SPH calculations of asteroid disruptions: The role of pressure dependent failure models

Jutzi, Martin (2015). SPH calculations of asteroid disruptions: The role of pressure dependent failure models. Planetary and space science, 107, pp. 3-9. Elsevier 10.1016/j.pss.2014.09.012

[img] Text
1-s2.0-S0032063314002931-main.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (1MB) | Request a copy
[img]
Preview
Text
1502.01860.pdf - Accepted Version
Available under License Creative Commons: Attribution-Noncommercial-No Derivative Works (CC-BY-NC-ND).

Download (693kB) | Preview

We present recent improvements of the modeling of the disruption of strength dominated bodies using the Smooth Particle Hydrodynamics (SPH) technique. The improvements include an updated strength model and a friction model, which are successfully tested by a comparison with laboratory experiments. In the modeling of catastrophic disruptions of asteroids, a comparison between old and new strength models shows no significant deviation in the case of targets which are initially non-porous, fully intact and have a homogeneous structure (such as the targets used in the study by Benz and Asphaug, 1999). However, for many cases (e.g. initially partly or fully damaged targets and rubble-pile structures) we find that it is crucial that friction is taken into account and the material has a pressure dependent shear strength. Our investigations of the catastrophic disruption threshold (27, as a function of target properties and target sizes up to a few 100 km show that a fully damaged target modeled without friction has a Q(D)*:, which is significantly (5-10 times) smaller than in the case where friction is included. When the effect of the energy dissipation due to compaction (pore crushing) is taken into account as well, the targets become even stronger (Q(D)*; is increased by a factor of 2-3). On the other hand, cohesion is found to have an negligible effect at large scales and is only important at scales less than or similar to 1 km. Our results show the relative effects of strength, friction and porosity on the outcome of collisions among small (less than or similar to 1000 km) bodies. These results will be used in a future study to improve existing scaling laws for the outcome of collisions (e.g. Leinhardt and Stewart, 2012). (C) 2014 Elsevier Ltd. All rights reserved.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences > Theoretical Astrophysics and Planetary Science (TAPS)
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences

UniBE Contributor:

Jutzi, Martin

Subjects:

500 Science > 520 Astronomy
500 Science > 530 Physics

ISSN:

0032-0633

Publisher:

Elsevier

Language:

English

Submitter:

Katharina Weyeneth-Moser

Date Deposited:

15 Jun 2016 12:09

Last Modified:

06 Oct 2016 02:30

Publisher DOI:

10.1016/j.pss.2014.09.012

Web of Science ID:

000352674700002

ArXiv ID:

1502.01860v1

BORIS DOI:

10.7892/boris.81930

URI:

https://boris.unibe.ch/id/eprint/81930

Actions (login required)

Edit item Edit item
Provide Feedback