Scaling and dynamics of an interfacial crack front
Source abstract
Abstract
We report on in situ observations with a high speed CCD camera of an in-plane crack propagating through a transparent heterogeneous Plexiglas block. The toughness is controlled artificially and fluctuates spatially as a random noise. A stable crack in mode I was monitored by loading the system by an imposed displacement. We show that the movement of the fracture front is controlled by local instabilities triggered by the depinning of asperities even for very slow loading. Development of crack roughness is described in terms of a Family-Vicsek scaling with a roughness exponent ζ=0.60 and a dynamical exponent κ=1.2. We also study the system numerically using a Green function technique. We find ζ=0.6 and κ=1.5 in contrast to earlier numerical studies that reported a much smaller roughness exponent ζ≈1/3. We discuss this discrepancy.
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Research context
OpenAlex topics: Theoretical and Computational Physics · Random lasers and scattering media · Landslides and related hazards
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References (34)
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