Influence of Experimental Parameters on Fatigue Crack Growth and Heat Build-Up in Rubber

Materials

Franziska Stadlbauer²  Thomas Koch²  Vasiliki-Maria Archodoulaki²  Florian Planitzer¹  Wolfgang Fidi¹ 

[1] Semperit Technische Produkte Gesellschaft m.b.H., Triester Bundesstraße 26, Wimpassing 2632, Austria; E-Mails:;Institute of Materials Science and Technology, Vienna University of Technology, Favoritenstraße 9-11, Vienna 1040, Austria; E-Mails:

关键词: fatigue;    crack growth;    rubber;    sample geometry;    influence factor;    frequency;    amplitude ratio;    loading waveform;    heat build-up;   

DOI  :  10.3390/ma6125502

来源: mdpi

【 摘 要 】

Loading parameters (frequency, amplitude ratio and waveform) are varied to determine their influence on fatigue crack growth in rubber. Up to three different rubber blends are investigated: one actual engineering material and two model materials. Fatigue crack growth curves and strain distributions of pure shear and faint waist pure shear samples are compared for a model material. Fatigue behavior is studied for three different frequencies (1 Hz, 3 Hz and 5 Hz). Amplitude ratio appears to be another important influence factor concerning fatigue crack growth in rubber. The beneficial effect of positive amplitude ratios (tensional loading conditions) is shown for different materials. However, fatigue crack growth is considerably increased for negative amplitude ratios (tensional-compressional loading conditions). Furthermore, the influence of the waveform is determined for three different waveform shapes. One is sinusoidal, and two have a square shape, including dwell periods and sinusoidal slopes. Special focus lies on heat build-up, which is substantial, especially for large loads, high frequencies and/or highly filled rubber blends. Plateau temperatures are determined for various loading conditions and rubber blends. A very simple linear relationship with dissipated energy per time and unit area is obtained. Results gathered with dynamic mechanical analyses show, likewise, a linear trend, but the heat build-up is very small, due to different sample geometries.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.