Analysis of the Local Deformations in Machine Joints

1979 ◽  
Vol 21 (1) ◽  
pp. 25-32 ◽  
Author(s):  
M. Burdekin ◽  
N. Back ◽  
A. Cowley
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Elements ◽  
Pressure Distribution ◽  
Surface Finish ◽  
The Finite Element Method ◽  
Theoretical Formulation ◽  
Apparent Area ◽  
Finish Material ◽  
General Method

This paper presents a general method for calculating the pressure distribution and the deformations in machine joints. This method assumes that the components of the joint are connected through finite elements which are defined as a function of the surface finish, material and pressure at the apparent area of contact. The system so established is solved in an iterative manner using the finite-element method, obtaining, as a final result, the pressure distribution at the contacting surfaces of the components and the deformations of the surrounding body. To prove the validity and precision of the theoretical formulation, several examples of joints are considered where the correlation between the calculated and measured deflections is shown to be good.

scholarly journals Non-linearity of the contact layer between elements joined in a multi-bolted connection and the preload of the bolts

2016 ◽  
Vol 165 (2) ◽  
pp. 3-8
Author(s):  
Rafał GRZEJDA
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Elements ◽  
Cylinder Head ◽  
Contact Layer ◽  
Rigid Support ◽  
The Finite Element Method ◽  
Bolted Connection ◽  
Winkler Model ◽  
Engine Cylinder

The paper presents modeling and calculations of multi-bolted connections at the assembly stage on an example of the engine cylinder head-block connection. The physical model of the connection was introduced as a combination of three subsystems: the set of bolts, the joined element and the contact layer between the joined element and the rigid support. The finite element method (FEM) was used for the modeling. Bolts were replaced with hybrid elements. The joined element was modeled with spatial finite elements. The Winkler model of the contact layer has been taken into consideration. The truth of the theorem has been examined, according to which non-linearity of the contact layer has a negligible impact on the final values of the bolt forces in the case of sequential preloading of the multi-bolted connection. The results of the calculations of a selected multi-bolted connection have been compared with the experimental results.

Teaching Electromagnetics through Finite Elements. Part I: The Rationale

1988 ◽  
Vol 25 (1) ◽  
pp. 33-49 ◽  
Author(s):  
S. Ratnajeevan H. Hoole
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Elements ◽  
Special Solution ◽  
The Finite Element Method ◽  
Solution Methods ◽  
Element Method

The rationale for teaching undergraduate electromagnetics partly through the finite element method, is put forward. Properly presented, the finite element method, easily within the ken of the engineering undergraduate, promotes clarity and helps to replace large portions of syllabi devoted to special solution methods, with problems of industrial magnitude and character.

scholarly journals Analysis of pressure distribution in the foot using finite elements

2020 ◽  
Vol 14 (2) ◽  
pp. 197-200
Author(s):  
Carlos Alberto Costa ◽  
Vinicius Victorazzi Lain ◽  
Alexandre Leme Godoy-Santos ◽  
Victor Gonçalvez de Antoni ◽  
Paulo Roberto Linzmaier ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Pressure Distribution ◽  
The Finite Element Method ◽  
Level Of Evidence ◽  
Healthy Human ◽  
Element Analysis ◽  
Human Foot ◽  
Biomechanical Behavior ◽  
Element Method

The objective of this study is to evaluate the applicability of the finite element method to analyze pressure distribution in the healthy human foot. Images of a foot were captured using computed tomography and converted into a three-dimensional model, which was adjusted with the aid of CAD software. The model was imported into Abaqus software for finite element analysis, considering the different regions of the foot. Observations of displacement, stresses, and pressure distribution demonstrated a biomechanical behavior of the foot consistent with that reported in the existing literature, regarding the regions of peak plantar pressure. These findings demonstrate the feasibility of evaluating the physical and mechanical behavior of the human foot using the finite element method, and can serve as a reference for the study and manufacture of orthotic appliances, prosthetic devices, and insoles. Level of Evidence V; Prognostic Studies; Expert Opinion.

HIGHER-ORDER MASS-LUMPED FINITE ELEMENTS FOR THE WAVE EQUATION

2001 ◽  
Vol 09 (02) ◽  
pp. 671-680 ◽  
Author(s):  
W. A. MULDER
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Wave Propagation ◽  
Wave Equation ◽  
Finite Elements ◽  
Finite Difference Method ◽  
Seismic Wave Propagation ◽  
The Finite Element Method ◽  
Efficient Scheme ◽  
The Finite Difference Method

The finite-element method (FEM) with mass lumping is an efficient scheme for modeling seismic wave propagation in the subsurface, especially in the presence of sharp velocity contrasts and rough topography. A number of numerical simulations for triangles are presented to illustrate the strength of the method. A comparison to the finite-difference method shows that the added complexity of the FEM is amply compensated by its superior accuracy, making the FEM the more efficient approach.

