Terry J. Harvey
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View article: Comparative Study of the Tribological Properties of MoSe2 Coatings Under Dry and Oil-Lubricated Sliding Conditions
Comparative Study of the Tribological Properties of MoSe2 Coatings Under Dry and Oil-Lubricated Sliding Conditions Open
MoSe2 is considered one of the most promising low-friction coatings for tribological applications due to its exceptionally low sensitivity to air humidity. However, knowledge of its tribological performance, especially in combination with …
View article: Changes in surface topography during running-in of bearing steel contacts under mixed lubrication
Changes in surface topography during running-in of bearing steel contacts under mixed lubrication Open
Under mixed lubrication conditions, running-in is typically associated with a change in surface topography as surfaces conform at the very beginning of bearing operation. During this period, exposed roughness peaks of both bodies initially…
View article: Electrostatic sensing of wear and friction dynamics in dry and starved-lubricated tribocontacts
Electrostatic sensing of wear and friction dynamics in dry and starved-lubricated tribocontacts Open
Wear mechanisms in dry and starved-lubricated contacts are critical factors contributing to the degradation of component surfaces. Real-time monitoring of wear progression presents significant challenges due to the complex nature of these …
View article: Influence of White Etching Bands Formation on Integrity of Rolling Element Bearings
Influence of White Etching Bands Formation on Integrity of Rolling Element Bearings Open
The development of subsurface microstructural alterations known as dark etching regions (DERs) and white etching bands (WEBs) in rolling element bearings due to rolling contact fatigue have been investigated for the past eight decades, foc…
View article: Initiation and evolution of butterflies in roller bearings due to rolling contact fatigue
Initiation and evolution of butterflies in roller bearings due to rolling contact fatigue Open
This investigation entails analysis of 520 butterfly formations (BFs) and non-metallic inclusions without BFs in two RCF-tested roller bearings to elucidate the influence of inclusion characteristics and stress level they are subject to, o…
View article: Investigating high-speed liquid impingement with full-field measurements
Investigating high-speed liquid impingement with full-field measurements Open
Repeated high-speed liquid impingement on solid surfaces results in erosion that can have undesirable consequences. In recent years, the capacity of model predictions has exceeded the experimental measurements of an impingement; this work …
View article: A Study on the Influence of Electrical Discharges on the Formation of White Etching Cracks in Oil-Lubricated Rolling Contacts and Their Detection Using Electrostatic Sensing Technique
A Study on the Influence of Electrical Discharges on the Formation of White Etching Cracks in Oil-Lubricated Rolling Contacts and Their Detection Using Electrostatic Sensing Technique Open
In bearing applications, the presence of stray and parasitic currents in combination with lubricants has been studied for almost a century and has been found to cause fluting and corrugation damages under high current densities. However, r…
View article: Wear induced changes in surface topography during running-in of rolling-sliding contacts
Wear induced changes in surface topography during running-in of rolling-sliding contacts Open
Running-in occurs in rolling-sliding contacts under mixed-friction conditions and typically involves asperity smoothing through mild wear and plastic deformation. To improve the prediction of service life or friction of rolling-element bea…
View article: Mechanical and tribological characterisations of PEG-based hydrogel coatings on XLPE surfaces
Mechanical and tribological characterisations of PEG-based hydrogel coatings on XLPE surfaces Open
Hydrophilic hydrogel coatings can impart enhanced tribological and antifouling properties to biomedical device surfaces. The influence of crosslinking on the elastic moduli of poly (ethylene glycol) (PEG) hydrogels is well established, how…
View article: A TEG-Excited Switched Reluctance Generator for Self-Powered Sensing in Next Generation Aircraft
A TEG-Excited Switched Reluctance Generator for Self-Powered Sensing in Next Generation Aircraft Open
New aircraft concepts are proposed to support emission reduction in aviation. To achieve the advantages of these concepts an electrical system with high power delivery and low system mass needs to be considered. The reduction of weight of …
View article: Mechanistic study of dark etching regions in bearing steels due to rolling contact fatigue
Mechanistic study of dark etching regions in bearing steels due to rolling contact fatigue Open
Dark etching region (DER) formation is the first stage of a series of subsurface microstructural alterations induced by cyclic stresses during rolling contact fatigue in bearing steels followed by the formation of low angle bands (LAB) and…
