New convex yield functions for orthotropic metal plasticity

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A virtual laboratory using high resolution crystal plasticity simulations to determine the initial yield surface for sheet metal forming operations (2016, background): “For example, many possible combinations exist, r-values, normalized yield stresses, and virtual test data with different weights that could potentially yield adequate fitting fidelity (Grytten et al., 2008; Rabahallah et al., 2009; Aretz and Barlat, 2013; Zhang et al., 2015a; Gawad et al., 2015).”
Asymmetric yield function based on the stress invariants for pressure sensitive metals (2014, background): “Accordingly, various orthotropic yield functions (Hill, 1948, 1979, 1990, 1993; Hosford, 1979; Barlat and Lian, 1989; Barlat et al., 1991, 1997, 2003, 2005; Karafillis and Boyce, 1993; Banabic et al., 2005; Aretz and Barlat, 2013; Yoshida et al., 2013; Soare and Barlat, 2010) were developed for accu”