Fatigue Crack Growth of Natural Rubber/Butadiene Rubber Blend Containing Waste Tyre Rubber Powders

Fatigue crack growth in NR/BR compound and the effect of two different types recycled rubber powder (RRP) i.e. micronized cryo-ground 74 ?m ambient-ground 400 were studied using fracture mechanics approach. Absolute relative hysteresis losses single-edge notch tensile (SENT) specimens determined with a displacement-controlled strain compensating for permanent set samples throughout Crack Growth (FCG) experiments. Results indicated correlation between absolute/relative loss fatigue rate under specific dynamic amplitudes. Differences showed that additional energy dissipation, due to multiple new surfaces at tip, contributes FCG RRP compounds. At higher tearing energy, beside other factors affecting performance compounds, both absolute are slightly detrimental rates.