From Quasi-Static to Rapid Fracture

Fracture through cavitation in a metallic glass

“…≈ 0.55) was observed on metallic fracture surfaces [8][9][10] at small length scales/low crack velocities. It was shown that the crossover length separating this regime from the ζ 0.75 regime at higher length scales was inversely proportional to the average crack velocity V .…”

“…Bonamy et al [12] have shown that the set of exponents {ζ 0.75, β 0.6} define a universality class corresponding to length scales smaller than the process zone size, where non linear elastic processes take place. Above this process zone size, another university class is observed [12,20,21] characterized by a set of exponents {ζ 0.4, β 0.5} that can be understood theoretically within the Linear Elastic Fracture Mechanics framework.A third regime arises at very small length scales, characterized by a roughness index close to ζ ≈ 0.5, observed in a metallic alloy and in a soda-lime silicate glass [8][9][10] along a direction perpendicular to the direction of crack propagation. This regime was suggested [22] to be…”

“…A third regime arises at very small length scales, characterized by a roughness index close to ζ ≈ 0.5, observed in a metallic alloy and in a soda-lime silicate glass [8][9][10] along a direction perpendicular to the direction of crack propagation. This regime was suggested [22] to be (a) E-mail: elisabeth.bouchaud@cea.fr characteristic of small damage cavities, i.e.…”

Disorder-induced roughening in the three-dimensional Ising model

“…In contrast in the ͕111͖ orientation, the interface is always strongly disordered. This has direct implications for recent measurements 14,15,17,18 of the roughness of fracture surfaces, where ''quasistatic'' cleavage along the ͕100͖ orientation could have different roughness than fracture occuring at other orientations, at least for weakly disordered materials. …”

“…16,1 The fracture surface problem has in particular attracted a great deal of recent attention, with a continuing debate about whether the fracture surface exponents are controlled by disorder ͑minimal surfaces͒, by crack dynamics, or by a combination of the two. 17,18 Here we calculate the roughness of minimal surfaces and hence show that, if disorder is dominant, then the average orientation of a fracture surface is important in the analysis of its roughness. This factor has not been assessed in the experiments so far.…”