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We investigate the outcome of collisions of Ceres-sized planetesimalscomposed of a rocky core and a shell of water ice. These collisions are notonly relevant for explaining the formation of planetary embryos in earlyplanetary systems, but also provide insight into the formation of asteroidfamilies and possible water transport via colliding small bodies. Earlierstudies show characteristic collision velocities exceeding the bodies' mutualescape velocity which - along with the distribution of the impact angles -cover the collision outcome regimes 'partial accretion', 'erosion', and'hit-and-run' leading to different expected fragmentation scenarios. Existingcollision simulations use bodies composed of strengthless material; we studythe distribution of fragments and their water contents considering the fullelasto-plastic continuum mechanics equations also including brittle failure andfragmentation.

Fragmentation of colliding planetesimals with water content