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P. Pivonka, H.A. Mang:
"Theoretical and Algorithmic Aspects of a 3D Material Model for Concrete under Compressive Stresses, Part 1";
Report for Institute for Strength of Materials, Vienna University of Technology, Vienna, Austria; 1997.

This report contains the algorithmic formulation of a 3D plasticity model (Leon model) based on the closest-point projection algorithm. The model was previously proposed by Etse and Willam. It accounts for the dependence of the triaxial concrete strength on the Lode angle together with a control of the inelastic volume changes in the hardening/softening regime with a non-associate flow rule.

Keywords: concrete, Picard-algorithm, Leon Model