A novel test rig for in situ and real time optical measurement of the contact area evolution during pre-sliding of a spherical contact |
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Authors: | A Ovcharenko G Halperin I Etsion M Varenberg |
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Affiliation: | (1) Mechanical Engineering Department, Technion, Haifa , 32000, Israel;(2) Max Planck Institute for Metals Research, Heisenbergstr. 3, Stuttgart , 70569, Germany |
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Abstract: | An experimental test rig was developed in order to investigate elastic–plastic single micro-spherical contact under combined
normal and tangential loading. This novel apparatus allows in situ and real time direct optical measurement of the real contact area (RCA) evolution in pre-sliding. It also allows relative
displacement measurements under very low rates of tangential loading (down to 0.01 N/s) to capture accurately the fine details
at sliding inception. This is achieved by piezoelectric actuation in closed loop feedback control in addition to synchronization
with data and image acquisition to obtain real time measurement. The RCA measurement is realized by direct optical observation
technique, whereas two different image processing algorithms were implemented for the elastic and the elastic–plastic contact
regimes. The various features and capabilities of the test rig are presented along with some preliminary experimental results
of RCA and friction behavior to assess its performance. |
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Keywords: | spherical contact elastic– plastic contact real contact area in situ real time measurement image processing |
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