scholarly journals On the Role of Contact and System Stiffness in the Measurement of Principal Variables in Fretting Wear Testing

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4152 ◽  
Author(s):  
Diego Infante-García ◽  
Miguel Marco ◽  
Alaitz Zabala ◽  
Farshad Abbasi ◽  
Eugenio Giner ◽  
...  
Keyword(s):  
Contact Stiffness ◽  
Fretting Wear ◽  
Displacement Sensor ◽  
Wear Testing ◽  
Sensor Calibration ◽  
Tangential Contact ◽  
Contact Configuration ◽  
Wear Tests ◽  
Flat Contact

In this work, the role of the contact stiffness in the measurement of principal variables in fretting wear tests is assessed. Several fretting wear tribometers found in the literature, including one developed by the authors, are analysed and modelled using numerical methods. The results show the importance of the tribosystem stiffness and tangential contact stiffness in the displacement sensor calibration and in the correct numerical modelling of fretting wear tests, especially for flat-to-flat contact configuration. The study highlights that, in most cases, direct comparisons between fretting results with severe wear obtained with different tribometers cannot be performed if the contact stiffness is not properly considered during the development of the experiments.

Composite Fretting Wear of Aluminum Alloy

2007 ◽  
Vol 353-358 ◽  
pp. 868-873 ◽  
Author(s):  
Min Hao Zhu ◽  
Zhong Rong Zhou
Keyword(s):  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Relative Motion ◽  
Wear Mechanism ◽  
Normal Force ◽  
Fretting Wear ◽  
Test Results ◽  
Contact Configuration ◽  
Inclined Angle ◽  
Flat Contact

A complex relative motion of fretting combined by dual motions of radial and tangential fretting was achieved on a modified fretting tester. The composite fretting motion was induced by the action of an oscillating normal force in a sphere-on-inclined flat contact (52100 steel ball against 2091 aluminum alloy). Two types of inclined angles (45° and 60°) were used in the tests. Variations of veridical force vs displacement have been recorded and analyzed as a function of cycles. Effects of the cyclic normal force and the inclined angle were discussed. The test results showed that wear, cracking and plastic deformation accumulation with a strong dissymmetry in damage morphology was observed. A transformation of fretting mode from composite to radial fretting mode occurred due to a strong modification at local contact configuration. As a conclusion, a physical model for wear mechanism of composite fretting was presented.

scholarly journals Fretting Wear Behavior of Three Kinds of Rubbers under Sphere-On-Flat Contact

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2153
Author(s):  
Tengfei Zhang ◽  
Jie Su ◽  
Yuanjie Shu ◽  
Fei Shen ◽  
Liaoliang Ke
Keyword(s):  
Normal Force ◽  
Wear Behavior ◽  
Displacement Amplitude ◽  
Fretting Wear ◽  
Butadiene Rubber ◽  
Force Frequency ◽  
Sealing Performance ◽  
Rubber Surface ◽  
Sealing Materials ◽  
Flat Contact

Rubbers are widely used in various fields as the important sealing materials, such as window seal, door seal, valve, pump seal, etc. The fretting wear behavior of rubbers has an important effect on their sealing performance. This paper presents an experimental study on the fretting wear behavior of rubbers against the steel ball under air conditions (room temperature at 20 ± 2 °C and humidity at 40%). Three kinds of rubbers, including EPDM (ethylene propylene diene monomer), FPM (fluororubber), and NBR (nitrile–butadiene rubber), are considered in experiments. The sphere-on-flat contact pattern is used as the contact model. The influences of the displacement amplitude, normal force, frequency, and rubber hardness on the fretting wear behavior are discussed in detail. White light profiler and scanning electron microscope (SEM) are used to analyze the wear mechanism of the rubber surface. The fretting wear performances of three rubbers are compared by considering the effect of the displacement amplitude, normal force, frequency, and rubber hardness. The results show that NBR has the most stable friction coefficient and the best wear resistance among the three rubbers.

scholarly journals Role of abrasive material on micro-abrasion wear tests

Wear ◽  
2011 ◽  
Vol 271 (9-10) ◽  
pp. 2632-2639 ◽  
Author(s):  
F.J.G. Silva ◽  
R.B. Casais ◽  
R.P. Martinho ◽  
A.P.M. Baptista
Keyword(s):  
Abrasive Material ◽  
Abrasion Wear ◽  
Wear Tests

Role of ZrO2 oxide layer on the fretting wear resistance of a nuclear fuel rod

2020 ◽  
Vol 145 ◽  
pp. 106146 ◽  
Author(s):  
Young-Ho Lee ◽  
Il-Hyun Kim ◽  
Hyung-Kyu Kim ◽  
Hyun-Gil Kim
Keyword(s):  
Wear Resistance ◽  
Oxide Layer ◽  
Nuclear Fuel ◽  
Fretting Wear ◽  
Fuel Rod

An Innovative System for Fretting Wear Testing Under Oscillating Normal Force

2000 ◽  
Vol 15 (7) ◽  
pp. 1591-1599 ◽  
Author(s):  
M. Z. Huq ◽  
C. Butaye ◽  
J-P. Celis
Keyword(s):  
Contact Resistance ◽  
Normal Force ◽  
Electrical Contact ◽  
Wear Test ◽  
Fretting Wear ◽  
Wear Testing ◽  
Mode Ii ◽  
Test Machine ◽  
Electrical Contact Resistance ◽  
Wide Range

