Abstract
AbstractA recently developed two‐level cooperative model of stress relaxation in solids is shown to describe correctly the experimental finding F/σ ≈ 0.1, with F denoting the maximum slope of the relaxation curves in a σ (stress)–ln t (time) diagram, and σ the initial effective stress. The basic idea underlying the model is the notion of multiple transitions between the two levels, such transitions being induced by spontaneous events by a similar mechanism as in B‐E statistics. The spectrum of relaxation times, τ, is determined by the size distribution of the clusters, the τ values being inversely proportional to the cluster size. A subdivision of the relaxing system into smaller cooperating regions is one of the consequences of the constancy of the ratio F/σ.
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