People

Wassim Habchi

Professor

Contact Information

Office: Bassil 404
Extension: 2233
Email: wassim.habchi@lau.edu.lb

Office Hours:
TR 11:00-12:30

Curriculum vitae

Research interests

Tribology, particularly Elastohydrodynamic lubrication and its numerical modelling using Finite Element Methods. This type of lubrication is usually encountered in rolling element bearing, gears, cam-followers and other types of moving elements. It involves extremely high contact pressures (reaching several GPa) and very thin lubricating films of a few nanometers. Contacting solids are deformed under such pressures and significant heat generation takes place within the lubricating films owing to the relatively small film thicknesses that are encountered. This problem is multiphysical in nature involving: hydrodynamics, solid mechanics, heat transfer, rheology…

List of publications

Books

  1. Habchi W. - Finite Element Modeling of Elastohydrodynamic Lubrication Problems, 2018, Wiley, Chichester, UK, ISBN: 978-1-119-22512-6. URL : http://eu.wiley.com/WileyCDA/WileyTitle/productCd-1119225124.html

BookCover_HabchiW-jan18-resized.jpg

Journal publications

  1. Bair S. and Habchi W. - Effects of a Typical Shear Dependent Viscosity on EHL Film Analytical Thickness Predictions: A Critical Issue for the Classical Approach, IMechE Part J - Journal of Engineering Tribology, (In Press).
  2. Issa J., El Hajj A., Vergne P. and Habchi W. - Machine Learning for Film Thickness Prediction in Elastohydrodynamic Lubricated Elliptical Contacts, Lubricants, 2023 (11), 497.
  3. Habchi W., Sperka P. and Bair S. - The Role of the Glass Transition for EHL Minimum Film Thickness, Tribology International, 2023, vol. 190 (12), 109061.
  4. Habchi W., Sperka P. and Bair S. - Is Elastohydrodynamic Minimum Film Thickness Truly Governed by Inlet Rheology?, Tribology Letters, 2023, vol. 71(3), 96.
  5. Habchi W. and Bair S. - Quantifying the Inlet Pressure and Shear Stress of Elastohydrodynamic Lubrication, Tribology International, 2023, vol. 182 (4), 108351.
  6. Issa J. S. and Habchi W. - Influence of Real Lubricant Density-Pressure Behavior on the Dynamic Response of Elastohydrodynamic Lubricated Conjunctions, ASME Journal of Tribology, 2023, vol. 145 (5), 054103.
  7. Bair S. and Habchi W. - The Role of Fragility in Thermal Elastohydrodynamics, Tribology Letters, 2023, vol. 71(1), 24.
  8. Habchi W. - On Roughness Attenuation in Elastohydrodynamic Lubricated Line and Circular Contacts, IMechE Part J - Journal of Engineering Tribology, 2023, vol. 237 (3), pp. 453-468.
  9. Mounayer J. and Habchi W. - Exact Model Order Reduction for the Full-System Finite Element Solution of Thermal Elastohydrodynamic Lubrication Problems, Lubricants, 2023, vol. 11, 61.
  10. Habchi W. - Thermal Elastohydrodynamic Lubrication of Axially Crowned Rollers, ASME Journal of Tribology, 2022, vol. 144 (6), 061602.
  11. Habchi W. - Influence of Roller-End Axial Profiling Type on Lubrication Performance in Thermal Elastohydrodynamic Finite Line Contacts, ASME Journal of Tribology, 2022, vol. 144 (1), 011601.
  12. Habchi W. and Vergne P. - A Quantitative Determination of Minimum Film Thickness in Elastohydrodynamic Circular Contacts, Tribology Letters, 2021, vol. 69 (4), 142.
  13. Bair S. and Habchi W. - Your EHD Rig May Not Be as Elastohydrodynamic as You Think, ASME Journal of Tribology, 2021, vol. 143 (8), 081601.
