Journal
EUROPHYSICS LETTERS
Volume 62, Issue 3, Pages 320-326Publisher
EDP SCIENCES S A
DOI: 10.1209/epl/i2003-00398-1
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Slow crack growth in a model of homogeneous brittle elastic material is described as a thermal activation process where stress fluctuations allow to overcome a breaking threshold through a series of irreversible steps. We study the case of a single crack in a. at sheet for which analytical predictions can be made, and compare them with results from the equivalent problem of a 2D spring network. Good statistical agreement is obtained for the crack growth pro. le and final rupture time. The specific scaling of the energy barrier with stress intensity factor appears as a consequence of irreversibility. In addition, the model brings out a characteristic growth length whose physical meaning could be tested experimentally.
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