| The recycle of waste radial tyre has been an attention-getting subject in recent years, it has a direct influence on environmental protection, resource reuse and the sustainable development of economic. The powder of waste tyre rubber has been an important means to process the waste radial tyre and reclaim rubber resource, the rubber powder can be directly used or be desulfurized for further applications. The usability of rubber powder is influenced by its grain size, and the rubber material can be desulfurized directly in the powder-process if its grain size is small enough. In this paper, ultra-high pressure water jet was applied to recycle the waste radial tyre, the ground tread rubber (GTR) was powdered into partials using ultra-high pressure water jet to reclaim the rubber resource from waste tyre. This paper focused on the mechanism of the ultra-high pressure water jet technology for recycling waste radial tyre.By means of scanning electron microscopy (SEM), the macro and micro structure of waste radial tyre rubber failure surfaces before and after the high pressure water jet were observed, the microstructure of tyre rubber micro-crack surfaces before broken and rubber failure surfaces were obtained; the strain distribution of tyre rubber with surface cracks under the impact of ultra-high pressure water jet was simulated, the dynamic fracture behavior of tyre rubber with surface crack was analyzed. The failure surfaces of tyre rubber under the impact of different processing parameters were analyzed, the change laws of rubber failure surfaces were obtained. The particle size distribution of the rubber powder reclaimed by water jet was obtained through particle size analysis, the particle size variation under different process parameters were obtained.The theoretical analysis and experimental results show that, under the impact of ultra-high pressure water jet, the crack propagation was occurred on the initial micro-crack of waste tyre rubber surface, the tyre rubber was broken under the action of crack propagation and shear. Through the research of tyre rubber failure surfaces changes under different water jet process parameters, the main microscopic failure modes were intergranular damage caused by the crack propagation and transgranular fracture due to shear, and accompanied by cavitation phenomenon. Through the study of particle size variation of rubber powder under different water jet processing parameters, the driving pressure was the main factor affecting rubber performance. |
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