  14. Habchi W. - On the Negative Influence of Roller-End Axial Profiling on Friction in Thermal Elastohydrodynamic Lubricated Finite Line Contacts, ASME Journal of Tribology, 2020, vol. 142 (11), 111601.
  15. Issa J. S. and Habchi W. - Influence of Realistic Lubricant Density-Pressure Dependence on the Stiffness of Elastohydrodynamic Lubricated Contacts, ASME Journal of Tribology, 2020, vol. 142 (3), 031601.
  16. Habchi W. and Bair S. - The Role of the Thermal Conductivity of Steel in Quantitative Elastohydrodynamic Friction, Tribology International, 2020, vol.142, 105970.
  17. Habchi W. and Bair. S. – Is Viscoelasticity of any Relevance to Quantitative EHL Friction Predictions, Tribology International, 2019, vol. 135, pp. 96-103.
  18. Habchi W. - A Schur-Complement Model-Order-Reduction Technique for the Finite Element Solution of Transient Elastohydrodynamic Lubrication Problems, Advances in Engineering Software, 2019, vol. 127, pp. 28-37.
  19. Bair S., Habchi W., Baker M. and Pallister D. M. - Quantitative Elastohydrodynamic Film-Forming for an Oil/Refrigerant System, ASME Journal of Tribology, 2017, vol. 139 (6), 061501.
  20. Paulson N. R., Sadeghi F. and Habchi W. - A Coupled Finite Element EHL and Continuum Damage Mechanics Model for Rolling Contact Fatigue, Tribology International, 2017, vol. 107, pp. 173-183.
  21. Habchi W. and Bair S. - Effect of Lubricant Rheology on Friction in Coated Elastohydrodynamic Lubricated Contacts, IMechE Part J - Journal of Engineering Tribology, 2017, vol. 231 (8), pp. 975-985.
  22. Habchi W. and Issa J. S. - An Exact and General Model Order Reduction Technique for the Finite Element Solution of Elastohydrodynamic Lubrication Problems, ASME Journal of Tribology, 2017, vol. 139 (5), 051501. 
  23. Habchi W. - Coupling Strategies for Finite Element Modeling of Thermal Elastohydrodynamic Lubrication Problems, ASME Journal of Tribology, 2017, vol. 139 (4), 041501.
  24. Bair S., Habchi W., Sperka P. and Hartl M. – Quantitative Elastohydrodynamic Film Forming for a Gear Oil with Complex Shear-Thinning, IMechE Part J - Journal of Engineering Tribology, 2016, vol. 230 (3), pp. 289-299.
  25. Habchi W. - Thermal Analysis of Friction in Coated Elastohydrodynamic Circular Contacts, Tribology International, 2016, vol. 93 (Part B), pp. 530-538.
  26. Habchi W. - Influence of Thermo-Mechanical Properties of Coatings on Friction in Elastohydrodynamic Lubricated Contacts, Tribology International, 2015, vol. 90, pp. 113-122.
  27. Habchi W. and Vergne P. - On the Compressive Heating/Cooling Mechanism in Thermal Elastohydrodynamic Lubricated Contacts, Tribology International, 2015, vol. 88, pp. 143-152.
  28. Bair S., Vergne P., Kumar P., Poll G., Krupka I., Hartl M., Habchi W. and Larsson R. - Comment on “History, Origins and Prediction of Elastohydrodynamic Friction” by Spikes and Jie, Tribology Letters, 2015, vol. 58, 10.1007/s11249-015-0481-x.
  29. Habchi W. - A Numerical Model for the Solution of Thermal Elastohydrodynamic Lubrication in Coated Circular Contacts, Tribology International, 2014, vol. 73, pp. 57-68.
  30. Björling M., Habchi W., Bair S., Larsson R. and Marklund P. – Friction Reduction in Elastohydrodynamic Contacts by Thin Layer Thermal Insulation, Tribology Letters, 2014, vol. 53, pp. 477-486. Featured in the “Research Highlights Section” of Nature, vol. 505, Issue 7483: “Warm Carbon Coat Reduces Friction” (http://www.nature.com/nature/journal/v505/n7483/full/505264b.html).
