Quantifying the spreading currents over the circular contact region in a good conducting cover layer on a substrate

2020 ◽  
Vol 53 (43) ◽  
pp. 435103 ◽  
Author(s):  
Kazuhiko Seki
Keyword(s):  
Contact Region ◽  
Cover Layer ◽  
Circular Contact

Oil-Film Starvation in Elastohydrodynamic Circular Contacts

1977 ◽  
Vol 19 (1) ◽  
pp. 22-29 ◽  
Author(s):  
A. Vakilzadeh ◽  
R. Gohar
Keyword(s):  
Film Thickness ◽  
Contact Region ◽  
Oil Droplet ◽  
Oil Film ◽  
Circular Contact

A formula for the oil-film thickness in a starved, elastohydrodynamic, circular contact is presented in terms of external parameters. Experiments are described which confirm the theory. Also examined are the oil droplet around the contact region, and the track shape made by the passage of the balls on the races.

The Stress Field Created by a Circular Sliding Contact

1966 ◽  
Vol 33 (2) ◽  
pp. 371-376 ◽  
Author(s):  
G. M. Hamilton ◽  
L. E. Goodman
Keyword(s):  
Stress Field ◽  
Tensile Stress ◽  
Contact Region ◽  
Normal Pressure ◽  
Maximum Tensile Stress ◽  
Sliding Contact ◽  
Constant Yield ◽  
Circular Contact

Equations are obtained for the complete stress field due to a circular contact region carrying a “hemispherical” Hertzian normal pressure and a proportional distributed shearing traction. The equations are illustrated by graphs of a constant-yield parameter and graphs of maximum tensile stress.

Analysis of the Contact Deformation of a Radial Tire with Camber Angle

1995 ◽  
Vol 23 (1) ◽  
pp. 26-51 ◽  
Author(s):  
S. Kagami ◽  
T. Akasaka ◽  
H. Shiobara ◽  
A. Hasegawa
Keyword(s):  
Pressure Distribution ◽  
Contact Pressure ◽  
Contact Region ◽  
Contact Deformation ◽  
Contact Pressure Distribution ◽  
Radial Tire ◽  
Ring Model ◽  
Camber Angle ◽  
Contact Free ◽  
Good Agreement

Abstract The contact deformation of a radial tire with a camber angle, has been an important problem closely related to the cornering characteristics of radial tires. The analysis of this problem has been considered to be so difficult mathematically in describing the asymmetric deformation of a radial tire contacting with the roadway, that few papers have been published. In this paper, we present an analytical approach to this problem by using a spring bedded ring model consisting of sidewall spring systems in the radial, the lateral, and the circumferential directions and a spring bed of the tread rubber, together with a ring strip of the composite belt. Analytical solutions for each belt deformation in the contact and the contact-free regions are connected by appropriate boundary conditions at both ends. Galerkin's method is used for solving the additional deflection function defined in the contact region. This function plays an important role in determining the contact pressure distribution. Numerical calculations and experiments are conducted for a radial tire of 175SR14. Good agreement between the predicted and the measured results was obtained for two dimensional contact pressure distribution and the camber thrust characterized by the camber angle.

State of Stress in the Near-Contact Region of a Semiconductor during Metallization Track Electrodegradation

2020 ◽  
Vol 2020 (13) ◽  
pp. 1658-1662
Author(s):  
A. A. Skvortsov ◽  
S. M. Zuev ◽  
M. V. Koryachko ◽  
E. B. Voloshinov
Keyword(s):  
Contact Region ◽  
State Of Stress

scholarly journals Measurements of periodically perturbed dewetting force fields and their consequences on the symmetry of the resulting patterns

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Konstantinos Roumpos ◽  
Sarah Fontaine ◽  
Thomas Pfohl ◽  
Oswald Prucker ◽  
Jürgen Rühe ◽  
...  
Keyword(s):  
Force Field ◽  
Driving Force ◽  
Force Fields ◽  
Contact Lines ◽  
Polymer Flow ◽  
Circular Symmetry ◽  
Pillar Array ◽  
Restoring Forces ◽  
Micro Pillars ◽  
Circular Contact

