The paper presents a continuous-discontinuous numerical strategy for sim- ulating localized failure in structures made of quasi-brittle materials using finite elements. The strategy is based on observing acting stresses scenarios, when a diffuse degradation is followed by high deformation bands localizing in certain regions of the structure. The numerical strategy should encom- pass both situations in accordance with the material’s constitutive model. This objective is achieved by introducing a thin layer into a finite element at a certain level of the deformation process. In this study, the thin layer is modeled for the first time by an interphase mechanical device whose consti- tutive behavior is the same as the bulk material. This is possible since the interphase adds internal strains and stresses to the contact ones. As a conse- quence, no additional constitutive model and parameters are needed, unlike the zero-thickness interface or cohesive zone models commonly employed. The proposed numerical strategy is illustrated in detail both at the element level and at the structural level. A new crack tracking algorithm has been developed based on decomposition of the model into substructures to allow cracks to cross arbitrary meshes. Some benchmark examples are presented showing the mesh-size and mesh-bias independence of results, together with the convergence behavior of the model.

Marianna Puccia, A.S. (2023). Finite elements with embedded interphases for strain localization in quasi-brittle materials. ENGINEERING FRACTURE MECHANICS, 277 [10.1016/j.engfracmech.2022.108956].

Finite elements with embedded interphases for strain localization in quasi-brittle materials

Puccia, Marianna;Spada, Antonino
;
Giambanco, Giuseppe
2023-01-01

Abstract

The paper presents a continuous-discontinuous numerical strategy for sim- ulating localized failure in structures made of quasi-brittle materials using finite elements. The strategy is based on observing acting stresses scenarios, when a diffuse degradation is followed by high deformation bands localizing in certain regions of the structure. The numerical strategy should encom- pass both situations in accordance with the material’s constitutive model. This objective is achieved by introducing a thin layer into a finite element at a certain level of the deformation process. In this study, the thin layer is modeled for the first time by an interphase mechanical device whose consti- tutive behavior is the same as the bulk material. This is possible since the interphase adds internal strains and stresses to the contact ones. As a conse- quence, no additional constitutive model and parameters are needed, unlike the zero-thickness interface or cohesive zone models commonly employed. The proposed numerical strategy is illustrated in detail both at the element level and at the structural level. A new crack tracking algorithm has been developed based on decomposition of the model into substructures to allow cracks to cross arbitrary meshes. Some benchmark examples are presented showing the mesh-size and mesh-bias independence of results, together with the convergence behavior of the model.
Settore ICAR/08 - Scienza Delle Costruzioni
https://www.sciencedirect.com/science/article/pii/S0013794422006798?dgcid=author
Marianna Puccia, A.S. (2023). Finite elements with embedded interphases for strain localization in quasi-brittle materials. ENGINEERING FRACTURE MECHANICS, 277 [10.1016/j.engfracmech.2022.108956].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/576408
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