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 Expert  108495

Expert in Mechanical Engineering, Tribology, Rheology

Available for your Consulting and Expert Witness Needs

Georgia (GA)
Education Work History Career AccomplishmentsPublicationsConsulting Services Expert Witness

Summary of Expertise: Listed with other top experts in: 
Expert has devoted his career to research and teaching in the areas of friction, lubrication, and wear since 1961. He adds that these subjects have been collectively known as tribology for the past 25 years. His interests cover a wide range of tribology subjects. These include high pressure lubricant rheology, wear control, tribomaterial evaluation, concentrated contact lubrication (elastohydrodynamic lubrication), thermal effects in tribology, the economic impact of tribology, and the assessment of advertising claims in relationship to product performance. He has had considerable experience in tribosimulation, which he explains is the laboratory simulation of a tribosystem to diagnose problems or to predict performance. Expert's research also has been concerned with ceramic tribomaterials and the lubrication of them. He has been especially interested in their behavior at high temperatures and the rheology of lubricants at high pressures. He collaborates extensively with scientists and engineers in other fields on problems in tribology. Expert directs research funded by government and industry in his field of expertise, and consults in industry and government, and on legal cases. He is also very knowledgeable in areas of rheological measurements of liquids (especially at high pressure), tribological behavior of materials and systems, infrared measurement of temperatures, and thin films. He has also expanded his activities to diagnostics of mechanical systems.


A significant portion of Expert's research career has been dedicated to the study of wear and wear control. This has included both lubricated and unlubricated wear, wear in the presence of solid lubricants, and wear of solid polymers or metals. In recent years, much of his research has been devoted to understanding the mechanism of thermomechanical wear. This phenomenon occurs when the combined surface stress and the temperature elevation resulting from frictional heating cause the mechanical properties of the surface to degrade and allow the material to yield. In 1980, Expert co-edited the ASME Wear Control Handbook with Marshall Peterson. It contains over 1300 pages with contributions by over 30 authors and gives extensive information on wear in engineering systems.

material wear

Expert defines a lubricant as a material (liquid, solid, or gas) introduced between two surfaces moving in relative motion to reduce friction and wear. His interest in lubrication stems from its role as a major mechanism of wear control. Much of his career has been devoted to understanding the many mechanisms of lubrication and the behavior of lubricants. Expert has had considerable experience in the development of laboratory systems to simulate tribosystems in machinery. Through careful laboratory system development, the larger scale system, such as that of the 12-inch diameter journal bearing in a 70 megawatt gas turbine, can be studied in the laboratory and predictive field performance information can be generated.



lubrication process


wear prevention


wear-control lubrication

Expert defines rheology as the study of the flow and deformation behavior of materials. He notes that lubricants are subjected to the very high strain rates of more than a million reciprocal seconds. He adds that in concentrated contacts, such as gears and rolling element bearings, very high pressures are generated which range from 100 to 300 thousand pounds per square inch. The object of Expert's research for nearly 3 decades has been the measurement of viscosity and the limiting shear stress of lubricants under these conditions. He has measured viscosity pressure behavior of a large number of lubricants, as well as their limiting shear stresses. He has also studied the relationship between these rheological properties and the chemical composition of lubricants.

lubricant rheology

Expert notes that the resistance to relative motion is often referred to as friction. However, in situations where that resistance is to be maximized it is also referred to as traction. He has extensively studied the friction/traction in concentrated contacts. These occur in cams, gears, and rolling bearings where the resistance is often a function of the rheological properties of the lubricant (the limiting shear stress). He has also studied the friction/traction in other systems, such as brakes and clutches, in his laboratory.

traction (friction)



The technology to measure incipient failure of mechanical systems and the methodology of determining the remaining life of the machinery has been a major area of interest to Expert for the past five years.

mechanical system

Show Secondary and Basic Areas of Expertise
Expert may consult nationally and internationally, and is also local to the following cities: Atlanta, Georgia;  Athens, Georgia;  Macon, Georgia;  Roswell, Georgia;  Marietta, Georgia;  and Chattanooga, Tennessee.

Often requested
with this expert:

Tribology, Wear, Coatings, Materials Selection, Materials...
Friction, Tribology, and Wear
Friction and Wear Reduction, Biomechanics
Friction, Lubrication, and Machining

Year   Degree   Subject   Institution  
1964   PhD   Physics   Cambridge University, England  
1961   PhD   Mechanical Engineering   University of Michigan  
1959   MS   Engineering   University of Michigan  
1958   BS   Engineering   University of Michigan  

Work History:
Years   Employer   Title  

1998 to




Eugene C. G. Wattney, Jr., Chair in Manufacturing


1988 to




Chair, Woodruff School of Mechanical Engineering


1969 to




Regents Professor, School of Mechancal Enginering


1963 to 1969


University of Michigan


Assistant and Associate Professor, School of Mechanical Engineering


Career Accomplishments:

He is is an elected member to the National Academy of Engineering.

Professional Appointments

Expert was Technical Editor at ASME Transactions of the Journal of Tribology (formerly Journal of Lubrication Technology) from July 1980 to June 1987. He was editor for the Americas for Tribology International.


Expert is a Fellow of the ASME and a recipient of the ASME Melville Award (1975), the ASME Mayo D. Hersey Award (1986), and the ASME Charles Russ Richards Memorial Award. He has also received the NLGI Clarence E. Earl Award (1979) and the Sigma Xi Award for Sustained Research (1975). He was named Faculty Member of the Year (1986) by the Expert's Firm Graduate Student Government.

Publications and Patents Summary

He is author or co-author of more than 200 technical papers and reports.

Selected Publications and Publishers  
 - Journal of Tribology, ASME  
 - Materials Research Society Symposium Proceedings  
 - MRS  
 - Wear Control Handbook, American Society of Mechanical Engineers (ASME)  

Consulting Services:
Recent Client Requests:
  • Expert for consulting on Selection of lubricants for high temperature downhole motors.
  • Adhesion wear expert for consulting on galling prevention.
  • Expert in pseudo plastic fluids for consulting on theological properties to disperse in air when it exits a wide tube at very high speed.
  • Expert in Friction at pin/bushing interface.
Click the green button above to contact Expert for a free initial screening call regarding your expert consulting needs.  Expert is available for consulting to corporate, legal and government clients.  Remember, your initial screening call to speak with Expert is free.

Expert Witness:
Recent Litigation Client Requests:
  • Tribology expert for consulting on Litigation against BMW North America.
Click the green button above to contact Expert for a free initial screening call regarding expert testimony, litigation consulting and support, forensic services, or any related expert witness services.  A few litigation needs include product liability, personal injury, economic loss, intellectual property (patent, trademark, trade secret, copyright), and insurance matters.  Remember, your initial screening call to speak with Expert is free.


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