Objective and Combinational Analysis of Multiple Kinds of Data Obtained from Severe-Mild Wear Transition

2015 ◽  
Vol 1112 ◽  
pp. 345-348
Author(s):  
Kanao Fukuda ◽  
Takehiro Morita
Keyword(s):  
Adhesive Wear ◽  
Electrical Contact ◽  
Analysis Method ◽  
Electrical Contact Resistance ◽  
Mild Wear ◽  
Key Factor ◽  
Combinational Analysis ◽  
Sliding Test ◽  
Pin On Disk ◽  
Wear Transition

The authors have been developing objective and combinational analysis method for multiple kinds of data obtained by a repeated sliding test performed with a pin-on-disk apparatus to clarify the wear mechanisms. The developed analysis method successfully showed the growth rate and the size of adhered substances on the sliding surface for adhesive wear mechanism. In this paper, the developed method was applied for analyzing chronological changes in severe-mild wear forms transition to understand the phenomena more quantitatively. Friction force, pin specimen displacement perpendicular to the slid surface and electrical contact resistance between pin and disk specimens were employed as the multiple kinds of data. The devised analysis showed that the formation of a plateau with around 25 μm height on the slid surface is a key factor for the transition.

Effect of Reciprocal Sliding on Severe-Mild Wear Transition

2005 ◽  
Author(s):  
K. Hiratsuka ◽  
H. Sayama ◽  
B. Prakash
Keyword(s):  
Adhesive Wear ◽  
Operating Parameters ◽  
Wear Particles ◽  
Sliding Velocity ◽  
Test Rig ◽  
Test Configuration ◽  
Mild Wear ◽  
Wear Mode ◽  
Wear Transition

It is well known that adhesive wear is strongly dependent on load, sliding velocity, temperature and several other operating parameters. Besides these parameters, test configuration and type of motion also significantly affect the wear mode. For example, severe-mild wear transition is strongly dependent on the orientation of a test rig and the possibility of retention of wear particles on rubbing surface. It has earlier been shown that the retention of mild wear particles is crucial for severe-mild wear transition [1].

Sliding Characteristics in the Copper Contacts

1993 ◽  
Vol 5 (3) ◽  
pp. 292-298
Author(s):  
Yoshitada Watanabe ◽  
Keyword(s):  
Contact Resistance ◽  
Coefficient Of Friction ◽  
Heat Generation ◽  
Electrical Contact ◽  
Rotational Frequency ◽  
Contact Spot ◽  
Electrical Contact Resistance ◽  
The Coefficient Of Friction ◽  
Contact Surfaces ◽  
Sliding Test

A low rotational frequency sliding tester which could measure electrical contact resistance and coefficient of friction simultaneously was trially fabricated. Relations between electrical contact resistance and coefficients of friction were investigated by making sliding test on clean copper and surface oxidized copper contacts respectively, which were used relatively frequently in industries. As far as the measurement work made this time, of which rotational frequency was low, was concerned, it was found that the heat generation due to mechanical friction was low and the heat generation due to Joule's heat in the case of sliding clean contact surfaces was also low because of low contact resistance. It was, however, found that CU²0, etc. were formed due to rapid progress of oxidation by the generation of Joule's heat at the contact surfaces, of which real contact areas were extremely small, being roughened along with the increase of the sliding frequency. On the other hand, it was further found that although the existence of oxides in advance at the sliding surface extremely lowered the coefficient of friction (0.07 for example) in which the oxidized film indicating contrarily (70mΩ for example). It was presumed that formations and destroys of oxidation film were repeated by flow of electric current at the contact spot to cause Fritting Phenomenon.

An Investigation of Dry Adhesive Wear

1959 ◽  
Vol 81 (1) ◽  
pp. 56-65 ◽  
Author(s):  
R. P. Steijn
Keyword(s):  
Wear Rate ◽  
Adhesive Wear ◽  
Film Formation ◽  
Electrical Contact ◽  
Surface Oxidation ◽  
Hard Material ◽  
Electrical Contact Resistance ◽  
Sliding Motion ◽  
Wear Tests ◽  
Made In

Sliding-motion experiments under unlubricated conditions have been carried out on various metals, and the results are discussed in terms of the simple wear theory advanced by Archard. Oxide-film formation has been studied by electrical contact-resistance measurements made in conjunction with wear tests. The effects on the wear rate and basic wear formula are discussed. For the ring apparatus, a modified expression for the wear formula is suggested to incorporate surface oxidation. Although it was found that the sliding of a soft material on a hard material follows simple wear rules, discrepancies are reported for the wear of brass against brass. In these experiments, the wear rate is affected by the geometry of the apparent area of contact.

