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Ashdod, Israel

Bilik Y.,Vortek Ltd. | Bilik D.,Vortek Ltd. | Moshkovich A.,Holon Institute of Technology | Perfilyev V.,Holon Institute of Technology | Rapoport L.,Holon Institute of Technology
Materials Evaluation

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. Source

Bilik Y.,Vortek Ltd. | Rapoport L.,Holon Institute of Technology | Bilik D.,Vortek Ltd. | Perfiliev V.,Holon Institute of Technology | Moshkovich A.,Holon Institute of Technology
Materials Evaluation

The objective of this work was to study in situ a variation of roughness parameters of steel surfaces in dynamic conditions (moving parts with the velocity up to 0.4 m/s) of dry and lubricant friction. These experiments were performed during friction tests using a pin-on-disk rig. A highly productive eddy current technique for measurement of the roughness parameters in dynamic conditions of dry and lubricant friction was developed. The maximal error in the eddy current measurements compared to the standard roughness measurements was not greater than 20%. It was experimentally shown that at dry friction owing to plastic deformation, sensitivity of the eddy current device to roughness increased approximately 4.23 × in comparison to friction in oil. The results obtained in this study can be useful both in the measurement of roughness during friction and in the machining of surfaces by grinding or polishing with or without fluids. Source

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