AbstractWe studied the origin of breaking the symmetry for moving circular contact lines of dewetting polymer films suspended on a periodic array of pillars. There, dewetting force fields driving polymer flow were perturbed by elastic micro-pillars arranged in a regular square pattern. Elastic restoring forces of deformed pillars locally balance driving capillary forces and broke the circular symmetry of expanding dewetting holes. The observed envelope of the dewetting holes reflected the symmetry of the underlying pattern, even at sizes much larger than the characteristic period of the pillar array, demonstrating that periodic perturbations in a driving force field can establish a well-defined pattern of lower symmetry. For the presented system, we succeeded in squaring the circle.

Zero-field MAMMOS recording system with a blue laser, NA=0.95 lens, fast magnetic coil, and thin cover layer

2003 ◽  
Author(s):  
Ferry Zijp ◽  
Ruud J. M. Vullers ◽  
H. W. van Kesteren ◽  
Martin B. van der Mark ◽  
C. A. van den Heuvel ◽  
...  
Keyword(s):  
Recording System ◽  
Blue Laser ◽  
Zero Field ◽  
Cover Layer ◽  
Magnetic Coil

Rough Air-Soft Elastohydrodynamic Lubrication

2013 ◽  
Vol 420 ◽  
pp. 30-35
Author(s):  
Khanittha Wongseedakaew ◽  
Jesda Panichakorn
Keyword(s):  
Surface Roughness ◽  
Film Thickness ◽  
Modulus Of Elasticity ◽  
Contact Region ◽  
Elastohydrodynamic Lubrication ◽  
Multilevel Methods ◽  
Inlet Temperature ◽  
Film Pressure ◽  
Air Inlet ◽  
Air Film

This paper presents the effects of rough surface air-soft elastohydrodynamic lubrication (EHL) of rollers for soft material under the effect of air molecular slip. The time independent modified Reynolds equation and elasticity equation were solved numerically using finite different method, Newton-Raphson method and multigrid multilevel methods were used to obtain the film pressure profiles and film thickness in the contact region. The effects of amplitude of surface roughness, modulus of elasticity and air inlet temperature are examined. The simulation results showed surface roughness has effect on film thickness but it little effect to air film pressure. When the amplitude of surface roughness and modulus of elasticity increased, the air film thickness decreased but air film pressure increased. However, the air inlet temperature increased when the air film thickness increased.

A simplified formulation of adhesion problems with elastic plates

2009 ◽  
Vol 465 (2107) ◽  
pp. 2217-2230 ◽  
Author(s):  
Carmel Majidi ◽  
George G. Adams
Keyword(s):  
Potential Energy ◽  
Contact Area ◽  
Contact Region ◽  
Bending Moment ◽  
Total Potential Energy ◽  
Work Of Adhesion ◽  
Contact Radius ◽  
Algebraic Complexity ◽  
Elastic Plates ◽  
Total Potential

The solution of adhesion problems with elastic plates generally involves solving a boundary-value problem with an assumed contact area. The contact region is then found by minimizing the total potential energy with respect to the contact area (i.e. the contact radius for the axisymmetric case). Such a procedure can be extremely long and tedious. Here, we show that the inclusion of adhesion is equivalent to specifying a discontinuous internal bending moment at the contact region boundary. The magnitude of this moment discontinuity is related to the work of adhesion and flexural rigidity of the plate. Such a formulation can greatly reduce the algebraic complexity of solving these problems. It is noted that the related plate contact problems without adhesion can also be solved by minimizing the total potential energy. However, it has long been recognized that it is mathematically more efficient to find the contact area by specifying a continuous internal bending moment at the boundary of the contact region. Thus, our moment discontinuity method can be considered to be a generalization of that procedure which is applicable for problems with adhesion.

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