View article: Measuring the elastic modulus of soft biomaterials using nanoindentation
Measuring the elastic modulus of soft biomaterials using nanoindentation Open
The measurement of the elastic modulus of soft biomaterials via nanoindentation relies on the accurate determination of the zero-point of the tip-sample interaction on which the depth of penetration into the sample is based. Non-cantilever…
View article: White etching bands formation mechanisms due to rolling contact fatigue
White etching bands formation mechanisms due to rolling contact fatigue Open
Subsurface micro-structural changes such as dark etching region (DER) and white etching bands (WEB) which develop in bearing steels due to cyclic stresses in rolling contacts, have been studied for decades and a number of theoretical model…
View article: Electrical Discharges in Oil-Lubricated Rolling Contacts and Their Detection Using Electrostatic Sensing Technique
Electrical Discharges in Oil-Lubricated Rolling Contacts and Their Detection Using Electrostatic Sensing Technique Open
The reliability of rolling element bearings has been substantially undermined by the presence of parasitic and stray currents. Electrical discharges can occur between the raceway and the rolling elements and it has been previously shown th…
View article: Easily fabricated monolithic fluoropolymer chips for sensitive long-term absorbance measurement in droplet microfluidics
Easily fabricated monolithic fluoropolymer chips for sensitive long-term absorbance measurement in droplet microfluidics Open
We present a widely accessible method for fabricating monolithic fluoropolymer microfluidic chips, which allows droplet absorbance measurement over multi-month periods.
View article: Design and Testing of a Sensing System for Aero-Engine Smart Bearings
Design and Testing of a Sensing System for Aero-Engine Smart Bearings Open
Smart bearings incorporating self-powered sensors and wireless data communications with intelligence in monitoring bearing conditions can help to detect early faults in aero-engine bearings. This paper presents the challenges in design and…
View article: Dataset for Characterisation of rain erosion at ex-service turbofan blade leading edges
Dataset for Characterisation of rain erosion at ex-service turbofan blade leading edges Open
Dataset supports: Ma, Dina et al (2019). Characterisation of rain erosion at ex-service turbofan blade leading edges. Wear. Fig. 8 Comparison of Rq values between Blade 1 and Blade 2.] and Fig. 9 Volume loss per crater along the ex-service…
View article: Oil-cooled thermoelectric energy harvesting foraero-engine sensing system
Oil-cooled thermoelectric energy harvesting foraero-engine sensing system Open
To enhance the performance and reliability of aircraft propulsion systems, an integrated bearing condition monitoring system is proposed. This intelligent bearing must have advanced health management capabilities to provide early warning o…
View article: Numerical analysis and optimization of surface textures for a tilting pad thrust bearing
Numerical analysis and optimization of surface textures for a tilting pad thrust bearing Open
A thermo-hydrodynamic model previously developed by the authors is applied in this paper to study the influence of surface texturing on the performance of a tilting pad thrust bearing with offset line pivots. Utilizing an interior-point al…
View article: A numerical model for design and optimization of surface textures for tilting pad thrust bearings
A numerical model for design and optimization of surface textures for tilting pad thrust bearings Open
A numerical model based on the Reynolds equation to study textured tilting pad thrust bearings considering mass-conserving cavitation and thermal effects is presented. A non-uniform and adaptive finite volume method is utilized and two met…
View article: A numerical design tool for textured hydrodynamic bearings
A numerical design tool for textured hydrodynamic bearings Open
A successful application of surface texturing in hydrodynamic bearings relies heavily on efficient numerical models. In this work, several ways to enhance the computational performance of models based on the Reynolds equation are presented…
View article: Numerical optimization of surface textures for tilting pad thrust bearings
Numerical optimization of surface textures for tilting pad thrust bearings Open
A successful application of surface texturing in hydrodynamic bearings relies heavily on efficient numerical models. In this work, several ways to enhance the computational performance of models based on the Reynolds equation are presented…
View article: Advanced signal processing techniques for wind turbine gearbox bearing failure detection
Advanced signal processing techniques for wind turbine gearbox bearing failure detection Open
Premature wind turbine gearbox failure has been observed to occur after periods as short as 5 years, while the design life of a gearbox is expected to exceed 20 years. Most wind turbine failures have been found to be initiated at the beari…