A CDM Approach of Ductile Damage with Plastic Compressibility

摘要

The paper proposes a modified formalism of continuum damage mechanics in order to describe plastic compressibility in the context of ductile damage. The model uses two damage state variables, one of them playing role of porosity in micromechanics based approaches like Gurson’s model. Various versions of the model are determined and compared with Gurson’s model, in terms of the constitutive responses for various loading conditions, as well as for simple structural examples like a free and a clamped plate under plane strain, and an axisymmetric notched bar under tension. The classical CDM is also applied and some advantages of the proposed approach are underlined.