Sheet metal experiences various stress states during plastic deformation, including uniaxial
compression, shear, uniaxial, plane strain and equibiaxial tension, but the existing yield …

An accurate description of yield surface is essential for the high-fidelity numerical analyses
of sheet metal forming processes. In this work, a simple coupling of anisotropic quadratic …

A simple analytical form for yield surface distortion under non-associated flow rule is
developed from the expression of the transformed second and third deviatoric stress …

A non-associated flow rule (non-AFR) constitutive model is proposed to describe the
evolving yield stress and plastic potential surfaces of sheet metal under plane stress …

Yield surfaces evolve depending on loading directions (anisotropic hardening) and stress
states (differential hardening) during plastic deformation of sheet metals. A new analytical …

The stress state-dependent plastic anisotropy of sheet metals has drawn significant
attention. Nevertheless, existing phenomenological plasticity models limitedly capture the …

This paper presents a user-friendly function under non-associate flow rule to capture
anisotropic hardening (or evolution of yield surface) and the curvature of yield loci for body …

This paper proposes a simple coupling of quadratic and non-quadratic yield functions with a
non-associated flow rule to describe the evolution of yield surface (or anisotropic …

An accurate description of the material yielding behavior is of great importance for a
trustworthy prediction of complicated forming processes via numerical analysis. For metal …

A fourth order polynomial yield criterion (Poly4) and a non-quadratic yield function are
coupled under associated flow rule to describe the evolution of anisotropic yielding behavior …