Abstract
To clarify the applicability of the Gurson-Tvergaard-Needleman (GTN) model for impact ductile fracture behaviour, SHB test was reproduced by finite element analysis (FEA). The strain-rate dependence of the strength for austenitic stainless steel JIS SUS304L was obtained by tensile tests at quasi-static strain rate and impact strain rate. The CowperSymonds power law, which takes into the strain-rate dependence of strength, and the GTN model implemented in the commercial FEA code were used to simulate for impact ductile-fracture behaviour. GTN model parameters were determined by minimizing the difference between the simulated and measured stress-strain curve using response surface method. SHB test was simulated using GTN model obtained from quasi-static tensile test result. Simulation results did not occur the necking and fracture on the specimen. The fracture surfaces were observed by SEM micrograph. The appearance of ductile fracture since dimples are observed, regardless of the strain rate. It is necessary to adjust the parameter to accelerate the nucleation of the void. By identifying the GTN parameters in consideration of the strain rate dependence including impact strain rate. It would be possible to improve the simulation accuracy of impact ductile fracture behaviour.
Highlights
The fracture evaluation method was required to evaluate for structural integrity for infrastructural equipment in the severe accident that exceeds design standards
As one of the models of damage mechanics applied to the simulation of microscopic ductile-fracture behaviour, the Gurson model, which is based on voids, has been proposed
GTN (Gurson-TvergaardNeedleman) model that is based on the Gurson model, considers the influence of nucleation, growth, and coalescence of a void and fracture behaviour was reproduced on simulation [2]
Summary
The fracture evaluation method was required to evaluate for structural integrity for infrastructural equipment in the severe accident that exceeds design standards. These requirements were social trends for safety and revised regulatory standards. It has become necessary to assess the safety of the materials and the evaluate fractures behaviour of existing structures and their equipment. As one of the models of damage mechanics applied to the simulation of microscopic ductile-fracture behaviour, the Gurson model, which is based on voids, has been proposed. A numerical simulation using the GTN model has been used to simulate for ductile-fracture behaviour and assess severe accidents for infrastructure equipment [3]. In order to clarify the applicability of the GTN model to impact ductile fracture behaviour, SHB test was reproduced by fracture simulation
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
