Possibility of slip in hydrodynamic oil films under sliding contact conditions

2002 ◽  
Vol 14 (3) ◽  
pp. 303-320 ◽  
Author(s):  
B. Ono ◽  
Y. Yamamoto
Keyword(s):  
Sliding Contact ◽  
Contact Conditions ◽  
Oil Films

Viscoelastic Contact of a Half-Plane Sliding Over a Slightly Wavy Rigid Surface

2014 ◽  
Author(s):  
N. Menga ◽  
C. Putignano ◽  
T. Contursi ◽  
G. Carbone
Keyword(s):  
Contact Problem ◽  
Contact Area ◽  
Analytical Procedure ◽  
Sliding Contact ◽  
Rigid Surface ◽  
Viscoelastic System ◽  
Contact Conditions ◽  
Partial Contact ◽  
Full Contact ◽  
Viscoelastic Contact

In this paper, the sliding contact of a rigid sinusoid over a viscoelastic halfplane is studied by means of an analytical procedure that reduced the original viscoelastic system to an elastic equivalent one, which has been already solved in [1]. In such a way, the solution of the original viscoelastic contact problem requires just to numerically solve a set of two integral equations. Results show the viscoelasticity influence on the solution by means of a detailed analysis of contact area, pressure and displacement distribution. A particular attention is paid to the transition from full contact to partial contact conditions.

610 Effects of Slip Ratio and Roller Combination on Durability of Thermally Sprayed wc Cerment Coating under Dry Rolling/Sliding Contact Conditions

2012 ◽  
Vol 2012.65 (0) ◽  
pp. 211-212
Author(s):  
Toshifumi MAWATARI ◽  
Yusuke ARAKI ◽  
Ryosuke INOKUCHI ◽  
Bo ZHANG ◽  
Akira NAKAJIMA ◽  
...  
Keyword(s):  
Sliding Contact ◽  
Contact Conditions ◽  
Slip Ratio ◽  
Thermally Sprayed

Modelling Transient Behavior of a Mechanical System Including a Rolling and Sliding Contact

Tribology ◽  
2005 ◽  
Author(s):  
Anders So¨derberg ◽  
Christer Spiegelberg
Keyword(s):  
Contact Stiffness ◽  
Transient Behavior ◽  
Measurement Procedure ◽  
Sliding Contact ◽  
Contact Model ◽  
Test Equipment ◽  
Main Concern ◽  
Contact Conditions ◽  
Machine Elements ◽  
Precision Machines

The friction and wear of rolling and sliding contacts are critical factors for the operation of machine elements such as bearings, gears, and cam mechanisms. In precision machines, for example, the main concern is to compensate for frictional losses, so as to improve control accuracy. In other applications it is often desirable to minimize friction losses to improve efficiency, though sometimes high friction is desired to prevent sliding and wear. The aim of this study is to simulate the behavior of a test equipment and show that simulations can be used to study and optimize mechanical systems that include rolling and sliding contact. Simulations can be used to study the system as a whole, as well as the contact conditions. The test equipment and the measurement procedure used are described. In the simulations, a contact model designed to handle transient contact conditions is integrated into a system model. The results show that the contact strongly influences the system. The simulations show that the use of a contact model allows the simulation of systems that contain contacts with different amounts of slip, and that such simulations can be used to study the contact as well as the system. Surface roughness influences the contact stiffness and is included in the simulations.

Analysis of Metal Flow of Aluminum through Long Choked Die Channels

2009 ◽  
Vol 424 ◽  
pp. 145-152 ◽  
Author(s):  
Henry Sigvart Valberg
Keyword(s):  
Cross Section ◽  
Channel Wall ◽  
Metal Flow ◽  
Extrusion Process ◽  
Sliding Contact ◽  
Aluminum Extrusion ◽  
Grid Pattern ◽  
Contact Conditions ◽  
New Knowledge ◽  
Flow Through

The mechanics of metal flow through long choked die channels have been investigated in unlubricated hot aluminum extrusion. Experiments were performed in a laboratory press at an earlier occasion by letting a grid pattern introduced into the billet flow down into the choked die channel to appear adjacent to the channel wall. The grid pattern was then revealed to characterize the metal flow in the channel. A 2D-model of the extrusion process was made. The model was applied to study the conditions in the extrusion experiments and in this model good similarity was obtained with the experiment. New knowledge regarding the metal flow through a choked die channel have been obtained this way, such as; contact conditions, presence of sticking and sliding zones, friction conditions in the sliding contact zone and the velocity profile over the cross-section of the channel.

