scholarly journals High-Throughput Measurement of the Contact Resistance of Metal Electrode Materials and Uncertainty Estimation

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2079
Author(s):  
Chao Zhang ◽  
Wanbin Ren
Keyword(s):  
Contact Resistance ◽  
High Throughput ◽  
Electrode Materials ◽  
Mechanical Load ◽  
Potential Drop ◽  
Metal Electrode ◽  
Load Force ◽  
Test Rig ◽  
Contact Potential ◽  
Load Current

Low and stable contact resistance of metal electrode materials is mainly demanded for reliable and long lifetime electrical engineering. A novel test rig is developed in order to realize the high-throughput measurement of the contact resistance with the adjustable mechanical load force and load current. The contact potential drop is extracted accurately based on the proposed periodical current chopping (PCC) method in addition to the sliding window average filtering algorithm. The instrument is calibrated by standard resistors of 1 mΩ, 10 mΩ, and 100 mΩ with the accuracy of 0.01% and the associated measurement uncertainty is evaluated systematically. Furthermore, the contact resistance between standard indenter and rivet specimen is measured by the commercial DMM-based instruments and our designed test rig for comparison. The variations in relative expanded uncertainty of the measured contact resistance as a function of various mechanical load force and load current are presented.

scholarly journals Modeling and Experimental Verification of Material Welding Characteristics for Low Current Switching Devices

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3666
Author(s):  
Xu Zhang ◽  
Wanbin Ren
Keyword(s):  
Thermal Conductivity ◽  
Mechanical Load ◽  
Theoretical Calculations ◽  
Welding Current ◽  
Load Force ◽  
Load Current ◽  
Current Switching ◽  
Metal Materials ◽  
Welding Force ◽  
Switching Devices

Material welding failure considerably influences the electrical lifetime and reliability of low current switching devices. However, relevant studies on methods for calculating the threshold welding current and welding area under milli-Newton scale load forces are very limited. In this paper, the welding characteristics of metal material, including the threshold welding current, welding area and welding force are studied by using theoretical calculations and experiments. The comparison between the theoretical calculation and experimental results shows the accuracy of the built model. Further, the effects of mechanical load force and load current on welding force and welding area of representative metal materials are investigated. It is found that the anti-welding ability of metal materials depends not only on the exerted load force and current, but also the electrical resistivity, the thermal conductivity, the tensile strength, and the melting temperature of the materials.

High throughput identification of Li ion diffusion pathways in typical solid state electrolytes and electrode materials by BV-Ewald method

2019 ◽  
Vol 7 (3) ◽  
pp. 1300-1306 ◽  
Author(s):  
Dajun Chen ◽  
Jianshu Jie ◽  
Mouyi Weng ◽  
Shucheng Li ◽  
Dong Chen ◽  
...  
Keyword(s):  
Solid State ◽  
High Throughput ◽  
Electrode Materials ◽  
Ion Diffusion ◽  
Ewald Method ◽  
Li Ion ◽  
Solid State Electrolytes

A new BV-Ewald method was developed to calculate Li-ion diffusion pathways more quickly and correctly.

Load-Force-Adaptive Outlet Throttling: An Easily Commissionable Independent Metering Control Strategy

2016 ◽  
Author(s):  
Jan Lübbert ◽  
André Sitte ◽  
Benjamin Beck ◽  
Jürgen Weber
Keyword(s):  
Hydraulic System ◽  
Control Algorithm ◽  
Systematic Approach ◽  
Load Force ◽  
Chamber Pressure ◽  
The Novel ◽  
Test Rig ◽  
Mechanical Pressure ◽  
And Control ◽  
Inlet Chamber

This paper deals with a novel independent metering valve system which is intended to be used in medium sized mobile machines. The system uses a mechanical pressure compensator to enable a very simple SISO control algorithm which does not need any feedback parameters to be adjusted. The algorithm is capable of handling resistive and pulling loads at a certain desired velocity and inlet chamber pressure level. The paper gives a brief summary of the systematic approach to deriving the valves structure and compares different control approaches for the complete hydraulic system comprising several actuators. Special emphasis is given to the preferred solution, which is verified on a laboratory test rig consisting of reasonably priced mobile machine components. Furthermore a linear model of system and control structure is constructed to give detailed information regarding the dynamic characteristics of the controlled drive. The energetic benefits of the novel system architecture in comparison to a standard coupled metering flow sharing system are investigated by means of a levelling movement performed on the test rig and a simulated synthetic high power digging cycle.

Characterization of Contact Resistance between Carbon Nanotubes Film and Metal Electrodes

2013 ◽  
Vol 683 ◽  
pp. 238-241
Author(s):  
Ki Bong Han ◽  
Yong Ho Choi
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Contact Resistance ◽  
Chemical Properties ◽  
Metal Electrode ◽  
Metal Contacts ◽  
Metal Electrodes ◽  
3 Dimensional ◽  
Current Path ◽  
Classical Technique

Carbon nanotube has attracted great research attentions due to its outstanding electrical, physical, mechanical, chemical properties. Based on its excellent properties, the carbon nanotube is promising nanoscale material for novel electrical, mechanical, chemical, and biological devices and sensors. However, it is very difficult to control the structure of carbon nanotube during synthesis. A carbon nanotubes film has 3 dimensional structures of interwoven carbon nanotubes as well as unique properties such as transparency, flexibility and good electrical conductivity. More importantly, the properties of carbon nanotubes are ensemble averaged in this formation. In this research, we study the contact resistance between carbon nanotubes film and metal electrode. For most of electrical devices using carbon nanotubes film, it is necessary to have metal electrodes on the film for current path. A resistance at the contact lowers the electrical efficiencies of the devices. Therefore, it is important to measure and characterize the contact resistance and lower it for better efficiencies. The device demonstrated in this study using classical technique for metal contacts provides relatively reliable contact resistance measurements for carbon nanotubes film applications.

scholarly journals Generalized Photo-Thermo-Microstretch Elastic Solid Semiconductor Medium Due To Excitation Process

2021 ◽  
Author(s):  
kh. lotfy ◽  
A. El-Bary
Keyword(s):  
Mechanical Load ◽  
Harmonic Wave ◽  
Plane Waves ◽  
Elastic Solid ◽  
Two Dimensions ◽  
Load Force ◽  
Normal Displacement ◽  
Physical Fields ◽  
Novel Model ◽  
Coupled Stress

Abstract A novel model in the theory of photo-thermoelasticity with microstretch properties is studied. The plasma-elastic-thermal plane waves are propagated in a linear isotropic generalized photo-thermo-microstretch elastic semiconductor solid medium. The photothermal excitation occurs in the context of the microinertia of microelement process during two dimensions (2D) deformation. The harmonic wave techniques are used to get the solutions for the basic variables. The analytical solution of the main physical fields; carrier intensity, normal displacement components, temperature, stress load force, microstress and tangential coupled stress can be obtained. Some graphics illustrated when using the plasma, thermal and mechanical load boundary conditions, which they apply at the outer free surface of the elastic medium. Some semiconductor materials as silicon (Si) and Germanium (Ge) are used to make the numerical simulation and some comparisons in different thermal memories are made. The main physical variables with new parameters are discussed theoretically and shown graphically.

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