Abstract

It is found that the results of the experiments made with constant strain-rate give also the creep functions. This is determined with three different assumptions on the creep modelling function, and it is seen that, to find the long-term reaction of the material, experiments with duration longer than that of these already carried out are needed. It is also found that the classic stress-strain relations representing the anelasticity of materials imply stress hardening and possibly fatigue; a method to estimate the number of cycles which could give fatigue is suggested. As an application the creep of polycrystalline halite is obtained finding also its temperature dependence and the relation between the activation energy and the temperature.

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