scholarly journals A Simple Semi-Analytic Contact Mechanical Model for Tangential and Torsional Fretting Wear of Axisymmetric Contacts

Symmetry ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1582
Author(s):  
Emanuel Willert
Keyword(s):  
Order Approximation ◽  
Equation System ◽  
Fretting Wear ◽  
Partial Slip ◽  
Linear Wear ◽  
Characteristic Time Scale ◽  
Explicit Statement ◽  
Torsional Fretting ◽  
Contact Mechanical ◽  
Abrasive Paper

Fretting wear of axisymmetric contacts is considered within the framework of the Hertz–Mindlin approximation and the Archard law for the linear wear. If the characteristic time scale for the wear is much larger than the duration of a single fretting oscillation, the profile change due to wear during one fretting cycle can be neglected for the contact problem as a zero-order approximation. This allows to give an exact contact solution during each fretting cycle, depending on the current worn profile, and thus for the explicit statement of an ordinary integro-differential equation system for the time-evolution of the fretting profile, which can be easily solved numerically. The proposed method gives the same results as a known, contact mechanically more rigorous simulation procedure that also operates within the framework of the Hertz–Mindlin approximation, but works significantly faster than the latter one. Tangential and torsional fretting wear are considered in detail. A comparison of the numerical prediction for the evolution of the worn profile in partial slip torsional fretting of a rubber ball on abrasive paper shows good agreement with experimental results from the literature.

The Evolution of Contact Stress and Surface Profile in Press-Fitted Shaft under Partial Slip Conditions

2006 ◽  
Vol 321-323 ◽  
pp. 1495-1498 ◽  
Author(s):  
Dong Hyung Lee ◽  
Seok Jin Kwon ◽  
Chan Woo Lee ◽  
Jae Boong Choi ◽  
Young Jin Kim
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Surface Profile ◽  
Contact Stresses ◽  
Fretting Wear ◽  
Partial Slip ◽  
Initial Surface ◽  
Slip Conditions ◽  
Bending Load ◽  
Element Method

In this paper the fretting wear of press-fitted specimens under partial slip conditions was simulated using finite element method and numerical analysis based on Archard's equation. An elasto-plastic analysis of contact stresses in a press-fitted shaft in contact with a boss was conducted with finite element method and the amount of microslip and contact pressure due to bending load was estimated. The predicted wear profile of press-fitted specimens at the contact edge was compared with the experimental results. It is found that the depth of fretting wear by repeated slip between shaft and boss reaches the maximum value at the contact edge. The initial surface profile is continuously changed by the wear at the contact edge, and then the corresponding contact stresses and strain are redistributed.

Fretting wear behavior of thermal-oxidation on titanium alloy in air and vacuum atmosphere

2021 ◽  
pp. 2150135
Author(s):  
Liangliang Sheng ◽  
Xiangtao Deng ◽  
Hao Li ◽  
Yuxuan Ren ◽  
Guoqing Gou ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Titanium Alloy ◽  
Thermal Oxidation ◽  
Wear Behavior ◽  
Fretting Wear ◽  
Partial Slip ◽  
Ti6al4v Titanium Alloy ◽  
Slip Regime ◽  
Air Atmosphere ◽  
Vacuum Atmosphere

In this work, an in-situ XPS analysis test combined self-designed high precision fretting wear tester was carried out to study the fretting wear behavior and the resulting tribo-oxidation of thermal-oxidation film on Ti6Al4V titanium alloy under the varied working atmosphere. The fretting-induced tribo-oxidation under the air and vacuum ([Formula: see text] Pa) environment was analyzed and its response on the resulting fretting wear resistance and damage mechanism was discussed. Results show that the working environment plays a significant role in the formation of tribo-oxidation and then determining the fretting wear resistance. Thermal-oxidation film in the vacuum atmosphere shows a better fretting wear resistance than that in the air atmosphere for all fretting regimes, except for partial slip regime (PSR) where there is an equivalent fretting wear resistance. Compared with the substrate Ti6Al4V titanium alloy, the thermal-oxidation film in the vacuum atmosphere performs a good protection for titanium alloy, especially for slip regime (SR), but not applied for air atmosphere.

scholarly journals Fretting Wear Behavior and Damage Mechanisms of Inconel X-750 Alloy in Dry Contacts

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Ibrohim A. Rustamov ◽  
Ozoda Sh. Sabirova ◽  
Zixi Wang ◽  
Yuming Wang
Keyword(s):  
Wear Behavior ◽  
Normal Load ◽  
Fretting Wear ◽  
Partial Slip ◽  
Test Duration ◽  
Material Transfer ◽  
Friction Forces ◽  
Frictional Properties ◽  
Load Tests ◽  
Oxidation Mechanisms

Tribological behavior of the Inconel X-750 alloy disk subjected to fretting against the GCr15 steel ball was investigated in an ambient laboratory air with relative humidity of 55–65%. A high-frequency oscillating Optimol SRV 4 tribometer was employed to execute dry fretting tests in the partial and gross slip regimes under constant 100 N normal load. Tests were carried out for 10, 30, and 90 minutes, and the friction forces vs. displacement amplitudes were monitored during the test duration. Posttest examinations were conducted utilizing advanced tools such as 3D optical surface profiler, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX). The main objective was to obtain wear scar evolutions, frictional properties, and degradation mechanisms under the different running conditions over time. It was found that fretting wear behaviors of friction pairs were strongly influenced by fretting regimes. Degradation evolutions were greatly influenced by fretting time during partial slip regimes, i.e., evolving from asperity deformation and slight damage to the fatigue crack and material transfer. However, the combination of adhesive, abrasive, delamination, and wear oxidation mechanisms was repeated during the entire gross slip fretting process.