Material damage caused by fretting wear is of significant concern in many engineering applications. This paper describes the design and performance of a new machine for the laboratory investigation of fretting wear under oscillating normal force (fretting mode II). The test machine uses an electromagnetic actuator to impose an oscillating normal force between the contacting bodies at a constant force amplitude over a wide range of frequencies. The principle of the actuation mechanism and the fretting wear induced with this particular wear test configuration are outlined in detail. Normal force and electrical contact resistance were measured on-line during fretting mode II wear tests. The performance of the wear test machine is illustrated by data obtained for different materials combinations, namely, hard materials, such as high-speed steel and (Ti,Al)N coatings oscillating against alumina ball counterbodies, and soft materials, such as a tin coating oscillating against the same. In general, wearing of the counterbodies was observed in the slip region. It has been observed that hard coatings and bulk ceramics are prone to fretting fatigue cracking. The evolution of electrical contact resistance in the case of the self-mated soft tin coatings tested under fretting mode II conditions is also reported.

Fretting Wear of CMSX4 at Blade Tip Interface With and Without Coating

2009 ◽  
Author(s):  
M. Lavella ◽  
D. Botto ◽  
M. M. Gola
Keyword(s):  
Flat Surface ◽  
Contact Stiffness ◽  
Three Dimensional ◽  
Large Change ◽  
Fretting Wear ◽  
Wear Behaviour ◽  
Wear Process ◽  
Blade Tip ◽  
Coated Surfaces ◽  
Contact Parameters

Fretting wear is a complex phenomenon that occurs at component interfaces that are subjected to low amplitude oscillation under high contact pressure. In turbomachinery fretting occurs also at the blade tip interfaces where shrouds, that have the aim to reduce the blade resonant vibration amplitude, are machined. To diminish the fretting damage coatings are applied to the blade tips. The aim of this study is to compare the fretting wear behaviour of single crystal CMSX-4 superalloy interfaces with and without plasma sprayed T-800 coating. Experiments have been conducted with hemispherical surface in contact with a flat surface of the same materials at temperature of 800 °C. The hysteresis cycles have been measured through the experiment. The comparison of the hysteresis cycles shown that the tangential contact stiffness of the coated surfaces is greater then that of the surfaces without coating. At the end of wear process, the mating surfaces have been characterized by three-dimensional optical interferometry and SEM analysis. After 10×106 wear cycles, the uncoated surfaces show a large change in the contact parameters and fretting cracks on the flat surface. On the other hand, the coated surfaces do not shows a measurable change in the contact parameters while the coating damage on the flat surface leads to predict an incipient catastrophic wear.

scholarly journals Fretting and Fretting Corrosion Processes of Ti6Al4V Implant Alloy in Simulated Oral Cavity Environment

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1561
Author(s):  
Marcin Klekotka ◽  
Jan Ryszard Dąbrowski ◽  
Katarzyna Rećko
Keyword(s):  
Artificial Saliva ◽  
Open Circuit ◽  
Fretting Wear ◽  
Dissipated Energy ◽  
Titanium Oxides ◽  
X Ray Diffraction ◽  
Fretting Corrosion ◽  
Pin On Disc

The paper presents the results of in vitro studies of fretting and fretting corrosion processes of Ti6Al4V implant alloy in the environment of natural saliva and self-made mucin-based artificial saliva solutions. The study was performed on a specially designed fretting pin-on-disc tester, which was combined with a set used for electrochemical research. The open circuit potential measurements and potentiodynamic method were used for corrosion tests. The worn surfaces were subjected to microscopic observations and an evaluation of wear. Results were interpreted using the dissipated energy and third-body approaches. The X-ray diffraction analysis showed that titanium oxides constitute over 80% of the friction products. Special attention was paid to the role of saliva and its substitutes, which in certain cases can lead to the intensification of fretting wear. On the basis of the received results, a new phenomenological model of fretting corrosion processes was proposed. This model involves the formation of an abrasive paste that is a combination of metal oxides and the organic components of saliva.

Effects of fretting wear on porous Ti materials by using rice husk as hold space

2020 ◽  
Vol 10 (3) ◽  
pp. 396-403
Author(s):  
Xinsheng Wang ◽  
Zhen Lin Lu ◽  
Jia Lei
Keyword(s):  
Friction Coefficient ◽  
Bovine Serum ◽  
Dry Friction ◽  
Three Dimensional ◽  
Pure Titanium ◽  
Porous Titanium ◽  
Fretting Wear ◽  
Wear Volume ◽  
Porous Ti ◽  
Wear Tests

A comparative analysis of the friction coefficient of pure and porous titanium was carried out through wear tests conducted both in dry friction conditions and using a bovine serum lubricant friction conditions. The microstructure, wear mechanism and three-dimensional topography of the two specimens were studied. In pure and porous titanium, the results show that the friction coefficient, wear volume and roughness were higher in dry friction than in the presence of lubrication for both pure and porous titanium. However, in dry friction and bovine serum lubricant tested, the resistance of pure titanium was higher than that of porous titanium.

A machine for fretting wear testing of plasma surface modified materials

Wear ◽  
1993 ◽  
Vol 166 (2) ◽  
pp. 163-168 ◽  
Author(s):  
P.W. Sandstrom ◽  
K. Sridharan ◽  
J.R. Conrad
Keyword(s):  
Fretting Wear ◽  
Wear Testing ◽  
Plasma Surface ◽  
Surface Modified
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