Experimental Study of a Creeping Polymer Sphere in Contact With a Rigid Flat

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
A. Ovcharenko ◽  
G. Halperin ◽  
I Etsion
Keyword(s):  
Experimental Study ◽  
Contact Area ◽  
Normal Load ◽  
Dimensionless Time ◽  
Sphere Diameter ◽  
Polymer Sphere ◽  
Constant Normal Load ◽  
Different Diameters ◽  
Theoretical Results

The creep of a polymer sphere contacting a rigid flat under a constant normal load is investigated experimentally. An optical technique is used to observe in situ the evolution of the contact area while the increase of contact interference is measured simultaneously. The experimental results obtained with polytetrafluoroethylene (PTFE) spheres of different diameters pressed against a sapphire flat under different normal loads are presented, and the effect of sphere diameter and normal load on the creep of the contact parameters is discussed. The present experimental study validates recently published theoretical results of a contact model for a creeping sphere and a rigid flat showing that a universal similarity solution exists for the dimensionless creep interference and dimensionless creep contact area as functions of the dimensionless time.

Experimental Study of a Creeping Polymer Sphere in Contact With a Rigid Flat

2008 ◽  
Author(s):  
Andrey Ovcharenko ◽  
Gregory Halperin ◽  
Izhak Etsion
Keyword(s):  
Experimental Study ◽  
Contact Area ◽  
Normal Load ◽  
Dimensionless Time ◽  
Sphere Diameter ◽  
Polymer Sphere ◽  
Constant Normal Load ◽  
Different Diameters ◽  
Theoretical Results

The creep of a polymer sphere contacting a rigid flat under a constant normal load is investigated experimentally. An optical technique is used to observe in situ the evolution of the contact area while the increase of contact interference is measured simultaneously. The experimental results obtained with PTFE spheres of different diameters pressed against a sapphire flat under different normal loads are presented and the effect of sphere diameter and normal load on the creep of the contact parameters is discussed. The present experimental study validate recently published theoretical results of a contact model for a creeping sphere and a rigid flat showing that a universal similarity solution exists for the dimensionless creep interference and dimensionless creep contact area as functions of the dimensionless time.

scholarly journals An experimental study on the relation between friction force and real contact area

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
X. M. Liang ◽  
Y. Z. Xing ◽  
L. T. Li ◽  
W. K. Yuan ◽  
G. F. Wang
Keyword(s):  
Experimental Study ◽  
Friction Force ◽  
Contact Area ◽  
Linear Relation ◽  
Normal Load ◽  
Real Contact Area ◽  
Normal Loading ◽  
Real Contact ◽  
Loading And Unloading ◽  
Nominal Contact Area

AbstractClassical laws of friction suggest that friction force is proportional to the normal load and independent of the nominal contact area. As a great improvement in this subject, it is now widely accepted that friction force is proportional to the real contact area, and much work has been conducted based on this hypothesis. In present study, this hypothesis will be carefully revisited by measuring the friction force and real contact area in-site and real-time at both normal loading and unloading stages. Our experiments reveal that the linear relation always holds between friction force and normal load. However, for the relation between friction force and real contact area, the linearity holds only at the loading stage while fails at the unloading stage. This study may improve our understanding of the origin of friction.

scholarly journals Does Linearity Always Hold between Friction Force and Real Contact Area: An Experimental Study

2021 ◽  
Author(s):  
Xuan Ming Liang ◽  
Yuzhe Xing ◽  
Leitao Li ◽  
Weike Yuan ◽  
G.F. Wang
Keyword(s):  
Experimental Study ◽  
Friction Force ◽  
Contact Area ◽  
Normal Load ◽  
Real Contact Area ◽  
Normal Loading ◽  
Real Contact ◽  
Loading And Unloading ◽  
Nominal Contact Area ◽  
Real Area

Classical laws of friction suggest that friction force is proportional to the normal load and independent of the nominal contact area. As a great improvement in this subject, it is now widely accepted that friction force is proportional to the real area in contact, and much work has been conducted based on this hypothesis. In present study, this hypothesis will be carefully revisited by measuring the friction force and real contact area in-site and real-time at both normal loading and unloading stages. Our experiments reveal that the linear relation always holds between friction force and normal load. However, for the relation between friction force and real contact area, the linearity holds only at the loading stage while fails at the unloading stage. This study may improve our understanding of the origin of friction.

EXPERIMENTAL STUDY OF IN SITU REMEDIATION OF LOW PERMEABILITY SOILS BY BIOVENTING

2018 ◽  
Vol 17 (11) ◽  
pp. 2645-2656
Author(s):  
Christos D. Tsakiroglou ◽  
Dimitra N. Tzovolou
Keyword(s):  
Experimental Study ◽  
Low Permeability ◽  
In Situ Remediation

Experimental study on the cutting responses and surface integrity of side milled in situ TiB2/Al composites

2021 ◽  
Vol 113 (1-2) ◽  
pp. 321-335
Author(s):  
Zhenyu Zuo ◽  
Jie Chen ◽  
Weiwei Yu ◽  
Yugang Li ◽  
Dong Chen ◽  
...  
Keyword(s):  
Experimental Study ◽  
Surface Integrity
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