Development of High-Speed Infrared Thermographic Microscope for Dynamic Visualization of Tribological Phenomena

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The present project developed a high-speed infrared thermographic microscope for dynamic visualization of the tribological phenomena. Several experimental investigations of contact problems were carried out through the use of the developed high-speed infrared thermographic microscope. The results obtained are summarized as follows.1. An infrared thermographic microscope system was developed based on the high-speed infrared camera for evaluating temperature and stress distribution of the contact surface and its surrounding area2. A new technique using infrared thermographic microscope combined with infrared-transmitting materials was proposed for the direct measurement of the surface temperature of two contacting solids. This technique was applied to contact stress measurement, through the accurate detection of small cyclic temperature fields induced by the coupled-thermoelastic effect. Contact stress measurements were made for both flat-on-flat and the Hertzian contact. Excellent images of the contact stress distribution were obtained by the infrared thermography based stress analyzing system, indicating that the present technique was applicable to the visualization and quantitative analysis of the contact stresses.3. The high-speed infrared thermographic microscope was employed to characterize the near-surface conditions associated with fretting contact. Both frictional temperature rise due to interfacial slip and the temperature fluctuation due to thermoelasticity can be measured by this system. The experimental results provide insight into not only the magnitude and distribution of near-surface temperatures, but also the nature of the contact stress field and the mechanics of partial slip fretting contacts.