Measuring the mechanical properties of small body regolith layers using a granular penetrometer
作者机构:School of Aerospace EngineeringTsinghua UniversityBeijing 100084China Lunar&Planetary LaboratoryUniversity of ArizonaTucsonAZ 85721USA School of Aeronautic Science and EngineeringBeihang UniversityBeijing 100191China
出 版 物:《Astrodynamics》 (航天动力学(英文))
年 卷 期:2023年第7卷第1期
页 面:15-29页
核心收录:
学科分类:070902[理学-地球化学] 0709[理学-地质学] 07[理学]
基 金:supported by the National Key R&D Program of China(2019YFA0706500)
主 题:small body regolith granular penetrometer small body exploration granular dynamics
摘 要:Small bodies in the solar system are known to be covered by a layer of loose unconsolidated soil composed of grains ranging from dusty sands to rugged *** geophysical processes have modified these regolith layers since their ***,the landforms on regolith-blanketed surfaces hold vital clues for reconstructing the geological processes occurring on small ***,the mechanical strength of small body regolith remains unclear,which is an important parameter for understanding its dynamic ***,regolith mechanical properties are key factors for the design and operation of space missions that interact with small body *** granular penetrometer,which is an instrument that facilitates in situ mechanical characterization of surface/subsurface materials,has attracted significant ***,we still do not fully understand the penetration dynamics related to granular regolith,partially because of the experimental difficulties in measuring grain-scale responses under microgravity,particularly on the longer timescales of small body *** this study,we analyzed the slow intrusion ofa locomotor into granular matter through large-scale numerical simulations based on a soft sphere discrete element *** demonstrated that the resistance force of cohesionlessregolith increases abruptly with penetration depth after contact and then transitions to a linear *** scale factor of the steady-state component is roughly proportionalto the internal friction of the granular materials,which allows us to deduce the shearstrength of planetary soils by measuring their force depth *** cohesion is included,due to the brittle behavior of cohesive materials,the resistance profile is characterized by a stationary state at a large penetration *** saturation resistance,which represents the failure threshold of granular materials,increases with the cohesion strength of the *** positive correlation pr