Polycrystalline numerical simulation of variable amplitude loading effects on cyclic plasticity and microcrack initiation in austenitic steel 304L

摘要: Abstract This paper presents a numerical simulation of variable amplitude loading effects on cyclic plasticity and microcrack initiation in 304L steel based the polycrystal plastic theory. A volume material corresponding to real microstructure, containing about 70 grains, has been modeled with crystal approach. The model takes account dislocation densities 12 slip systems, isotropic kinematic hardening, grain sizes, orientations elastic anisotropy. parameters used this for were obtained through experimental measurements literature or identified an inverse procedure. In work, two load conditions considered, first case, total strain changed from ±0.3% ±0.7% (overload) back second it ±0.1% ±0.5% ±0.1%. Results demonstrated that overload are different these cases depend specific conditions.