  31. Habchi W. - Reduced Order Finite Element Model for Elastohydrodynamic Lubrication: Circular Contacts, Tribology International, 2014, vol. 71, pp. 98-108.
  32. Björling M., Habchi W., Bair S., Larsson R. and Marklund P. - Towards the True Prediction of EHL Friction, Tribology International, 2013, vol. 66, pp. 19-26.
  33. Habchi W., Bair S., Qureshi F. and Covitch M. – A Film Thickness Correction Formula for Double-Newtonian Shear-Thinning in Rolling EHL Circular Contacts, Tribology Letters, 2013, vol. 50 (1), pp. 59-66.
  34. Habchi W. and Issa J. – Fast and Reduced Full-System Finite Element Solution of EHL Problems: Line Contacts, Advances in Engineering Software, 2013, vol. 56, pp. 51-62.
  35. Habchi W. and Bair S. – Quantitative Compressibility Effects in Thermal Elastohydrodynamic Circular Contacts, ASME Journal of Tribology, 2013, vol. 135 (1), 011502.
  36. Habchi W., Bair S. and Vergne P. – On Friction Regimes in Quantitative Elastohydrodynamics, Tribology International, 2013, vol. 58, pp. 107-117.
  37. Habchi W., Eyheramendy D., Vergne P. and Morales-Espejel G. E. – Stabilized Fully-Coupled Finite Elements for Elastohydrodynamic Lubrication Problems, Advances in Engineering Software, 2012, vol. 46, pp. 4-18. 
  38. Habchi W., Vergne P., Fillot N., Bair S. and Morales-Espejel G. E. – A Numerical Investigation of Local Effects on the Global Behavior of TEHD Highly Loaded Circular Contacts, Tribology International, 2011, vol. 44, pp. 1987-1996.
  39. Habchi W., Vergne P., Eyheramendy D. and Morales-Espejel G. E. – Numerical Investigation of the Use of Machinery Low-Viscosity Working Fluids as Lubricants in Elastohydrodynamic Lubricated Point Contacts, IMechE Part J - Journal of Engineering Tribology, 2011, vol. 225, pp. 465 - 477.
  40. Habchi W., De Barros M. I., Joly-Pottuz L., Matta C., Martin J. M. and Vergne P. – Full Film, Boundary Lubrication and Tribochemistry in Steel Circular Contacts Lubricated with Glycerol, Tribology Letters, 2011, vol. 42, pp. 351-358.
  41. Akle B., Habchi W., Wallmersperger T., Akle E. and Leo D. – High Surface Area Electrodes in Ionic Polymer Transducers: Numerical and Experimental Investigations of the Electro-Chemical Behavior, Journal of Applied Physics, 2011, vol. 109, 074509.
  42. Habchi W., Vergne P., Bair S., Andersson O., Eyheramendy D. and Morales-Espejel G. E. – Influence of Pressure and Temperature Dependence of Thermal Properties of a Lubricant on the Behavior of Circular TEHD Contacts, Tribology International, 2010, vol. 43, pp. 1842-1850.
  43. Dormois H., Fillot N., Habchi W., Dalmaz G., Vergne P., Morales-Espejel G. E. and Ioannides E. – A Numerical Study of Friction in Isothermal EHD Rolling-Sliding Sphere-Plane Contacts with Spinning, ASME Journal of Tribology, 2010, vol. 132, 021501.
  44. Habchi W., Eyheramendy D., Bair S., Vergne P. and Morales-Espejel G. E. – Thermal Elastohydrodynamic Lubrication of Point Contacts Using a Newtonian/Generalized Newtonian Lubricant, Tribology Letters, 2008, vol. 30 (1), pp. 41-52.
  45. Habchi W., Eyheramendy D., Vergne P. and Morales-Espejel G. E. – A Full-System Approach of the Elastohydrodynamic Line/Point Contact Problem, ASME Journal of Tribology, 2008, vol. 130, 021501.
  46. Habchi W., Demirci I., Eyheramendy D., Morales-Espejel G. E. and Vergne P. – A Finite Element Approach of Thin Film Lubrication in Circular EHD Contacts, Tribology International, 2007, vol. 40, pp. 1466-1473.

