scholarly journals Analysis of Bolt Joint Using the Finite Element Method

2010 ◽  
Vol 57 (3) ◽  
pp. 275-292 ◽  
Author(s):  
Bartłomiej Żyliński ◽  
Ryszard Buczkowski
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Nonlinear Stiffness ◽  
Computational Results ◽  
The Finite Element Method ◽  
Working Pressure ◽  
Joint Opening ◽  
Stiffness Characteristics ◽  
Isoparametric Finite Elements ◽  
Element Method

Analysis of Bolt Joint Using the Finite Element Method A numerical analysis of the initially clamped bolt joint subject to the working pressure is presented in the paper. Special, hexahedral 21- and 28-node isoparametric finite elements have been employed to model the contact zone. In this model, one takes into account loading due to the working pressure in the gap between the gasket and the flange arising as an effect of the progressing joint opening, what has not been considered in recent papers. Nonlinear stiffness characteristics of the bolt and the flange with the gasket are developed. Working pressure corresponding to the critical bolt force resulting in the joint leakage (complete opening between the gasket and the flange) is determined. FE computational results are compared with the available experimental results. The numerical results are presented using the authors' own graphical postprocessor.

ANALYTICAL AND NUMERICAL ANALYSIS OF FORCE AND STIFFNESS IN A DIAMAGNETIC BEARING

2009 ◽  
Vol 23 (23) ◽  
pp. 2763-2770 ◽  
Author(s):  
AHMET CANSIZ ◽  
UGUR CEM HASAR
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Levitation Force ◽  
Dipole Approximation ◽  
Mirror Image ◽  
Image Method ◽  
The Finite Element Method ◽  
Stiffness Characteristics ◽  
Ndfeb Permanent Magnet ◽  
Element Method

In this letter, a bearing consisting of a disk-shaped NdFeB permanent magnet levitated by a ferrite magnet with a diamagnetic stabilizer made of two bismuth blocks has been statically analyzed. The analysis, including levitation force and stiffness characteristics of this diamagnetic bearing, has been incorporated with the diamagnetic mirror image method based on the finite element and dipole approximation methods. Force equations of the levitated magnet are derived from the potential of the system in terms of magnetic, diamagnetic and gravitational interactions. The dipole approximation and finite element method were compared with each other. It is observed that while the dipole approximation (an analytical method) is successful in predicting the force and stiffness of the bearing, the finite element method, on the other hand, only estimates the levitation force. It is shown that the dipole approach has advantages over the finite element method for various perspectives such as calculation time and precision.

New construction of cycloidal gear unit made of plastics

2020 ◽  
pp. 095440622093999
Author(s):  
Krzysztof Biernacki
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Load Carrying Capacity ◽  
The Finite Element Method ◽  
Working Pressure ◽  
Maximum Value ◽  
Hydraulic Machines ◽  
Load Carrying ◽  
New Construction ◽  
Element Method

Cycloidal gears constitute the main working unit of the fluid power gerotor machine. The paper presents a way of increasing the load-carrying capacity of cycloidal unit made of plastic. The aim has been reached through design and material modifications. As a result of those modifications, a design concept of the cycloidal gear system, which is different from the structures previously produced, has been created. The introduced modifications are based on the theoretical analysis of stress and deformations that occur in cycloidal gears during their operation. The analysis was conducted by means of the finite element method. Although the main focus was on analyzing the mechanism behind the deformations, an attempt was also made at extending the application scope for finite element method. The analysis by means of finite element method has been conducted for plastic and steel at the same time. This is result of showed design in which plastics and steel form the construction together one integral part. As a result of the analysis, the maximum value of the working pressure at which hydraulic gerotor machines with plastic cycloidal gears can work was determined. Thanks to the use of the finite element method one can point out the way of introduction of plastics in hydraulic machines construction.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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