Effect of temperature on single asperity contact and separation in Au

2007 ◽  
Vol 57 (9) ◽  
pp. 885-888 ◽  
Author(s):  
Jun Song ◽  
David J. Srolovitz
Keyword(s):  
Effect Of Temperature ◽  
Asperity Contact ◽  
Single Asperity ◽  
Single Asperity Contact

Contact Mechanics of Rough Surfaces in Tribology: Single Asperity Contact

1996 ◽  
Vol 49 (5) ◽  
pp. 275-298 ◽  
Author(s):  
Bharat Bhushan
Keyword(s):  
Friction And Wear ◽  
Rough Surfaces ◽  
Asperity Contact ◽  
Elastic Solids ◽  
Elastic Plastic ◽  
Single Asperity ◽  
Real Area Of Contact ◽  
Single Asperity Contact ◽  
Indentation Problem ◽  
Real Area

Contact modeling of two rough surfaces under normal approach and with relative motion is carried out to predict the real area of contact which affects friction and wear of an interface. The contact of two macroscopically flat bodies with microroughness is reduced to the contact at multiple asperities of arbitrary shapes. Most of deformation at the asperity contact can be either elastic or elastic-plastic. In this paper, a comprehensive review of modeling of a single asperity contact or an indentation problem is presented. Contact analyses for a spherical asperity/indenter on homogeneous and layered, elastic and elastic-plastic solids with and without tangential loading are presented. The analyses reviewed in this paper fall into two groups: (a) analytical solutions, primarily for elastic solids and (b) finite element solutions, primarily for elastic-plastic problems and layered solids. Implications of these analyses in friction and wear are discussed.

Transitions of Shear Resistance in a Single-Asperity Contact

1998 ◽  
Vol 539 ◽  
Author(s):  
J. A. Hurtado ◽  
K.-S. Kim
Keyword(s):  
Contact Zone ◽  
Shear Force ◽  
Friction Stress ◽  
Adhesive Contact ◽  
Nanometer Scale ◽  
Asperity Contact ◽  
Normal Loading ◽  
Single Asperity ◽  
Single Asperity Contact ◽  
Contact Size

AbstractThe shear force required to emit circular dislocation loops from the edge of a circular adhesive-contact zone is calculated analytically as a function of contact-zone radii. The emission condition is based on the balance of the configurational force and the Peierls force on a dislocation loop initiated at the edge of the adhesive contact zone. The analysis suggests that there is a transition, for a nanometer-scale single-asperity contact, from concurrent (mobile- dislocation-free) slip to single-dislocation-assisted (SDA) slip. The nanometer-scale friction stress (shear force required for slip/contact area), which experimentally is observed independent of normal loading and contact-zone size, is believed to be the stress required for concurrent slip. The analysis also predicts a second transition from SDA slip to multiple-dislocation-cooperated (MDC) slip at the scale of tens of micrometers in contact size. The friction stress at this large length scale has also been observed experimentally to be independent of normal loading and contact size; however, the friction stress at the nanometer scale is about 30 times that at the scale of tens of micrometers. The analysis is consistent with these experimental observations.

Pre-sliding Behaviour of Single Asperity Contact

2013 ◽  
Vol 49 (3) ◽  
pp. 553-562 ◽  
Author(s):  
M. A. Yaqoob ◽  
A. Winogrodzka ◽  
H. R. Fischer ◽  
E. R. M. Gelinck ◽  
M. B. de Rooij ◽  
...  
Keyword(s):  
Asperity Contact ◽  
Single Asperity ◽  
Single Asperity Contact

Molecular dynamics simulation of single asperity contact

2004 ◽  
Vol 52 (13) ◽  
pp. 3983-3996 ◽  
Author(s):  
Pil-Ryung Cha ◽  
David J Srolovitz ◽  
T Kyle Vanderlick
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Dynamics Simulation ◽  
Asperity Contact ◽  
Single Asperity ◽  
Single Asperity Contact

scholarly journals Study of wear particles formation at single asperity contact: An experimental and numerical approach

Wear ◽  
2021 ◽  
Vol 470-471 ◽  
pp. 203644
Author(s):  
M.A. Mekicha ◽  
M.B. de Rooij ◽  
T. Mishra ◽  
D.T.A. Matthews ◽  
L. Jacobs ◽  
...  
Keyword(s):  
Numerical Approach ◽  
Asperity Contact ◽  
Wear Particles ◽  
Single Asperity ◽  
Single Asperity Contact

A FEM Based Multiple Asperity Deterministic Contact Model

2009 ◽  
Author(s):  
A. Megalingam ◽  
M. M. Mayuram
Keyword(s):  
Friction And Wear ◽  
Statistical Approach ◽  
Present Model ◽  
Contact Model ◽  
Real Contact Area ◽  
Clear Understanding ◽  
Asperity Contact ◽  
Single Asperity ◽  
Contact Models ◽  
Single Asperity Contact

Knowledge of contact stresses generated when two surfaces are in contact play a significant role in understanding most mechanisms of friction and wear. Most of present contact models are based on the Greenwood-Williamson (GW) single asperity contact model and a statistical approach is adopted to calculate the real contact area for the entire surface based on the assumption that all the summits have uniform radius of curvatures and their heights vary randomly. But in real cases, the asperity radii vary. For a clear understanding about those aspects, a multiple asperity contact model, based on 3-D rough surface generated is analyzed using a commercial FEM package. Salient aspects of the present model are presented here and results are compared with a single asperity contact model.

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