scholarly journals The Guidelines for Modelling the Preloading Bolts in the Structural Connection Using Finite Element Methods

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Paulina Krolo ◽  
Davor Grandić ◽  
Mladen Bulić
Keyword(s):  
Finite Element ◽  
Numerical Models ◽  
Bolted Joints ◽  
Body Motion ◽  
Contact Method ◽  
The Finite Element Method ◽  
Advantages And Disadvantages ◽  
Negative Eigenvalues ◽  
Extended End Plate ◽  
Structural Connection

The aim of this paper is the development of the two different numerical techniques for the preloading of bolts by the finite element method using the software Abaqus Standard. Furthermore, this paper gave detailed guidelines for modelling contact, method for solving the numerical error problems such as numerical singularity error and negative eigenvalues due to rigid body motion or the problem of the extensive elongation of bolts after pretension which is occurring during the analysis. The behaviour of bolted joints depending on the two different approaches of pretension was shown on the example of an extended end-plate bolted beam-to-column connection under the monotonic loading. The behaviour of beam-to-column connection was shown in the form and moment-rotation (M-ϕ) curves and validated by experimental test. Advantages and disadvantages of pretension techniques, as well as the speed of numerical models, were also presented in this paper.

Numerical Simulation of Self-Loosening of Bolted Joints under Cyclic Transverse Loads

2014 ◽  
Vol 487 ◽  
pp. 488-493 ◽  
Author(s):  
Shi Yuan Hou ◽  
Ri Dong Liao
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Step Length ◽  
Shear Loading ◽  
Bolted Joints ◽  
Shear Load ◽  
Clamping Force ◽  
The Finite Element Method ◽  
Force Amplitude ◽  
Transverse Loads

Self-loosening is one of the major failure reasons for bolted joints. Utilizing the finite element method, a 3-Dimension finite element model under dynamic shear loading is built to study the loosening of bolted fastener phenomenon. And the effect of increment step length, initial clamping force, amplitude of the shear load, thread tolerance, friction coefficients on the loosening process are studied.

scholarly journals Numerical simulation of fault development along NE-SW Himalayan profiles in Nepal

2004 ◽  
Vol 29 ◽  
Author(s):  
D. Chamlagain ◽  
D. Hayashi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Models ◽  
The Finite Element Method ◽  
Active Structures ◽  
Stress Orientation ◽  
State Of Stress ◽  
Tectonic Environment ◽  
Plate Kinematics ◽  
Element Method

We examined the state of stress in and around the Himalayan nappes via 2D finite element method using elastic rheology under plane strain condition. This paper describes how we used advanced numerical modelling technique, the finite element method to compute stress and fault as a function of rock layer properties, convergent displacement and boundary condition in the convergent tectonic environment. Interpretation of the calculated results remains somewhat ambiguous because of the limitation of elastic modelling, however, the results are still comparable with geological and geophysical data. Some interesting features of our models are: (1) compressive state of stress  in Himalaya; (2) effect of geometry of MHT on stress orientation; (3) the diffuse zone of failure elements along the flat-ramp-flat regions of the Main Himalayan Thrust (MHT); (4) normal and thrust faults pattern in the vicinity of Main Boundary Thrust (MBT) and Main Frontal Thrust (MFT); (5) initiation of faults at depth and their propagation toward south under increasing convergent dis placement,  which is consistent with the sequence of thrusting in Himalaya; and (6) direct correlation of simulated fault patterns with geological evidences. Thus overall features of the numerical models are able to conclude that the mid-crustal ramp, MBT and MFT are the most active structures in the present day plate kinematics.

Investigation of the stress-strain state of beams with different types of web perforation

2021 ◽  
Vol 103 (3) ◽  
pp. 79-87
Author(s):  
Ivan Pidgurskyi ◽  
Vasyl Slobodian ◽  
Denys Bykiv ◽  
Mykola Pidgurskyi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Strain State ◽  
Analytical Calculation ◽  
Complex Stress ◽  
The Finite Element Method ◽  
Stress Strain ◽  
Advantages And Disadvantages ◽  
Stress Strain State ◽  
Element Method

This article is devoted to evaluating the effectiveness of I-beams with different web perforations: hexagonal, round, oval and elliptical. The technology of manufacturing of castellated beams is described. For the purpose of verification the analytical calculation of the beam with hexagonal web perforation and for comparison the calculation by the finite element method is given. To correctly assess the stress-strain state, the mesh of finite elements in the area of openings was concentrated. The results of maximum normal stresses and strains obtained by different methods were compared with each other and the efficiency of using the finite element method to determine the stress-strain state of castellated beams was proved. In the castellated beams there is a complex stress-strain state, which was confirmed in this work for the most characteristic shapes of openings. Beams with hexagonal, round, oval (horizontal and vertical), elliptical and elliptical (rotated by 45°) openings are considered in the article, their geometric parameters and characteristics as well as advantages and disadvantages are described. Beams with round openings are currently the most widely used. In addition, the parameters that affect the efficiency of castellated beams with oval (horizontal and vertical) and elliptical rotated by 45° openings were identified. In this work, it was found that the shape of the openings significantly affects the stress-strain state of the castellated beams, especially for hexagonal openings, which are mainly used so far. The stress distribution in the first opening for each of the considered types of perforations and the nature of the change of σmax in other openings is shown. The stress-strain state of castellated beams was studied using the finite element method. The results of this study are of practical value because they can be used when arranging the sections and openings of castellated beams.

