Thermal noise and the branching threshold in brittle fracture
L. M. Sander (Physics Department, The University of Michigan), S.V., Ghaisas (Department of Electronics Science, University of Pune)
TL;DR
This paper investigates how thermal noise influences crack branching thresholds in brittle materials, potentially explaining why previous theories overestimate the threshold velocity.
Contribution
It introduces thermal noise as a factor that lowers the branching threshold, offering a new explanation for discrepancies in theoretical predictions.
Findings
Thermal noise significantly reduces the branching threshold.
The proposed model aligns better with experimental observations.
Thermal effects can account for overestimations in previous theories.
Abstract
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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