A study of the effect of normal stiffness on kinetic friction forces between two bodies in sliding contact

Wear ◽  
1970 ◽  
Vol 16 (1-2) ◽  
pp. 153
Keyword(s):  
Sliding Contact ◽  
Kinetic Friction ◽  
Friction Forces ◽  
Normal Stiffness ◽  
Two Bodies

Design of a tribometer for investigating tactile perception

2014 ◽  
Vol 232 (6) ◽  
pp. 773-784 ◽  
Author(s):  
Francesco Massi ◽  
Eric Vittecoq ◽  
Eric Chatelet ◽  
Aurelien Saulot ◽  
Yves Berthier
Keyword(s):  
External Noise ◽  
Tactile Perception ◽  
Sliding Contact ◽  
Clear Understanding ◽  
Tactile Sense ◽  
Friction Forces ◽  
Low Amplitude ◽  
Finger Skin ◽  
The Brain ◽  
Experimental Test Bench

The understanding of the tactile perception mechanism implies the reproduction and measurement of friction forces and vibrations induced by the contact between the skin of human fingers and object surfaces. When a finger moves to scan the surface of an object, it activates the receptors located under the skin allowing the brain to identify surfaces and information about their properties. The information concerning the object surface is affected by the forces and vibrations induced by the friction between the skin and the rubbed object. The vibrations propagate in the finger skin and are converted into electric impulses sent to the brain by the mechanoreceptors. Because of the low amplitude of the induced vibrations, it results quite hard to reproduce the tactile surface scanning and measuring it without affecting measurements by external noise coming from the experimental test-bench. In fact the reproduction of the sliding contact between two surfaces implies the relative motion between them, which is obtained by appropriate mechanisms having a more or less complicated kinematics and including several sliding surfaces (bearings, sliders, etc.). It results quite difficult to distinguish between the vibrations coming from the reproduced sliding and the parasitic noise coming from the other sliding contact pairs. This paper presents the design and validation of a tribometer, named TRIBOTOUCH, allowing for reproducing and measuring friction forces and friction induced vibrations that are basilar for a clear understanding of the mechanisms of the tactile sense.

Sliding Contact Between Dissimilar Elastic Bodies

1988 ◽  
Vol 110 (4) ◽  
pp. 592-596 ◽  
Author(s):  
A. Sackfield ◽  
D. A. Hills
Keyword(s):  
Elastic Constants ◽  
Carrying Capacity ◽  
Sliding Contact ◽  
Hertzian Contact ◽  
Load Carrying Capacity ◽  
Two Dimensional ◽  
Careful Choice ◽  
Elastic Bodies ◽  
Load Carrying ◽  
Two Bodies

An analysis is presented of the stresses induced by sliding between two bodies having different elastic constants. It is assumed that the bodies are plane (i.e., two dimensional), are symmetrical with respect to a line perpendicular to the plane of contact, and are smooth and continuous. It is shown that a careful choice of profile leads to a better load carrying capacity than for a Hertzian contact, but that the severity of the stresses induced is greater than for uncoupled sliding, i.e., where the bodies have similar elastic constants.

Measurement of Pointwise Juncture Condition of Temperature at the Interface of Two Bodies in Sliding Contact

1963 ◽  
Vol 85 (3) ◽  
pp. 481-485 ◽  
Author(s):  
F. F. Ling ◽  
T. E. Simkins
Keyword(s):  
Experimental Data ◽  
Heat Equation ◽  
Normal Load ◽  
Frictional Resistance ◽  
Flow Fields ◽  
Sliding Contact ◽  
Two Dimensional ◽  
Temperature Distributions ◽  
Typical Data ◽  
Two Bodies

An apparatus is described for bringing a rider specimen and a slider specimen into continuous sliding contact so that significant temperatures at the interface are achievable. The design is such that the flow fields of heat in the specimens would be at most two-dimensional, i.e., within engineering approximations; this fact makes possible the measurement of temperatures of the specimens without disrupting the flow fields of heat. Typical data are presented of speed, normal load, frictional resistance, and temperatures at strategic locations on the specimens. Using the heat-equation solutions obtained previously for the configurations concerned, contact-surface temperature distributions of both specimens are calculated from experimental data. Results give the pointwise, temperature juncture condition at the interface.

scholarly journals Nanoscale Reciprocating Sliding Contact Behaviors of an Isosceles Trapezoid Textured Surface in Space Environment

2020 ◽  
Vol 01 ◽  
Author(s):  
Ruiting Tong ◽  
Zefen Quan ◽  
Geng Liu
Keyword(s):  
Friction Force ◽  
Small Amplitude ◽  
Md Simulation ◽  
Sliding Contact ◽  
Space Environment ◽  
Textured Surface ◽  
Friction Forces ◽  
Reciprocating Sliding ◽  
Frictional Properties ◽  
Isosceles Trapezoid

Background: In space environment, microgravity and vacuum influence the mechanical behaviors of the devices. In microgravity environment, the mechanical components will vibrate with a small amplitude once there is a disturbance. The vibration can be seen as a reciprocating sliding contact with a small amplitude. In addition to the vibration, adhesion effects are predominant in vacuum, which will induce a high friction force. Objective: To reduce the friction force, textured surfaces are widely used in mechanical engineering on the earth, and nanoscale textures are also verified that they can be used to improve the frictional behaviors of components with the size of nanometers. Methods: In this paper, the adhesion effects are considered by using molecular dynamics (MD) simulation, and the microgravity induced vibration is simplified as a reciprocating sliding contact. Coupling MD simulation and the finite element method, a multiscale method is used to investigate the frictional properties of nanoscale reciprocating sliding contact between rigid multi-asperity tips and an isosceles trapezoid textured surface. Results: Average friction forces for the different tips are presented, and the friction processes are analyzed. A stable friction process is discovered for a specific case, and the average friction forces keep at two stable values corresponding to two sliding directions. Conclusion: Compared with the total average friction forces of a smooth surface, the textured surface can reduce the friction forces greatly. This work could contribute to the textured surface design to improve frictional properties in space environment.

The Mechanisms and Manifestations of Friction

2021 ◽  
pp. 13-46
Keyword(s):  
Energy Dissipation ◽  
Rolling Contact ◽  
Sliding Contact ◽  
Operating Environment ◽  
System Effect ◽  
Stick Slip ◽  
Fluid Friction ◽  
Friction Forces ◽  
Friction Laws

Abstract This chapter reviews the types of friction that are of concern in tribological systems along with their associated causes and effects. It discusses some of the early discoveries that led to the development of friction laws and the understanding that friction is a system effect that can be analyzed based on energy dissipation. It describes the stick-slip behavior observed in wiper blades, the concept of asperities, and the significance of the shape, lay, roughness, and waviness of surfaces in sliding contact. It explains how friction forces are measured and how they are influenced by speed, load, and operating environment. It also covers rolling contact and fluid friction and the effect of lubrication.

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