Calibration of GTN damage model parameters using hydraulic bulge test
Keywords:Gurson, GTN damage model, identification, response surface methodology, anisotropy
. In this research, a new approach has been introduced for the identification of GTN damage model parameters. The response surface methodology was used for design of experiments and also for the calculation of the optimum values of the GTN model parameters. For the calibration of the parameters, the values of the major and minor limit strains were measured at the surface of hydraulic bulge test specimens at the onset of necking. Then, a response value was defined as a function of the limit strains. Using this approach, the values of GTN model parameters were calculated for the Bondal sandwich sheet (a sandwich sheet with DC06 skin sheets and a polymeric core layer). The results showed that the introduced approach is able to calibrate the GTN model parameters with a good accuracy, the surface strains, forming force and the onset of necking in the bulge test being predicted with an acceptable accuracy. Furthermore, the forming limit curve (FLC) of the Bondal sheet was constructed using the numerical simulation of Nakazima tests and by using the calibrated values of GTN model parameters. The results showed that the GTN model is able to predict the Bondal sheet FLC with a fair quality, especially in the plane strain and biaxial strain regimes.
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