[Back]

S. Seichter, V. Archodoulaki, T. Koch, W. Fidi, A. Holzner, S. Robin:
"Einfluss der Temperatur auf die Ermüdung von Elastomeren";
Talk: Tagung Werkstoffprüfung 2015, Bad Neuenahr, Deutschland; 2015-12-02 - 2015-12-04; in: "Fortschritte in der Werkstoffprüfung für Forschung und Praxis", M. Borsutzki, G. Moninger (ed.); Verlag Stahleisen, Düsseldorf (2015), ISBN: 978-3-514-00816-8; 61 - 66.

Long-term durability of rubber used under cyclic loading is a critical issue. Besides mechanical fatigue which is the primary consideration, thermal load also contributes to fatigue life. This is of importance since rubber shows a distinctive heat build-up. The consequence is a higher temperature of the samples which decreases ultimate properties, dynamic properties and also has chemical effects on the crosslink system. Furthermore, the ambient temperature has an influence on the properties.
Although many different models already exist to predict the mechanical fatigue life, the optimal model which also includes the influence of the temperature is still subject of research. Often the effect of self-heating is diminished.
In the present work application-relevant rubber compounds are investigated containing SBR, NR and BR and different types of carbon black. To investigate the fatigue properties, two testing machines are used. An electrodynamic machine is used to measure the fatigue life of rubber compounds. A hydraulic testing machine is used to measure fatigue life and to determine the crack growth behaviour under different temperatures.
Crack growth and fatigue life measurements are carried out at ambient temperatures and the temperature of the sample surface is measured with a thermal imaging system. The measurements are repeated under different higher temperatures and the influence of the increasing temperature can be shown.

rubber, fatigue life, crack growth, temperature