Amir Kadiric
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View article: The Influence of Lubricant Formulation on Surface Damage Under Electrified Rolling-Sliding Contact with Relevance to Electric Vehicle Drivetrain Applications
The Influence of Lubricant Formulation on Surface Damage Under Electrified Rolling-Sliding Contact with Relevance to Electric Vehicle Drivetrain Applications Open
Surface damage due to electric potential is one of the primary reliability concerns for electric vehicle drive units. This paper for the first time identifies specific lubricant components which promote such damage. The work can help desig…
View article: Asperity Pressures in Elastic–Plastic Rough Surface Contacts
Asperity Pressures in Elastic–Plastic Rough Surface Contacts Open
Asperity pressures and deformations are key factors in determining the friction and wear behavior of tribological contacts. Although numerical contact models to predict these pressures have existed since 1980s, their accuracy is limited by…
View article: Optimization of Electric Vehicle Drivetrain Fluid with a New System-Level Approach
Optimization of Electric Vehicle Drivetrain Fluid with a New System-Level Approach Open
This paper uses a newly developed tribology-based system-level transmission efficiency model to investigate the influence of e-fluid properties on electric vehicle (EV) drivetrain losses. The model considers gear meshing losses using a the…
View article: Influence of Electric Potentials on Surface Damage in Rolling–Sliding Contacts Under Mixed Lubrication
Influence of Electric Potentials on Surface Damage in Rolling–Sliding Contacts Under Mixed Lubrication Open
Shaft voltages in electric vehicle drivetrains are believed to be capable of causing significant damage to rolling bearing surfaces. While surface damage due to high current discharge in full-film lubrication is relatively well understood,…
View article: Elastohydrodynamic Traction and Film Thickness at High Speeds
Elastohydrodynamic Traction and Film Thickness at High Speeds Open
A renewed interest in elastohydrodynamic lubrication (EHL) phenomena at high speeds, for which thermal effects strongly influence both traction and film thickness, has grown out of the challenges presented by high-speed geared transmission…
View article: Experimental study of frictional behaviour of powdered soaps for wire drawing
Experimental study of frictional behaviour of powdered soaps for wire drawing Open
Better understanding of frictional behaviour of powdered soaps used in dry wire drawing can lead to improvements in wire quality and large savings in energy consumption. The latter is particularly significant given the colossal amounts of …
View article: An Investigation Into the Influence of Viscosity on Gear Churning Losses by Considering the Effective Immersion Depth
An Investigation Into the Influence of Viscosity on Gear Churning Losses by Considering the Effective Immersion Depth Open
We present an experimental investigation into the influence of oil viscosity on gear churning losses in splash-lubricated transmission systems. The inertia rundown method was used to perform tests on a single gear within a cylindrical hous…
View article: Effect of Lubricant Properties and Contact Conditions on False Brinelling Damage
Effect of Lubricant Properties and Contact Conditions on False Brinelling Damage Open
False brinelling is a type of fretting wear that occurs in rolling bearings when the contacts of bearing rings and rolling elements are subjected to small-amplitude oscillatory motion. It manifests itself as deep craters with relatively po…
View article: Effect of Lubricant Properties and Contact Conditions on False Brinelling Damage
Effect of Lubricant Properties and Contact Conditions on False Brinelling Damage Open
False brinelling is a type of fretting wear that occurs in rolling bearings when the contacts of bearing rings and rolling elements are subjected to small-amplitude oscillatory motion. It manifests itself as deep craters with relatively po…
View article: Prediction of rolling contact fatigue crack propagation in bearing steels using experimental crack growth data and linear elastic fracture mechanics
Prediction of rolling contact fatigue crack propagation in bearing steels using experimental crack growth data and linear elastic fracture mechanics Open
Rolling contact fatigue (RCF) is a major life limiting factor for machine elements that employ non-conformal, rolling sliding, lubricated contacts such as rolling bearings and gears. This paper explores the application of linear elastic fr…
View article: The influence of Λ ratio and surface roughness on the initiation and progression of micropitting damage
The influence of Λ ratio and surface roughness on the initiation and progression of micropitting damage Open
Micropitting is a major failure mode in gears and rolling bearings. Despite its practical importance, there currently exist no universally accepted design guidelines for its prevention primarily due to the great number of influencing param…
View article: Influence of PMA on the anti-scuffing properties of AW/EP additives
Influence of PMA on the anti-scuffing properties of AW/EP additives Open
