Electric noise in contacts

Holm, Ragnar

doi:10.1007/978-3-662-06688-1_47

Cited by 46 publications

(64 citation statements)

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“…On the other hand, if the radius is much larger than the mean free path length, the resistance is dominated a diffuse scattering mechanism, and is given by the Maxwell spreading resistance formula [10]:…”

Section: Contact Resistancementioning

confidence: 99%

Study of contacts in an electrostatically actuated microswitch

Majumder

McGruer

Adams

et al. 2001

Sensors and Actuators A: Physical

194

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Section: Contact Resistancementioning

confidence: 99%

Study of contacts in an electrostatically actuated microswitch

Majumder

McGruer

Adams

et al. 2001

Sensors and Actuators A: Physical

194

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“…The main reason for using a brush tip with a relatively small cross-section is to achieve a quick run-in period and also to achieve a well-defined a-spot (or cluster of a-spots) electrical contact [34,35].…”

Section: Methodsmentioning

confidence: 99%

Measuring the dynamic forces to identify the friction of a graphite–copper contact for variable temperature and current

Slavič

Boltežar

2006

Wear

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In this paper we present experimental and analytical techniques for identifying the coefficient of friction (COF) of a graphite electric brush sliding against a commutator for different contact temperatures and electric current densities. A direct measurement of the instantaneous dynamic forces is used to identify the coefficient of friction. The experimental example shows that the presented procedures can be used to determine the optimum operating ranges for the temperature and the electric current density.

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“…As can be seen, the widths of wear tracks increase steadily with increasing sliding distance and testing temperature. This can be explained by Holm and Archard's equation as given below [20,21]. During the ball-on-disc tests between aluminium and hardened tool steel at elevated temperatures, it is reasonable to assume the ball material (hardened steel) behaves as a rigid material.…”

Section: Evolution Of Wear Track Widthmentioning

confidence: 99%

Characteristics of the Friction Between Aluminium and Steel at Elevated Temperatures During Ball-on-Disc Tests

et al. 2009

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Appropriate specification of the frictional boundary condition for the finite-element (FE) simulation of metal-forming processes is of great importance to the trustworthiness of the results. The research reported in this communication aimed at understanding the interfacial contact between aluminium and steel at elevated temperatures and determining friction coefficients at this material mating. A series of high-temperature ball-on-disc tests were carried out with the AA7475 aluminium alloy as the material of disc and the hardened H11 steel as the material of ball. A mathematical model developed in the preceding research was employed to account for the evolution of the contact interface during ball-on-disc tests. Friction coefficients at different temperatures and over a number of laps were determined. The shear friction stresses and mean contact pressures along with the progress of the tests at 350-500°C were calculated. It was found that the friction coefficients obtained from ball-on-disc tests alone were insufficient to represent the frictional interaction between deforming aluminium and steel at elevated temperatures. The evolution of the contact interface with increasing sliding distance must be taken into consideration and the friction behaviour can be reasonably characterized by using friction stress.

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Electric noise in contacts

Cited by 46 publications

References 0 publications

Study of contacts in an electrostatically actuated microswitch

Study of contacts in an electrostatically actuated microswitch

Measuring the dynamic forces to identify the friction of a graphite–copper contact for variable temperature and current

Characteristics of the Friction Between Aluminium and Steel at Elevated Temperatures During Ball-on-Disc Tests

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