Plastic deformations in body-centered-cubic (BCC) crystals have been ofcritical importance in diverse engineering and manufacturing contexts acrosslength scales. Numerous experiments and atomistic simulations on BCC crystalsreveal that classical crystal plasticity models with the Schmid law are notadequate to account for abnormal plastic deformations often found in thesecrystals. In this paper, we address a continuum mechanical treatment ofanomalous plasticity in BCC crystals exhibiting non-Schmid effects, inspiredfrom atomistic simulations recently reported. Specifically, anomalous featuresof plastic flows are addressed in conjunction with a single crystalconstitutive model involving two non-Schmid projection tensors widely acceptedfor representing non-glide components of an applied stress tensor. Further,modeling results on a representative BCC single crystal (tantalum) arepresented and compared to experimental data at a range of low temperatures toprovide physical insight into deformation mechanisms in these crystals withnon-Schmid effects.
展开▼
