Characterization of aluminum alloys using a 3D full field measurement

In the 2009 SEM Conference in Albuquerque, a measurement technique that combines the digital image correlation and the fringe projection was proposed by the authors to evaluate the 3D displacement of a specimen during a tensile test: the DIC is used to measure the in-plane displacement on both faces of the specimen while the fringe projection and phase shifting is used to reconstruct the shape with a high spatial resolution. In this work, the mentioned experimental technique was employed to characterize the plastic behavior of an aluminum alloy. First a 3D mesh was utilized to regularize the measured data and to get the strain field inside the specimen, in such way the full strain history of the test was reconstructed until failure. Then the Virtual Fields Method was adopted to identify the parameters of an anisotropic plasticity model. A comparison with FEM was also made to assess the correctness of the identified parameters.