Moving from phenomenological models to physics-based ones. This involves solving the Schmid law on individual slip systems. Computationally expensive, but essential for texture evolution and anisotropic behavior.
For students and PhD candidates, PDF textbooks and lecture notes are indispensable. They provide the rigorous mathematical derivations of yield criteria (like von Mises and Tresca) and hardening rules (isotropic, kinematic, and mixed hardening). Digital formats allow for quick searching of formulas, such as the flow rule or the Kuhn-Tucker loading/unloading conditions. Moving from phenomenological models to physics-based ones