Measuring the mechanical properties of small body regolith layers using a granular penetrometer

Cheng, Bin Kang; Asphaug, Erik; Yu, Yang; Baoyin, Hexi

doi:10.1007/s42064-021-0127-8

Cited by 12 publications

(1 citation statement)

References 56 publications

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“…The rubble pile structure indicates that the asteroid can be treated as a bound granular system, which can be numerically studied using the DEM simulation (Cheng et al 2023). Another approach is to assume the rubble pile is made up of ideal continuous geomaterial that is elastic-perfectly plastic (Holsapple 2008).…”

Section: Failure Of the Regolith Layermentioning

confidence: 99%

Regolith resurfacing and shedding on spinning spheroidal asteroids: Dependence on the surface mechanical properties

Dai,

Yu,

Cheng

et al. 2024

A&A

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The Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect has been shown to effectively alter the rotational status of asteroids. The spin-up of the asteroid leads to surface instability and eventually triggers regolith failure, followed by landslide and mass shedding on the asteroid's surface. We explore the dynamics of the rotation-induced resurfacing and shedding, paying special attention to the dependence of post-shedding evolution on regolith mechanical properties, such as cohesion. We propose a qualitative semi-analytical model to explore the post-failure dynamics of a fast-rotating asteroid. We also consider the interaction between the surface mass rearrangement and the asteroid’s spin status. We used our model to investigate the surface region where the failure occurs, as well as the total mass shed from the surface and the spin-down of the asteroid in this process. Based on our model, all the possible avalanche events following a regolith failure can be classified into four basic types: resurfacing (ReS), shedding and resurfacing (S ReS), shed and bound (S-Bound), and shedding and escaping (S-Escp). Their corresponding regions in the parameter space are illustrated in this work. Our results show that although the regolith cohesion is very small ($ 1-2$Pa), cohesion plays an important role in the onset of the avalanche. Moreover, our model qualitatively reconstructs the links between the regolith’s properties and the dynamical fates of the shed material. The timescale of YORP-induced shedding events is also discussed in this work.

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Section: Failure Of the Regolith Layermentioning

confidence: 99%

Regolith resurfacing and shedding on spinning spheroidal asteroids: Dependence on the surface mechanical properties

Dai,

Yu,

Cheng

et al. 2024

A&A

Self Cite

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Resistive force modeling for shallow cone penetration into dry and wet granular layers

Iikawa,

Katsuragi

2024

Acta Geotech.

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Estimating penetration resistive forces on granular materials is important for applications in various research fields. This paper investigates resistive forces into dry and wet granular layers through theoretical analysis and discrete element simulations. Theoretical model is derived from slip line field theory by assuming materials with cohesion and inter-particle friction. This model indicates that penetration resistive forces are composed of the sum of the buoyancy-like force proportional to the penetration volume and the cohesion-derived force proportional to the penetration cross-sectional area. The model is compared with the simulation results of various cones shallowly penetrating into granular layers with/without liquid-bridge forces between particles. For cohesion-derived force, the simulated resistive forces agree with the theoretical model within a factor of two. For buoyancy-like force, on the other hand, the simulated resistive forces deviate from the theoretical model by up to five times as the cone-tip angle increased. To solve the discrepancy, this paper introduces the correction factor depending on the relationship between stagnant zone and cone shape. As a result, a maximum difference between the proposed model and simulated force are reduced to twice. Thereby, it turns out that the proposed model can compute penetration resistive forces on granular layers in a wide range of cone-tip angles and water content conditions.

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Slow intrusion experiments into granular media under microgravity

Guo,

Zhang,

et al. 2024

Advances in Space Research

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Measuring the mechanical properties of small body regolith layers using a granular penetrometer

Cited by 12 publications

References 56 publications

Regolith resurfacing and shedding on spinning spheroidal asteroids: Dependence on the surface mechanical properties

Regolith resurfacing and shedding on spinning spheroidal asteroids: Dependence on the surface mechanical properties

Resistive force modeling for shallow cone penetration into dry and wet granular layers

Slow intrusion experiments into granular media under microgravity

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