Implementation of Digital Image processing in Calculating Normal Approach for Spherical Indenter Considering Elastic/Plastic Contact
Main Article Content
Abstract
In this work a study and calculation of the normal approach between two bodies,
spherical and rough flat surface, had been conducted by the aid of image processing
technique. Four kinds of metals of different work hardening index had been used as a
surface specimens and by capturing images of resolution of 0.006565 mm/pixel a good estimate of the normal approach may be obtained the compression tests had been done in strength of material laboratory in mechanical engineering department, a Monsanto tensometer had been used to conduct the indentation tests. A light section measuring equipment microscope BK 70x50 was used to calculate the surface parameters of the texture profile like standard deviation of asperity peak heights, centre line average, asperity density and the radius of asperities. A Gaussian distribution of asperity peak height was assumed in calculating the theoretical value of the normal approach in the elastic and plastic regions and where compared with those obtained experimentally to verify the obtained results.
Article Details
How to Cite
Publication Dates
References
Ahmed A.A. “ Contact mechanics of rough engineering surfaces” a thesis submitted to the college of engineering university of Baghdad 1993.
Halling J. , and Nuri K.A. 1988 , “the elastic – plastic contact of rough surfaces and its relevance in the study of wear” Proc. Inst. Mech. Eng. Part c; J. Mech. Eng. Sci., 202(c4)pp. 269-274.
Halling J. “A contribution to the theory of mechanical wear” 1975,wear,34,pp239- 249.
Halling J. “Principles of tribology” 1975, Macmillan press LTD.
Kucharski S., Kilmezak T., Palijanink J. and Kaczmarck J., 1994 “ Finite element model for the contact of rough surfaces.” Wear 177,pp1-13.
Nuri K.A., 1974, “ The normal approach between curved surfaces in contact Wear,30,pp.321-335.
Powierza Z.H., Klimezak T., and Polijanink A., 1992, “ On the experimental verification of the Greenwood-Williamson model for the contact of rough surface” Wear,154,pp. 115- 124.
Pullen J.,and Williamson J.B.P., 1972 “ On the plastic of rough surface” Proc. R. Soc. London Ser. A: A327 pp159-173.
Rafael C. Gonzalez , Richard E. Woods and Steven L. Eddins“digital image processing using Matlab” 2004, Pearson international edition. Rafael C. Gonzalez and Richard E. Woods “digital image processing” 2008, Pearson international edition, third edition.
Samarasingle S., & Kvlasiri,G.D. 2000, displacement fields of wood in tension based on image processing . Silva Fennica 34(3);251-273.
Sutton , M.A., Wolters , W.J., Peters, W.H., Rawson , W.F. & Mc Neill, S.R., 1983, Determination of displacements using an improved digital image correlation method. Image and vision computing 1(3); 133-139.
William F. Hosford and Robert M. Caddel “ Metal forming mechanics and metallurgy” 1983,PrenticeHall, Inc., Englewood Cliffs
Zhao Y., Maietia D.M. , and Chi I. , 2000 “ An asperity micro contact model incorporating the transition from elastic deformation to
fully plastic flow.”ASME, J., Tribol., 122(1),pp.86-93.