Numerical Simulation of Contact Pressure Evolution in Fretting

1994 ◽  
Vol 116 (2) ◽  
pp. 247-254 ◽  
Author(s):  
L. Johansson
Keyword(s):  
Numerical Simulation ◽  
Contact Pressure ◽  
Stability Criterion ◽  
Frictional Contact ◽  
Elastic Bodies ◽  
Numerical Instabilities ◽  
Archard’S Law Of Wear ◽  
Pressure Evolution

In the present paper an algorithm for frictional contact between two elastic bodies is presented. The algorithm is applied to the calculation of the evolution of contact pressure between two elastic bodies when material is being removed by fretting. To this end Archard’s law of wear is implemented into the algorithm. It is noticed that the calculated pressures after a period of fretting differ considerably from the initial Hertz type pressures. Further, it is noted that numerical instabilities can occur in explicit type wear calculations, and a stability criterion is suggested.

Contact pressure evolution and its relation to wear in sheet metal forming

Wear ◽  
2008 ◽  
Vol 265 (11-12) ◽  
pp. 1687-1699 ◽  
Author(s):  
Michael P. Pereira ◽  
Wenyi Yan ◽  
Bernard F. Rolfe
Keyword(s):  
Contact Pressure ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Pressure Evolution

scholarly journals Consensus Control Design for 360 MN Extrusion Machine Producing Process

2014 ◽  
Vol 2014 ◽  
pp. 1-16
Author(s):  
Chao Wang ◽  
Wanzhou Li ◽  
Qianchuan Zhao ◽  
Fei Peng ◽  
Hongbin Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Control Theory ◽  
Strong Coupling ◽  
Multiagent Systems ◽  
Stability Criterion ◽  
Control Design ◽  
Consensus Control ◽  
Convergence Conditions ◽  
Stabilization Control ◽  
Coupling System

This paper mainly addresses the issue of 360 MN extrusion machine and focuses on the stabilization control of main table attitude. We will first introduce the problem and then model the extrusion machine. As the machine is a multi-input multioutput (MIMO) and strong coupling system, it is challenging to apply existing control theory to design a controller to stabilize the main table attitude. Motivated by recent research in the field of multiagent systems, we design a consensus control protocol for our system and derive our convergence conditions based directly on Routh stability criterion. The advantages of the design are also demonstrated by numerical simulation.

Contact pressure evolution at the die radius in sheet metal stamping

2009 ◽  
Vol 209 (7) ◽  
pp. 3532-3541 ◽  
Author(s):  
Michael P. Pereira ◽  
John L. Duncan ◽  
Wenyi Yan ◽  
Bernard F. Rolfe
Keyword(s):  
Contact Pressure ◽  
Sheet Metal ◽  
Sheet Metal Stamping ◽  
Metal Stamping ◽  
Pressure Evolution

scholarly journals Contact pressure and sliding velocity ranges in sheet metal forming simulations

2021 ◽  
Author(s):  
Joseba Cillaurren ◽  
Lander Galdos ◽  
Mario Sanchez ◽  
Alaitz Zabala ◽  
Eneko Saenz de Argandoña ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Contact Pressure ◽  
Sheet Metal ◽  
Coefficient Of Friction ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Sliding Velocity ◽  
Wide Range ◽  
The Coefficient Of Friction ◽  
Friction Models

In the last few years many efforts have been carried out in order to better understand what the real contact between material and tools is. Based on the better understanding new friction models have been developed which have allowed process designers to improve numerical results in terms of component viability and geometrical accuracy. The new models define the coefficient of friction depending on different process parameters such as the contact pressure, the sliding velocity, the material strain, and the tool temperature. Many examples of the improvements achieved, both at laboratory scale and at industrial scale, can be found in the recent literature. However, in each of the examples found in the literature, different ranges of the variables affecting the coefficient of friction are covered depending on the component analysed and the material used to produce such component. The present work statistically analyses the contact pressure and sliding velocity ranges achieved during numerical simulation (FEM) of sheet metal forming processes. Nineteen different industrial components representing a high variety of shapes have been studied to cover a wide range of casuistic. The contact pressure and sliding velocity corresponding to typical areas of the tooling have been analysed though numerical simulation in each case. This study identifies the ranges of contact-pressure and sliding velocities occurring in sheet metal forming aimed to set the characterization range for future friction studies.

Numerical Simulation of Dynamic Bending Deflection of a Disc Cam Profile With Roller Follower System

2020 ◽  
Author(s):  
Louay S. Yousuf ◽  
Yaakob K. H. Dabool
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Dynamic Response ◽  
Contact Pressure ◽  
Infrared Camera ◽  
Radius Of Curvature ◽  
Element Analysis ◽  
Cam Profile ◽  
Maximum Contact

Abstract The bending deflection of the disc cam profile and the dynamic response of the follower were discussed and analyzed for three paths of contact. The objective of this paper was to study the influence of maximum contact pressure on the bending deflection of the cam profile. Numerical simulation was carried out using SolidWorks Software to simulate the follower displacement, velocity and acceleration. Finite element analysis was used taking into account the use of ANSYS package to calculate the bending deflection. The experiment setup had been done through an infrared camera device. The bending deflection of point (18) is bigger than the bending deflection of point (4) because of the bigness of radius of curvature of nose (2).

A simple node-to-segment contact technique of finite element models of elastic bodies to attain the node-to-node contact accuracy

2013 ◽  
Vol 228 (7) ◽  
pp. 1089-1093 ◽  
Author(s):  
Kisu Lee
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Contact Point ◽  
Finite Element Models ◽  
Elastic Bodies ◽  
Contact Constraint

By modifying the contact point displacement with a simple and systematic way, it has been explained that the node-to-segment contact solution can become as accurate as that of the node-to-node contact constraint. The accuracy of the solution is demonstrated by the numerical simulation using a punch sliding on the slab.

Determination of the Expansion Parameters for the Combined Welding and Expanding Connection of Tube-to-Tubesheet

2010 ◽  
Vol 118-120 ◽  
pp. 186-190
Author(s):  
Hui Fang Li ◽  
Cai Fu Qian ◽  
Lan Wang
Keyword(s):  
Numerical Simulation ◽  
Contact Pressure ◽  
Contact Surface ◽  
Driving Force ◽  
Expansion Pressure

In this paper, numerical simulation for hydraulic expanding connection of tube to tubesheet was performed. Residual contact preesure on the contact surface between tube and tubesheet as well as residual expansion stress in the tubesheet were investigated. It is seen the distribution of residual contact pressure is not uniform. Instead, near the two tubesheet surfaces, there are two tightness bands on which the residual contact pressure is high. Based on the fact that residual expansion stress could be a driving force for the tubesheet cracking, it is suggested that the expansion pressure should not be too large but enough to completely form the tightness bands on the contact surface. With this criterion, expansion pressures for typical tube materals and size are given.

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