Bursting Prediction of Hydroforming Aluminium Alloy Tube based on Gurson-Tvergaard-Needleman Damage Model

Estimation of Damage Value of SAE4340 Steel and 5A02 Aluminium Alloy

“…The specimen was subjected to increasing load up to an equivalent total strain of 0.2. Equivalent stress at the point is 254 MPa which is in agreement with the results Teng et al obtained [10].…”

“…Porosity increases with increasing plastic strain up to a value of 0.0197. This is close to the critical porosity = 0.02, which Tang et al [10] obtained at a plastic strain of about 0.2. A damage value of 0.0335 was calculated from this porosity.…”

“…The first one is 5A02 aluminium alloy which is a highly ductile aluminium alloy well suitable for forming processes which require high plasticity. Material properties were taken from the analysis of Teng et al [10]. Parameters of the GTN model were determined there by a combined approach of microscopic evaluation and inverse method fitting simulation results to experimental data.…”

“…Parameters of the GTN model were determined there by a combined approach of microscopic evaluation and inverse method fitting simulation results to experimental data. Parameters K and M of the Ramberg-Osgood law were derived from the work hardening law [10]. Elastic modulus was assumed to be 70 GPa.…”

“…Chu and Needleman [4] obtained the following plastic strain controlled nucleation criterion as given by Eq. (10).…”