A fracture energy–based viscoelastic–viscoplastic–anisotropic damage model for rate-dependent cracking of concrete

Daneshyar, Alireza; Ghaemian, Mohsen; Du, Chengbin

doi:10.1007/s10704-022-00685-5

Cited by 2 publications

(1 citation statement)

References 87 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An experimental and analytic study of concrete fracture energy was carried out, and mixed mode concrete fracture was examined by comparing the experimental and model results. A brittle diagonal failure was observed [33].…”

Section: Introductionmentioning

confidence: 99%

Multigene Genetic Programming Based Prediction of Concrete Fracture Parameters of Unnotched Specimens

Sudhir

Beulah

2023

Civ Eng J

View full text Add to dashboard Cite

This study explores the fracture energy of notched and unnotched concrete specimens subjected to the classical three-point bend test, instantiating a gradational step in the continued development of concrete fracture mechanics. An experimental campaign involving 18 notched test specimens and nine unnotched specimens of three different grades of concrete, an examination of the existing literature models for unnotched specimens, and a novel Multigene Genetic programming (MGGP) based concrete fracture energy model for unnotched specimens are integral to this study. As a salient result, the multiple approaches to quasi-brittle materials adopted in the study, highlighted the criticality of the determination of fracture energy, tensile strength and characteristic length for the crack width study. The failure modes of notched and unnotched specimens were found to be similar. The reported literature has mainly focused on a limited number of fracture energy influencing parameters. Therefore, six impact parameters have been chosen and incorporated into the present study to provide a more acceptable explanation of concrete fracture behaviour. A sensitivity analysis of the parameters and an error analysis of the model undertaken have established the accuracy and robustness of the developed MGGP model. Doi: 10.28991/CEJ-2023-09-02-011 Full Text: PDF

show abstract

Section: Introductionmentioning

confidence: 99%

Multigene Genetic Programming Based Prediction of Concrete Fracture Parameters of Unnotched Specimens

Sudhir

Beulah

2023

Civ Eng J

View full text Add to dashboard Cite

show abstract

From ductile damage to unilateral contact via a point-wise implicit discontinuity

Daneshyar,

Herrmann,

Kollmannsberger

2023

Comput Mech

View full text Add to dashboard Cite

Ductile damage models and cohesive laws incorporate the material plasticity entailing the growth of irrecoverable deformations even after complete failure. This unrealistic growth remains concealed until the unilateral effects arising from the crack closure emerge. We address this issue by proposing a new strategy to cope with the entire process of failure, from the very inception in the form of diffuse damage to the final stage, i.e. the emergence of sharp cracks. To this end, we introduce a new strain field, termed discontinuity strain, to the conventional additive strain decomposition to account for discontinuities in a continuous sense so that the standard principle of virtual work applies. We treat this strain field similar to a strong discontinuity, yet without introducing new kinematic variables and nonlinear boundary conditions. In this paper, we demonstrate the effectiveness of this new strategy at a simple ductile damage constitutive model. The model uses a scalar damage index to control the degradation process. The discontinuity strain field is injected into the strain decomposition if this damage index exceeds a certain threshold. The threshold corresponds to the limit at which the induced imperfections merge and form a discrete crack. With three-point bending tests under pure mode I and mixed-mode conditions, we demonstrate that this augmentation does not show the early crack closure artifact which is wrongly predicted by plastic damage formulations at load reversal. We also use the concrete damaged plasticity model provided in Abaqus commercial finite element program for our comparison. Lastly, a high-intensity low-cycle fatigue test demonstrates the unilateral effects resulting from the complete closure of the induced crack.

show abstract

A fracture energy–based viscoelastic–viscoplastic–anisotropic damage model for rate-dependent cracking of concrete

Cited by 2 publications

References 87 publications

Multigene Genetic Programming Based Prediction of Concrete Fracture Parameters of Unnotched Specimens

Multigene Genetic Programming Based Prediction of Concrete Fracture Parameters of Unnotched Specimens

From ductile damage to unilateral contact via a point-wise implicit discontinuity

Contact Info

Product

Resources

About