In this paper, with Kamran Karimi and Jean-Louis Barrat, we solve numerically the dynamics of an amorphous solid under deformation in the quasistatic driving limit, by means of a finite elements technique. We study the noise statistics of the stress-strain signal in the steady state plastic flow, focusing on systems with low internal dissipation. We analyze the distributions of avalanche sizes and durations and the density of shear transformations when varying the damping strength. In contrast to avalanches in the overdamped case, dominated by the yielding point universal exponents, inertial avalanches are controlled by a non-universal damping dependent feedback mechanism; eventually turning negligible the role of correlations. Still, some general properties of avalanches persist and new scaling relations can be proposed.
It will be available soon in PRE.