scholarly journals Mesoscopic investigation of size effect in notched concrete beams: The role of fracture process zone

2019 ◽  
Vol 212 ◽  
pp. 136-152 ◽  
Author(s):  
Rongxin Zhou ◽  
Han-Mei Chen
Keyword(s):  
Size Effect ◽  
Fracture Process ◽  
Fracture Process Zone ◽  
Concrete Beams ◽  
Process Zone

Size effect analysis of quasi-brittle fracture with localizing gradient damage model

2021 ◽  
pp. 105678952098387
Author(s):  
Yi Zhang ◽  
Amit S. Shedbale ◽  
Yixiang Gan ◽  
Juhyuk Moon ◽  
Leong H. Poh
Keyword(s):  
Brittle Fracture ◽  
Size Effect ◽  
Fracture Process ◽  
Fracture Process Zone ◽  
Concrete Beams ◽  
Process Zone ◽  
Damage Zone ◽  
Damage Model ◽  
Lattice Models ◽  
Gradient Enhancement

The size effect of a quasi-brittle fracture is associated with the size of fracture process zone relative to the structural characteristic length. In numerical simulations using damage models, the nonlocal enhancement is commonly adopted to regularize the softening response. However, the conventional nonlocal enhancement, both integral and gradient approaches, induces a spurious spreading of damage zone. Since the evolution of fracture process zone cannot be captured well, the conventional nonlocal enhancement cannot predict the size effect phenomenon accurately. In this paper, the localizing gradient enhancement is adopted to avoid the spurious spreading of damage. Considering the three-point bend test of concrete beams, it is demonstrated that the dissipation profiles obtained with the localizing gradient enhancement compare well with those of reference meso-scale lattice models. With the correct damage evolution process, the localizing gradient enhancement is shown to capture the size effect phenomenon accurately for a series of geometrically similar concrete beams, using only a single set of material parameters.

scholarly journals Meso-scale modelling of the size effect on the fracture process zone of concrete

2012 ◽  
Vol 49 (13) ◽  
pp. 1818-1827 ◽  
Author(s):  
Peter Grassl ◽  
David Grégoire ◽  
Laura Rojas Solano ◽  
Gilles Pijaudier-Cabot
Keyword(s):  
Size Effect ◽  
Fracture Process ◽  
Fracture Process Zone ◽  
Process Zone ◽  
Scale Modelling ◽  
Meso Scale
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