Estimation of optimal drilling efficiency and rock ...
2020-10-1u2002·u2002The examination of the drilling mechanism revealed that the drilling energy is dissipated in different drilling stages, as shown in Fig. 1 and Eq., and the following effects were produced by the energy: (1) rock breakage, which is the desired result (Poletto, 2005); (2) other effects due to heat.In addition, the development of radial cracks involves a large proportion of the input energy ...
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