查看文章

The three-dimensional grain-averaged response of solid bar samples under non-proportional (NP) elastoplastic axial-torsional loading was investigated using in situ high energy diffraction microscopy (HEDM) and companion crystal plasticity finite element (CPFE) modeling. Important stress metrics including applied shear (σ θZ) and axial (σ ZZ) stress tensor components, stress and stress deviator tensor invariants (I 1, J 2, and J 3), von Mises equivalent stress (), maximum resolved shear stress (mRSS), stress triaxiality (η), and lode angle parameter () values were tracked for∼ 300 grains under two different loading conditions:(1) Torsion-dominated loading (low NP) and (2) Tension-torsion loading (high NP) in equiatomic NiCoCr, a representative multicomponent face-centered cubic (FCC) superalloy. Overall, significant stress localizations existed within both samples as evidenced by the radial dependence of grain …