  The classic elastoplastic-damage constitutive model neglects the effects of
loading histories. But in fact, more and more experiments results show that the
states of stress can significantly affect the response of metals not only in
the plasticity but also in the damage evolution. This paper presents an
elasto-plastic fully coupled ductile damage constitutive model which considers
the corrections of the metal plasticity and the damage evolution through the
states of stress. The stress triaxiality and the Lode angle are frequently used
to characterize the state of stress. The correction of metal plasticity is
achieved by applying a new flow stress model associated with the stress
triaxiality and Lode angle. A stress state parameter which depends on the
function of stress triaxiality and Lode angle is also proposed. In order to
calibrate the damage evolution, the stress state parameter is introduced into
the Chaboche damage model. The experiment results of aluminium 2024-T351 are
used to validate the proposed constitutive model.
