In-situ measurements of surface temperature fields on ring-block contact surface under friction using infrared thermography

Abstract

Measurement of Surface temperature in friction has became attracted extensive attention in modern industry, especially in manufacture. When the temperature in friction exceed a given value, the wear of parts will be accelerated. Some of the failed parts exhibited enormous thermal damage. Infrared thermography(ITG), sometimes called infrared(IR) imaging system, provides a quantification of the degradation in thermal performance as the machine are working and can be used to identify degrading parts for replacement before failures become immanent. A novel test technique is described in which surface temperatures were measured during tests of a rotating ring and a flat block which had a thermocouples embedded under its contact surface. The technique involves measurement of the radiation emitted by a side of the specimen immediately adjoining the ring-block contact region using a Charge Coupled Device (CCD) based ITG. By using an appropriate calibration procedure, measured radiation values are converted to temperatures. Novel aspects of the experimental technique are non-intrusive and full-field dynamic measurement at high spatial resolution and high sensitivity. This technique should facilitate study of thermal damage and multi-scale of thermal models in friction.