Vol.10, No 2, 2012 pp. 171 - 180
UDC 536.2;   622.34;   629.4.01;   629.4.02;   678.4
HEAT GENERATION PREDICTION IN THE RAILWAY DRAW GEAR RUBBER-METAL SPRING
Milan Banić, Vojislav Miltenović, Miloš Milošević, Aleksandar Miltenović, Nataša Jovanović
University of Niš, Faculty of Mechanical Engineering, Niš, Serbia
E-mail: banic@masfak.ni.ac.rs
The temperature of rubber or rubber-metal springs is liable to increase under cyclic loading, due to hysteresis losses and low rubber thermal conductivity. This well-known phenomenon, called a heat build-up, is the primary reason for rubber aging. A temperature increase within the rubber compound leads to degradation of its physical and chemical properties, its stiffness increase and its damping capability loss. An extensive heat build-up can be a major concern during the accelerated fatigue testing of rubber-metal springs as it alters the spring properties during the testing procedure and can cause permanent damage leading to the testing results unreliability. The paper presents a case study of the heat generation prediction in the rubber-metal spring of railway draw gear during dynamic testing in accordance with UIC Code 827-1.
Key words: Draw Gear, Rubber-metal Spring, Hysteresis Heat Generation, Finite Elements Analysis
PREDVIĐANJE GENERISANJA TOPLOTE U GUMENO METALNOJ OPRUZI VUČNE OPREME ŽELEZNIČKIH VOZILA
Temperatura gumenih ili gumeno metalnih opruga se povećava pri cikličnom opterećenju zbog histerezisnih gubitaka energije i niske toplotne konduktivnosti gume. Ovaj dobro poznati fenomen zagrevanja gume pri cikličnom opterećenju je osnovni uzrok njenog starenja. Povećanje temperature gumene smeše dovodi do pogoršanja njenih fizičkih i hemijskih svojstava, povećanja krutosti i gubitka prigušne sposobnosti. Pregrevanje gumene smeše može predstavljati veliki problem pri ubrzanom ispitivanju zamora gumeno metalnih opruga jer se menjaju karakteristike opruge tokom ispitivanja, a može izazvati i trajno oštećenje opruge čime rezultati ispitivanja postaju nepouzdani. U radu je prikazana procedura predviđanja generisanja toplote u gumeno metalnoj opruzi vučne opreme železničkog vozila prilikom dinamičkog ispitivanja prema UIC Objavi 827-1.
Ključne reči: vučna oprema, gumeno metalna opruga, generisanje toplote usled histerezisnih gubitaka, analiza metodom konačnih elemenata