Conferences

  1. Habchi W. - Gaussian Processes Regression: A Powerful Machine Learning Tool for Elastohydrodynamic Film Thickness Predictions, Invited Keynote Presentation at the 78th STLE Annual Meeting & Exhibition, May 18th-23rd 2024, Minneapolis, Minnesota, USA.
  2. Habchi W. - Roller-End Axial Profiling and its Negative Influence on Friction in Thermal Elastohydrodynamic Lubricated Finite Line Contacts, Proceedings of the 7th World Tribology Congress (WTC 2022), 2022, Lyon, France.
  3. Habchi W. and Bair S. - Lubricant Viscoelasticity: Is it of any Relevance to Quantitative EHL Friction Predictions? Proceedings of the 46th Leeds-Lyon Symposium on Tribology, 2019, Lyon, France.
  4. Habchi W. - A Schur-Complement Method for the Reduced Order Finite Element Modeling of Transient Elastohydrodynamic Lubrication Problems, Proceedings of the 10th International Conference on Engineering Computational Technology (ECT2018), 2018, Sitges, Spain.
  5. Bair S., Habchi W. and Baker M. - Quantitative Elastohydrodynamic Film-Forming for an Oil/Refrigerant System, Proceedings of the STLE 72nd Annual Meeting & Exhibition, 2017, Atlanta, USA.
  6. Habchi W. and Issa J. S. - Exact and General Reduced Order Finite Element Modeling of Elastohydrodynamic Lubrication Problems, Proceedings of the 6th World Tribology Congress (WTC 2017), 2017, Beijing, China.
  7. Habchi W. - A Fully-Coupled Finite Element Model for the Solution of Thermal Elastohydrodynamic Lubrication Problems, Proceedings of the STLE Tribology Frontiers Conference, 2016, Chicago, USA.
  8. Bair S., Habchi W., Sperka P. and Hartl M. – Quantitative Elastohydrodynamic Film Forming for a Gear Oil with Complex Shear-Thinning, Proceedings of the STLE Tribology Frontiers Conference, 2015, Denver, USA. 
  9. Habchi W. - Influence of Thermal and Mechanical Properties of Coatings on Friction in Elastohydrodynamic Contacts, Proceedings of the 42nd Leeds-Lyon Symposium on Tribology, 2015, Lyon, France.
  10. Habchi W. - A Numerical Model for Thermal Elastohydrodynamic Lubrication in Coated Circular Contacts, Proceedings of the 41st Leeds-Lyon Symposium on Tribology, 2014, Leeds, UK.   
  11. Akle B. and Habchi W. – Finite Element Analysis of the Sensing Behavior in Ionic Polymer Metal Composites: Introduction of the Streaming Potential, Proceedings of the 6th ECCOMAS Conference on Smart Structures and Materials, SMART 2013, Torino, Italy.  
  12. Habchi W. - Reduced Finite Element Elastohydrodynamic Lubrication Model: Circular Contacts, Proceedings of the 40th Leeds-Lyon Symposium on Tribology & Tribochemistry Forum 2013, Lyon, France.
  13. Akle B. and Habchi W. - Finite Element Modelling of the Sensing and Energy Harvesting Performance in Ionic Polymer Metal Composites, Proceedings of the SPIE Smart Structures NDE 2013, San Diego, USA.
  14. Habchi W., Bair S. and Vergne P. - Quantification of Friction Regimes in Elastohydrodynamic Lubrication, Proceedings of the 5th World Tribology Congress (WTC 2013), 2013, Torino, Italy.
  15. Vergne P., Fillot N., Habchi W., Bruyere V. and Doki-Thonon T. – Heat and Mass Transfer in Confined Lubricated Films, Poster presentation at the 9th International Conference on Flow Dynamics, 2012, Sendai, Japan. 
  16. Akle B., Habchi W., Abdelnour R., Blottman J. and Leo D. – Biologically Inspired Highly Efficient Buoyancy Engine, Proceedings of the SPIE Smart Structures NDE 2012, San Diego, USA.
  17. Akle B., Habchi W. and Wallmersperger T. - Mechano-Chemo-Electrical Finite Element Modelling of the Sensing Behavior of Ionic Polymer Metal Composites, Proceedings of the 8th International Conference on Engineering Computational Technology (ECT2012), 2012, Dubrovnik, Croatia.
  18. Habchi W. and Issa J. - Fast and Reduced Full-System Finite Element Solution of Line Contact Elastohydrodynamic Lubrication Problems, Proceedings of the 8th International Conference on Engineering Computational Technology (ECT2012), 2012, Dubrovnik, Croatia.
