Thermal measurement of brake pad lining surfaces during the braking process

Tadeusz Piątkowski; Henryk Polakowski; Mariusz Kastek; Pawel Baranowski; Krzysztof Damaziak; Jerzy Małachowski; Łukasz Mazurkiewicz

doi:10.1117/12.918391

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18 May 2012 Thermal measurement of brake pad lining surfaces during the braking process

Tadeusz Piątkowski, Henryk Polakowski, Mariusz Kastek, Pawel Baranowski, Krzysztof Damaziak, Jerzy Małachowski, Łukasz Mazurkiewicz

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Proceedings Volume 8354, Thermosense: Thermal Infrared Applications XXXIV; 83540E (2012) https://doi.org/10.1117/12.918391
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

This paper presents the test campaign concept and definition and the analysis of the recorded measurements. One of the most important systems in cars and trucks are brakes. The braking temperature on a lining surface can rise above 500°C. This shows how linings requirements are so strict and, what is more, continuously rising. Besides experimental tests, very supportive method for investigating processes which occur on the brake pad linings are numerical analyses. Experimental tests were conducted on the test machine called IL-68. The main component of IL-68 is so called frictional unit, which consists of: rotational head, which convey a shaft torque and where counter samples are placed and translational head, where samples of coatings are placed and pressed against counter samples. Due to the high rotational speeds and thus the rapid changes in temperature field, the infrared camera was used for testing. The paper presents results of analysis registered thermograms during the tests with different conditions. Furthermore, based on this testing machine, the numerical model was developed. In order to avoid resource demanding analyses only the frictional unit (described above) was taken into consideration. Firstly the geometrical model was performed thanks to CAD techniques, which in the next stage was a base for developing the finite element model. Material properties and boundary conditions exactly correspond to experimental tests. Computations were performed using a dynamic LS-Dyna code where heat generation was estimated assuming full (100%) conversion of mechanical work done by friction forces. Paper presents the results of dynamic thermomechanical analysis too and these results were compared with laboratory tests.

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Tadeusz Piątkowski, Henryk Polakowski, Mariusz Kastek, Pawel Baranowski, Krzysztof Damaziak, Jerzy Małachowski, and Łukasz Mazurkiewicz "Thermal measurement of brake pad lining surfaces during the braking process", Proc. SPIE 8354, Thermosense: Thermal Infrared Applications XXXIV, 83540E (18 May 2012); https://doi.org/10.1117/12.918391

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