Publications_plugin - www.kubiak.uk

1.

Peta, Katarzyna; Kubiak, Krzysztof J.; Sfravara, Felice; Brown, Christopher A.

Dynamic wettability of complex fractal isotropic surfaces – Multiscale correlations Journal Article

In: Tribology International, vol. 214, 2026, ISSN: 0301-679X.

2.

Omar, Alaaeddin Al Sheikh; Ahmad, Khurshid; Lodhi, Ajay Pratap Singh; Wang, Chun; Kubiak, Krzysztof; Morina, Ardian

APTES nanofilm manufacturing using sliding interfaces Journal Article

In: Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, vol. 239, no. 9, pp. 1246–1257, 2025, ISSN: 2041-305X.

Abstract | Links | BibTeX | Tags: Tribology

3.

Duston, S; Oliver, R A; Kubiak, K J; Wang, Y; Wang, C; Morina, A

Tribological manufacturing of ZDDP tribofilms functionalised by graphene nanoplatelets Journal Article

In: J. Phys. Mater., vol. 7, no. 4, 2024, ISSN: 2515-7639.

Abstract | Links | BibTeX | Tags:

@article{Duston2024,

title = {Tribological manufacturing of ZDDP tribofilms functionalised by graphene nanoplatelets},

author = {S Duston and R A Oliver and K J Kubiak and Y Wang and C Wang and A Morina},

doi = {10.1088/2515-7639/ad6930},

issn = {2515-7639},

year  = {2024},

date = {2024-10-01},

journal = {J. Phys. Mater.},

volume = {7},

number = {4},

publisher = {IOP Publishing},

abstract = {Abstract

               3D Tribo-Nanoprinting (3D TNP), which uses a highly controllable tribological contact to deposit tribofilms, has been proposed as a manufacturing method for nanoscale structures. Inspired by this, we show for the first time, as a proof of concept, the ability to electrically functionalise tribofilms for potential use in the manufacture of structures with nanoscale thickness. Zinc dialkyldithiophosphate (ZDDP) tribofilms have been generated to include varying concentrations of graphene nanoplatelets (GNPs) resulting in them becoming electrically conductive when tested using conductive atomic force microscopy. In its highest GNP concentration, approximately 55% of the surface of the tribofilm was able to sustain current up to a threshold of 245 pA. The higher graphene content led to a suppression in film formation and decreased substrate coverage. Transmission electron microscopy revealed a dual-layered tribofilm with a carbon-rich layer above a pure layer of ZDDP tribofilm. Within the carbon-rich layer, the GNPs formed into scrolls which created an internal network through which current could flow, being limited by the insulating pure ZDDP layer at the film-substrate interface, and the presence of surface graphene sheets. A modified lateral force microscopy procedure supported the presence of surface graphene sheets. Despite limited deposition precision in terms of homogeneity and distribution of the tribofilms, this work provides a step towards the use of 3D TNP for the manufacture of electronic structures on the nanoscale by proving that tribofilms can be functionalised by the addition of particle additives.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

Close

4.

Wojciechowski, Ł.; Kubiak, K. J.; Boncel, S.; Marek, A.; Gapiński, B.; Runka, T.; Jędrysiak, R.; Ruczka, S.; Błaszkiewicz, P.; Mathia, T. G.

Towards the superlubricity of polymer–steel interfaces with ionic liquids and carbon nanotubes Journal Article

In: Tribology International, vol. 191, 2024, ISSN: 0301-679X.

Links | BibTeX | Tags:

5.

Rapiejko, Cezary; Mikusek, Dominik; Januszewicz, Bartłomiej; Kubiak, Krzysztof J.; Pacyniak, Tadeusz

Refinement of the Magnesium–Aluminium Alloy Microstructure with Zirconium Journal Article

In: Materials, vol. 15, no. 24, 2022, ISSN: 1996-1944.

Abstract | Links | BibTeX | Tags:

6.

Altwieb, Miftah; Mishra, Rakesh; Aliyu, Aliyu M.; Kubiak, Krzysztof J.

Heat Transfer Enhancement by Perforated and Louvred Fin Heat Exchangers Journal Article

In: Energies, vol. 15, no. 2, 2022, ISSN: 1996-1073.

