Wear analysis in fretting of hard coatings through a dissipated energy concept

Fouvry, S.; Kapsa, Ph.; Zahouani, H.; Vincent, L.

doi:10.1016/s0043-1648(96)07436-4

Cited by 185 publications

(134 citation statements)

References 10 publications

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“…Considering the durability of TiN and TiCN coatings ( formed due to micro-fracture of the coatings provoked by important tensile stresses in the coatings generated by the spherical alumina counter-body under high normal loads. It has been proved in the previous work [21] that the characteristic W-shape of a scar is related to a modification of the surface geometry by the generation of a third-body and to its occurrence within the contact area. When the fretting is progressing an annular spatial distribution of this third-body on the surface of the counterbody (alumna ball) is being generated.…”

Section: Discussionmentioning

confidence: 98%

Development of a Wöhler-like approach to quantify the Ti(CxNy) coatings durability under oscillating sliding conditions

Liskiewicz

Fouvry

Wendler

2005

Wear

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The selection of a proper material for the particular engineering application is a complex problem, as different materials offer unique properties and it is not possible to gather all useful characteristics in a single one. Hence, employment of different surface treatment processes is a widely used alternative solution. In many industrial applications, coating failure may be conducive to catastrophic consequences. Thus, to prevent the component damage it is essential to establish the coating endurance and indicate the safe running time of coated system. To this study PVD TiC, TiN and TiCN hard coatings have been selected and tested against polycrystalline alumina smooth ball. The series of fretting tests with reciprocating sliding at the frequency 5Hz have been carried out under 50-150N normal loads and under wide rage of constant as well as variable displacement amplitudes from 50µm to 200µm at a constant value of relative humidity of 50% at 296K temperature. To quantify the loss of material a dissipated energy approach has been applied where the wear depth evolution is referred to the cumulative density of friction work dissipated during the test. Different dominant damage mechanisms have been indicated for the investigated hard coatings, which is debris formation and ejection in case of TiC coating and progressive wear accelerated by cracking phenomena in case of TiN and TiCN coatings. Energy-Wöhler wear chart has been introduced, in which the critical 1 dissipated energy density corresponds to the moment when the substrate is reached after a given number of fretting cycles. Two different methods to determine the critical dissipated energy density are introduced and compared. The Energy-Wöhler approach has been employed not only to compare the global endurance of the investigated systems but also to compare the intrinsic wear properties of the coatings. It has been shown that the fretting wear process is accelerated by the stress-controlled spalling phenomenon below a critical residual thickness and a severe decohesion mechanism is activated. Finally the applicability of the investigated method to other coated systems subjected to wear under sliding conditions is discussed and analyzed. The perspectives of this new approach are elucidated.

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Section: Discussionmentioning

confidence: 98%

Development of a Wöhler-like approach to quantify the Ti(CxNy) coatings durability under oscillating sliding conditions

Liskiewicz

Fouvry

Wendler

2005

Wear

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“…Instead, the average F t was calculated by dividing the total energy dissipated in a sliding cycle (E) by the total sliding distance per cycle (4D) [17]:…”

Section: Running-in Process Of Si/sio 2 Pairmentioning

confidence: 99%

Running-in process of Si-SiO x /SiO2 pair at nanoscale—Sharp drops in friction and wear rate during initial cycles

et al. 2013

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Abstract:Using an atomic force microscope, the running-in process of a single crystalline silicon wafer coated with native oxide layer (Si-SiO x ) against a SiO 2 microsphere was investigated under various normal loads and displacement amplitudes in ambient air. As the number of sliding cycles increased, both the friction force F t of the Si-SiO x /SiO 2 pair and the wear rate of the silicon surface showed sharp drops during the initial 50 cycles and then leveled off in the remaining cycles. The sharp drop in F t appeared to be induced mainly by the reduction of adhesion-related interfacial force between the Si-SiO x /SiO 2 pair. During the running-in process, the contact area of the Si-SiO x /SiO 2 pair might become hydrophobic due to removal of the hydrophilic oxide layer on the silicon surface and the surface change of the SiO 2 tip, which caused the reduction of friction force and the wear rate of the Si-SiO x /SiO 2 pair. A phenomenological model is proposed to explain the running-in process of the Si-SiO x /SiO 2 pair in ambient air. The results may help us understand the mechanism of the running-in process of the Si-SiO x /SiO 2 pair at nanoscale and reduce wear failure in dynamic microelectromechanical systems (MEMS).

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“…For each wear scar profiles along and across the sliding direction were obtained. To determine the total wear volume, a simplified integration was used [9]. Prior to testing, specimens were cleaned with acetone.…”

Section: Test Conditionsmentioning

confidence: 99%

“…Transposing previous local energy developments [9], a dissipated energy density approach is derived. In a first approximation the Hertzian shear work distribution could be utilized but due to rapid wear of the interface and its constant extension a mean pressure description appears to be more representative [12].…”

Section: Constant Loading Conditionsmentioning

confidence: 99%

Impact of variable loading conditions on fretting wear

Liskiewicz

Fouvry

Wendler

2003

Surface and Coatings Technology

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:Fretting is considered as a specific type of reciprocating sliding. It is defined as a small displacement amplitude oscillatory motion between two solids in contact, usually induced by vibrations. Depending on the loading conditions (displacement amplitudes, normal loading), fretting causes damage by surface fatigue and wear induced by debris formation. To prevent such damage, numerous hard coatings have been developed which improve the wear resistance of contacts. However, one difficulty is to estimate how long it will be before the coating wears through. Studies have been conducted to analyze the effect of displacement amplitude, normal force or ambient atmosphere, but usually under constant loading conditions. Such a situation is far from real operating components, where elements are subjected to variable loadings implying variable displacement amplitudes. To predict the durability of a coating under variable fretting displacements, wear depth is quantified as a function of the maximum accumulated dissipated energy density by derivation from a global energy wear approach. This model is compared to TiC vs. alumina fretting experiments. Very good correlation is observed between the prediction and the wear depth, independently of the applied variable amplitude sequences. An equivalent "Miner-Energy" wear model is introduced which permits the durability of the coating to be estimated.1

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Wear analysis in fretting of hard coatings through a dissipated energy concept

Cited by 185 publications

References 10 publications

Development of a Wöhler-like approach to quantify the Ti(CxNy) coatings durability under oscillating sliding conditions

Development of a Wöhler-like approach to quantify the Ti(CxNy) coatings durability under oscillating sliding conditions

Running-in process of Si-SiO x /SiO2 pair at nanoscale—Sharp drops in friction and wear rate during initial cycles

Impact of variable loading conditions on fretting wear

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