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Description of fatigue damage in carbon black filled natural rubber

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The present paper deals with fatigue damage at the macroscopic scale in carbon black filled natural rubber under uniaxial loading conditions. Uniaxial tension-compression, fully relaxing uniaxial tension and non-relaxing uniaxial tension loading conditions were applied until samples failure. Results, summarized in a Haigh diagram, show that only one type of fatigue damage is observed for uniaxial tension-compression and fully relaxing uniaxial tension loading conditions, and that several different types of fatigue damage take place in non-relaxing uniaxial tension loading conditions. The different damage types observed under non-relaxing uniaxial tension loading conditions are closely related to the improvement of rubber fatigue life. Therefore, as fatigue life improvement is classically supposed to be due to stress-induced crystallization, a similar conclusion can be drawn for the occurrence of different types of fatigue damage.

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Jean-Benoît LE CAM

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