Cracking Induced by Fretting of Aluminium Alloys

1997 ◽  
Vol 119 (1) ◽  
pp. 36-42 ◽  
Author(s):  
Z. R. Zhou ◽  
L. Vincent
Keyword(s):  
Aluminium Alloys ◽  
Small Amplitude ◽  
Crack Nucleation ◽  
Normal Load ◽  
Fatigue Cracking ◽  
Fretting Fatigue ◽  
Fretting Wear ◽  
Partial Slip ◽  
Material Loss ◽  
Main Effects

Fretting-wear and fretting-fatigue loadings can both result in wear (material loss) and in crack nucleation and propagation (fatigue process). This paper deals with cracking induced by small amplitude displacements in the case of aeronautic aluminium alloys. The two sets of fretting maps are introduced: running condition fretting map is composed of partial slip (sticking), mixed fretting and gross sliding regime; material response fretting map is associated with two macro-degradation modes. Crack nucleation and propagation are analysed for every fretting regime. The mixed fretting regime appeared most detrimental with regards to fatigue cracking. Slip amplitude and normal load main effects discussed for fretting wear can be used to justify the fatigue limit decrease often obtained for fretting fatigue experiments.

Analysis of Displacement-Controlled Fretting Between a Hemisphere and a Flat Block in Elasto-Plastic Contacts

2018 ◽  
Vol 141 (3) ◽  
Author(s):  
Huaidong Yang ◽  
Itzhak Green
Keyword(s):  
Material Properties ◽  
Large Range ◽  
Three Dimensional ◽  
Fretting Wear ◽  
Von Mises Stress ◽  
Partial Slip ◽  
Ductile Material ◽  
Element Analysis ◽  
Metallic Contact ◽  
Von Mises

This work employs a three-dimensional (3D) finite element analysis (FEA) to investigate the fretting metallic contact between a deformable hemisphere and a deformable flat block. Fretting is governed by displacement-controlled action where the materials of the two contacting bodies are set to have identical properties; studied first is steel-on-steel and then copper-on-copper. At contact onset, a normal interference (indentation) is applied, which is then followed by transverse cyclic oscillations. A large range of coefficients of friction (COFs) is imposed at the interface. The results show that the maximum von Mises stress is confined under the contacting surface for small COFs; however, that maximum reaches the contacting surface when the COFs are sufficiently large. It is also shown that fretting under sufficiently large COFs forms large plastic strains in “ring” like patterns at the contacting surfaces. Junction growth is found where the contacting region is being stretched in the direction of the fretting motion. At large COFs, pileups show up at the edges of the contact. The fretting loops of the initial cycles are found along with the total work invested into the system. At certain interference, there exists a certain COF, which results in the largest work consumption. The magnitude of the COF is found to produce either partial slip (prone for fretting fatigue) or gross slip (prone for fretting wear). A scheme of normalization is proposed, and it is shown to be effective for the two said materials that have vastly different material properties. Hence, the normalized results may well characterize a range of contact scales (from micro to macro) of various ductile material pairs that behave in an elastic–plastic manner with strain hardening.

A Novel Three-Dimensional Finite Element Model to Simulate Third Body Effects on Fretting Wear of Hertzian Point Contact in Partial Slip

2020 ◽  
Vol 143 (4) ◽  
Author(s):  
Arman Ahmadi ◽  
Farshid Sadeghi
Keyword(s):  
Finite Element ◽  
Material Properties ◽  
Three Dimensional ◽  
Point Contact ◽  
Fretting Wear ◽  
Partial Slip ◽  
Wear Particles ◽  
Third Body ◽  
Stick Slip ◽  
The Third

Abstract In this investigation, a finite element (FE) model was developed to study the third body effects on the fretting wear of Hertzian contacts in the partial slip regime. An FE three-dimensional Hertzian point contact model operating in the presence of spherical third bodies was developed. Both first bodies and third bodies were modeled as elastic–plastic materials. The effect of the third body particles on contact stresses and stick-slip behavior was investigated. The influence of the number of third body particles and material properties including modulus of elasticity, hardening modulus, and yield strength were analyzed. Fretting loops in the presence and absence of wear particles were compared, and the relation between the number of cycles and the hardening process was evaluated. The results indicated that by increasing the number of particles in contact, more load was carried by the wear particles which affect the wear-rate of the material. In addition, due to the high plastic deformation of the debris, the wear particles deformed and took a platelet shape. Local stick-slip behavior over the third body particles was also observed. The results of having wear debris with different material properties than the first bodies indicated that harder wear particles have a higher contact pressure and lower slip at the location of particles which affects the wear-rate.

Investigations on torsional fretting wear properties of CuAlNi processed by ultrasonic vibration-assisted milling

2020 ◽  
Vol 146 ◽  
pp. 106238 ◽  
Author(s):  
Xin Chen ◽  
Wenzheng Zhai ◽  
Song Dong ◽  
Kan Zheng ◽  
Runzhou Xu ◽  
...  
Keyword(s):  
Ultrasonic Vibration ◽  
Fretting Wear ◽  
Wear Properties ◽  
Torsional Fretting

Study on fretting wear and tribo-chemical behavior of LZ50 axle steel in torsional fretting fatigue

Wear ◽  
2019 ◽  
Vol 426-427 ◽  
pp. 704-711 ◽  
Author(s):  
Zhibiao Xu ◽  
Jinfang Peng ◽  
Jianhua Liu ◽  
Xiyang Liu ◽  
Wulin Zhang ◽  
...  
Keyword(s):  
Fretting Fatigue ◽  
Fretting Wear ◽  
Chemical Behavior ◽  
Torsional Fretting
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