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Lagrangian-based simulations of hypervelocity impact experiments on Mars regolith proxy

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2020GL087393· OSTI ID:1716798
 [1];  [2];  [2];  [2];  [2];  [3];  [4];  [5];  [5]
  1. École Normale Supérieure Paris‐Saclay, Cachan (France); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. California Institute of Technology (CalTech), Pasadena, CA (United States)
  4. Planetary Science Inst., Tucson, AZ (United States)
  5. Univ. de Paris (France)
+ Show Author Affiliations
Most of the surface of Mars is covered with unconsolidated rocky material, known as regolith. High–fidelity models of the dynamics of impacts in such material are needed to help with the interpretation of seismic signals that are now recorded by SEIS, the seismometer of InSight. We developed a numerical model for impacts on regolith, using the novel Hybrid Optimization Software Suite (HOSS), which is a Lagrangian code mixing finite and discrete element formulations. We use data from hypervelocity impact experiments performed on pumice sand at the NASA Ames Vertical Gun Range to identify and calibrate key model parameters. Here, the model provides insight into the plastic–elastic transition observed in the data and it also demonstrates that gravity plays a key role in the material response. Waveforms for receivers situated vertically below the impact point are correctly modeled, while more research is needed to explain the shallow receivers' signals.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
Agence Nationale de la Recherche (ANR); LDRD
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1716798
Alternate ID(s):
OSTI ID: 1643892
Report Number(s):
LA-UR--19-32642
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 13 Vol. 47; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

58 GEOSCIENCES
Equation of State
Granular media
Hypervelocity impacts
Impacts
Langrangian numerical model
Mars
Mars regolith
Parametric study
Planetary Sciences
Seismology
Shock wave