Thermal noise and the branching threshold in brittle fracture

Details Thermal noise and the branching threshold in brittle fracture Thermal noise and the branching threshold in brittle fracture

1999-01-18

arxiv.org/abs/cond-mat/9901166v1

Physics

Condensed Matter

Materials Science

4 pages, 5 figures, Latex

Scientific paper

10.1103/PhysRevLett.83.1994

Many studies have confirmed that cracks in brittle materials branch when the crack speed exceeds a certain threshold velocity, but the value of that threshold is not understood. Almost all theoretical calculations overestimate the threshold by factors of two or more. We show that thermal noise can reduce the threshold by a substantial amount, and we propose that this effect can account for the discrepancy.

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