Fig. 5From: Numerical investigation of dynamic brittle fracture via gradient damage modelsCrack speeds as a function of the loading velocity. The crack speed \(\frac{\mathrm {d} l}{\mathrm {d} t}\) with respect to t is indicated in a, while in b the crack speed \(\frac{\mathrm {d} l}{\mathrm {d} U}\) with respect to U is shown. Comparison with the 1-d analytical solution (27) based on the Griffith’s criterionBack to article page