Abstract | Links | BibTeX | Tags:

@article{Altwieb2022,

title = {Heat Transfer Enhancement by Perforated and Louvred Fin Heat Exchangers},

author = {Miftah Altwieb and Rakesh Mishra and Aliyu M. Aliyu and Krzysztof J. Kubiak},

doi = {10.3390/en15020400},

issn = {1996-1073},

year  = {2022},

date = {2022-01-00},

journal = {Energies},

volume = {15},

number = {2},

publisher = {MDPI AG},

abstract = {Multi-tube multi-fin heat exchangers are extensively used in various industries. In the current work, detailed experimental investigations were carried out to establish the flow/heat transfer characteristics in three distinct heat exchanger geometries. A novel perforated plain fin design was developed, and its performance was evaluated against standard plain and louvred fins designs. Experimental setups were designed, and the tests were carefully carried out which enabled quantification of the heat transfer and pressure drop characteristics. In the experiments the average velocity of air was varied in the range of 0.7 m/s to 4 m/s corresponding to Reynolds numbers of 600 to 2650. The water side flow rates in the tubes were kept at 0.12, 0.18, 0.24, 0.3, and 0.36 m3/h corresponding to Reynolds numbers between 6000 and 30,000. It was found that the louvred fins produced the highest heat transfer rate due to the availability of higher surface area, but it also produced the highest pressure drops. Conversely, while the new perforated design produced a slightly higher pressure drop than the plain fin design, it gave a higher value of heat transfer rate than the plain fin especially at the lower liquid flow rates. Specifically, the louvred fin gave consistently high pressure drops, up to 3 to 4 times more than the plain and perforated models at 4 m/s air flow, however, the heat transfer enhancement was only about 11% and 13% over the perforated and plain fin models, respectively. The mean heat transfer rate and pressure drops were used to calculate the Colburn and Fanning friction factors. Two novel semiempirical relationships were derived for the heat exchanger’s Fanning and Colburn factors as functions of the non-dimensional fin surface area and the Reynolds number. It was demonstrated that the Colburn and Fanning factors were predicted by the new correlations to within ±15% of the experiments.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

Close

7.

Gulati, Komal; Kubiak, Krzysztof

Create a Virtual Learning Environment to Test and Validate the behaviour of Autonomous Vehicles Proceedings

FISITA, 2021.

Abstract | Links | BibTeX | Tags:

@proceedings{2021,

title = {Create a Virtual Learning Environment to Test and Validate the behaviour of Autonomous Vehicles},

author = {Komal Gulati and Krzysztof Kubiak},

doi = {10.46720/f2021-acm-114},

year  = {2021},

date = {2021-09-30},

urldate = {2021-09-30},

publisher = {FISITA},

abstract = {\<jats:p\>"Climate change and the need for renewable energy are driving the development of electric and hybrid vehicles, however, concerns about road safety still remain. To address this issue and provide better safety and increased mobility there is a need for the development of autonomous vehicle technology and now the automotive industry is heading towards bringing fully autonomous vehicles on the public roads in the next few decades. The major concern with these technology-driven vehicles is testing of autonomous vehicles on public roads as no human intervention would be allowed while driving and this may involve some risk for the driver and the surrounding environment as any error or fault in the system may lead to damage of that environment, loss of manufacturing cost, time, energy and even severe accidents could lead to loss of life. In addition, these vehicles consist of more complex design than traditional vehicles and thus comparatively would require billions of miles of testing. Considering the above factors, the industry has come up with the solutions to test these vehicles in a virtual environment first using the software in the loop approach.   This concept is still in development and therefore this paper aims to develop a virtual learning environment where the performance of the control algorithms for an autonomous vehicle can be tested and validated under different driving scenarios.   Rigorous research was first carried out to find out the available testing methods and software for performing simulations using different algorithms imposed on the software model for object and path detection. Based on this review a modeling design approach was chosen to perform simulations in MATLAB software. Different driving test scenarios such as a roundabout and a parking lot were created in the Automated Driving System Toolbox and simulation was run in Simulink to test the behaviour of vehicle model in terms of Automated Emergency Braking, Lateral Control, Cruise Control and results were observed and analyzed in Bird’s Eye Scope view and in 3-Dimensional Environment using Unreal Engine. Sensor Fusion technique was used to obtain more precise and accurate results. Vehicle dynamics of the model were also tested in order to compare the stability of the vehicle on the basis of Kinematic and Dynamic Model respectively. The functionality provided by the software was fully explored and relevant results were presented. This paper is focusing on building a flexible virtual testing environment that can be easily deployed by SME’s and start-up companies to develop and test autonomous driving algorithms using the software in the loop approach."\</jats:p\>},

