Experimental And Numerical Characterization Of Damage Evolution In Steels.

Abstract

This paper presents an experimental and numerical characterization of ductile
damage evolution in steels subjected to large plastic deformations. To this end, a set of tensile
tests combining load-unload cycles is firstly carried out in order to evaluate the deterioration
exhibited by the Young’s modulus for increasing levels of plastic deformation. This task
allows, in turn, to derive the characteristic parameters involved in a well-established
evolution equation for the isotropic damage variable. All these material parameters are the
basic data to be considered in the simulations that are performed afterwards: the analysis of
the tensile test is mainly aimed at assessing the proposed characterization while the
modelling of the flattening process of a cylinder is considered to discuss the possibilities and
limitations of the constitutive model.