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F. Stadlbauer, T. Koch, V. Archodoulaki:
"Approach to Measure the Influence of Experimental Parameters on Fatigue Crack Growth and Heat Build-Up in Rubber";
Talk: 5th International Conference on Structural Analysis of Advanced Materials, Kos, Griechenland; 2013-09-23 - 2013-09-26; in: "ICSAAM 2013, Conference Proceedings", (2013), 15 pages.

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. Primary, fatigue behaviour for three different frequencies (1 Hz, 3 Hz and 5 Hz) is studied. Special focus lies on heat build-up which is substantial, especially for large loads, high frequencies and/or highly filled rubber blends. Amplitude ratio appears to be another important influence factor. 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 waveform is determined for three different waveform shapes. One is sinusoidal and two have square shape including dwell periods and sinusoidal slopes. Besides, 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 heat build-up is very small due to different sample geometry.

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