Imperial College London
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Professor Gareth Collins

Faculty of Engineering, Department of Earth Science & Engineering

Professor of Planetary Science
 
 
 
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Contact

 

+44 (0)20 7594 1518g.collins Website

 
 
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Location

 

4.83Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Luther:2022:PSJ/ac8b89,
author = {Luther, R and Raducan, S and Burger, C and Wuennemann, K and Jutzi, M and Schaeffer, C and Koschny, D and Davison, T and Collins, G and Zhang, Y and Michel, P},
doi = {PSJ/ac8b89},
journal = {The Planetary Science Journal},
pages = {1--14},
title = {Momentum enhancement during kinetic impacts in the low-intermediate-strength regime: benchmarking & validation of impact shock physics codes},
url = {http://dx.doi.org/10.3847/PSJ/ac8b89},
volume = {3},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - In September 2022, the DART spacecraft (NASA’s contribution to the Asteroid Impact & Deflection Assessment collaboration, AIDA) will impact the asteroid Dimorphos, the secondary in the Didymos system. The crater formation and material ejection will affect the orbital period. In 2027, Hera (ESA’s contribution to AIDA) will investigate the system, observe the crater caused by DART, and characterise Dimorphos. Before Hera’s arrival, the target properties are not well constrained. The relationships between observed orbital change and specific target properties are not unique, but Hera’s observations will add additional constraints for the analysis of the impact event, which will narrow the range of feasible target properties. In this study, we use three different shock physics codes to simulate momentum transfer from impactor to target and investigate the agreement between the results from the codes for well defined target materials. In contrast to previous studies, care is taken to use consistent crushing behaviour (e.g., distension as a function of pressure) for a given porosity for all codes. First, we validate the codes against impact experiments into a regolith simulant. Second, webenchmark the codes at the DART impact scale for a range of target material parameters (10-50% porosity, 1.4 - 100 kPa cohesion). Aligning the crushing behaviour improves theconsistency of the derived momentum enhancement between the three codes to within +/- 5%for most materials used. Based on the derived mass-velocity distributions from all three codes, we derive scaling parameters that can be used for studies of the ejecta curtain.
AU  - Luther,R
AU  - Raducan,S
AU  - Burger,C
AU  - Wuennemann,K
AU  - Jutzi,M
AU  - Schaeffer,C
AU  - Koschny,D
AU  - Davison,T
AU  - Collins,G
AU  - Zhang,Y
AU  - Michel,P
DO  - PSJ/ac8b89
EP  - 14
PY  - 2022///
SN  - 2632-3338
SP  - 1
TI  - Momentum enhancement during kinetic impacts in the low-intermediate-strength regime: benchmarking & validation of impact shock physics codes
T2  - The Planetary Science Journal
UR  - http://dx.doi.org/10.3847/PSJ/ac8b89
UR  - https://iopscience.iop.org/article/10.3847/PSJ/ac8b89
UR  - http://hdl.handle.net/10044/1/99321
VL  - 3
ER  -
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