A Numerical Solution of the Elastohydrodynamic Lubrication Problem Using Finite Elements

1972 ◽  
Vol 14 (4) ◽  
pp. 229-237 ◽  
Author(s):  
C. Taylor ◽  
J. F. O'Callaghan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Elements ◽  
Numerical Solution ◽  
Elastohydrodynamic Lubrication ◽  
The Finite Element Method ◽  
Galerkin Approach ◽  
Recent Developments ◽  
Element Method ◽  
Isoparametric Elements

This paper comprises a report on recent developments in the application of the finite element method in the analysis of elastohydrodynamic lubrication (e.h.l.) problems. The basic formulation is effected, using the Galerkin approach and the domain under investigation is discretized using isoparametric elements. The techniques used to locate the inlet and outlet boundaries and those employed during successive iterations are illustrated by application to particular examples.

scholarly journals 10.36.910. RESEARCHING OF DETAIL’S CONSTRUCTION WITH METHOD OF FINAL ELEMENTAL ANALYSIS

2019 ◽  
pp. 46-51
Author(s):  
O.V. Voloshko Assistant, S. P. Vysloukh Ph.D. Assoc. Prof.
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Elements ◽  
Computer Modelling ◽  
Elastic State ◽  
The Finite Element Method ◽  
Software Environment ◽  
Element Analysis ◽  
Deformed State

The advantages of using computer modelling for the study of the detail’s elastic-deformed state during the process of its operation are given. It is proposed to use the method of finite elements for such researches. It is shown that FEMAP is an effective software environment based on finite element analysis. An example of using the finite element method for modelling the detail’s elastic state operating in conditions of alternating loads is given. Наведено переваги використання комп’ютерного моделювання для дослідження пружно-деформований стан деталі в процесі її експлуатації. Запропоновано для таких досліджень використовувати метод скінченних елементів. Показано, що ефективним програмним середовищем, яке базується на кінцево-елементному аналізі, є система FEMAP. Наведена приклад використання методу скінченних елементів для моделювання пружного стану деталі, що працює в умовах знакозмінних навантажень.

scholarly journals The study of the lifting mechanism of the crane arm to a barge

2020 ◽  
Vol 2 (1) ◽  
pp. 91-96
Author(s):  
C. Fratila ◽  
T. Axinte ◽  
R. C. Cojocaru ◽  
C. Berescu ◽  
I.C. Scurtu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fatigue Life ◽  
Finite Elements ◽  
Safety Factor ◽  
The Finite Element Method ◽  
Ship Owner ◽  
Loading And Unloading ◽  
Lifting Equipment ◽  
Boom Crane

During cargo loading and unloading, the vessels’ lifting gear, even if anchored or moored, is affected by the pitch and roll movements, in addition to the usual stresses, a similar shore crane is subjected to. This paper aims at presenting an analysis of the lifting operations of a boom crane pertaining to a self-propelled barge. The analysis starts with the meshing with triangle elements, the stresses and the embedding using the finite elements method. The crane and the pertaining boom were modeled using CAD design, NX 10.0 from Siemens. The lifting equipment of the ships boom crane may be subject to dangerous defects occurring during the loading and unloading process. Subsequently, the research emphasizes the stresses occurred in the piston rod and in the eye of the lifting equipment, using the finite element method (FEM). After the stress analysis, several fatigue matters are studied: fatigue safety factor, fatigue life, strength safety factor and crack. The damaging or breaking of the eye or of the piston rod from the lifting equipment of the ships boom crane is leading to the blocking of the cylinder with the result of unfavorable events, such as deformation of the boom crane, damaging the loads and even the danger of sinking the barge. The results of this analysis provide ship-owner and maintenance engineers a useful tool to take appropriate decision during inspection of the lifting gear of the ship, prior commencement of the loading and unloading operations.

scholarly journals Photoelastic and Finite Element Stress Analysis of the Gap between the L4 and L5 Vertebrae

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Sarah Fakher Fakhouri ◽  
Suraya Gomes Novais-Shimano ◽  
Marcos Massao Shimano ◽  
Helton Defino ◽  
Cleudmar Amaral Araujo ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Elements ◽  
Intervertebral Disc ◽  
Stress Analysis ◽  
Disc Degeneration ◽  
Compressive Load ◽  
The Finite Element Method ◽  
Finite Element Stress Analysis ◽  
Transmission Technique

The purpose of this study was to analyze the stresses on the intervertebral disc between vertebrae L4 and L5 when a compressive load is applied on vertebra L4 using the photoelasticity transmission technique and the finite element method. Nine photoelastic models were used and were divided into three groups. Each group was formed by three models, according to the localization of the sagittal cut on vertebrae L4-L5. Simulation was carried out using a load of 23 N. The fringe orders were assessed by points close to the edge of the intervertebral disc using the Tardy compensation method. The analyses using the photoelasticity technique and the model of the finite elements showed that the stress generated by the vertebrae on the intervertebral disc was higher in the posterolateral region. Thus, this region is more susceptible to pathologies such as hernia and disc degeneration.

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