Seminarium ZTI

Extreme Flash Temperatures due to Rough Surfaces?

Dipl.-Ing. Martin Ertz, Technische Universität Berlin

pi±tek, 11 pa¼dziernika 2002, godz. 10:00, sala S-4

Even in the case of smooth surfaces, sliding friction between railway wheels and rails results in considerable contact temperatures that are proportional to the contact pressure. Using measured profiles of rough surfaces, one gets much higher maximum surface stresses than in the smooth case. It is sometimes assumed that contact temperatures for rough surfaces increase with the same ratio as maximum pressure does. This problem will be investigated in detail by means of a simple model. It can be shown that maximum temperatures for rough surfaces are not much higher than in the smooth case.