Experimental research on lunar soil simulant drilling load analysis

The interaction between drill tools and lunar soil played an important role in the field of structure design, performance evaluation, dynamic control, and simulation of lunar autonomous sampler. However, research on the interaction between drill tools and lunar soil is not sufficient to reveal the source of drilling load. Based on the theory of passive earth pressure, it is proposed that the soil mass on the rake face of cutting blade is divided into deposition zone and failure zone according to different soil mass cutting states. Based on the analysis of the contribution from soil mass of deposition zone and failure zone to the total drilling load. a drilling load model for penetrating loosened lunar soil simulant is established. In the end, the drilling load model is verified based on the experimental results of HIT-LS1# lunar soil simulant and HIT-2 drill bit.