Uniaxial Mechanical Behavior of 316LN Stainless Steel Based on Crystal Plasticity Finite Element Method

To describe the uniaxial mechanical behavior of 316LN stainless steel more accurately，a polycrystalline cyclic plasticity constitutive model is constructed based on the Ahmadzadeh-Varvani（A-V）kinematic hardening rule in the framework of the rate-dependent crystal plasticity theory. The constitutive model is implemented to the finite element software ABAQUS through the UMAT，and a two-dimensional polycrystalline finite element model is established through Voronoi diagrams. And then the deformation behavior of 316LN stainless steel is simulated under different loading rates，strain cycles and asymmetric stress cycles，respectively. The simulated results compared with the experimental data show that under the uniaxial tensile condition，the stress errors of both fluctuate around±0. 9%，and the maximum stress error is only 1. 9%；under the strain cycle condition，the maximum stress error between the two appears in the 5th cycle，with 11. 4% and 12. 2% errors in the tensile and compression phases，respectively，and 7. 4% and 7. 9% errors in the tensile and compression phases，respectively，after cycle stabilization. Under the asymmetric stress cycle condition，the errors of both mainly appear in the hysteresis loop width，the simulated hysteresis loop width is narrower，but the error of the hysteresis loop evolution trend is smaller. © 2024 Northeast University. All rights reserved.