A localizing gradient enhanced isotropic damage model with Ottosen equivalent strain for the mixed-mode fracture of concrete

2021 ◽  
pp. 106410
Author(s):  
Amit Subhash Shedbale ◽  
Gang Sun ◽  
Leong Hien Poh
Keyword(s):  
Mixed Mode ◽  
Damage Model ◽  
Equivalent Strain ◽  
Mixed Mode Fracture ◽  
Mode Fracture ◽  
Isotropic Damage

Modelling Mixed-Mode Fracture Using an Energy-Based Damage Model

2014 ◽  
Vol 627 ◽  
pp. 49-52
Author(s):  
J. Alfaiate ◽  
D. Dias-da-Costa ◽  
L.J. Sluys
Keyword(s):  
Mixed Mode ◽  
Damage Model ◽  
Constitutive Relationship ◽  
Mixed Mode Fracture ◽  
Limit Surface ◽  
Proportional Loading ◽  
Internal Damage ◽  
Mode Fracture ◽  
Discrete Crack ◽  
Constitutive Tensor

In this work, a new damage model for mixed-mode fracture in the scope of the discrete crack approach is introduced. An energy-based internal damage variable is adopted. In the model, deformation-driven loading surfaces are defined and the dual loading surfaces in the traction space are derived. Under proportional loading, it is found that the constitutive relationship is symmetric. Further enrichment of the energy-based variable on the traction field is also introduced, allowing for a better approximation of: i) the limit surface defined in traction space and ii) non-proportional loading. However, in this case symmetry of the constitutive tensor is lost.

scholarly journals A quasi-monolithic phase-field description for mixed-mode fracture using predictor–corrector mesh adaptivity

2021 ◽  
Author(s):  
Meng Fan ◽  
Yan Jin ◽  
Thomas Wick
Keyword(s):  
Phase Field ◽  
Mixed Mode ◽  
Splitting Method ◽  
Fracture Model ◽  
Mixed Mode Fracture ◽  
Energy Splitting ◽  
Mesh Adaptivity ◽  
Mode Fracture ◽  
New Model ◽  
Fracture Models

AbstractIn this work, we develop a mixed-mode phase-field fracture model employing a parallel-adaptive quasi-monolithic framework. In nature, failure of rocks and rock-like materials is usually accompanied by the propagation of mixed-mode fractures. To address this aspect, some recent studies have incorporated mixed-mode fracture propagation criteria to classical phase-field fracture models, and new energy splitting methods were proposed to split the total crack driving energy into mode-I and mode-II parts. As extension in this work, a splitting method for masonry-like materials is modified and incorporated into the mixed-mode phase-field fracture model. A robust, accurate and efficient parallel-adaptive quasi-monolithic framework serves as basis for the implementation of our new model. Three numerical tests are carried out, and the results of the new model are compared to those of existing models, demonstrating the numerical robustness and physical soundness of the new model. In total, six models are computationally analyzed and compared.

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