Motion of soil-working tool under impact loading

The cyclic process of penetration of soil by a tool under periodic impact loading was described mathematically. The analysis was based on a piecewise-linear approximation of the dependence of the soil frontal resistance force on tool displacement—an approximation reflecting modern views on the principles of soil-tool interaction.Different intervals in the cycle of steady-state motion of the tool, and different interaction regimes were considered. The mean tool velocity for borehole forming was determined. Conditions for a minimum energy requirement in the cyclic process were formulated, and the influence of frequency on the laws governing the interaction was established.