**52. Nikas,
G. K. ****Particle entrapment in elliptical, elastohydrodynamic,
rough contacts and the influence of intermolecular (van der
Waals) forces****. **Proceedings of the
Institution of Mechanical Engineers, Part J: Journal of Engineering
Tribology, 2021; in press.

**51. Nikas,
G. K. ****Particle entrapment in line elastohydrodynamic
contacts and the influence of intermolecular (van der Waals)
forces****.
**Lubricants, 2020, 8(5), article 60.

**50. Nikas,
G. K. ****Profile
optimization of hydraulic, polymeric, sliding seals by
minimizing an objective function of leakage, friction and
abrasive wear****.
**Lubricants, 2020, 8(4), article 40.

**49. Nikas,
G. K.** Parametric and
optimisation study of rectangular-rounded, hydraulic, elastomeric,
reciprocating seals at temperatures between –54 and +135 °C.
Lubricants, 2018, 6(3), article 77.** **

**48. Nikas, G. K. Fast
performance-analysis of rectangular-rounded hydraulic
reciprocating seals: mathematical model and experimental
validation at temperatures betwee****n –54
and +135 °C****.
**Tribology International, 2018, 128,
34-51.** **

**47. Nikas, G. K. Friction
and wear of seals. **ASM
Handbook Vol. 18 - Friction, Lubrication, and Wear Technology (Ed.: G.
Totten), pp. 957-968. ASM International, Ohio, USA, 2017.

**46. Nikas, G. K. Miscalculation of film
thickness, friction and contact efficiency by ignoring
tangential tractions in elastohydrodynamic contacts.
**Tribology
International, 2017, 110, 252-263.

**45. Nikas, G. K. Particle
extrusion in elastohydrodynamic line contacts: dynamic forces
and energy consumption. ** Proceedings
of the Institution of Mechanical Engineers, Part J: Journal of
Engineering Tribology, 2017, 231(10), 1320-1340.

**44. Nikas, G. K. Algebraic
equations for the pile-up geometry in debris particle indentation
of rolling elastohydrodynamic contacts. **ASME Journal of Tribology, 2016, 138(2),
021503-14.

**43. Nikas, G. K. Modeling dark and white layer
formation on elastohydrodynamically lubricated steel surfaces by
thermomechanical indentation or abrasion by metallic particles.**
ASME Journal of Tribology, 2015, 137(3),
031504-20.

**42. Nikas, G. K., Almond,
R. V., Burridge, G. Experimental
study of leakage and friction of rectangular, elastomeric,
hydraulic seals for reciprocating motion from –54
to +135 °C and pressures from 3.4 to 34.5 MPa. **Tribology Transactions, 2014, 57(5), 846-865.

**41. Nikas, G. K. Strain-rate effects on the plastic indentation and
abrasion of elastohydrodynamic contacts by debris particles.
**Proceedings of the Institution of
Mechanical Engineers, Part J: Journal of Engineering Tribology, 2014,
228(1), 22-45.

**40. Nikas, G. K. Debris particle indentation and abrasion of
machine-element contacts: an experimentally validated,
thermoelastoplastic numerical model with micro-hardness and
frictional heating effects. ** Proceedings
of the Institution of Mechanical Engineers, Part J: Journal of
Engineering Tribology, 2013, 227(6), 579-617.

**39. Nikas, G. K. An experimentally validated numerical model of
indentation and abrasion by debris particles in machine-element
contacts considering micro-hardness effects. **Proceedings of the Institution of Mechanical
Engineers, Part J: Journal of Engineering Tribology, 2012, 226(5),
406-438.

**38. Nikas, G. K. **(Ed.)**
Recent Developments in Wear Prevention, Friction
and Lubrication. **Research
Signpost, Kerala, India, 2010.

**37. Nikas, G. K. A state-of-the-art review on the effects of
particulate contamination and related topics in machine-element
contacts. **Proceedings
of the Institution of Mechanical Engineers, Part J: Journal of
Engineering Tribology, 2010, 224(5), 453-479.

**36. Nikas, G. K.
Eighty years of research on hydraulic
reciprocating seals: review of tribological studies and
related topics since the 1930s.**
Proceedings of the Institution of Mechanical
Engineers, Part J: Journal of Engineering Tribology, 2010, 224(1), 1-23.

