Development of a heating system and the effect of temperature in the twin-disc test
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING(2023)
摘要
Although temperature is an important variable in tribosystems, its monitoring and control are constantly neglected by studies that use the twin-disc test to simulate the interactions that occur at the wheel-rail interface. In this study, a heating system was developed that allows the performance of tests with temperature control. For validation, tests were performed from room temperature to 80 °C. These tests demonstrated the operation of the heating system and the effect of temperature in the twin-disc test. Under the test conditions at a temperature of 70 °C, the mass loss was 36% lower than that of the test at room temperature. In discs A (wheel), the formation of black oxides with lubricating characteristics was observed and consequent reduction in wear for tests at higher temperature. On the other hand, in discs B (rail), the condition of lower mass loss coincides with a less degraded surface and with fewer and smaller cracks. The post-test roughness of the disc B (rail) was independent of the temperature; however, the roughness of the disc A (wheel) suffered a slight rise with an increase in temperature. The roughness of the discs B was also lower than that of the discs A.
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关键词
Twin-disc test, Temperature, Heating system, Wheel-rail contact
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