Mechanical Behaviors of a Power Steering Hose Assembly during the Swaging Process

2007 ◽  
Vol 353-358 ◽  
pp. 2822-2827
Author(s):  
Byung Tak Kim ◽  
Seon Jin Kim ◽  
Sung Wi Koh ◽  
H.J. Kim
Keyword(s):  
Finite Element ◽  
Friction Coefficient ◽  
Physical Properties ◽  
Work Hardening ◽  
General Purpose ◽  
Finite Element Analyses ◽  
Mechanical Behaviors ◽  
Contact Conditions ◽  
Power Steering ◽  
Lagrange Formulation

In this study, finite element analyses for the mechanical behaviors of a power steering hose assembly during the swaging process were performed in order to investigate the stress level of hose components according to jaw strokes, and to examine the effect of friction coefficient on the contact force. The physical properties such as Mooney-Rivlin constants of rubber materials and the work-hardening data of the steel were obtained through the experiments, and the contact conditions identical to the swaging process were taken into account. Two reinforced layers included in the hose were modeled with axisymmetric rebar elements in the general-purpose program, MSC MARC2000. The updated Lagrange formulation and the large displacement option were employed in the analysis. The result interpretations were focused on the rubber components which are in contact with the metal components, because of their important roles in the hose efficiency.

Study on Wrinkles during Rotary-Draw Bending Forming

2019 ◽  
Vol 943 ◽  
pp. 43-47
Author(s):  
Xia Zhu ◽  
Keiji Ogi ◽  
Nagatoshi Okabe
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Friction Coefficient ◽  
General Purpose ◽  
Straight Tube ◽  
Tube Material ◽  
Rotary Draw Bending ◽  
Element Analysis ◽  
Draw Bending ◽  
Wrinkle Generation

The purpose of this research is to determine the state inside the material using finite-element analysis and to improve the performance of a rotary-draw bending forming by clarifying the mechanism of wrinkle generation. An analytical model of rotational drawing was made by using the general-purpose nonlinear finite-element analysis software MSC Marc, and the analytical results were compared with experimental results to verify the validity of the model. Furthermore, the mechanism of wrinkle generation was investigated. With the progress of processing, wrinkles occur not in the R part but in the original tube-side straight-tube part. The coefficient of friction between the tube material and the R portion of the bending mold promotes the occurrence of wrinkles and the growth of the generated wrinkles. Because wrinkles occur even if the friction coefficient between the tube material and bending mold R part is ignored, the generation condition of wrinkles also depends on parameters other than the friction coefficient.

Elastic-Plastic Analysis of Hydride Blisters in Zircaloy-2 Pressure Tubes

1988 ◽  
Vol 110 (3) ◽  
pp. 276-282 ◽  
Author(s):  
Y. J. Kim ◽  
M. L. Vanderglas
Keyword(s):  
Finite Element ◽  
Physical Properties ◽  
Volume Expansion ◽  
Zirconium Hydride ◽  
Finite Element Analyses ◽  
Elastic Plastic ◽  
Pressure Tubes ◽  
Plastic Analysis

The possibility that stresses might be produced as a consequence of expansion resulting from the transformation of zirconium to zirconium hydride in the form of blisters was investigated. Parametric elastic-plastic finite element analyses were performed because the physical properties near the blister were not clearly defined. Results show that significant stresses can arise from the volume expansion of hydride blisters, being largely compressive within the blister, tensile outside.

Friction and Wear in Metal Forming: 25 Years at LAMIH UMR CNRS 8201

2018 ◽  
Vol 767 ◽  
pp. 42-58 ◽  
Author(s):  
Laurent Dubar ◽  
André Dubois ◽  
Mirentxu Dubar
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Friction Coefficient ◽  
Metal Forming ◽  
Friction And Wear ◽  
Forming Process ◽  
Contact Conditions ◽  
Manufacturing Plants ◽  
Bulk Forming ◽  
Research Activities

Since the beginning of the 90’s, research activities focused on friction and wear in metal forming have been developed at the LAMIH UMR CNRS 8201 in Valenciennes. Specific methodologies have been designed to optimize a given forming process (bulk forming process or sheet forming process). These methodologies involve prototype benches which have been built to reproduce contact conditions encountered in manufacturing plants by taking specimens and contactors from the real industrial workpieces and tools. The evaluation of the friction coefficient added to the fine analysis of the surfaces have helped us to better understand friction and wear during processes. These facilities have been settled by numerical simulation at meso and macro scales by means of finite element methods. So, this paper is the sum up of the output of these methodologies with a specific focus on wear and lubrication, at room and hot temperatures.

An Effect of Gasket Contact Stress Distributions on the Tightness Estimation in Pipe Flange Connections by Finite Element Analyses

2004 ◽  
Author(s):  
Yasumasa Shoji
Keyword(s):  
Finite Element ◽  
Contact Stress ◽  
Elastic Interaction ◽  
General Purpose ◽  
Pressure Vessels ◽  
Plastic Behavior ◽  
Finite Element Analyses ◽  
Element Analysis ◽  
Bolt Stress ◽  
The Relationship

Recently bolting procedures for flanged connection is one of the important research topics, and several procedures for bolting process are proposed or about to be issued. These procedures are based on bolting experimental and/or analytical results, namely by Finite Element Analyses. Among these researches, only a few are addressing the relationship between bolt tension scatter and gasket contact stress distribution. Bolt tension scatters in nature due to elastic interaction of the bolts as the bolts are tightened one by one. In order to obtain a uniform, or nearly uniform, tension along all the joint bolts, many “rounds” or “passes” are necessary to eliminate this elastic interaction. If the installer does not iterate this tightening process, gasket stress will be distributed undesirably due to the bolt tension scatter. The bolt tension scatter is now mostly calculated using the analysis programs that are developed by research laboratories themselves. In this paper, the author suggests to use a general purpose finite element analysis code for bolt stress, gasket stress and flange stress, which accommodates such advanced functions as bolt pretension and gasket plastic behavior. The author will show that it is possible to analyze the bolt tension, gasket stress and flange stress at the same time using a market sold analysis code, ABAQUS, and examine how many “rounds” are necessary to achieve uniform gasket contact stress. This paper also describes the relationship between the gasket contact stress and the bolt tension scatter, and the effect of internal pressure of piping or pressure vessels. Based on these results, the tightness parameters are estimated and the methods in the standards are verified in the aspect of allowable and achieved leakage.

