Abstract
Experimental results for the penetration of conical bits into rocks have been obtained and compared to theoretical results derived from an existing bit penetration model which is similar to the one established by Dutta. The tests were made in sandstone, andesite and granite using seven indenters with apex angles in the range 60-150°. Moreover, the effect of mechanical anisotropy on bit penetration behaviour was examined using sandstone. For the smaller apex angles chipping was predominant whereas for the larger apex angles essentially only crushing occured.Crater volume and force-penetration curves were measured, and the theoretical cutting efficiency and the ratio of volume to work were evaluated. Using those values of the mentione parameters, quantitative consistency between theory and experiment is obtained. Accordingly, the penetration model has the capability of predicting quantitatively the rock cutting and drilling behaviour.
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