Article Article
Roughness Measurement Parameters by the Eddy Current Technique

Roughness parameters are important characteristics in the manufacturing and friction of materials. Variations in the roughness parameters during motion can be used to estimate the longevity of rubbed surfaces. In the Theoretical Background section of this paper, the feasibility of using the eddy current technique for measuring the roughness parameters of nonferrous and ferrous metals, and specifically steel surfaces, is demonstrated. Eddy current tests were performed using a commercial manual flaw detector with pencil probes. In the Experimental Procedure sections, the roughness parameters of ferrous and nonferrous metals were evaluated in static conditions using eddy current technique measurements. Eddy current technique data were compared with the values of the roughness parameters measured by a profilograph. Good correlation was obtained between the eddy current technique and profilograph measurements. Finally, the roughness parameters were evaluated under dynamic conditions during friction tests. The results confirmed the applicability of the eddy current technique for measuring the roughness parameters both under static and dynamic conditions. The new methodology and a probe holder design for estimation of roughness parameters in static and dynamic conditions were developed. This methodology excludes the noise factors in the roughness measurement parameters.

Avner, S. H., Introduction to Physical Metallurgy, McGraw Hill, Tokyo, Japan, 1974, p. 371. Beda, P., B. Vibornov, Y. Glaskov, S. Luzko, G. Samoilovich and G. Shelichov, Non-destructive Inspection of Metals and Production Handbook, Machine Building Publishers, Moscow, Russia, 1976, p. 465. Bilik, Y. Z. and A. L. Dorofeev. “Proba-type Electromagnetic Inspection Instruments,” Nondestructive Testing, Vol. 17, No. 6, Plenum Publishing Corporation, 1982, pp. 447–451. Bilik, Y., E. Keydar and V. Boroda, “New Eddy Current Technique for Printed Circuit Board Control,” Materials Evaluation, Vol. 64, No. 8, 2006, pp. 775–777. Bilik, Y. and I. Roitburd, “The Signal Forming of Discontinuities on Application of the Modulation Eddy Current Flaw Detection,” In Coll. Electromagnetic Methods of Inspection, MDNTP, Moscow, Russia, 1969, pp. 98–101. Blodgett, M. P., C. V. Ukpabi and P. B. Nagy, “Surface Roughness Influence on Eddy Current Electrical Conductivity Measurements,” Materials Evaluation, Vol. 61, No. 6, 2003, pp. 765–772. Devillez, A. and D. Dudzinski, “Tool Vibration Detection with Eddy Current Sensors in Machining Process and Computation of Stability Lobes Using Fuzzy Classifiers,” Mechanical Systems and Signal Processing, Vol. 21, No. 1, 2007, pp. 441–456. Förster F., ‘The Nondestructive Inspection of Tubings for Discontinuities and Wall Thickness Using Electromagnetic Test Methods: Part I,” Materials Evaluation, No. 4, 1970, pp. 21–25. Klyuev, V., “Calculation of Eddy Current Probe for Moving Object Inspection,” Measurements Technique, Moscow, Russia, Vol. 4, 1969, pp. 50–52. Klyuev, V., Devices for NDT Materials and Products, Part 2, Machine Building Publishers, Moscow, Russia, 1976, p. 326. Libby, H., Introduction to Electromagnetic Nondestructive Test Methods, Wiley Interscience, New York, New York, 1971, p.135. Lu, C., “Study on Prediction of Surface Quality in Machining Process,” Journal of Materials Processing Technology, Vol. 205, Nos. 1–3, 2008, pp. 439–450. Rapoport, L. and Y. Bilik, “Application of Eddy Current Method for Estimation of Wear Loss,” Journal of Tribology, Vol. 120, No. 2, 1998, pp. 406–408. Rapoport, L., “Steady Friction State and Contact Models of Asperity Interaction,” Wear, Vol. 267, Nos. 5–8, 2009, pp. 1305–1310. Sandovski, V., “Calculation of Crack Impedance Reflected in the Eddy Current Probe,” Defectoscopia, Vol. 1, 1976, pp. 95–102. Welsh, N. C., “The Dry Wear of Steels: I. The General Pattern of Behavior,” Philosophical Transactions of the Royal Society of London A, 257, 1965, pp. 31–49.
Usage Shares
Total Views
200 Page Views
Total Shares
0 Tweets
0 PDF Downloads
0 Facebook Shares
Total Usage