Thermal Study of the Dry Sliding Contact With Third Body Presence

2008 ◽  
Author(s):  
David Richard ◽  
Mathieu Renouf ◽  
Yves Berthier ◽  
Ivan Iordanoff
Keyword(s):  
Thermal Study ◽  
Point Of View ◽  
Sliding Contact ◽  
Dry Sliding ◽  
Third Body ◽  
Contact Conditions ◽  
Microscopic Scale ◽  
The Third ◽  
Local Cohesion

The objective of this paper is to highlight the influence of the rheology of a third body in dry sliding contact conditions. It has been shown that the local cohesion of the third body can create an asymmetric dissipative field through its thickness. The present study puts forward the consequences from a thermal point of view, overcoming the inherent experimental difficulties at this microscopic scale.

Contact of Coated Systems Under Sliding Conditions

2006 ◽  
Vol 128 (4) ◽  
pp. 886-890 ◽  
Author(s):  
Lifeng Ma ◽  
Alexander M. Korsunsky ◽  
Kun Sun
Keyword(s):  
Integral Equations ◽  
Singular Integral ◽  
Singular Integral Equations ◽  
Contact Problems ◽  
Sliding Contact ◽  
Integration Scheme ◽  
Singular Behavior ◽  
Contact Conditions ◽  
Numerical Integration Scheme ◽  
Traction Distribution

The contact of coated systems under sliding conditions is considered within the framework of elasticity theory with the assumption of perfect bond between coating and substrate. Formulation is introduced in the form of a system of coupled singular integral equations of the second kind with Cauchy kernels that describe contact problems for coated bodies under complete, semi-complete and incomplete contact conditions. Accurate and efficient numerical method for the solution of sliding contact problems is described. Explicit results are presented for the interpolative Gauss-Jacobi numerical integration scheme for singular integral equations of the second kind with Cauchy kernels. The method captures correctly both regular and singular behavior of the traction distribution near the edges of contact. Several cases of sliding contact are considered to demonstrate the validity of the method.

The Strength of Some Non-Hertzian Plane Contacts

1986 ◽  
Vol 108 (4) ◽  
pp. 655-658 ◽  
Author(s):  
A. Sackfield ◽  
D. A. Hills
Keyword(s):  
Stress Field ◽  
Half Plane ◽  
Chebyshev Polynomials ◽  
Sliding Contact ◽  
Elastic Contact ◽  
Contact Conditions ◽  
Large Load ◽  
Practical Implications

The problem of plane elastic contact between a symmetrical indentor and a half-plane is addressed. The form of the contacting profile of the indentor is represented in terms of Chebyshev polynomials, and the resulting stress-field is deduced, for both static and sliding contact. It is shown that by making the profile somewhat flatter than a cylinder a large load may be sustained without yielding. Practical implications of the result, including profiles needed to attain optimal contact conditions, are discussed.

Friction and Wear of Ceramics for Magnetic Recording Applications: Part I—A Review

1990 ◽  
Vol 112 (1) ◽  
pp. 1-16 ◽  
Author(s):  
S. Chandrasekar ◽  
Bharat Bhushan
Keyword(s):  
Thin Film ◽  
Magnetic Recording ◽  
Friction And Wear ◽  
Material Selection ◽  
Sliding Contact ◽  
Contact Conditions ◽  
Rigid Disk ◽  
Factors Influencing ◽  
Lubricated Sliding

The friction and wear of ceramics under lightly-loaded, marginally-lubricated sliding-contact conditions are reviewed. The mechanism of ceramic friction and wear and the factors influencing them in these situations are identified and discussed with reference to the results presented in the literature. The implications to slider-material and thin-film rigid-disk overcoat material selection in magnetic recording devices are discussed.

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