A descriptive model of wear evolution in rolling bearings

El‐Thalji, Idriss; Jantunen, Erkki

doi:10.1016/j.engfailanal.2014.06.004

Cited by 116 publications

(66 citation statements)

References 221 publications

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“…However, the size and shape of the surface defect due to wear are changing over the lifetime. One of the most probable scenario of wear evolution is presented in [46]. The scenario highlights that there are mainly four stress concentration mechanisms which involved in rolling contact: subsurface inclusions, asperities, dents and debris (as moving asperities).…”

Section: The Developed Dynamic Model Of Wear Evolutionmentioning

confidence: 99%

“…This information is required to simulate the changes in the stiffness and defectinduced forces (excitation forces) within the dynamic model. The literature which have been discussed in [46] show that the surface topography change due to wear can be represented as force functions. In Fig.…”

Section: The Developed Dynamic Model Of Wear Evolutionmentioning

confidence: 99%

“…Therefore, the fatigue wear theory is highly dependent on the asperity size and shape. However, as it is described in literature [46], the wear process is a process of multiple wear and stress concentration mechanisms and there are interactions and competitions among those mechanism. For example, the surface asperity induced stresses is sufficient to initiate and propagate the fatigue wear process.…”

Section: The Developed Dynamic Model Of Wear Evolutionmentioning

confidence: 99%

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Dynamic modelling of wear evolution in rolling bearings

El‐Thalji

Jantunen

2015

Tribology International

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Section: The Developed Dynamic Model Of Wear Evolutionmentioning

confidence: 99%

Section: The Developed Dynamic Model Of Wear Evolutionmentioning

confidence: 99%

Section: The Developed Dynamic Model Of Wear Evolutionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic modelling of wear evolution in rolling bearings

El‐Thalji

Jantunen

2015

Tribology International

Self Cite

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“…As the damage spread over a broader area, the vibration level raises again. This is called "healing" phenomenon and has been stated in [1,20,21]. Form #850 to the end #982, the condition of REB is becoming fierce.…”

Section: Experiments Illustrationmentioning

confidence: 99%

Rolling Element Bearing Performance Degradation Assessment Using Variational Mode Decomposition and Gath-Geva Clustering Time Series Segmentation

Wang

et al. 2017

International Journal of Rotating Machinery

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By focusing on the issue of rolling element bearing (REB) performance degradation assessment (PDA), a solution based on variational mode decomposition (VMD) and Gath-Geva clustering time series segmentation (GGCTSS) has been proposed. VMD is a new decomposition method. Since it is different from the recursive decomposition method, for example, empirical mode decomposition (EMD), local mean decomposition (LMD), and local characteristic-scale decomposition (LCD), VMD needs a priori parameters. In this paper, we will propose a method to optimize the parameters in VMD, namely, the number of decomposition modes and moderate bandwidth constraint, based on genetic algorithm. Executing VMD with the acquired parameters, the BLIMFs are obtained. By taking the envelope of the BLIMFs, the sensitive BLIMFs are selected. And then we take the amplitude of the defect frequency (ADF) as a degradative feature. To get the performance degradation assessment, we are going to use the method called Gath-Geva clustering time series segmentation. Afterwards, the method is carried out by two pieces of run-to-failure data. The results indicate that the extracted feature could depict the process of degradation precisely.

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“…In most applications, however, the bearings are not in a perpetual state of rolling and will be exposed to factors leading to mechanical wear such as slip, entry of abrasive particles in the system, a poor lubrication regime or system vibrations while the bearing is at rest and unlubricated, both leading to wear through raceway to rolling element contact [20]. The mechanisms that manifest in the wear of REBs will vary and may involve adhesive, abrasive, fatigue, corrosive wear or a combination of several such mechanisms [21].As mentioned, it is unlikely that pure rolling will be exhibited in the REB system. [22] discusses the manifestation of local sliding as a result of slip in the rolling contact, in this case the ball/race contact, concluding that the majority of rolling contacts are in reality 'rolling/sliding' contacts.…”

Section: Introductionmentioning

confidence: 99%

Sliding wear analysis of cobalt based alloys in nuclear reactor conditions

McCarron

Stewart

Shipway

et al. 2017

Wear

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The study of the wear behaviour of cobalt based alloys in nuclear reactor environmental conditions is the focus of this work. The alloys are used in components within reactors due to their excellent wear and corrosion resistance and their high hardness in the high pressure and temperature water facing environment. In the nuclear reactor core, cobalt is irradiated producing a highly penetrative gamma emitting isotope, cobalt 60 from stable cobalt 59. Wear of the cobalt alloys, producing wear debris, exacerbates this problem as it may be transported and deposited at various locations throughout the primary loop increasing the potential of radiation exposure. Removing this problem will require the removal of cobalt from the system.In order for suitable replacement materials to be identified, a better understanding of the behaviour of these alloys in the prototypical working conditions must be obtained. This work focuses on two cobalt based alloys used in the ball and race components of rolling element bearings in the reactor core, Stellite 20 and Haynes 25, respectively. The sliding wear behaviour of the alloys in an environment designed to replicate reactor conditions is examined using a bespoke pin on disc tribometer. Wear measurement and microstructural and compositional analysis of the samples tested over a range of conditions are presented and discussed.Concurrent to the experimental work is the development of a wear prediction model using a semi analytical method. The model employs Archard's wear law as the method of predicting wear using data obtained through experimentation. The accuracy of the semi analytical model is limited however it does give a good estimation for maximum wear depth of the test specimens.Keywords: Sliding wear; cobalt-based alloys; contact mechanics; pin on disc; wear prediction; IntroductionCobalt-based alloys offer very good resistance to wear and chemical corrosion, and, thanks to their exceptional properties in water lubricated environments, they are often used in different bearing surfaces in nuclear applications. In reactor environments, stable cobalt-59 is bombarded with thermal neutrons producing a radioactive isotope cobalt-60 [1]. Cobalt-60 has a relatively long half-life of 5.3 years and is a penetrative gamma emitter. Wear debris generated in bearings containing cobalt-60 is transported, suspended in the coolant, becoming deposited at locations around the loop. Exposure to cobalt-60 containing wear debris, produced due to different wear mechanisms, is a leading contributor to occupational radiation exposure of maintenance personnel [2]. Therefore, in order to reduce exposure to these isotopes, a leading contributor to occupational radiation exposure, there is a trend to reduce and ultimately remove cobalt based materials to facilitate decommissioning. It is necessary to find an alternative to cobalt based alloys which has suitable tribological properties in water; this can only be achieved by exploring the tribological behaviour of these alloys for bearing applicati...

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A descriptive model of wear evolution in rolling bearings

Cited by 116 publications

References 221 publications

Dynamic modelling of wear evolution in rolling bearings

Dynamic modelling of wear evolution in rolling bearings

Rolling Element Bearing Performance Degradation Assessment Using Variational Mode Decomposition and Gath-Geva Clustering Time Series Segmentation

Sliding wear analysis of cobalt based alloys in nuclear reactor conditions

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