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The ductile failure process on macroscopic scale can be successfully described with a model based on the
microscopic mechanism of nucleation and growth of microvoids. All the proposed constitutive models
require the determination of some constants characteristic of the material under investigation. In this paper
a non-linear damage model, material independent, was chosen. A number of experimental tests, to determine
the damage kinetic evolution equation with plastic strain and the triaxiality effect on damage parameters,
were performed. Experimental result seems to confirm that triaxial state of stress, even if strongly reduces
the strain to failure, does not affect the value of the damage threshold strain at which damage process
initiates.