The role of material strength in collisions -- Comparing solid body and hydrodynamic physics for simulating collisions of planetesimals with icy shells
- Author(s)
- Thomas I. Maindl, Rudolf Dvorak, Roland Speith, Christoph Schäfer
- Abstract
Context. We investigate the effects of including material strength in multi-material planetesimal collisions. Aims. The differences between strengthless material models and including the full elasto-plastic model for solid bodies with brittle failure and fragmentation when treating collisions of asteroid-sized bodies as they occur frequently in early planetary systems are demonstrated. Methods. We study impacts of bodies of Ceres-mass with a solid rock target and an impactor with 30 wt% water content. The initial impact velocities and impact parameters are varied between the escape velocity $v_\mbox{esc}$ to about 6 $v_\mbox{esc}$ and from head-on collisions to close fly-bys, respectively. We simulate the collisions using our own SPH code using both strengthless material and the full elasto-plastic material model including brittle failure. Results. The qualitative analysis results in significant differences depending on whether material strength is included or not. This may be an effect of the relatively low-energy impacts that cannot destroy the solid material instantly. One of the most prominent differences is the higher degree of fragmentation and shattered debris clouds in the solid case. As opposed to giant impacts we also observe some water ice to get transferred from the impactor to the target.
- Organisation(s)
- Department of Astrophysics
- Publication date
- 12-2013
- Austrian Fields of Science 2012
- 103003 Astronomy
- Keywords
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/362e4d69-b832-4eca-b2bd-d9a5cd065b77