“…Solutions can be obtained for J2-Flow theory (Krieg and Krieg, 1977), kinematic hardening (Krieg and Xu, 1997;Auricchio and Beirão da Veiga, 2003;Arioli et al, 2006), the Drucker-Prager model (Rezaijee-Pajand and Nasirai, 2008;Szabó, 2009), and potentially other plasticity models. These methods have demonstrated accuracy advantages over purely numerical integration algorithms and do not suffer the return mapping direction issues, but the range of models which can be integrated analytically or semi-analytically is limited.…”