Prediction and Validation of Stress Triaxiality Assisted by Elasto-Visco-Plastic Polycrystal Model

The Delta EVPSC numerical code based on the elasto-visco-plastic HEM (Homogeneous Effective Medium) provides a multiscale constitutive modeling framework that is suitable for describing a wide range of mechanical behaviors of polycrystalline metals. In this study, an AA6061-T6 aluminum sample was chosen to validate the predictive capability of the Delta EVPSC stand-alone (Delta EVPSC-SA) code on stress triaxiality and its evolution until fracture. The model parameters were calibrated by fitting the uniaxial flow stress-strain curve, and the initial crystallographic orientation distribution (COD) was obtained using X-ray diffraction and electron backscattered diffraction (EBSD) methods. The statistical representativeness of the COD was further examined by comparing the experimental R-values with model predictions based on a set of CODs obtained via the two mentioned diffraction methods. The results suggest that the X-ray scan does not represent the texture very well, and instead, an entire cross-sectional EBSD scan is required, even though the texture gradient along the through-thickness direction is not very significant. The model-calculated triaxiality based on the Delta EVPSC-SA code was verified by comparison with the experimental results from the uniaxial tension, the notched tension, and the plane strain tests. The results were in good agreement with the Delta EVPSC finite element (FE) simulation results and other similar experimental results reported in the literature.

Automated summary

The Delta EVPSC numerical code was used to simulate the AA6061-T6 aluminum alloy, validating its predictive capability in stress triaxiality and fracture evolution. By calibrating the model parameters and obtaining the initial crystallographic orientation distribution through X-ray diffraction and electron backscattered diffraction, the study found that the EBSD scan of the entire cross-section represents the texture more accurately. Comparison with experimental results confirmed the good agreement between the simulation and other experimental results.