Comparison of GTN damage models for sheet metal forming

Abstract

The Gurson-Tvergaard-Needleman (GTN) damage model was developed basing on anisotropic yield criterion to predict the damage evolution for anisotropic voided ductile materials. Hill's quadratic anisotropic yield criterion (1948) and Barlat's 3-component anisotropic yield criterion (1989) were used to describe the anisotropy of the matrix. User defined subroutines were developed using the above models. Taking the benchmark of NUMISHEET'93 square cup deep drawing as an example, the effect of matrix plastic anisotropy on a ductile material was studied. The predicted result by Barlat'89-GTN model has a better agreement with the experimental data than that by Hill'48-GTN and the original GTN model.

Numerical determination of the forming limit curves of anisotropic sheet metals using GTN damage model

“…Wang et al (2004) the directional parameters in the model proposed by Liao et al (1997) with the average anisotropy parameter. Chen and Dong (2008) extended the GTN model to characterize the matrix material through Hill quadratic (Hill, 1948) and Barlat-Lian 3-component (Barlat and Lian, 1989) expressions of the equivalent stress. Chen and Dong (2009) proposed extensions of the GTN potential based on Hill's quadratic anisotropic expression of the equivalent stress (Hill, 1948).…”

Experiment and Meso-Damage Finite Element Analysis of Uniaxial Tension of Galvanized Steel Sheets

“…Combinding the uniaxial tensile test with the numerical simulation, the GTN damage model parameters are determined through the finite element reverse method. The detailed values are in Table 3 [15] , where 0 f represents the initial void volume fraction. Simulation results coincide with the galvanized steel uniaxial tensile test, from the initial uniform deformation, necking, shear zone, and ultimately the process of fracture.…”