Yield surface of the CDPM model

Yield surface visualisation of CDPM, from the Grassl Group (Concrete Mechanics for Performance Based Design) at the University of Glasgow.

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The yield surface (f = 0) of the damage-plasticity model CDPM (Grassl & Jirásek, 2006) is based on the Menétrey-Willam (1995) failure criterion. It depends on an eccentricity parameter e and a hardening parameter q_h. The videos below illustrate the influence of these two parameters.

Influence of eccentricity e

The eccentricity parameter e is varied from 0.5 to 1 for q_h = 1. For e ≈ 0.5, the deviatoric section has a triangular shape near the origin; for e = 1, it is circular. For concrete, values close to 0.5 are used, giving an almost triangular deviatoric section with smooth compressive meridians.

Influence of hardening parameter q_h

The parameter q_h is varied from 0.1 to 1 with e = 0.51. For q_h < 1, the yield surface is closed on the hydrostatic axis.