scholarly journals Numerical Modeling of Electrical Contact Conductance of Rough Bodies

2015 ◽  
Vol 15 (01) ◽  
Author(s):  
Mikhail Murashov ◽  
Sergey Panin ◽  
Sergey Klimov
Keyword(s):  
Numerical Modeling ◽  
Electrical Contact ◽  
Contact Conductance

scholarly journals Determination of Nonconductive Coating Thickness Using Electrical Contact Conductance and Surface Profile

Coatings ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 310 ◽  
Author(s):  
Kyungmok Kim ◽  
Jaewook Lee
Keyword(s):  
Coating Thickness ◽  
Electrical Contact ◽  
Surface Profile ◽  
Steel Specimen ◽  
Vertical Displacement ◽  
Relative Displacement ◽  
Optical Microscope ◽  
Electrical Contact Resistance ◽  
Contact Conductance

This paper describes a method to determine the thickness of a nonconductive coating by identifying the transition of material by a change in electrical properties. A slide-hold-slide test was conducted with a worn specimen including an electrodeposited coating layer. Relative displacement was imposed between a metallic stylus tip and a worn steel specimen. After an initial sliding, the tip was held for a certain time to measure electrical contact resistance. During the test, the vertical displacement of the stylus tip was also recorded to draw a surface profile of the worn specimen. Coating thickness on the specimen was determined with a surface profile at the transition of electrical contact conductance. Optical cross-section measurement of the specimen was applied to identify actual coating thickness. Measured results reveal that calculated coating thicknesses are in good agreement with measured values by an optical microscope. The proposed method allows determination of both nonconductive coating thickness and surface profile in a single measurement.

scholarly journals Numerical Study of Coupled Electrical-Thermal-Mechanical-Wear Behavior in Electrical Contacts

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 955
Author(s):  
Fei Shen ◽  
Liao-Liang Ke
Keyword(s):  
Contact Pressure ◽  
Contact Stress ◽  
Electrical Contact ◽  
Numerical Approach ◽  
Electrical Contacts ◽  
Fretting Wear ◽  
Wear Depth ◽  
Surface Geometry ◽  
Contact Conductance ◽  
Mechanical Wear

Electrical contacts involve complicated electrical, thermal, and mechanical phenomena. Fretting wear as a surface damage mechanism significantly weakens the performance of electrical contact components. In this study, a numerical approach is developed to investigate the electrical-thermal-mechanical-wear coupling behavior of electrical contacts. An electrical contact conductance law is used with the current conservation model to evaluate the electrical behavior. A transient heat transfer model, including the Joule heating behavior and a thermal contact conductance law, is employed to calculate the temperature field. Both contact conductance laws are related to the contact pressure distribution obtained by the contact stress analysis. Based on the predicted contact stress and relative slip on contact surfaces, the energy wear model is used to study the evolution of fretting wear depth and contact surface geometry. The material properties in these models are temperature-dependent. The proposed numerical approach is implemented in a finite element modeling of electrical contacts, which is validated by comparing the predicted and experimental results of the wear scar profile. The effects of the fretting wear on the electric potential, current density, contact resistance, temperature, and contact pressure are numerically studied.

New Apparatus for Characterizing Electrical Contact Resistance and Thermal Contact Conductance

2011 ◽  
pp. 1003-1008
Author(s):  
Nedeltcho Kandev ◽  
Hugues Fortin ◽  
Sylvain Chénard ◽  
Guillaume Gauvin ◽  
Marie-Hélène Martin ◽  
...  
Keyword(s):  
Contact Resistance ◽  
Thermal Contact ◽  
Electrical Contact ◽  
Thermal Contact Conductance ◽  
Electrical Contact Resistance ◽  
Contact Conductance ◽  
New Apparatus

New Apparatus for Characterizing Electrical Contact Resistance and Thermal Contact Conductance

2011 ◽  
pp. 1003-1008 ◽  
Author(s):  
Nedeltcho Kandev ◽  
Hugues Fortin ◽  
Sylvain Chénard ◽  
Guillaume Gauvin ◽  
Marie-Hélène Martin ◽  
...  
Keyword(s):  
Contact Resistance ◽  
Thermal Contact ◽  
Electrical Contact ◽  
Thermal Contact Conductance ◽  
Electrical Contact Resistance ◽  
Contact Conductance ◽  
New Apparatus

Epitaxial ferroelectric thin films

1994 ◽  
Vol 52 ◽  
pp. 572-573
Author(s):  
S. G. Ghonge ◽  
E. Goo ◽  
R. Ramesh ◽  
R. Haakenaasen ◽  
D. K. Fork
Keyword(s):  
Single Crystal ◽  
Work Function ◽  
Nonvolatile Memory ◽  
Ferroelectric Properties ◽  
Electrical Contact ◽  
Memory Devices ◽  
Ferroelectric Films ◽  
Si Substrates ◽  
Electro Optic ◽  
Wide Range

Microstructure of epitaxial ferroelectric/conductive oxide heterostructures on LaAIO3(LAO) and Si substrates have been studied by conventional and high resolution transmission electron microscopy. The epitaxial films have a wide range of potential applications in areas such as non-volatile memory devices, electro-optic devices and pyroelectric detectors. For applications such as electro-optic devices the films must be single crystal and for applications such as nonvolatile memory devices and pyroelectric devices single crystal films will enhance the performance of the devices. The ferroelectric films studied are Pb(Zr0.2Ti0.8)O3(PLZT), PbTiO3(PT), BiTiO3(BT) and Pb0.9La0.1(Zr0.2Ti0.8)0.975O3(PLZT).Electrical contact to ferroelectric films is commonly made with metals such as Pt. Metals generally have a large difference in work function compared to the work function of the ferroelectric oxides. This results in a Schottky barrier at the interface and the interfacial space charge is believed to responsible for domain pinning and degradation in the ferroelectric properties resulting in phenomenon such as fatigue.

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