  19. Habchi W. and Issa J. - Model Order Reduction Techniques for the Solution of EHL Problems, Proceedings of the 38th Leeds-Lyon Symposium on Tribology, 2011, Lyon, France.
  20. Habchi W., Fillot N., Vergne P. and Morales-Espejel G. E. - A Local Investigation of the Thermophysical Behaviour of TEHL Contacts, Proceedings of the International Tribology ASIATRIB 2010 Congress, 2010, Perth, Australia.
  21. Habchi W. and Issa J. – A Reduced Full-System Finite Element Approach to the Solution of EHL Problems: Line Contacts, Proceedings of the 2010 ASME / STLE International Joint Tribology Conference, 2010, San Francisco, USA.
  22. Issa J. and Habchi W. – Vibration Suppression in a Cantilever Beam Using a String-Type Vibration Absorber, Proceedings of the ASME 2010 International Mechanical Engineering Congress and Exposition, 2010, Vancouver, Canada.
  23. Vergne P., Dormois H., Doki-Thonon Th., Fillot N., Habchi W. and Morales-Espejel G. – A Numerical Study of Friction in Isothermal EHD Rolling-Sliding Sphere-Plane Contacts with Spinning, Proceedings of the 2010 ASME / STLE International Joint Tribology Conference, 2010, San Fransisco, USA.
  24. Habchi W., Vergne P., Eyheramendy D. and Morales-Espejel G. E. – On the Use of Ultra-Low-Viscosity Fluids as Lubricants in EHL Contacts, Proceedings of the 37th Leeds-Lyon Symposium on Tribology, 2010, Leeds, UK.
  25. Akle B., Habchi W., Wallmersperger T. and Leo D. – Finite Element Modeling of the Electromechanical Coupling in Ionic Polymer Transducers, Proceedings of the SPIE Smart Structures NDE 2010, San Diego, USA.
  26. Fillot N., Doki-Thonon Th. and Habchi W. – The Full-System Approach for Elastohydrodynamic Lubrication, Proceedings of the COMSOL conference 2009, Boston, USA.
  27. Habchi W., Eyheramendy D., Vergne P. and Morales-Espejel G. E. -  A Finite Element Fully-Coupled Approach to Solve EHD Problems – How to Build an EHL Solver in Less than Ten Minutes, Proceedings of the 4th World Tribology Congress (WTC IV), 2009, Kyoto, Japan.
  28. Fillot N., Berro H., Habchi W. and Vergne P. – Complementary Scales and Models to Better Describe Lubricated Contacts, Keynote presentation at the 4th World Tribology Congress (WTC IV), 2009, Kyoto, Japan.
  29. Habchi W., Fillot N., Andersson O., Bair S., Eyheramendy D., Vergne P. and Morales-Espejel G. E. –  A Need for Relevant Multiphysics Modeling of EHD Problems: Application to Realistic Film Thickness and Friction Predictions, Proceedings of the 36th Leeds-Lyon Symposium on Tribology, 2009, Lyon, France.
  30. Habchi W., Eyheramendy D., Vergne P. and Morales-Espejel G. E. – Friction and Film Thickness in Heavily Loaded Circular Contacts Operating Under Thermal Elastohydrodynamic Regime, Proceedings of the 35th Leeds-Lyon Symposium on Tribology, 2008, Leeds, UK.
  31. Habchi W., Eyheramendy D., Vergne P. and Morales-Espejel G. E. – Stabilized Finite Elements for Elastohydrodynamic Lubrication Problems, Proceedings of the 6th International Conference on Engineering Computational Technology, 2008, Athens, Greece.
  32. Habchi W., Eyheramendy D., Bair S., Vergne P. and Morales-Espejel G. E. – A Finite Element Approach of the Fully Coupled Elastohydrodynamic Problem, Proceedings of the ASME / STLE International Joint Tribology Conference, 2007, San Diego, USA.
  33. Habchi W., Demirci I., Eyheramendy D., Morales-Espejel G. E. and Vergne P. – A Finite Element Approach of Thin Film Lubrication in Circular EHD Contacts, Proceedings of the 33rd Leeds-Lyon Symposium on Tribology, 2006, Leeds, UK

Awards

  • Young Researcher best paper award for the paper “Stabilized Finite Elements for Elastohydrodynamic Lubrication Problems”, presented at the 6th International Conference on Engineering Computational Technology.
  • INSA de Lyon, PhD of the year award for the year 2008.

Academic degrees

Ph.D., Mechanical Engineering, Institut National des Sciences Appliquees de Lyon (INSA), France, 2008
M.E., Fluid Mechanics and Energetics, Universite Pierre Et Marie Curie - Paris VI, France, 2005
Diplome, Mechanical Engineering, Lebanese University, Lebanon, 2005