EXPERIMENTAL SET-UP AND
PRELIMINARY RESULTS UPON A NEW TECHNIQUE TO MEASURE CONTACT PRESSURE
Department of Mechanical Engineering, University of Suceava,
Glovnea and Petrosel  proposed a new technique to measure the
pressure in real contacts. One of contacting surfaces is covered,
prior to contact establishment, by a special gel. The contact
closing removes the excess gel and, during a certain time interval,
the contact pressure transforms the entrapped substance in an
amorphous solid. In each point, the refractive index of this solid
depends on the pressure acting during transformation. After contact
opening, the reflectivity of this coating depends on the former
contact pressure. Mapped by aid of a laser profilometer, it becomes
an indicator of contact pressure.
The existing device used to load the contacts has a series of
shortcomings. This paper proposes a new experimental set-up that can
be used to load contacts with gel at the interface, and illustrates
a few experimental results.
contact pressure, refractive index, reflectivity, experimental
Diaconescu, E. N.,
Glovnea, M. L., Petroşel, O.,
2003, “A New Experimental Technique to Measure Contact
Pressure,” Proc. of 2003 STLE/ASME Joint International
Tribology Conference, Ponte Vedra Beach, Florida USA.
Glovnea, M.L., 2002, “Evaluation of Contact Area by
Reflectivity,” Proc. of 3rd AIMETA International Tribology
Conference, Italy, on CD.
Diaconescu, E.N., 1994, “A New Method for Experimental
Investigation of Elastic Contacts,” (in Romanian), Symp. on
Tradition and Continuity in Railway Research, Vol.II,
Bucharest, pp. 77-82.
1998, “A New Tool for Experimental Investigation of Mechanical
Contacts, Part I: Principles of Investigation Method”, VAREHD
9, Suceava, pp. 255-260.
Glovnea, M.L., 1998, “A New Tool for Experimental
Investigation of Mechanical Contacts, Part II: Experimental
Set-up and Preliminary Results”, VAREHD 9, Suceava, pp.
Glovnea, M.L., 2000, “Validation of Reflectivity as an
Experimental Tool in Contact Mechanics”, VAREHD 10,
Suceava, pp. 471 – 476.
2006, “Visualization and Measurement of Contact Area by
Reflectivity,” Transactions of the ASME, Journal of Tribology,
Vol. 128, October 2006, 915 – 917.
and Abraha, P., 1990, “Measurement of
Pressure on Contact Surface by Reflection of Light (Effect of
Surface Etching),” Proceedings of the Japan International
Tribology Conference, Nagoya, pp. 1271-1276.
and Abraha, P., 1997, “Measurement of the
Pressure Distribution on Contact Surfaces by the Detection of a
Transferred Oil Film”, Surface Science 377–379 (1997)