| Application of the GTN model to predict the forming limit diagram of IF-Steel
Mahmoud Abbasi*, Mohammad A. Shafaat, Mostafa Ketabchi, Davoud F. Haghshenas and Mohammad Abbasi
The Journal of Mechanical Science and Technology, vol. 26, no. 2, pp.345-352, 2012
Abstract : Forming limit diagrams (FLDs) are extensively used in industries, particularly the auto industry. The establishment of these diagrams
using a predictive approach can lead to reduction in both cost and time. In the present work, Gurson-Tvergaard-Needleman (GTN), a
porosity-based model, was used to predict the FLD of an interstitial-free steel via finite element simulation. Optimum values of the GTN
model were obtained by applying a response surface methodology (RSM) based on central composite design. Results show that RSM is a
good method for an appropriate determination of the GTN model parameters, such as initial void volume fraction, effective void volume
fraction, critical void volume fraction, and final void volume fraction. Furthermore, the experimental FLD of the specimen steel was
considerably predicted using the obtained GTN model parameters.
Keyword : Ductile fracture; Forming limit diagram; GTN model; Response surface methodology |
