2. Homogeneous deformation
2.1 Rheological models
For the homogeneous domain, the model currently most widely used in the literature is the so-called free volume model, which to a first approximation consists of the product of three terms: a defect concentration (or shear zones), a thermal activation term and a hyperbolic sine stress term, which derives from the bias introduced into the activation energy by the work of stress.
Historically, this form of stress-strain rate relationship was proposed by Spaepen in 1977
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Homogeneous deformation
Heterogeneous deformation
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