Coring Bit with Enhanced Structural Parameters for Improved Lunar Soil Sampling and Reduced Mechanical Disturbance

摘要

A new coring bit with a barrier ring was developed to address the disturbance problem associated with the common method of lunar soil sampling. This new coring bit is presented in this paper along with an analysis of the physical characteristics of regolith and coring bits. The structural parameters of the barrier ring, which disturbs the original state of the soil, are also analyzed. A user-defined material, based on the user-defined material mechanical behavior (UMAT) subroutine in the ABAQUS finite-element software, was used to simulate the contact area between the lunar soil and the barrier. The simulation results showed that the structure of the barrier ring has a significant effect on the stress and displacement produced in the lunar soil below the coring bit, but has little effect on the soil inside the ring. The test results showed that the coring bit with the barrier ring achieves a higher coring rate and causes less disturbance than a common bit.