Conversion of irregular finite element grid data to regular grid for three-dimensional computer plotting

The paper considers the results of calculations of the axle of the wheel pair of apassenger car for strength and durability from fatigue. The loads acting on the axle of a passengercar during movement at the maximum permissible speed are determined.To solve the problems of studying the stress state of the axle of the passenger car at the firststage, a three-dimensional geometric model of the axis RU1 was developed. The most unfavorableload combination was taken into account in the calculation. The horizontal load was up to 10 kN.The load was applied to the axle necks, respectively, in the vertical and horizontal directions.The calculated model of the car axle RU1 is developed, on the basis of which the finiteelementmodel is created and the stress state of the wheel pair under the action of the main types ofload is investigated. The size of the finite element grid was chosen using a graphoanalytical methodand refined to a size of 2 mm. This feature of the finite element grid allowed to calculate thestresses in the calculated cross sections with greater accuracy and to determine the nature of thestress distribution.It is established that the maximum stresses arising in the axle of the passenger car under the most unfavorable work conditions that are concentrated in the filler in the zone oftransition from the neck to the pre-axle part.The axle was calculated for fatigue. Fatigue tests are usually performed at a uniaxial stressstate, so it is necessary to convert the multiaxial stress state to one scalar value to determine thenumber of cycles to failure at a given voltage amplitude. The load can occur with a constantamplitude.The number of load cycles that the car axle can withstand under operating loads isdetermined. According to the results of the research, restrictions on the service life of the axles ofwheel pairs of passenger cars are proposed.

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A three-dimensional, block-structured finite element grid generationscheme

AIAA Journal ◽

10.2514/3.9114 ◽

1985 ◽

Vol 23 (10) ◽

pp. 1483-1490 ◽

Cited By ~ 7

Author(s):

A. Ecer ◽

J. Spyropoulos ◽

J. D. Maul

Keyword(s):

Finite Element ◽

Three Dimensional ◽

Finite Element Grid ◽

Block Structured

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Procedure of the updated calculations of disks of aero – engines with removable blades a finite element method in three – dimensional statement in the environment of Femap/Nastran

Mechanics and Advanced Technologies ◽

10.20535/2521-1943.2021.5.1.226931 ◽

2021 ◽

Vol 5 (1) ◽

pp. 22-32

Author(s):

Konstantin Rudakov

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Three Dimensional ◽

Contact Forces ◽

Two Dimensional ◽

Finite Element Grid ◽

Operation Conditions ◽

Aero Engines ◽

Dimensional Statement ◽

Distribution Of Stresses

Problematic. At adaptation of a design of discs of rotor of air gas-turbine drives (GTD) it is necessary to conduct, in particular, strength calculations for what to create the computer models corresponding to stated designs (delineations) and operation conditions. If creation of a geometrical part of model does not call special difficulties the algorithm of creation of an is finite-element grid models for carrying out of calculations of performances of the disc stress-strain conditions (SSC) with blades can be modified taking into account development of programs for calculate. Research objective. To offer the algorithms allowing with the set exactitude to calculate performance of the SSC of discs with blades on personal computers, and also to represent outcomes in the form of schedules of type "surface". Realization technique. On an example of the disc of 2nd stage of the compressor of GTD the algorithm of construction of a three-dimensional is finite-element grid of the disc of GTD from the separate blocks which have been "pasted together" in a unified grid has been created. Numerical calculations (a contact problem of thermoelasticity, isotropic materials) are carried out. For preparation of construction of schedules of type "surface" the interface program of transformation of the table of columns in the two-dimensional table is created. The results of research. Are created and explicitly techniques of reaching of research objectives are described. Conclusions. The created techniques allow to carry out on the limited computer powers exact enough control calculations of discs with blades in three-dimensional statement, to conduct visualisation of distribution of stresses and contact forces of a zone of a contact "disc-blades" in the form of schedules of type "surface".

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Effects of occlusal scheme on All-on-Four abutments, screws and prostheses: A three-dimensional finite element study

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-19-00334 ◽

2020 ◽

Author(s):

Nurullah Türker ◽

Hümeyra Tercanlı Alkış ◽

Steven J Sadowsky ◽

Ulviye Şebnem Büyükkaplan

Keyword(s):

