scholarly journals On a Simplified Model for Numerical Simulation of Wear During Dry Rolling Contacts

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
L. Chevalier ◽  
A. Eddhahak-Ouni ◽  
S. Cloupet
Keyword(s):  
Contact Area ◽  
Power Distribution ◽  
Contact Problems ◽  
Rolling Contact ◽  
Normal Loading ◽  
Fast Determination ◽  
Wear Process ◽  
Simplified Approach ◽  
Rolling Contacts

We deal with rolling contact between quasi-identical bodies. As normal and tangential problems are uncoupled in that case, the simplified approach to determine contact area and normal loading distribution for rolling contact problems is presented in Sec. 2. In Sec. 3, the solution of the tangential problem is used to update the rolling profiles and enables to follow the wear evolution versus time. The method used to solve the normal problem is called semi-Hertzian approach with diffusion. It allows fast determination of the contact area for non-Hertzian cases. The method is based on the geometrical indentation of bodies in contact: The contact area is found with correct dimensions but affected by some irregularities coming from the curvature’s discontinuity that may arise during a wear process. Diffusion between independent stripes smoothes the contact area and the pressure distribution. The tangential problem is also solved on each stripe of the contact area using an extension of the simplified approach developed by Kalker and called FASTSIM. At the end, this approach gives the dissipated power distribution in the contact during rolling and this power is related to wear by Archard’s law. This enables the profiles of the bodies to be updated and the evolution of the geometry to be followed.

Finite Element Analysis of Rolling Contact Problems Using Minimum Dissipation of Energy Principle

1998 ◽  
Vol 65 (1) ◽  
pp. 271-273 ◽  
Author(s):  
S. K. Rathore ◽  
N. N. Kishore
Keyword(s):  
Finite Element ◽  
Contact Region ◽  
Contact Problems ◽  
Rolling Contact ◽  
Element Analysis ◽  
Energy Principle ◽  
Dissipation Of Energy ◽  
Rolling Surface ◽  
Strain Stress

In steady rolling motion, the loads and the fields of strain, stress, and deformations do not change with time at the contact region, as the contact region is continuously being formed by a new rolling surface. The principle of minimum dissipation of energy and the concept of traveling finite elements are made use of in solving such problems and the determination of micro-slips. The conditions of contact are discovered by use of the kinematic constraints and the Coulomb’s law of friction. A two-dimensional plane-strain finite element method along with the iterative procedure is used. The results obtained are in good agreement with expected behavior.

Novel Microstrip-Based Simplified Approach for Fast Determination of Substrate Permittivity

2018 ◽  
Vol 8 (4) ◽  
pp. 660-669 ◽  
Author(s):  
Nilesh Kumar Tiwari ◽  
Surya Prakash Singh ◽  
M. Jaleel Akhtar
Keyword(s):  
Fast Determination ◽  
Simplified Approach

Wear Mechanism of Ceramic Materials in Dry Rolling Friction

1986 ◽  
Vol 108 (4) ◽  
pp. 522-526 ◽  
Author(s):  
S. S. Kim ◽  
K. Kato ◽  
K. Hokkirigawa ◽  
H. Abe´
Keyword(s):  
Silicon Nitride ◽  
Wear Rate ◽  
Contact Area ◽  
Ceramic Materials ◽  
Rolling Friction ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Hertzian Contact ◽  
Real Contact Area ◽  
Wear Process

Wear tests in dry rolling contact were carried out at room temperature on five ceramic materials, such as silicon nitride, silicon carbide, cermet, titania, and alumina. The results showed that wear rate of silicon nitride was smaller than any of the other ceramic materials and bearing steel. Observations of worn surface and wear debris revealed that ceramic materials have two types of wear, one related to real contact area and another related to Hertzian contact area. It was also found that brittle fracture dominates the wear process of ceramic materials in dry rolling contact. Based on the experimental results, wear rate of ceramic materials was expressed with a new nondimensional parameter.

scholarly journals ON A STEPPING METHOD FOR THE NON STEADY ROLLING CONTACT RESOLUTION

1970 ◽  
Vol 40 (2) ◽  
pp. 131-136
Author(s):  
Anissa Eddhahak ◽  
Luc Chevalier
Keyword(s):  
Finite Difference ◽  
Wear Rate ◽  
Difference Scheme ◽  
Contact Area ◽  
Finite Difference Scheme ◽  
Life Time ◽  
Contact Problems ◽  
Rolling Contact ◽  
Transient Phenomena ◽  
Numerical Tools

The importance of contact and surface problems in industrial machining requires specific studies by tribological researchers to help engineering developments. During cyclic rolling, mechanical components may fail from wear fatigue and it is necessary to develop numerical tools based on simplified approaches to quantify their life time. Numerous wear equations reported in literature have shown that the wear rate is in most cases linked to the traction and the velocities which occur in the contact area. The knowledge of these parameters at every time enables us to follow the wear evolution in the softer material. In this paper, we suggest a stepping method to solve the non steady rolling contact problems. This method is based on the well known approach Fastsim of Kalker and integrates a numerical finite difference scheme to describe the evolution of transient phenomena occurring during non steady rolling contact.Key Words: Rolling Contact; Non Steady; Stepping Approach; Fastsim.DOI: 10.3329/jme.v40i2.5354Journal of Mechanical Engineering, Vol. ME 40, No. 2, December 2009 131-136

