Coefficient of Friction Measurement in the Presence of High Current Density

Brown, Lloyd; Xu, Dong-Hui; Ravi‐Chandar, Krishnaswamy; Satapathy, S.

doi:10.1109/tmag.2006.887697

Cited by 27 publications

(9 citation statements)

References 3 publications

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“…Many researchers have calculated and simulated the frictional heat on the contact surface of the armature and rails, and some results show that the effect of frictional heat is not all unfavorable, high-speed friction will increase the contact area to reduce the contact resistance, and frictional heat will accelerate the surface melting to play a lubricating role on the contact interface. L Brown in the literature [28] studied the armature and rails friction model under micro-scale and high current, and the friction coefficients were measured experimentally. The experimental data suggest that the friction coefficient may decrease in the presence of high currents on the contact surfaces.…”

Section: Thermal Effects and Temperature Field Distribution Character...mentioning

confidence: 99%

A review of static/quasi-static calculations of Electromagnetic-thermal coupling sliding electrical contact characteristics of armature and rails

2023

J. Phys.: Conf. Ser.

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The analysis of the sliding electrical contact characteristics between the armature and rails is an important research area for electromagnetic railguns. In this paper, a sliding electrical contact model considering non-ideal factors is introduced, the magneto-thermal coupling characteristics of the contact interface are summarized, and the current and temperature distribution characteristics are outlined. In the end, measures that can be taken to improve the contact performance are presented in terms of armature rail material selection and structural optimization.

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Section: Thermal Effects and Temperature Field Distribution Character...mentioning

confidence: 99%

A review of static/quasi-static calculations of Electromagnetic-thermal coupling sliding electrical contact characteristics of armature and rails

2023

J. Phys.: Conf. Ser.

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“…The friction coefficient between armature and rails in ERL decreases by approximately 50% in the case of high current density (> 10 10 A/m 2 ), and is not more than 0.12 [24]. Therefore, the sliding friction coefficients are taken as 0, 0.04, 0.08, and 0.12 in this paper.…”

Section: Thermal Analysis In Three Type Rails By Channel Coolingmentioning

confidence: 99%

“…T at t pe , µ, and t meet the following formula T = 6.5+43.7µ+0.17t +25µ 2 − 0.002t 2 +6.3µt (24) T at t se , µ, and t can be fitted into equation as follow…”

Section: B Spatial and Temporal Distribution Characteristics Of Railmentioning

confidence: 99%

Thermal Analysis in Electromagnetic Rail Launcher Taking Friction Heat into Account Under Active Cooling Condition

et al. 2020

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A high-efficiency thermal management system is one of the key points in the practical application of electromagnetic rail launcher (ERL). In this paper, the thermal characteristics in ERL with the section of rectangle, convex, and concave rails by active cooling under different friction coefficient condition are investigated. By two cooling approaches, at two launch rates, with four friction coefficients, peak temperature in convex rails at the same moment is minimum in three types rails. Joule heat dominates in three shapes rail by channel or surface/channel cooling approach, but friction heat is a nonnegligible part under multiple launching mode. The spatial and temporal distribution features of peak temperature of three shapes rail with different friction coefficient under active cooling condition are compared. The mathematical relations between friction coefficient, time and temperature rising caused by friction at pulse end time and shot end moment in ERL with the three types rail are obtained, respectively. In terms of obtaining lower maximal temperature in rail, the ERL with convex rails is the best one. INDEX TERMS Thermal analysis, electromagnetic rail launcher, friction heat, active cooling.

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“…A modified version of a mesoscale friction tester apparatus was used [1], [2]. The mesoscale friction tester can probe scales between those of the atomic force microscope and surface force apparatus for contact forces between 10 −6 and 10 −3 N and contact radii between 10 −8 and 10 −5 m. In the mesoscale friction tester, a copper or tungsten probe tip is cold welded to a cantilever beam made of a thin stainless steel strip.…”

Section: Experimental Workmentioning

confidence: 99%

Studies of Asperity-Scale Plasma Discharge Phenomena

Albright

Raja

Manley

et al. 2011

IEEE Trans. Plasma Sci.

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A combined experimental and computational simulation study of direct-current plasma discharge phenomena in small-length-scale geometries (< 10 µm) is described. The primary goal is to study discharge breakdown characteristics in small-length-scale geometries as quantified by a modified Paschen breakdown curve and the quench characteristics in these discharges. A modified mesoscale friction tester apparatus is used for the experiments. A self-consistent nonequilibrium plasma model is used for the simulation studies. The model includes field-emission effects, which is a key process in determining small-length-scale breakdown behavior. The breakdown and quench curves obtained from the experiments and simulations showed the same general trends. Quantification of the heat fluxes from the simulations shows higher erosion at the cathode and a highly nonlinear heating behavior with applied overvoltages above the breakdown threshold.Index Terms-Electrical breakdown, electrical contact at asperity scale, microdischarge, Paschen curve.

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Coefficient of Friction Measurement in the Presence of High Current Density

Cited by 27 publications

References 3 publications

A review of static/quasi-static calculations of Electromagnetic-thermal coupling sliding electrical contact characteristics of armature and rails

A review of static/quasi-static calculations of Electromagnetic-thermal coupling sliding electrical contact characteristics of armature and rails

Thermal Analysis in Electromagnetic Rail Launcher Taking Friction Heat into Account Under Active Cooling Condition

Studies of Asperity-Scale Plasma Discharge Phenomena

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