scholarly journals Resistive-nanoindentation: contact area monitoring by real-time electrical contact resistance measurement

2019 ◽  
Vol 9 (3) ◽  
pp. 1008-1014 ◽  
Author(s):  
Solène Comby-Dassonneville ◽  
Fabien Volpi ◽  
Guillaume Parry ◽  
Didier Pellerin ◽  
Marc Verdier
Keyword(s):  
Contact Resistance ◽  
Real Time ◽  
Contact Area ◽  
Electrical Contact ◽  
Resistance Measurement ◽  
Electrical Contact Resistance ◽  
Image Position ◽  
Area Monitoring

Abstract

Electrical Contact Resistance Estimation With Application to Electric Vehicle Charging Cable

2017 ◽  
Vol 140 (4) ◽  
Author(s):  
Jocelyn Sabatier ◽  
Mathieu Chevrié ◽  
Christophe Farges ◽  
Franck Guillemard ◽  
Laetitia Pradere
Keyword(s):  
Contact Resistance ◽  
Electric Vehicle ◽  
Contact Area ◽  
Electrical Contact ◽  
Heat Rate ◽  
Least Square Method ◽  
Total Heat ◽  
Least Square ◽  
Electrical Contact Resistance ◽  
Charging Infrastructure

The paper proposes a method to estimate the contact resistance inside the outlet between a charging cable and an electric vehicle. First, an electrothermal model of some components close to the contact area inside the vehicle outlet (in the female part of the outlet) and of the harness inside the vehicle is proposed. The charging cable and the associated components are the male parts of the outlet and are not modeled as these components are not identical for each charging. They also depend on the mode and the charging infrastructure used. It is only supposed that the charging cable evacuates an unknown thermal heat rate. A linear approximation of the electrothermal model is then obtained and used to design a closed-loop estimator of the total heat rate at the contact area. Using this information, a least square method is used to estimate the contact resistance that can be deduced from the first values of the total heat rate after a step variation of the current in the charging cable.

A facility for electrical contact resistance measurement

1998 ◽  
Vol 69 (3) ◽  
pp. 1534-1536 ◽  
Author(s):  
H. D. Maheshappa ◽  
J. Nagaraju ◽  
M. V. KrishnaMurthy
Keyword(s):  
Contact Resistance ◽  
Electrical Contact ◽  
Resistance Measurement ◽  
Electrical Contact Resistance

Multiscale Electrical Contact Resistance Between Gas Diffusion Layer and Bipolar Plate in Proton Exchange Membrane Fuel Cells

2012 ◽  
Vol 9 (3) ◽  
Author(s):  
Sunghun Yoo ◽  
Yong Hoon Jang
Keyword(s):  
Contact Resistance ◽  
Diffusion Layer ◽  
Contact Area ◽  
Proton Exchange Membrane ◽  
Electrical Contact ◽  
Gas Diffusion Layer ◽  
Bipolar Plate ◽  
Gas Diffusion ◽  
Proton Exchange ◽  
Electrical Contact Resistance

The contact resistance between gas diffusion layer and bipolar plate in a fuel cell stack is calculated through multiscale contact analysis, which deals with rough surfaces dependent on scales. The rough surface according to scale shows that the surface parameters vary with scale, leading to inaccurate contact resistance. A numerical model is established to reflect the contact interaction of carbon graphite fiber in the contact interface. Two separate analyses are performed, static analysis to determine the contact area and electrical conduction analysis to calculate the electrical contact resistance. Results show that the contact area decreases and the corresponding contact resistance increases as the scale decreases. To accurately estimate the contact resistance, an asymptotic contact resistance according to scale variation is predicted using error analysis. The computed contact resistance is validated via comparison with previously reported values.

Experimental Investigations upon the Electrical Resistance of Microcontacts

2013 ◽  
Vol 705 ◽  
pp. 365-370 ◽  
Author(s):  
Marilena Glovnea ◽  
Cornel Suciu
Keyword(s):  
Contact Resistance ◽  
Contact Area ◽  
Electrical Resistance ◽  
Applied Load ◽  
Electrical Contact ◽  
Constant Current ◽  
Load Force ◽  
Experimental Investigations ◽  
Electrical Contact Resistance ◽  
Force Contact

An important parameter in MEMS design is the electrical contact resistance. This depends on material conductibility, on the geometry of the contacting surfaces, on the applied load and on the current passing through the contact. This work aims to experimentally investigate the dependence between: electrical contact resistance and contact load force, contact resistance and contact area and contact perimeter for constant current through a microcontact.

Electrical Contact Resistance of Electroless Nickel to Nanocrystalline Silicon and the Fabrication of a Thermoelectric Generator

2013 ◽  
Vol 1553 ◽  
Author(s):  
V. Kessler ◽  
M. Dehnen ◽  
R. Chavez ◽  
M. Engenhorst ◽  
J. Stoetzel ◽  
...  
Keyword(s):  
Contact Resistance ◽  
Thermoelectric Generator ◽  
Silicon Nanoparticles ◽  
Electrical Contact ◽  
Electroless Nickel ◽  
Nanocrystalline Silicon ◽  
Electrical Contact Resistance ◽  
Transfer Length ◽  
Chemical Plating ◽  
Image Position

ABSTRACTWe present the fabrication of a high-temperature stable thermoelectric generator based on nanocrystalline silicon. Highly doped silicon nanoparticles were sintered by a current activated sintering technique to get nanocrystalline bulk silicon. The metalization of silicon was realized by (electro-)chemical plating and the specific electrical contact resistance ρc of the semiconductor-metal interface was measured by a transfer length method. Values as low as $\rho _C < 1 \cdot 10^{ - 6} \,\Omega cm^2 $ were measured. The metalized nanocrystalline silicon legs were sintered to metalized ceramic substrates using a silver-based sinter paste. The device figure of merit of the thermoelectric generator was determined by a Harman measurement with a maximum ZT of approximately 0.13 at 600 °C.

Adhesion Analysis for MEMS Based on Electrical Contact Resistance Measurements

2003 ◽  
Author(s):  
L. Kogut ◽  
K. Komvopoulos
Keyword(s):  
Surface Energy ◽  
Contact Resistance ◽  
Contact Area ◽  
Elastic Energy ◽  
Electrical Contact ◽  
Adhesion Energy ◽  
Real Contact Area ◽  
Adhesion Forces ◽  
Electrical Contact Resistance ◽  
Submicron Scale

Because adhesion forces are especially important at the submicron scale, they play a dominant role in several fields of nanotechnology, such as biology, atomic force microscope (AFM) imaging, magnetic disk drives, and microelectromechanical systems (MEMS). The profound importance of adhesion forces in MEMS has been the principal theme of several studies. A common approach for measuring the surface energy is based on balancing the elastic energy stored in microcantilever beams partially adhered to substrates with the work of adhesion, assumed equal to the surface energy multiplied by the apparent area of the attached beam length. However, because the apparent contact area is significantly larger than the real contact area and the elastic energy stored in the deformed asperity microcontacts is neglected, this traditional method may greatly underestimate the interfacial adhesion energy. Consequently, the objective of this study was to develop a method for determining indirectly adhesion forces and adhesion energies form relatively simple in situ electrical contact resistance (ECR) measurements. The method presented herein is based on a theoretical treatment of the ECR encountered during contact of isotropic, conductive, rough surfaces, using multi-scale fractal description of the equivalent surface topography, constitutive contact relations for elastic-perfectly plastic asperity microcontacts, and size-dependent constriction resistance of microcontacts. Results are presented for the adhesion force and adhesion energy in terms of ECR for different surface topographies.

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