Collisional evolution of asteroids

1999 ◽  
Vol 173 ◽  
pp. 129-144 ◽  
Author(s):  
P. Farinella ◽  
D.R. Davis ◽  
F. Marzari ◽  
D. Vokrouhlický
Keyword(s):  
High Velocity ◽  
Total Mass ◽  
Complex Mixture ◽  
Research Field ◽  
Near Earth Space ◽  
Accretion Process ◽  
High Velocity Impacts ◽  
Near Earth Asteroids ◽  
Asteroid Families ◽  
Collisional Evolution

AbstractWe review the evidence for, and the modelling work devoted to, the substantial collisional evolution which has generated the current asteroid population and continually injects asteroid fragments into dynamicalroutesthrough which they can reach near-Earth space and sometimes hit our planet. The main obstacles to further progress in this research field are theoretical (mainly related to the physics of high-velocity impacts), but better observational data (in particular on the small-size end of the asteroid population) would help. However, in the last decade new insights have been obtained on specific important issues, such as the total mass of the asteroids at the time when the accretion process was stopped (only moderately larger than the current one), the “demography” of asteroid families (how many/how old they are and how they evolve) and the way meteorites and near-Earth asteroids are delivered/transported by a complex mixture of collisional and dynamical mechanisms.

scholarly journals New multi-part collisional model of the main belt: the contribution to near-Earth asteroids

2020 ◽  
Vol 639 ◽  
pp. A9
Author(s):  
P. S. Zain ◽  
G. C. de Elía ◽  
R. P. Di Sisto
Keyword(s):  
Significant Contribution ◽  
Asteroid Belt ◽  
Size Distributions ◽  
Main Belt ◽  
Yarkovsky Effect ◽  
Source Regions ◽  
Main Asteroid Belt ◽  
Near Earth Asteroids ◽  
Asteroid Families ◽  
Collisional Evolution

Aims. We developed a six-part collisional evolution model of the main asteroid belt (MB) and used it to study the contribution of the different regions of the MB to the near-Earth asteroids (NEAs). Methods. We built a statistical code called ACDC that simulates the collisional evolution of the MB split into six regions (namely Inner, Middle, Pristine, Outer, Cybele and High-Inclination belts) according to the positions of the major resonances present there (ν6, 3:1J, 5:2J, 7:3J and 2:1J). We consider the Yarkovsky effect and the mentioned resonances as the main mechanism that removes asteroids from the different regions of the MB and delivers them to the NEA region. We calculated the evolution of the NEAs coming from the different source regions by considering the bodies delivered by the resonances and mean dynamical timescales in the NEA population. Results. Our model is in agreement with the major observational constraints associated with the MB, such as the size distributions of the different regions of the MB and the number of large asteroid families. It is also able to reproduce the observed NEAs with H < 16 and agrees with recent estimations for H < 20, but deviates for smaller sizes. We find that most sources make a significant contribution to the NEAs; however the Inner and Middle belts stand out as the most important source of NEAs followed by the Outer belt. The contributions of the Pristine and Cybele regions are minor. The High-Inclination belt is the source of only a fraction of the actual observed NEAs with high inclination, as there are dynamical processes in that region that enable asteroids to increase and decrease their inclinations.

scholarly journals Numerical Evaluation of a Light-Gas Gun Facility for Impact Test

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
C. Rahner ◽  
H. A. Al-Qureshi ◽  
D. Stainer ◽  
D. Hotza ◽  
M. C. Fredel
Keyword(s):  
High Velocity ◽  
Numerical Evaluation ◽  
Impact Test ◽  
Experimental Tests ◽  
Reservoir Pressure ◽  
One Stage ◽  
Gas Gun ◽  
Numerical Predictions ◽  
High Velocity Impacts ◽  
Different Types

Experimental tests which match the application conditions might be used to properly evaluate materials for specific applications. High velocity impacts can be simulated using light-gas gun facilities, which come in different types and complexities. In this work different setups for a one-stage light-gas gun facility have been numerically analyzed in order to evaluate their suitability for testing materials and composites used as armor protection. A maximal barrel length of 6 m and a maximal reservoir pressure of a standard industrial gas bottle (20 MPa) were chosen as limitations. The numerical predictions show that it is not possible to accelerate the projectile directly to the desired velocity with nitrogen, helium, or hydrogen as propellant gas. When using a sabot corresponding to a higher bore diameter, the necessary velocity is achievable with helium and hydrogen gases.

Design and finite element study of Kevlar based combat helmet for protection against high-velocity impacts

2021 ◽  
Author(s):  
Clifton Stephen ◽  
B. Shivamurthy ◽  
Rajiv Selvam ◽  
Sai Rohit Behara ◽  
Abdel-Hamid I. Mourad ◽  
...  
Keyword(s):  
Finite Element ◽  
High Velocity ◽  
Finite Element Study ◽  
High Velocity Impacts ◽  
Element Study

Dynamics and structural transformations of carbon onion-like structures under high-velocity impacts

Carbon ◽  
2021 ◽  
Author(s):  
M.L. Pereira Júnior ◽  
W.F. da Cunha ◽  
R.T. de Sousa Junior ◽  
G.D. Amvame Nze ◽  
D.S. Galvão ◽  
...  
Keyword(s):  
High Velocity ◽  
Structural Transformations ◽  
Carbon Onion ◽  
High Velocity Impacts

scholarly journals Numerical analysis of high velocity impacts on unidirectional laminates

2014 ◽  
Vol 107 ◽  
pp. 629-634 ◽  
Author(s):  
J. Pernas-Sánchez ◽  
J.A. Artero-Guerrero ◽  
J. Zahr Viñuela ◽  
D. Varas ◽  
J. López-Puente
Keyword(s):  
Numerical Analysis ◽  
High Velocity ◽  
High Velocity Impacts

The structural and dynamical aspects of boron nitride nanotubes under high velocity impacts

2016 ◽  
Vol 18 (22) ◽  
pp. 14776-14781 ◽  
Author(s):  
Leonardo D. Machado ◽  
Sehmus Ozden ◽  
ChandraSekhar Tiwary ◽  
Pedro A. S. Autreto ◽  
Robert Vajtai ◽  
...  
Keyword(s):  
Boron Nitride ◽  
High Velocity ◽  
Boron Nitride Nanotubes ◽  
High Velocity Impacts

This communication report is a study on the structural and dynamical aspects of boron nitride nanotubes (BNNTs) shot at high velocities (∼5 km s−1) against solid targets.

scholarly journals Simulations of high-velocity impacts on metal in preparation for the Psyche mission

Icarus ◽  
2020 ◽  
Vol 338 ◽  
pp. 113505 ◽  
Author(s):  
Clara Maurel ◽  
Patrick Michel ◽  
J. Michael Owen ◽  
Richard P. Binzel ◽  
Megan Bruck-Syal ◽  
...  
Keyword(s):  
High Velocity ◽  
High Velocity Impacts
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