Finite Element ◽

Three Dimensional ◽

Good Prognosis ◽

Von Mises Stress ◽

Element Analysis ◽

Group Function ◽

Occlusal Contact ◽

Maximum Deformation ◽

Contact Points ◽

Von Mises

An ideal occlusal scheme plays an important role in a good prognosis of All-on-Four applications, as it does for other implant therapies, due to the potential impact of occlusal loads on implant prosthetic components. The aim of the present three-dimensional (3D) finite element analysis (FEA) study was to investigate the stresses on abutments, screws and prostheses that are generated by occlusal loads via different occlusal schemes in the All-on-Four concept. Three-dimensional models of the maxilla, mandible, implants, implant substructures and prostheses were designed according to the All-on-Four concept. Forces were applied from the occlusal contact points formed in maximum intercuspation and eccentric movements in canine guidance occlusion (CGO), group function occlusion (GFO) and lingualized occlusion (LO). The von Mises stress values for abutment and screws and deformation values for prostheses were obtained and results were evaluated comparatively. It was observed that the stresses on screws and abutments were more evenly distributed in GFO. Maximum deformation values for prosthesis were observed in the CFO model for lateral movement both in the maxilla and mandible. Within the limits of the present study, GFO may be suggested to reduce stresses on screws, abutments and prostheses in the All-on-Four concept.

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Comparison of Conventional and Pontic Fixed Partial Dentures Over Implants Using the Finite Element Method: Three-Dimensional Analysis of Cortical and Medullary Bone Stress

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-19-00115 ◽

2020 ◽

Vol 46 (3) ◽

pp. 175-181

Author(s):

Marcelo Bighetti Toniollo ◽

Mikaelly dos Santos Sá ◽

Fernanda Pereira Silva ◽

Giselle Rodrigues Reis ◽

Ana Paula Macedo ◽

...

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Three Dimensional ◽

The Finite Element Method ◽

Medullary Bone ◽

Principal Stresses ◽

Bone Stress ◽

Bone Damage ◽

Rehabilitation System ◽

Minimum Requirements

Rehabilitation with implant prostheses in posterior areas requires the maximum number of possible implants due to the greater masticatory load of the region. However, the necessary minimum requirements are not always present in full. This project analyzed the minimum principal stresses (TMiP, representative of the compressive stress) to the friable structures, specifically the vestibular face of the cortical bone and the vestibular and internal/lingual face of the medullary bone. The experimental groups were as follows: the regular splinted group (GR), with a conventional infrastructure on 3 regular-length Morse taper implants (4 × 11 mm); and the regular pontic group (GP), with a pontic infrastructure on 2 regular-length Morse taper implants (4 × 11 mm). The results showed that the TMiP of the cortical and medullary bones were greater for the GP in regions surrounding the implants (especially in the cervical and apical areas of the same region) but they did not reach bone damage levels, at least under the loads applied in this study. It was concluded that greater stress observed in the GP demonstrates greater fragility with this modality of rehabilitation; this should draw the professional's attention to possible biomechanical implications. Whenever possible, professionals should give preference to use of a greater number of implants in the rehabilitation system, with a focus on preserving the supporting tissue with the generation of less intense stresses.

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Towards Predicting Relative Belt Edge Endurance With the Finite Element Method

Tire Science and Technology ◽

10.2346/1.2141701 ◽

1990 ◽

Vol 18 (4) ◽

pp. 216-235 ◽

Cited By ~ 19

Author(s):

J. De Eskinazi ◽

K. Ishihara ◽

H. Volk ◽

T. C. Warholic

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Three Dimensional ◽

The Finite Element Method ◽

Shear Deformations ◽

Element Analysis ◽

Vertical Loading ◽

Predicted Values ◽

Element Method

Abstract The paper describes the intention of the authors to determine whether it is possible to predict relative belt edge endurance for radial passenger car tires using the finite element method. Three groups of tires with different belt edge configurations were tested on a fleet test in an attempt to validate predictions from the finite element results. A two-dimensional, axisymmetric finite element analysis was first used to determine if the results from such an analysis, with emphasis on the shear deformations between the belts, could be used to predict a relative ranking for belt edge endurance. It is shown that such an analysis can lead to erroneous conclusions. A three-dimensional analysis in which tires are modeled under free rotation and static vertical loading was performed next. This approach resulted in an improvement in the quality of the correlations. The differences in the predicted values of various stress analysis parameters for the three belt edge configurations are studied and their implication on predicting belt edge endurance is discussed.

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Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

Tire Science and Technology ◽

10.2346/1.2137526 ◽

1996 ◽

Vol 24 (4) ◽

pp. 339-348 ◽

Cited By ~ 3

Author(s):

R. M. V. Pidaparti

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Composite Structures ◽

Three Dimensional ◽

Element Model ◽

Torsional Stiffness ◽

Element Analysis ◽

Rubber Belt ◽

Steel Cord ◽

Torsional Analysis

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

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