Backward-Euler stress update algorithm for the original Cam-clay model with the vertex singularity

In fact, the theoretical foundation which can solve non-smooth yield surface using backward-Euler integration scheme has been substantially developed. Simo, Kennedy & Govindjee (1988) provides the algorithms for evaluating plastic flow for constitutive laws with the intersecting yield surfaces by employing Koiter’s associated flow rule (Koiter 1953).