Abstract
In order to further study rock fracture mechanism cutting by conical picks, a number of indentation experiments were undertaken. In these experiments, the chips formation and their shapes were initially observed. Then, a model of specific energy was developed and the effects of relevant cutting parameters on the specific energy were investigated based on Evans’ rock cutting mode and indentation experiments. The results showed that fracture toughness, elasticity modulus of the rock, and depth of cut have significant influence on specific energy. Applications of fracture mechanics to cutting indicated that the maximum indentation depth linearly increases with the increasing of depth of cut. There is positive power correlation between maximum cutting force and depth of cut. The total work done by the pick is approximately proportional to the square of cutting depth. The dataset of specific energy yields on a power fitting curve with the depth of cut. Theoretical analysis and experimental results revealed that there is only approximately 3% of the external work of the pick contributes to the generation of new chipping surfaces while most the external energy is dissipated in producing the crushing zone.
Published Version
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