A constitutive model describing the necking behaviour of aluminium during tension and creep

The analysis of the necking process in rods under tension has been the subject of numerous studies but the precision with which the phenomenon is described remains insufficient. The improvements to the analysis, put forward in this work, are linked to the laws of behavior. The studies carried out use mainly behavior relationships under the integrated form of the type sigma = sigma ( epsilon , epsilon ) or sigma = sigma ( epsilon , epsilon , T). The law of behavior used in particular is of the form sigma ( rho sub i , epsilon , T) where p sub i (i=1 to n) represent microstructural parameters. The necking phenomenon is examined through an analysis of deformation localization, taking into account pre-existing defects. The analysis is then applied to constant-strain-rate tension test and also to creep tests.