Asteroid regolith strength: Role of grain size and surface properties

Brisset, Julie; Sánchez, Paul; Cox, Christopher; Corraliza, Dennis; Hatchitt, John; Madison, Alexander; Miletich, Thomas

doi:10.1016/j.pss.2022.105533

Cited by 12 publications

(2 citation statements)

References 49 publications

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“…where J 2 and I 1 are functions of the principal stresses. The upper bound, ω (+) , and lower bound, ω (−) , depend on the material mechanical properties: Poisson's ratio, ν, the internal friction angle, ϕ, and the macroscopic cohesive strength, C. The internal friction angle is typically in the range from ∼25 • to ∼45 • , and the DEM simulations suggest a Poisson's ratio of ∼0.2 for such granular media (Brisset et al 2022). This work focuses primarily on the dependence of the failure and the subsequent evolution to the regolith cohesion C. In the following, the Poisson's ratio is fixed at 0.25, and the friction angle values of 30 • , 40 • , and 50 • are examined.…”

Section: Estimation Of the Critical Spin Ratementioning

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: Estimation Of the Critical Spin Ratementioning

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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“…M et al, 2021). The increasing of angle between 25 and 45 as the strength increase between 600 and 900 Pa, and bulk cohesion values between ~ 400 and 600 Pa (Brisset. J et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

The numerical model of the Internal friction angle and Saturation Degree affect the vertical displacement of the ground

Doan¹

2022

Preprint

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The numerical model of the different vertical displacement and the internal friction angle variations were determined carefully by the Viet Nam Standard. The difference between experimental values and simulation of the PLAXIS 3D software, was shown remarkably as the maximum value was shown in 0.01975 m (z = -36.9m) depth with ϕ0 = 290); whereas the minimum value in 0.002844 m (z = 0m) depth with ϕ0 = 20. The mean value at the center of the Clay layer (from 0.0m to 27.0m) depth was obtained at 0.0577m whereas compared with 0.0156 m at the Sand layer (from 27.0 to 39.6m) depths. Moreover, water content (W%) and porosity (P%) were calculated particularly at the maximum value of 94.35% (borehole “HK 2”) with 4.8m depth, whereas the minimum value is 18.22% at 39.3m depth (borehole “HK3”); which compared with porosity (P%) of 71.9% (borehole “HK2”) at 4.8m depth, and 40.4% (borehole “HK3”) at 4.8m depth. On the other hand, Saturation results presented a relatively low mean value of 88.09% and 86.79% at the center of the ground (from 4.3m to 15.3m). The increase of 23% and 75.42% (from 18.3m to 39.3m) as compared with the research of Zapatata, 1999.

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The effect of particle size distribution on lunar regolith simulant angle of repose

Easter,

Long-Fox,

Britt

et al. 2024

Advances in Space Research

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Asteroid regolith strength: Role of grain size and surface properties

Cited by 12 publications

References 49 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

The numerical model of the Internal friction angle and Saturation Degree affect the vertical displacement of the ground

The effect of particle size distribution on lunar regolith simulant angle of repose

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