**35. Nikas, G. K. Review of studies on the detrimental effects of
solid contaminants in lubricated machine element contacts. **First
chapter (pp. 1-44) in the book entitled "Reliability Engineering
Advances" (Ed.: G. I. Hayworth). Nova Science Publishers, New York, USA,
2009.

34. Reddyhoff, T., Underwood, R. J., Nikas, G. K., Sayles, R. S., Spikes, H. A. Thermal aspects of debris in EHL contacts. Proceedings of the Fourth World Tribology Congress, 6-11 September 2009, Kyoto, Japan, paper C1-222, p. 308.

**33. Nikas, G. K., Sayles, R. S.
Surface coatings and
finite-element analysis of layered fretting contacts. **Proceedings
of the Institution of Mechanical Engineers, Part J: Journal of
Engineering Tribology, 2009, 223(2), 159-181.

**32. Nikas, G. K. Research
on the tribology of hydraulic reciprocating seals.** First
chapter (pp. 11-56) in the book entitled "Tribology Research Trends"
(Ed.: T. Hasegawa). Nova Science Publishers, New York, USA, 2008.

**31. Nikas, G. K., Sayles, R. S.
Finite-element analysis of
layered rolling contacts. **Proceedings
of the Institution of Mechanical Engineers, Part J: Journal of
Engineering Tribology, 2008, 222(7), 865-886.

**30. Nikas, G. K., Sayles, R. S.
A study of lubrication mechanisms using two-phase
fluids with porous bearing materials. **Proceedings of the Institution of Mechanical
Engineers, Part J: Journal of Engineering Tribology, 2008, 222(6),
771-783.

**29. Nikas, G. K.
Fundamentals of sealing and tribology
of hydraulic reciprocating seals.
**Proceedings of the
1-day seminar "Focus on Reciprocating Seals", organised by the Tribology
Group of the Institution of Mechanical Engineers, London, England, 25
June 2008.

**28. Nikas, G. K. Effects of operating conditions
and friction on the entrapment of spherical debris particles in
elliptical contacts. **Proceedings
of the Institution of Mechanical Engineers, Part J: Journal of
Engineering Tribology, 2007, 221(6), 727-741.

**27. Nikas, G. K., Burridge, G.,
Sayles, R. S. Modelling and optimization of
rotary vane seals. **Proceedings
of the Institution of Mechanical Engineers, Part J: Journal of
Engineering Tribology, 2007, 221(6), 699-715.

**26. Nikas, G. K.
A mechanistic model of
spherical particle entrapment in elliptical contacts. **Proceedings
of the Institution of Mechanical Engineers, Part J: Journal of
Engineering Tribology, 2006, 220(6), 507-522.

**25. Nikas, G. K., Sayles, R. S.
Modelling and optimization of
composite rectangular reciprocating seals.
**Proceedings of the
Institution of Mechanical Engineers, Part J: Journal of Engineering
Tribology, 2006, 220(4), 395-412.

**24.
Nikas, G. K. Boussinesq-Cerruti functions and a simple
technique for substantial acceleration of subsurface stress
computations in elastic half-spaces.
**
Proceedings of the Institution of Mechanical Engineers, Part J: Journal
of Engineering Tribology, 2006, 220(1), 19-28.

23. Nikas, G. K., Sayles, R. S. Study of leakage and friction of flexible seals for steady motion via a numerical approximation method. Tribology International, 2006, 39(9), 921-936.

**22.**
Nikas, G. K., Sayles, R. S. Computational model of tandem
rectangular elastomeric seals for reciprocating motion. Tribology International, 2006, 39(7), 622-634.

** 21. Nikas, G. K., Sayles,
R. S. Nonlinear elasticity of rectangular
elastomeric seals and its effect on elastohydrodynamic
numerical analysis. **Sealing
Technology, 2005, 2005(3), 6-11. Featured article, based on a previous
paper of the authors; invited and compiled by Mr R. Flitney, Editor of
Sealing Technology.

** 20. Nikas, G. K. Theoretical study of solid back-up rings for
elastomeric seals in hydraulic actuators. **Tribology International, 2004, 37(9), 689-699.

** 19. Nikas, G. K., Sayles,
R. S. Nonlinear elasticity of rectangular
elastomeric seals and its effect on elastohydrodynamic
numerical analysis. **Tribology
International, 2004, 37(8), 651-660.

