A plastic nonlocal damage model

✍ Scribed by Daniela Addessi; Sonia Marfia; Elio Sacco

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 727 KB
• Volume: 191
• Category: Article
• ISSN: 0045-7825
• DOI: 10.1016/s0045-7825(01)00325-5

✦ Synopsis

In the present paper, a plastic nonlocal damage model is proposed for studying the mechanical response of structural elements made of cementitious materials. A new isotropic damage model, which is able to describe the behavior of a wide class of cementitious materials, is presented. A regularization technique, based on the introduction of the damage Laplacian in the damage limit function, is adopted to overcome the analytical and computational problems induced by the softening constitutive law. A Drucker±Prager type of plastic limit function is proposed considering isotropic hardening. A numerical procedure, based on an implicit `backward-Euler' technique for the time integration of the plastic and damage evolution equations, is presented. To solve each nonlinear step, a pre-dictor±corrector iterative method is developed within the splitting method. In particular, the damage evolution is determined solving a constrained minimization problem of a convex functional. The proposed algorithm is implemented in a ®nite element code and it is used to study the structural behavior of elements made of masonry materials.