Multiaxial plasticity and fracture behavior of stainless steel 316L by laser powder bed fusion: Experiments and computational modeling

摘要: Abstract The multiaxial large deformation and ductile fracture behavior of laser powder bed fusion (L-PBF) additively manufactured austenitic 316L stainless steel was experimentally measured. Data from tests in two orientations, under five dissimilar stress states (shear, combined shear/tension loading states, plane strain tension, uniaxial tension) were used to calibrate validate anisotropic plasticity models, with different specimen geometries probe versus fracture. Shear softening, hypothesized be due shear band formation the material high initial dislocation density sub-micron cellular structures, observed dominated tests, modeled through adoption a damage criterion an model. Using experimental computational approach, isotropic Hosford-Coulomb modified Mohr-Coulomb models calibrated for both sample orientations. model best captures state dependent failure L-PBF 316L.