Evaluation of impact ductile fracture behaviour of low carbon austenitic stainless steel SUS304L using damage mechanics model

To clarify the applicability of Gurson-Tvergaard-Needleman (GTN) model for impact ductile fracture behaviour, SHB test was reproduced by finite element analysis (FEA). The strain-rate dependence strength austenitic stainless steel JIS SUS304L obtained tensile tests at quasi-static strain rate and rate. CowperSymonds power law, which takes into strength, GTN implemented in commercial FEA code were used to simulate ductile-fracture behaviour. parameters determined minimizing difference between simulated measured stress-strain curve using response surface method. from result. Simulation results did not occur necking on specimen. surfaces observed SEM micrograph. appearance since dimples are observed, regardless It is necessary adjust parameter accelerate nucleation void. By identifying consideration including would be possible improve simulation accuracy