抄録
Estimation of ductile fracture behavior using GTN model in commercial FEA code was evaluated. The material properties of GTN model for Type 304 stainless steel were experimentally identified. Smooth bar and notched bar specimens were subjected to monotonic loading, and load-displacement curves were measured. Then, the tensile test was simulated. Material properties of GTN model were calculated from measured and simulated load-displacement curve with inverse analysis based on Bayes' theorem. Simulated load-displacement curve with GTN model of different curvature notched specimens were agreed well with the measured data. To verify the evaluation of ductile fracture using GTN model, flat plate with surface flaw specimen was subjected to monotonic loading. Ductile fracture of the flat plate was simulated using FEA with GTN model using calculated material properties. The simulated strain distribution was agreed to the measured strain distribution. The simulated load was less than the measured load at same displacement. The analysis with GTN model can estimate the load on the safe side and estimation of ductile fracture behavior.
