Validation of Finite Element Structural Simulation for Ohmic Microcontact

Liu, Hong; Leray, Dimitri; Pons, Patrick; Colin, Stéphane; Broué, Adrien; Martegoutte, Julien

doi:10.1016/j.proeng.2011.12.104

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…However, according to the mechanical simulations, the contact radius is about 100 nm at 145 µN [32]. Since the mechanical simulations have been validated to be capable of predicting the contact mechanical behavior [35], it is likely that the discord on the contact radius, calculated by the mechanical simulations and the experimental resistances, comes from the insulating film on the contact surface, the modeling work on this concept will be presented in the following paper. A series of simulations were conducted to examine the impacts of three parameters in the 3-D model, namely, radius, asperity angle and height.…”

Section: Comparison Againt the Experimental Resultsmentioning

confidence: 99%

An Asperity-Based Finite Element Model for Electrical Contact of Microswitches

Liu

Leray

Pons

et al. 2013

2013 IEEE 59th Holm Conference on Electrical Contacts (Holm 2013)

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Abstract-Precise prediction of electrical contact resistance is important for microswitches. The contact spot used to be considered as a circle in earlier literature, where there was only one geometrical parameter: the radius of the a-spots. However, a real contact asperity has a height and an angle with the interface. In this paper, a 3-dimensional cone-truncated geometry is used to model an asperity, and three parameters are defined: radius, height and the angle of the side with respect to the surface plane. The ranges of their values are extracted from AFM measurement of samples in Au and Ru, and the values match well with the previous mechanical simulation results.Compared to the theoretical results, the finite element (FE) model showed a good capability to predict contact resistance in the diffusive regime, but underestimated it in the ballistic regime. The effects of angle and height of the asperity were investigated for Au-Ru contact in terms of contact resistance, maximum temperature and its location. Regarding multiple spots in contact, this work investigated the influence of the number of spots and their distributions for contact resistance and local Joule heating.

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Section: Comparison Againt the Experimental Resultsmentioning

confidence: 99%

An Asperity-Based Finite Element Model for Electrical Contact of Microswitches

Liu

Leray

Pons

et al. 2013

2013 IEEE 59th Holm Conference on Electrical Contacts (Holm 2013)

Self Cite

View full text Add to dashboard Cite

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Mathematical model of the distribution of electrical and thermal energy in the working element of an information and measurement system designed to study the process of initiating industrial explosives

Krivchenko

Nechaev

Moshchenskij

et al. 2021

J. Phys.: Conf. Ser.

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The use of sensitive explosives to detonate the main charge during perforation of solid rock layers, demolition of high-rise and strong structures, etc. is an inconvenient and dangerous method of initiation. This makes it urgent to develop and implement alternative methods for detonating explosives. One of these methods is to transmit a thermal pulse of the required power using thermal conductivity from a metal rod to an explosive. The determination of the thermal power of the pulse required for the occurrence of detonation is carried out by indirect measurements. The rating allocated by standard heat rod method is pretty rude, does not account for losses at the points of contact and spatial distribution of heat in the core, depending on the electric pulse parameters. In this paper, mathematical models of the formation of a thermal field in the rod, taking into account these factors, are constructed. Based on the results of the obtained models, numerical calculations are made for rods of different sizes and signals of different shapes and power. The results of the work allow us to determine the necessary initial and boundary conditions for a further description of fast-flowing thermal processes.

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Validation of Finite Element Structural Simulation for Ohmic Microcontact

Cited by 2 publications

References 6 publications

An Asperity-Based Finite Element Model for Electrical Contact of Microswitches

An Asperity-Based Finite Element Model for Electrical Contact of Microswitches

Mathematical model of the distribution of electrical and thermal energy in the working element of an information and measurement system designed to study the process of initiating industrial explosives

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