional (3D) scanning and reverse engineering techniques, along with finite element analysis, we studied and evaluated comparatively the stress distributions in the defect area for different shapes and positions of the machined VSD, in order to find the best solution for the repairing process using composite materials. Our main conclusion is that instead of machining the VSD such as to generate a rectangular shaped machined defect, with edges parallel/perpendicular to the pipe axis, it is better to mold the VSD. Another possible solution would be to machine the real VSD such as to generate an inclined rectangle that circumscribes the defect. This paper also studies the influence of the machined defect filet radius to the bottom of the VSD.

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