scholarly journals The roles of contact conformity, temperature and displacement amplitude on the lubricated fretting wear of a steel-on-steel contact

2016 ◽  
Vol 3 (10) ◽  
pp. 150637 ◽  
Author(s):  
A. R. Warmuth ◽  
W. Sun ◽  
P. H. Shipway
Keyword(s):  
Contact Pressure ◽  
Displacement Amplitude ◽  
Fretting Wear ◽  
Wear Behaviour ◽  
Physical Parameters ◽  
Chemical Effects ◽  
Experimental Parameters ◽  
The Relationship ◽  
Lubricant Viscosity ◽  
Flat Contact

This paper investigates the effect of contact geometry, temperature and displacement amplitude on the fretting behaviour of an aero-turbo oil lubricated cylinder-on-flat contact. To be effective, the lubricant needed both to penetrate the contact and then offer protection. Lubricant penetration into the fretting contact is found to be controlled by two physical parameters, namely (i) the width of the contact that remains covered throughout the fretting test and (ii) the lubricant viscosity. The protection offered by the lubricant (assuming that it has successfully penetrated the contact) is influenced by four physical parameters, namely (i) lubricant viscosity, (ii) traverse velocity, (iii) nominal contact pressure, and (iv) chemical effects. The relationship between the three experimental parameters which were varied in the programme of work (temperature, fretting displacement and cylinder radius) and physical parameters which influence the protection offered by the lubricant film can be competing, and therefore complex wear behaviour is observed. The roles of the various parameters in controlling the wear behaviour are presented in a coherent physical framework.

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.

HAp Coated Hip Prosthesis Contact Pressure Prediction Using FEM Analysis

2020 ◽  
Vol 991 ◽  
pp. 53-61
Author(s):  
Muniandy Nagentrau ◽  
Abdul Latif Mohd Tobi ◽  
Saifulnizan Jamian ◽  
Yuichi Otsuka
Keyword(s):  
Finite Element ◽  
Titanium Alloy ◽  
Contact Pressure ◽  
Stress Ratio ◽  
Hip Prosthesis ◽  
Developed Countries ◽  
Human Bone ◽  
Fretting Wear ◽  
Wear Behaviour ◽  
Delamination Length

Total hip replacement is surgical procedure which is widely performed in most of the developed countries due to rapid aging. The extensive application of titanium alloy as hip prosthesis can be seen because of its suitable properties such as good biocompatibility, light weight and high strength. However, coating or bond is required as titanium alloy ineffective to be adhered directly with human bone. Hydroxyapatite (HAp) is common coating material used to bond Ti-6Al-4V hip prosthesis with human bone. HAp-Ti-6Al-4V interface is a possible fretting wear region which is subjected to significant contact pressure. HAp-Ti-6Al-4V interface fretting fatigue delamination leads to contact pressure which can accelerate fretting wear behaviour of HAp coating. Present paper discusses the influence of delamination length and fatigue stress ratio on contact pressure distribution at interface of HAp-Ti-6Al-4V using finite element methodology. A simple two-dimensional finite element contact configuration consisting Ti-6Al-4V substrate, HAp coating and contact pad (representing bone) is employed to examine under static analysis. The finite element predicted results highlighted that contact pressure can be promoted under increased delamination length condition and stress ratio of 0.1 (tension-tension). Contact pressure can accelerate HAp coating fretting wear behaviour.

The relationship between physical parameters and wear of dental composites

Wear ◽  
2007 ◽  
Vol 263 (7-12) ◽  
pp. 1138-1146 ◽  
Author(s):  
S.D. Heintze ◽  
G. Zellweger ◽  
G. Zappini
Keyword(s):  
Dental Composites ◽  
Physical Parameters ◽  
The Relationship

Fretting wear behaviour of polymethylmethacrylate under linear motions and torsional contact conditions

1998 ◽  
Vol 31 (11) ◽  
pp. 701-711 ◽  
Author(s):  
B.J. Briscoe ◽  
A. Chateauminois ◽  
T.C. Lindley ◽  
D. Parsonage
Keyword(s):  
Fretting Wear ◽  
Wear Behaviour ◽  
Contact Conditions

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.

Study on the Relationship between Canal System Conveyance Efficiency and Basic Physical Parameters of Gravity Irrigation Districts

2014 ◽  
Vol 955-959 ◽  
pp. 3422-3426
Author(s):  
Hong Wei Jia ◽  
Ke Ke Hu ◽  
Fei Su
Keyword(s):  
Physical Parameters ◽  
Irrigation Canal ◽  
Canal System ◽  
Positive Role ◽  
Engineering Construction ◽  
Irrigation Districts ◽  
Basic Parameters ◽  
Irrigation Engineering ◽  
Operation Status ◽  
The Relationship

Canal system conveyance efficiency (CSCE ) is a basic parameter of engineering construction and water management of the irrigation districts, either the response of operation status of an irrigation canal system. It plays great significance in searching quantity relationship between ICSCE and other basic parameters reflecting the condition of irrigation engineering. This paper, gravity irrigation districts in Zhejiang province as an example, sets up the relationship between basic parameters such as irrigation canal lining rate, canal flow and the CSCE, based on determining the CSCE in 61 typical gravity irrigation districts. And it also reflects the influence of basic parameters on CSCE, having a certain accuracy. This result plays a positive role on the further research and actual work on CSCE.

scholarly journals Fretting wear behaviour of double-glow plasma Cr–Nb coating on γ-TiAl alloy

2017 ◽  
Vol 231 (9) ◽  
pp. 1184-1191
Author(s):  
Xiangfei Wei ◽  
Pingze Zhang ◽  
Dongbo Wei ◽  
Hongyuan Zhao ◽  
Chun Wang ◽  
...  
Keyword(s):  
Tial Alloy ◽  
Fretting Wear ◽  
Wear Behaviour ◽  
Glow Plasma

Fractal and Non-Fractal Surfaces in Ion Sputtering

1995 ◽  
Vol 407 ◽  
Author(s):  
A.-L. Barabási ◽  
R. Cuerno
Keyword(s):  
Nonlinear Equation ◽  
Penetration Depth ◽  
Experimental Studies ◽  
Ion Bombardment ◽  
Physical Parameters ◽  
Angle Of Incidence ◽  
Ion Sputtering ◽  
Scaling Properties ◽  
Fractal Surfaces ◽  
Experimental Parameters

ABSTRACTRecently a number of experimental studies focusing on the scaling properties of surfaces eroded by ion bombardment provided apparently contradictory results. A number of experiments report the observation of self-affine fractal surfaces, while others provide evidence about the development of a non-fractal periodic ripple structure. To explain these discrepancies, here we derive a stochastic nonlinear equation that describes the evolution and scaling properties of surfaces eroded by ion bombardment. The coefficients appearing in the equation can be calculated explicitly in terms of the physical parameters characterizing the sputtering process. We find that transitions may take place between various scaling behaviors when experimental parameters, such as the angle of incidence of the incoming ions or their average penetration depth, are varied.

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