The Breakdown of Linear Elastic Fracture Mechanics near the Tip of a Rapid Crack
arXiv:0807.4866 · doi:10.1103/PhysRevLett.101.264301
Abstract
We present high resolution measurements of the displacement and strain fields near the tip of a dynamic (Mode I) crack. The experiments are performed on polyacrylamide gels, brittle elastomers whose fracture dynamics mirror those of typical brittle amorphous materials. Over a wide range of propagation velocities (), we compare linear elastic fracture mechanics (LEFM) to the measured near-tip fields. We find that, sufficiently near the tip, the measured stress intensity factor appears to be non-unique, the crack tip significantly deviates from its predicted parabolic form, and the strains ahead of the tip are more singular than the divergence predicted by LEFM. These results show how LEFM breaks down as the crack tip is approached.
arXiv comment4 pages, 4 figures, first of a two-paper series (experiments); no change in content, minor textual revisions
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Cited by in corpus (30)
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