Inverse Technique Identification of Material Damage Law with Experimental Validation

Advanced design in the case of metal forming processes requires knowledge of the damage law of the material used. Experimental identification of the damage law parameters requires suitable tests. The aim of this study is to develop and implement into a finite-element (FE) code (ABAQUS/Standard) a numerical algorithm allowing for the identification of Lemaitre damage law parameters by the inverse technique. The constants of the damage law are currently obtained by performing several complicated and sometimes costly experiments. The physical damage parameters are obtained in such a way that the FE predicted curve will fit the experimental plot deduced from a tensile material test. The material constants values were validated by comparing numerical results with the experimental results identified by a series of tensile tests performed on the same specimen.