Modelling rock chipping process in linear drag cutting mode
Numerical methods are becoming more attractive for modeling complex rock-tool interaction processes as idealized analytical methods with simplified assumptions do not fully capture the failure process. In this paper, a two-dimensional particle flow code and boundary element code were used to help understand the rock-cutting process in drag cutting mode. In particle flow code, the micro-parameters such as particle/grain size, particle size distribution (to account for rock heterogeneity), contact bond strength and stiffness between the particles/grains were determined by calibrating the model against known properties of Harcourt granite. The numerical simulation results have indicated crushing beneath the tip of the drag cutter, and propagation of distinct cracks further ahead towards the edge of the sample forming a rock chip. It has been observed that for small depth of cut, the rock chipping process is governed by the formation of large number of tensile cracks. However, further experiments are needed in various rock formations to gain clear understanding of fracturing mechanism of rock at different depth of cuts
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