** 18. Nikas, G. K. Transient
elastohydrodynamic lubrication of rectangular elastomeric seals for
linear hydraulic actuators. **Proceedings
of the Institution of Mechanical Engineers, Part J: Journal of
Engineering Tribology, 2003, 217(6), 461-473.

** 17. Nikas, G. K. Analytical
study of the extrusion of rectangular elastomeric seals for linear
hydraulic actuators. **Proceedings
of the Institution of Mechanical Engineers, Part J: Journal of
Engineering Tribology, 2003, 217(5), 365-373.

** 16. Nikas, G. K. Elastohydrodynamics
and mechanics of rectangular elastomeric seals for reciprocating
piston rods. **ASME Journal
of Tribology, 2003, 125(1), 60-69.

** 15. Nikas, G. K. Fatigue
life and traction modelling of continuously variable transmissions.
**ASME Journal of Tribology, 2002,
124(4), 689-698.

** 14. Nikas, G. K. Particle
entrainment in elastohydrodynamic point contacts and related risks
of oil starvation and surface indentation. **ASME
Journal of Tribology, 2002, 124(3), 461-467.

** 13. Rana, A., Sayles, R.,
Nikas, G., Jalisi, I. An experimental technique for
investigating the sealing principles of reciprocating elastomeric
seals for use in linear hydraulic actuator assemblies. **Proceedings of the 2nd World Tribology Congress, 3-7
September 2001, Vienna, Austria.

** 12. Nikas, G. K. An
advanced model to study the possible thermomechanical damage of
lubricated sliding-rolling line contacts from soft particles. **ASME Journal of Tribology, 2001, 123(4), 828-841.

** 11. Nikas, G. K. Mathematical
analysis of the entrapment of solid spherical particles in
non-conformal contacts.
**ASME Journal of Tribology,
2001, 123(1), 83-93.

**
10. Nikas, G. K. Theoretical modelling of the
entrainment and thermomechanical effects of contamination particles
in elastohydrodynamic contacts****. **Ph.D.
and D.I.C. thesis, Imperial College London and Science Museum Library,
also in the Mechanical Engineering Department Library and in the
Tribology Group, Imperial College London, England, 1999.

** 9. Nikas, G. K., Sayles,
R. S., Ioannides, E. Thermoelastic distortion of EHD
line contacts during the passage of soft debris particles. **ASME Journal of Tribology, 1999, 121(2), 265-271.

** 8. Nikas, G. K.,
Ioannides, E., Sayles, R. S. Thermal modelling and effects
from debris particles in sliding/rolling EHD line contacts - A
possible local scuffing mode. **ASME
Journal of Tribology, 1999, 121(2), 272-281.

** 7. Nikas, G. K., Sayles,
R. S., Ioannides, E. Effects of debris particles in
sliding/rolling elastohydrodynamic contacts. ** Proceedings of the Institution of Mechanical
Engineers, Part J: Journal of Engineering Tribology, 1998, 212(5),
333-343.

** 6. Nikas, G. K., Sayles,
R. S., Ioannides, E. Effects of debris particles in
sliding/rolling EHD contacts. **Proceedings
of the First World Tribology Congress, 8-12 September 1997, London,
England, p. 271.

** 5. Nikas, G. K. Elastohydrodynamic
lubrication - a qualitative approach to the problem. **Journal of the Hellenic Association of Mechanical and
Electrical Engineers, 1997, 302, 61-62.

** 4. Nikas, G. K. Load
sharing and profile modification of spur gear teeth in the general
case of any flank geometry. **Proceedings
of the International Conference on Gears, 22-24 April 1996, Dresden,
Germany, VDI Berichte 1230, pp. 923-935.

** 3. Costopoulos, T., Nikas ,
G. K. Minimization of spur gear dynamic loading through
the generalized theory of gearing. **Proceedings
of the International Congress - Gear Transmissions 95, 26-28 September
1995, Sofia, Bulgaria, vol. 1, pp. 52-56.

** 2. Nikas, G. K.,
Costopoulos, T. Generalized theory of gearing and
elastohydrodynamic lubrication of spur gears. **Proceedings of the International Congress - Gear
Transmissions 95, 26-28 September 1995, Sofia, Bulgaria, vol. 1, pp.
118-123.

** 1. Nikas, G. K. Elastohydrodynamic
lubrication and minimization of the dynamic loading of spur gears.
**Mechanical
Engineering Diploma thesis in Greek. National Technical University of
Athens, Greece, 1994.