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In a protoplanetary disk, dust aggregates in the $\mu$m to mm size rangepossess mean collision velocities of 10 to 60 ms$^{-1}$ with respect to dm- tom-size bodies. We performed laboratory collision experiments to explore thisparameter regime and found a size- and velocity-dependent threshold betweenerosion and growth. By using a local Monte Carlo coagulation calculation andcomplementary a simple semi-analytical timescale approach, we show that erosionconsiderably limits particle growth in protoplanetary disks and leads to asteady-state dust-size distribution from $\mu$m to dm sized particles.

The physics of protoplanetesimal dust agglomerates. X. High-velocity collisions between small and large dust agglomerates as growth barrier