scholarly journals A Smeared Crack Modelling Approach for Aggregate Interlock and Mixed Mode Fracture of Concrete

2021 ◽  
Author(s):  
J. Ungermann ◽  
V. Adam ◽  
J. Hegger ◽  
M. Claßen
Keyword(s):  
Mixed Mode ◽  
Mixed Mode Fracture ◽  
Mode Fracture ◽  
Smeared Crack ◽  
Modelling Approach ◽  
Aggregate Interlock

scholarly journals Fictitious Rough Crack Model (FRCM): A Smeared Crack Modelling Approach to Account for Aggregate Interlock and Mixed Mode Fracture of Plain Concrete

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2774 ◽  
Author(s):  
Jan Ungermann ◽  
Viviane Adam ◽  
Martin Classen
Keyword(s):  
Mixed Mode ◽  
Stress Transfer ◽  
Plain Concrete ◽  
Mode I ◽  
Crack Model ◽  
Mixed Mode Fracture ◽  
Numerical Implementation ◽  
Normal Stresses ◽  
Mode Fracture ◽  
Aggregate Interlock

The intention of this paper is to clarify the mechanisms of mixed mode fracture and shear stress transfer in plain concrete. To capture these scarcely explored phenomena, a new mechanical formulation is proposed called the fictitious rough crack model (FRCM). The FRCM considers mode I deformations to control crack formation and residual tensile stress transfer, while mode II deformations are assumed to induce shear stress transfer along the crack surfaces and compressive normal stresses attributed to aggregate interlock. The fundamental idea of the FRCM is to combine these tension-softening and shear-transfer laws and to superimpose the emerging shear and normal stresses of both mechanisms in the crack. The paper illustrates the analytical development of the FRCM and its numerical implementation. Three well-known experimental benchmark problems (concrete panel test series by Nooru-Mohamed and by Hassanzadeh as well as aggregate interlock test series by Paulay and Loeber) are numerically addressed to test plausibility of FRCM results. The numerical implementation of the FRCM is capable of simulating the transition from mode-I fracture to mixed-mode fracture in the structural response and is also able to predict the crack path with reasonable agreement.

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.

Mixed-Mode Fracture of Hybrid Material Bonded Interfaces under Four-Point Bending

2011 ◽  
Vol 24 (2) ◽  
pp. 218-226 ◽  
Author(s):  
Pizhong Qiao ◽  
Fangliang Chen ◽  
Cole S. Hamey ◽  
Jialai Wang
Keyword(s):  
Hybrid Material ◽  
Mixed Mode ◽  
Mixed Mode Fracture ◽  
Mode Fracture ◽  
Four Point Bending
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