keywords = {},

pubstate = {published},

tppubtype = {proceedings}

}

Close

"Climate change and the need for renewable energy are driving the development of electric and hybrid vehicles, however, concerns about road safety still remain. To address this issue and provide better safety and increased mobility there is a need for the development of autonomous vehicle technology and now the automotive industry is heading towards bringing fully autonomous vehicles on the public roads in the next few decades. The major concern with these technology-driven vehicles is testing of autonomous vehicles on public roads as no human intervention would be allowed while driving and this may involve some risk for the driver and the surrounding environment as any error or fault in the system may lead to damage of that environment, loss of manufacturing cost, time, energy and even severe accidents could lead to loss of life. In addition, these vehicles consist of more complex design than traditional vehicles and thus comparatively would require billions of miles of testing. Considering the above factors, the industry has come up with the solutions to test these vehicles in a virtual environment first using the software in the loop approach. This concept is still in development and therefore this paper aims to develop a virtual learning environment where the performance of the control algorithms for an autonomous vehicle can be tested and validated under different driving scenarios. Rigorous research was first carried out to find out the available testing methods and software for performing simulations using different algorithms imposed on the software model for object and path detection. Based on this review a modeling design approach was chosen to perform simulations in MATLAB software. Different driving test scenarios such as a roundabout and a parking lot were created in the Automated Driving System Toolbox and simulation was run in Simulink to test the behaviour of vehicle model in terms of Automated Emergency Braking, Lateral Control, Cruise Control and results were observed and analyzed in Bird’s Eye Scope view and in 3-Dimensional Environment using Unreal Engine. Sensor Fusion technique was used to obtain more precise and accurate results. Vehicle dynamics of the model were also tested in order to compare the stability of the vehicle on the basis of Kinematic and Dynamic Model respectively. The functionality provided by the software was fully explored and relevant results were presented. This paper is focusing on building a flexible virtual testing environment that can be easily deployed by SME’s and start-up companies to develop and test autonomous driving algorithms using the software in the loop approach."

Close

8.

Wei, Dongbo; Li, Fengkun; Wei, Xiangfei; Liskiewicz, Tomasz; Kubiak, Krzysztof J; Zhang, Pingze

Microstructure, nano-mechanical characterization, and fretting wear behavior of plasma surface Cr-Nb alloying on γ-TiAl Journal Article

In: Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, vol. 235, no. 5, pp. 1012–1024, 2021, ISSN: 2041-305X.

Abstract | Links | BibTeX | Tags:

@article{Wei2020,

title = {Microstructure, nano-mechanical characterization, and fretting wear behavior of plasma surface Cr-Nb alloying on γ-TiAl},

author = {Dongbo Wei and Fengkun Li and Xiangfei Wei and Tomasz Liskiewicz and Krzysztof J Kubiak and Pingze Zhang},

doi = {10.1177/1350650120939835},

issn = {2041-305X},

year  = {2021},

date = {2021-05-00},

journal = {Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology},

volume = {235},

number = {5},

pages = {1012--1024},

publisher = {SAGE Publications},

abstract = { In this study, surface Cr-Nb alloying was realized on γ-TiAl using double glow plasma hollow cathode discharge technique. An inter-diffusion layer was generated under the surface, composed of Cr2Nb intermetallic compounds. After Cr-Nb alloying, the surface nanohardness of γ-TiAl increased from 5.65 to 11.61 GPa. The surface H/E and H3/E2 increased from 3.37 to 5.98 and from 0.64 to 4.15, respectively. Cr-Nb alloying and its effect on fretting wear were investigated. The surface treatment resulted in improved plastic deformation and fretting wear resistance of γ-TiAl. The fretting wear test showed that an average friction coefficient of γ-TiAl against Si3N4 ball was significantly decreased after Cr-Nb alloying. The fluctuation of friction coefficient during running-in stage was significantly improved. The friction behavior of both γ-TiAl before and after Cr-Nb alloying could be divided into distinctive stages including formation of debris, flaking, formation of crack, and delamination. It was observed that the high hardness, resistance to plastic deformation, and fatigue resistance of γ-TiAl after Cr-Nb alloying could inhibit the formation of debris and delamination during friction test. The fretting wear scar area and the maximum wear scar depth were decreased, indicating that the wear resistance of γ-TiAl has been greatly improved after Cr-Nb alloying. The results indicated that plasma surface Cr-Nb alloying is an effective way for improving the fretting wear resistance of γ-TiAl in aviation area. },

keywords = {},

pubstate = {published},

tppubtype = {article}

}