Perspective of Dynamic Interaction between Rock and Cutting Tool

Rock cutting involves a dynamic process where the rock experiences dynamics loading induced by cutting tools. In this presentation, the mechanical cutting problem from rock dynamic point of view was investigated. First of all, it was shown that the loading rate of mechanical cutting falls in the intermediate strain rate (ISR) which is higher than the quasi-static rate and lower than the high strain rate (HSR). Then, it was examined if dynamic rock properties at ISR need to be used in the numerical simulation for the performance prediction. Accordingly, a series of test were carried out to obtain dynamic mechanical properties by using non-explosive powder reaction loading device that was able to generate loading in the ISR range. The properties were input in the numerical simulation for a linear cutting test. Finally, the cutter forces and specific energy from the numerical simulation were validated against laboratory linear cutting test. It is found that numerical simulation using dynamic input parameters match better with the laboratory experiment.