Surface deformations measured by laser profilometry in a contact model metal punch-sapphire window yield pressure distribution if the contact area is known. This paper advances a new method to assess this area by reflectivity. The contact model possesses higher reflectivity outside the contact area than inside, the step evidencing contact contour. A correction for interference effects is derived. Experimental results on circular Hertz contacts agree well with theoretical predictions.

1.
Glovnea
,
M. L.
, 1999, “
The Effect of Geometric Surface Discontinuities upon the Elastic Contact
,” Ph.D. thesis, University of Suceava, Romania.
2.
Diaconescu
,
E. N.
, and
Glovnea
,
M. L.
, 2002, “
Evaluation of Contact Area by Reflectivity
,”
Proc. 3rd AIMETA International Tribology Conference
,
Italy, 8 pp. on CD.
3.
Born
,
M.
, and
Wolf
,
E.
, 1980,
Principles of Optics
,
6th ed.
,
Pergamon Press
, Oxford, pp.
1
14
,
Born
,
M.
, and
Wolf
,
E.
, 1980,
Principles of Optics
,
6th ed.
,
Pergamon Press
, Oxford, pp.
23
,
Born
,
M.
, and
Wolf
,
E.
, 1980,
Principles of Optics
,
6th ed.
,
Pergamon Press
, Oxford, pp.
24
,
Born
,
M.
, and
Wolf
,
E.
, 1980,
Principles of Optics
,
6th ed.
,
Pergamon Press
, Oxford, pp.
36
45
.
4.
Ditchburn
,
R. W.
, 1963,
Light, II
,
2nd ed.
,
Blackie and Son
, London, pp.
549
558
.
5.
Savelyev
,
I. V.
, 1989,
Physics—a General Course, II, Electricity and Magnetism. Waves. Optics
,
MIR Publishers
, Moscow, pp.
319
.
6.
Moisil
,
G. C.
, and
Curatu
,
E.
, 1986,
Optics—Theory and Applications
, (in Romanian)
Technical Publishing House
, Bucharest, pp.
79
87
,
Moisil
,
G. C.
, and
Curatu
,
E.
, 1986,
Optics—Theory and Applications
, (in Romanian)
Technical Publishing House
, Bucharest, pp.
92
98
.
You do not currently have access to this content.