Scuffing is becoming a quite common failure mode in gears and bearings. It has been shown that AW/EP additives are effective in preventing scuffing, but only if they are able to form a thick tribofilm before encountering severe scuffing-ty…
View article: In-Situ Observation of the Effect of the Tribofilm Growth on Scuffing in Rolling-Sliding Contact
In-Situ Observation of the Effect of the Tribofilm Growth on Scuffing in Rolling-Sliding Contact Open
General reductions in lubricant viscosities in many machine components mean that the role of lubricant additives in forming tribofilms has become increasingly important to provide adequate surface protection against scuffing. However, the …
View article: A Novel Set-up for In-situ Measurement and Mapping of Lubricant Film Thickness in a Model Rolling Bearing Using Interferometry and Ratiometric Fluorescence Imaging
A Novel Set-up for In-situ Measurement and Mapping of Lubricant Film Thickness in a Model Rolling Bearing Using Interferometry and Ratiometric Fluorescence Imaging Open
This paper describes a unique experimental set-up constructed for studies of lubricant behaviour in an operating rolling element bearing including in-situ quantitative measurements of film thickness in and around the element-raceway contac…
View article: Prediction of Electric Vehicle Transmission Efficiency Using a New Thermally Coupled Lubrication Model
Prediction of Electric Vehicle Transmission Efficiency Using a New Thermally Coupled Lubrication Model Open
We present a new method to predict the power losses in electric vehicle (EV) transmission systems using a thermally coupled gearbox efficiency model. Friction losses in gear teeth contacts are predicted using an iterative procedure to acco…
View article: In-situ observation of the effect of the tribofilm growth on scuffing in rolling-sliding contact
In-situ observation of the effect of the tribofilm growth on scuffing in rolling-sliding contact Open
General reductions in lubricant viscosities in many machine components mean that the role of lubricant additives in forming tribofilms has become increasingly important to provide adequate surface protection against scuffing. However, the …
View article: The effect of friction on micropitting
The effect of friction on micropitting Open
Micropitting is a type of surface fatigue damage that occurs in rolling-sliding contacts operating under thin oil film conditions. It is caused by stress fluctuations, brought about by surface asperity interactions, which lead to initiatio…
View article: Influence of Black Oxide Coating on Micropitting and ZDDP Tribofilm Formation
Influence of Black Oxide Coating on Micropitting and ZDDP Tribofilm Formation Open
Micropitting is a type of surface fatigue damage that occurs in rolling-sliding contacts operating under thin oil film conditions. Application of black oxide (BO) coating to steel rubbing surfaces has been suggested as a potential approach…
View article: Fast laser surface texturing of spherical samples to improve the frictional performance of elasto-hydrodynamic lubricated contacts
Fast laser surface texturing of spherical samples to improve the frictional performance of elasto-hydrodynamic lubricated contacts Open
Textured surfaces offer the potential to promote friction and wear reduction by increasing the hydrodynamic pressure, fluid uptake, or acting as oil or debris reservoirs. However, texturing techniques often require additional manufacturing…
View article: ZDDP Tribofilm Formation on Non-Ferrous Surfaces
ZDDP Tribofilm Formation on Non-Ferrous Surfaces Open
The current trend for using lower viscosity lubricants with the aim of improving fuel economy of mechanical systems means that machine components are required to operate for longer periods in thin oil film, boundary and mixed lubrication c…
View article: Studies of Friction in Grease-Lubricated Rolling Bearings Using Ball-on-Disc and Full Bearing Tests
Studies of Friction in Grease-Lubricated Rolling Bearings Using Ball-on-Disc and Full Bearing Tests Open
This article evaluates the frictional performance of different bearing grease formulations in full rolling bearings and a ball-on-disc rig and subsequently assesses whether the ball-on-disc test results can be used to predict the grease pe…
View article: In-situ observations of the effect of the ZDDP tribofilm growth on micropitting
In-situ observations of the effect of the ZDDP tribofilm growth on micropitting Open
The ongoing trend for using ever lower viscosities of lubricating oils, with the aim of improving the efficiency of mechanical systems, means that machine components are required to operate for longer periods under thin film, mixed lubrica…
View article: The Influence of Slide–Roll Ratio on the Extent of Micropitting Damage in Rolling–Sliding Contacts Pertinent to Gear Applications
The Influence of Slide–Roll Ratio on the Extent of Micropitting Damage in Rolling–Sliding Contacts Pertinent to Gear Applications Open
Micropitting is a type of surface damage that occurs in rolling–sliding contacts operating under thin oil film, mixed lubrication conditions, such as those formed between meshing gear teeth. Like the more widely studied pitting damage, mic…