New Methodologies Indicating Adhesive Wear in Load Step Tests on the Translatory Oscillation Tribometer

Lubricants ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 101
Author(s):  
Gregor Patzer ◽  
Mathias Woydt
Keyword(s):  
Coefficient Of Friction ◽  
Adhesive Wear ◽  
Electrical Contact ◽  
Power Input ◽  
Load Carrying Capacity ◽  
Electrical Contact Resistance ◽  
Zero Position ◽  
Load Carrying ◽  
The Coefficient Of Friction ◽  
New Methodologies

When looking in detail at analyses of the tribological load-carrying capacity of lubricants, it becomes apparent that an exclusive evaluation of the evolution of the coefficient of friction alone cannot provide any sufficient criteria for determining the occurrence of adhesive failure. For this reason, extending the knowledge base by combining several criteria in order to draw a clearer picture of adhesive wear mechanisms is urgently required. This can be achieved by combining the evolution of coefficient of friction with stroke signals and/or the electrical contact resistance and/or contact temperature and/or acoustic emission and/or stroke zero position, frictional power input and further derived parameters.

scholarly journals Comparison of reliability evaluation methods between China and Canada standards for wood structures featuring duration of load

2020 ◽  
Vol 66 (1) ◽  
Author(s):  
Qiongyao Wu ◽  
Shuang Niu ◽  
Enchun Zhu
Keyword(s):  
Reliability Analysis ◽  
Analysis Method ◽  
Safety Level ◽  
Wood Structures ◽  
Load Effect ◽  
Key Factor ◽  
Live Loads ◽  
High Level ◽  
Partial Factor ◽  
Duration Of Load

Abstract Duration of load (DOL) is a key factor in design of wood structures, which makes the reliability analysis of wood structures more complicated. The importance of DOL is widely recognized, yet the methods and models through which it is incorporated into design codes vary substantially by country/region. Few investigations of the effect of different model assumptions of DOL and other random variables on the results of reliability analysis of wood structures can be found. In this paper, comparisons are made on the reliability analysis methods that underlie the China and the Canada standards for design of wood structures. Main characteristics of these two methods, especially the way how DOL is treated are investigated. Reliability analysis was carried out with the two methods employing the same set of material properties and load parameters. The resulted relationships between reliability index β and resistance partial factor γR* (the β–γR* curves) for four load combinations are compared to study the safety level indicated by the two methods. The comparison shows that the damage accumulation model (Foschi–Yao model) in the Canada analysis method is highly dependent on the type and duration of load, resulting in more conservative design than the China analysis method in loading cases dominated by dead load, but less conservative design in cases of high level of live loads. The characteristics of the load effect term of the performance function are also found to make considerable difference in reliability levels between the two methods. This study aims to provide references for researchers and standard developers in the field of wood structures.

scholarly journals The Route for Ultra-High Recording Density Using Probe-Based Data Storage Device

NANO ◽  
2015 ◽  
Vol 10 (08) ◽  
pp. 1550118 ◽  
Author(s):  
Lei Wang ◽  
Jing Wen ◽  
CiHui Yang ◽  
Shan Gai ◽  
YuanXiu Peng
Keyword(s):  
Phase Change ◽  
Data Storage ◽  
Electrical Contact ◽  
Crystal Nucleation ◽  
Access Time ◽  
Storage Device ◽  
Electrical Contact Resistance ◽  
Low Energy Consumption ◽  
Modeling Techniques ◽  
Second Period

Phase-change probe memory using Ge2Sb2Te5 has been considered as one of the promising candidates as next-generation data storage device due to its ultra-high density, low energy consumption, short access time and long retention time. In order to utmostly mimic the practical setup, and thus fully explore the potential of phase-change probe memory for 10 Tbit/in2 target, some advanced modeling techniques that include threshold-switching, electrical contact resistance, thermal boundary resistance and crystal nucleation-growth, are introduced into the already-established electrothermal model to simulate the write and read performance of phase-change probe memory using an optimal media stack design. The resulting predictions clearly demonstrate the capability of phase-change probe memory to record 10 Tbit/in2 density under pico Joule energy within micro second period.

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