The Effects of Bolt Tightening Sequences on the Mechanical Behaviors of Gasketed Flange Joint

2019 ◽  
Author(s):  
Chia-Lung Chang ◽  
Jung Xian Huang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Flange Joint ◽  
Mechanical Behaviors ◽  
Contact Conditions ◽  
3D Elements ◽  
Contact Surfaces ◽  
Stress And Deformation ◽  
Element Method

Abstract During tightening bolts on the flange joint, a load is applied on each bolt. The deformation and stress on joint parts vary with magnitude and location of applying bolt forces. Therefore, sequence of tightening bolts has effects on the deformation and accumulated stress on joint parts. Finite element method is used to model the flange joint and to simulate effects of bolt tightening sequence on the deformation and stress on joint parts. The model includes bolts, nuts, raised face flanges, and gasket. Contact conditions are set on contact surfaces between contact parts. 3D elements are used to build the model. In order to prevent leaks, the bolt load and gasket pressure should be uniform. The accumulated stress of bolts and gasket are calculated. The deformation of gasket and flange are also simulated. The model is used to simulate the stress and deformation of flange joint generated by various bolt tightening sequences. The optimal tightening sequence is selected by that the variation of accumulated stress on gasket is the least.

Finite Element Simulation of Wheel-Rail Contact Dynamic Instabilities Under Sliding Conditions

2005 ◽  
Author(s):  
A. Saulot ◽  
L. Baillet
Keyword(s):  
Finite Element ◽  
Friction Coefficient ◽  
Mechanical Model ◽  
Coulomb Friction ◽  
Rotating Disc ◽  
Contact Conditions ◽  
Rail Corrugation ◽  
Temporal Study ◽  
Element Simulation ◽  
Constant Friction

Using dynamic finite element methods, a temporal study of the dynamic response of a 2D mechanical model composed of a deformable rotating disc (wheel) in contact with a deformable translating body (rail) with constant Coulomb friction is presented. Under global sliding conditions, instabilities at specific frequencies appear in the contact patch even in the case of a constant friction coefficient. The influence of parameters such as global sliding ratio, friction coefficient and transient value of applied sliding on local contact conditions is evaluated. A parallel is then drawn between the frequencies of these instabilities and the modal analysis of the entire mechanical model. Finally, consequences of these instabilities on local rail plastification are presented and correlated with rail corrugation appearing on straight tracks under acceleration or deceleration conditions.

Modeling of an Elastomeric Friction Damper

2009 ◽  
Vol 82 (2) ◽  
pp. 170-183
Author(s):  
C. G. Li ◽  
S. W. Wang ◽  
H. Y. Lu
Keyword(s):  
Finite Element ◽  
Friction Coefficient ◽  
Frictional Resistance ◽  
Design Parameters ◽  
Finite Element Analyses ◽  
Friction Damper ◽  
Principle Of Superposition ◽  
Closed Form Solutions ◽  
New Class ◽  
Force Equilibrium

Abstract Frictional resistance of a hollow rubber cylinder steadily sliding inside a rigid sleeve has been studied theoretically and reported here. This is inspired by a new class of elastomeric friction damper consisting of an unbonded rubber cylinder, axially compressed and radially expanding to contact an outer rigid sleeve and generate friction. By considering the force equilibrium of each thin section of the rubber cylinder and adapting the principle of superposition, the tri-bological problem was decomposed into three fundamental sub-problems, which were solved consecutively. The results shed lights on the functional effects of various design parameters such as part dimensions, friction coefficient, and Young's modulus on the total friction force. Finite element analyses were also performed, and the results were compared with the closed-form solutions.

A Quantitative Theory for the Computation of Tire Friction Under Severe Conditions of Sliding

1986 ◽  
Vol 14 (1) ◽  
pp. 44-72 ◽  
Author(s):  
C. M. Mc C. Ettles
Keyword(s):  
Friction Coefficient ◽  
Flash Temperature ◽  
Contact Conditions ◽  
Quantitative Form ◽  
Heating Effects ◽  
Rubber Friction ◽  
Viscoelastic Effects ◽  
Tire Friction ◽  
Pavement Friction ◽  
Metal Polymer

Abstract It is proposed that tire-pavement friction is controlled by thermal rather than by hysteresis and viscoelastic effects. A numerical model of heating effects in sliding is described in which the friction coefficient emerges as a dependent variable. The overall results of the model can be expressed in a closed form using Blok's flash temperature theory. This allows the factors controlling rubber friction to be recognized directly. The model can be applied in quantitative form to metal-polymer-ice contacts. Several examples of correlation are given. The difficulties of characterizing the contact conditions in tire-pavement friction reduce the model to qualitative form. Each of the governing parameters is examined in detail. The attainment of higher friction by small, discrete particles of aluminum filler is discussed.

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