Abstract
This article discusses the construction of constitutive equations for the quasi-static deformation process of semi-brittle materials from the onset to the state pre ceding final failure. The simple connection between mesomechanical and phenomenologi cal modelling of damage is possible. The generalization of the damage measurement idea by unloading modulus [31] allows one to follow the whole non-linear unloading process in the multi-axial state of stress, specifying all mechanisms contained in it.
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