Nonlocal Microplane Model for Fracture, Damage, and Size Effect in Structures

1990 ◽  
Vol 116 (11) ◽  
pp. 2485-2505 ◽  
Author(s):  
Zdeněk P. Baznt ◽  
Joško Ožbolt
Keyword(s):  
Size Effect ◽  
Microplane Model ◽  
Fracture Damage

Size Effect of Squat Shear Walls Extrapolated by Microplane Model M7

2019 ◽  
Vol 116 (3) ◽  
Author(s):  
Mohammad Rasoolinejad ◽  
Zdeněk P. Bažant
Keyword(s):  
Size Effect ◽  
Shear Walls ◽  
Microplane Model

Size effect on the shear capacity of headed studs

2020 ◽  
pp. 136943322096903
Author(s):  
Ahmet Abdullah Dönmez
Keyword(s):  
Size Effect ◽  
Failure Modes ◽  
Three Dimensional ◽  
High Strength ◽  
Shear Capacity ◽  
Microplane Model ◽  
Effect Factor ◽  
Shear Connectors ◽  
Concrete Damage ◽  
Damage Constitutive Model

This study aimed to reveal the existence of size effect on the shear connectors used in the steel-concrete composite beams and slabs. The experimental study contains the monotonic tests of nine pushout specimens with the headed studs. Three-dimensional scaling was used for geometrically similar specimens of three sizes. High strength concrete slabs were used on both sides of the steel I-beam. The failure modes of the specimens include both concrete crushing and stud yielding. Finite element (FE) verification of the specimens was conducted using a realistic concrete damage constitutive model, Microplane Model M7. It is shown that there may be a non-negligible size effect based on the fracture patterns of the composite member. Bažant’s size effect law (SEL) can fit the size effect behavior of the shear connectors. The design equations which do not include a size effect term have high correction factors that overestimate the tested specimens. A new design equation can be drawn using the size effect factor for strength reduction of shear connectors.

Realization of ductile regime machining in micro-milling SiCp/Al composites and selection of cutting parameters

2018 ◽  
Vol 233 (12) ◽  
pp. 4336-4347 ◽  
Author(s):  
Junwei Liu ◽  
Kai Cheng ◽  
Hui Ding ◽  
Shijin Chen ◽  
Liang Zhao
Keyword(s):  
Size Effect ◽  
Surface Quality ◽  
End Milling ◽  
Chip Thickness ◽  
Cutting Parameters ◽  
Micro Milling ◽  
Machined Surface ◽  
Side Milling ◽  
Ductile Regime Machining ◽  
Fracture Damage

SiCp/Al composites are widely used owing to their outstanding performance. However, due to the existence of brittle SiC, surface defects caused by particle fracture damage the surface quality severely. Meanwhile, due to small cutting parameters during the micro-milling process, especially the undeformed chip thickness, which is mainly determined by the feed per tooth, the size effect of matrix also damages the surface quality. In this study, a method by realizing the ductile regime machining of the particle and diverting away the defects of particles and matrix is proposed to select the cutting parameters and improve the surface quality in micro-milling SiCp/Al composites. Suitable range of values of the feed per tooth for side milling and end milling are obtained by this method and validated by micro-experiments. The results show that the size effect of Al and removal ways of the SiC particles affect the machined surface simultaneously. By using suitable feed per tooth, weak size effect of Al and most of the particles’ ductile regime removing can be realized, leading to the generation of the best surface. Additionally, the machining effects of this method are more prominent in end milling than in side milling.

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