Finite Element Analysis of the Fatigue Strength of Threaded Fasteners Using Helical Thread Models

2009 ◽  
Author(s):  
Toshimichi Fukuoka ◽  
Masataka Nomura ◽  
Takashi Fuchikami
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Failure ◽  
Stress Amplitude ◽  
Numerical Models ◽  
Bolted Joints ◽  
Element Analysis ◽  
Thread Root ◽  
External Forces ◽  
Fatigue Failures

Fatigue failures of bolted joints frequently lead to serious accidents of machines and structures. It is well known that fatigue failure is likely to occur around the first thread root of bolt adjacent to the nut loaded surface and the run-out of bolt thread. That is because high stress amplitudes are generated there due to alternating external forces. Accordingly, it is significantly important to evaluate the stress amplitudes along the thread root in order to better define the fatigue failure mechanism of bolted joints. In this study, stress amplitude distributions along the thread helix including the thread run-out are analyzed by three-dimensional finite element analysis, where the numerical models of bolted joints are constructed so as to accurately take account of the effect of thread helical geometry, using the modeling scheme proposed in the previous paper. The analytical objectives are bolted joints with axi-symmetric geometry except for the helical-shaped threaded portions, and are subjected to axi-symmetric external forces. It has been substantiated, based on the stress amplitude distributions along the thread helix, that the fatigue failures are likely to originate from the first bolt thread, as in the case of the maximum stress, and the run-out of threads. Also shown is that the fatigue failure location varies depending on the distance between the target bolt and the loading position and whether or not there is a separation at the plate interface.

A Finite Element Analysis of Friction Damping in a Slip Joint

1999 ◽  
Author(s):  
Weijiang Chen ◽  
Xiaomin Deng
Keyword(s):  
Finite Element ◽  
Dynamic Behavior ◽  
Dry Friction ◽  
Numerical Test ◽  
Structural Models ◽  
Bolted Joints ◽  
Joint Interface ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Lumped Parameter

Abstract Micro-slip along frictional interfaces often provides the dominant damping mechanism in a built-up structure and plays an important role in the dynamic behavior of the structure. This paper presents the results of a finite element study of the effect of dry friction on the damping response of a slip joint. The emphasis of this paper is to understand the evolution of the slip and stick regions along the joint interface during loading and to quantify the amount of energy dissipation during cyclic loading and its dependence on structural and loading parameters. Finite element predictions have been compared to experimental measurements and early analytical predictions in the literature. This study seems to demonstrate the potential of the finite element method in providing adequate “numerical” test data for formulating lumped-parameter structural models that can simulate the nonlinear dynamic behavior of bolted joints.

Member Stiffness and Contact Pressure Distribution of Bolted Joints

1993 ◽  
Author(s):  
Terry F. Lehnhoff ◽  
Kwang-Il Ko ◽  
Matthew L. McKay
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Bolted Joints ◽  
Two Dimensional ◽  
Stress Distributions ◽  
Bolted Joint ◽  
Dimensional Problem ◽  
The Finite Element Method ◽  
Contact Pressure Distribution ◽  
Percent Difference

Abstract Member stiffnesses and the stress distributions in the bolts and members of bolted joints have been calculated for various bolt sizes, as well as thicknesses and materials of the members. The finite element method has been used to calculate the displacements and the stress distributions in the components of the bolted joint. Using axisymmetric elements, the bolted joint was analyzed as a two-dimensional problem. Member stiffness ratios were calculated from the finite element results and compared with those calculated by a commonly used theory. The differences in values were significant (16–30 percent difference) for the assumptions under which the theory was applied. Formulas and dimensionless curves which can be used to estimate the member stiffness ratios for several kinds of bolted joints are presented.

Member Stiffness and Contact Pressure Distribution of Bolted Joints

1994 ◽  
Vol 116 (2) ◽  
pp. 550-557 ◽  
Author(s):  
T. F. Lehnhoff ◽  
Kwang Il Ko ◽  
M. L. McKay
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Bolted Joints ◽  
Two Dimensional ◽  
Stress Distributions ◽  
Bolted Joint ◽  
Dimensional Problem ◽  
The Finite Element Method ◽  
Contact Pressure Distribution ◽  
Percent Difference

Member stiffnesses and the stress distributions in the bolts and members of bolted joints have been calculated for various bolt sizes, as well as thicknesses and materials of the members. The finite element method has been used to calculate the displacement and the stress distributions in the components of the bolted joint. Using axisymmetric elements, the bolted joint could be analyzed as a two-dimensional problem. Member stiffness ratios were calculated from the finite element results and compared with those calculated by a commonly used theory. The values were approximately comparable (16–30 percent difference) for the assumptions under which the theory was applied. Formulas and dimensionless curves which can be used to estimate the member stiffness ratios for several kinds of bolted joints are presented.

Sign in / Sign up

Export Citation Format

Share Document