Predicting ductile tearing of additively manufactured 316L stainless steel

摘要

Predictions for ductile tearing of an additively-manufactured 316L metal structure were generated using a unified creep plasticity damage (UCPD) model and finite element models constructed using 4-node tetrahedral or 8-node hexahedral elements. Uniaxial tension and notched tension experiments were simulated to obtain material parameters for the UCPD model. Results from these simulations revealed that accurate prediction of material bifurcations prior to the initiation of ductile tears are critically important for generating accurate ductile tearing predictions. This occurs because material bifurcations lead to deformation localization which is followed by ductile tearing. Crack path predictions were found to be sensitive to the finite element mesh with cracks preferring to run along mesh lines. Finally, the unloading slope of the load displacement curve was found to be sensitive to element failure modeling.