Vegter Yield-Surface Comparator

FIG 1 · VEGTER 2017 PLANE-STRESS YIELD LOCUS

FIG A · YIELD LOCUS · σ_xx vs σ_yy · plane stress

Vegter locus von Mises ref Anchor stresses (RD · TD · DD · EB · PS · SH)

—

σ_RD / σ₀

Uniaxial RD

—

σ_TD / σ₀

Uniaxial TD

—

σ_DD / σ₀

Diagonal 45°

—

σ_b / σ₀

Equibiaxial

§ PARAMETER PLAYGROUND

r₀ — Lankford (RD)

1.80

r₄₅ — Lankford (DD)

1.20

r₉₀ — Lankford (TD)

2.20

σ_b/σ₀ — Biaxial ratio

1.040

n — Hardening exponent

0.220

Reference: Vegter & van den Boogaard (2006) "A plane stress yield function for anisotropic sheet material by interpolation of biaxial stress states", Int. J. Plasticity 22, pp. 557–580. DOI 10.1016/j.ijplas.2005.04.009