TY - JOUR
TI - Equivalent verification method for extreme hypothermic environment adaptability of lunar polar drill bit cutting tools
AU - Mo Gui-Dong
AU - Wang Lu-Si
AU - Li Jun
AU - Gong Jun-Shan
AU - Pang Yong
AU - Xu Yang
AU - Ling A-Bin
AU - Li Xin-Xin
AU - Sun Qi-Chen
JN - Thermal Science
PY - 2025
VL - 29
IS - 2
SP - 1223
EP - 1230
PT - Article
AB - Aiming at the problems of high cost and great difficulty in verifying the  performance of the drill bit cutting tools in the extreme hypothermic  environment (20-40 K) of the lunar polar regions, this paper proposes an  equivalent verification method based on the liquid nitrogen temperature  range (-180°C). Through a systematic analysis of the influence mechanism  of extremely low temperature on the mechanical properties of lunar regolith  and the performance of drill bit materials, the stable threshold of the  strength of the frozen soil working condition changing with temperature is  determined, and the key risk of the increase in internal stress caused by  the thermo-mechanical coupling deformation of the drill bit is revealed.  Based on the equivalent principle of material impact work and the  compensation strategy for thermal stress increment, an equivalent  verification theoretical framework with the core of kinetic energy  proportional scaling and external load superposition is constructed, and a  multi-dimensional test matrix covering the working conditions of dry soil  and frozen soil is designed. The research results show that, by optimizing  the driving parameters of the drilling tool and the load conditions, this  method can effectively simulate the mechanical impact and structural stress  effects of the extreme hypothermic environment on the cutting tools,  providing an innovative solution for the low cost and high efficiency  verification of the reliability of drilling tools.