Experimental determination of adhesion and slip areas in rolling contact

1970 ◽  
Vol 5 (3) ◽  
pp. 193-199 ◽  
Author(s):  
E Ollerton ◽  
R Pigott
Keyword(s):  
Steady State ◽  
Experimental Determination ◽  
Experimental Technique ◽  
Contact Area ◽  
Rapid Determination ◽  
Glass Plate ◽  
Rolling Contact ◽  
Ground Glass ◽  
Steady State Rolling

An experimental technique has been developed to allow the rapid determination of adhesion and slip areas in steady-state rolling contact. The technique consists in rolling solid black-rubber toroids on a ground-glass plate under carefully controlled conditions. It enables the division of the contact area into slip and adhesion areas to be observed and photographed whilst rolling is taking place. A loading frame was devised to enable rolling with longitudinal shearing traction, rolling with transverse creep, and rolling with spin to be investigated either separately or in combinations. The results of the experiments have been compared with existing theories, and some conclusions as to the accuracy of the theories have been made.

scholarly journals Measurement of the Actual Contact Area of Details by the Power of a Reflected Light Beam Directed to a Contact Surface Covered with a Film

2018 ◽  
Vol 22 ◽  
pp. 01014
Author(s):  
Arkadiy Titov ◽  
Anna Sandulyak ◽  
Mikhail Baharev ◽  
Alexander Sandulyak
Keyword(s):  
Thin Film ◽  
Contact Area ◽  
Contact Surface ◽  
Friction And Wear ◽  
Optical Scheme ◽  
Normal Loading ◽  
Reflected Light ◽  
Labor Consuming ◽  
Dust Surface

Measurement of the actual area of details contact is important for control of friction and wear of such details. For this purpose, in particular, on a surface of one of details of couple covered with the thinnest layer of lubricant the thin film of coal is putted. On the raised dust surface impose the second detail of couple and squeeze them the application of normal loading. Light spots of contact are measured by planimetry. Instead of direct (labor-consuming) measurement of a large number of the areas of spots of contacts it is expedient to use integrated determination of the actual area of details – on the power of the beam of light reflected from ledges of a contact surface. The optical scheme of the device is developed, the efficiency of which for implementation is shown. Measurement of the actual area of details contact is important for control of friction and wear of such details. For this purpose, in particular, on a surface of one of details of couple covered with the thinnest layer of lubricant the thin film of coal is putted. On the raised dust surface impose the second detail of couple and squeeze them the application of normal loading. Light spots of contact are measured by planimetry. Instead of direct (labor-consuming) measurement of a large number of the areas of spots of contacts it is expedient to use integrated determination of the actual area of details – on the power of the beam of light reflected from ledges of a contact surface. The optical scheme of the device is developed, the efficiency of which for implementation is shown.

Causes of Microslip in a Continuously Variable Transmission

2007 ◽  
Vol 130 (1) ◽  
Author(s):  
Songho Kim ◽  
Carl Moore ◽  
Michael Peshkin ◽  
J. Edward Colgate
Keyword(s):  
Contact Area ◽  
Gear Ratio ◽  
Continuously Variable Transmission ◽  
Rolling Contact ◽  
Rolling Contacts ◽  
Variable Transmission ◽  
Toothed Gears

The continuously variable transmission (CVT) is a type of transmission that can adopt any arbitrary gear ratio. Whereas typical transmissions utilize toothed gears, the CVT employs a sphere in rolling contact with a set of rollers; loads applied to the CVT are supported across these rolling contacts, resulting in microslips of varying amounts at each contact area. In this paper, we describe the causes of microslips in the CVT and ways to lessen them through an alternative CVT design.

Mode-mixity-dependent adhesive contact of a sphere on a plane surface

2009 ◽  
Vol 466 (2117) ◽  
pp. 1303-1325 ◽  
Author(s):  
Julie F. Waters ◽  
Pradeep R. Guduru
Keyword(s):  
Contact Area ◽  
Phenomenological Model ◽  
Plane Surface ◽  
Strong Dependence ◽  
Contact Problems ◽  
Work Of Adhesion ◽  
Rigid Sphere ◽  
Mode Mixity ◽  
Normal Loading ◽  
Effective Work

Tangential loading in the presence of adhesion is highly relevant to biological locomotion, but mixed-mode contact of biological materials or similar soft elastomers remains to be well understood. To better capture the effects of dissipation in such contact problems owing to viscoelasticity or irreversible interfacial adhesive processes, a model is developed for the combined adhesive and tangential loading of a rigid sphere on a flat half-space which incorporates a phenomenological model of energy dissipation in the form of increased effective work of adhesion with increasing degree of mode mixity. To verify the model, contact experiments are performed on polydimethylsiloxane (PDMS) samples using a custom-built microtribometer. Measurements of contact area during mixed normal/tangential loading indicate that the strong dependence of the effective work of adhesion upon mode mixity can be captured effectively by the phenomenological model in the regime where the contact area stayed circular and the slip was negligible. Rate effects were seen to be described by a power-law dependence upon the crack front velocity, similar to observations of rate-dependent contact seen for pure normal loading.

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