Role of Internal Damage Mechanisms in Controlling Bond-Slip Behavior in Pullout Tests in Concrete

2019 ◽  
Vol 31 (12) ◽  
pp. 04019284 ◽  
Author(s):  
Orit Leibovich ◽  
David Z. Yankelevsky ◽  
Avraham N. Dancygier
Keyword(s):  
Internal Damage ◽  
Damage Mechanisms ◽  
Bond Slip ◽  
Pullout Tests

scholarly journals Bond-Slip Mechanisms of Hooked-End Steel Fibers in Self-Compacting Concrete

2008 ◽  
Vol 587-588 ◽  
pp. 877-881 ◽  
Author(s):  
Vítor M.C.F. Cunha ◽  
Joaquim Barros ◽  
José Sena-Cruz
Keyword(s):  
Analytical Model ◽  
Steel Fibers ◽  
Experimental Results ◽  
Self Compacting Concrete ◽  
Fiber Pullout ◽  
Bond Slip ◽  
Pullout Tests ◽  
Embedment Length ◽  
Frictional Bond

The experimental results of hooked-end steel fibers pullout tests on a self-compacting concrete medium are presented and discussed in this work. The influence of fiber embedment length on the fiber pullout behavior is studied. The role of the end hook of the fiber on the overall pullout behavior is also investigated by carrying out tests with fibers without its end hook, in order to separate the contribution of the frictional bond component from those derived from the mechanisms provided by the end hook of the fiber. Finally, the experimental bond-slip relationships are modeled by an analytical model.

scholarly journals Role of defects in fatigue damage mechanisms of cast polycrystalline superalloy MAR-M 247

2014 ◽  
Vol 12 ◽  
pp. 03005
Author(s):  
Miroslav Šmíd ◽  
Stanislava Fintová ◽  
Ludvík Kunz ◽  
Pavel Hutař
Keyword(s):  
Fatigue Damage ◽  
Damage Mechanisms

scholarly journals Role of Microstructure in Susceptibility to Hydrogen Embrittlement of X70 Microalloyed Steel

2014 ◽  
Vol 783-786 ◽  
pp. 961-966
Author(s):  
Daniel Hejazi ◽  
Ahmed A. Saleh ◽  
Ayesha Haq ◽  
Druce Dunne ◽  
Andrzej Calka ◽  
...  
Keyword(s):  
Microalloyed Steel ◽  
Hydrogen Uptake ◽  
Internal Damage ◽  
Steel Microstructure ◽  
Back Scattering ◽  
Hydrogen Induced Cracking ◽  
Steel Processing ◽  
Bainite Microstructure ◽  
Prior Processing

The effect of phases and steel processing on hydrogen uptake (diffusible and residual), surface and internal damage were evaluated using optical and scanning electron microscopy. The results have shown the fastest formation of blisters in ferrite-pearlite microstructure of strip, followed by equaixed ferrite-pearlite microstructure in normalised condition, then by ferrite-bainite microstructure. No blistering was observed in heat affected zone samples for up to 24 hrs charging. Analysis of hydrogen-induced cracking using electron back scattering diffraction has revealed that crack propagation has predominantly intragranular character without a clear preference on {001}, {110}, {112} and {123} planes and is independent of the steel microstructure and prior processing.

The role of sea salts in the occurrence of different damage mechanisms and decay patterns on brick masonry

2004 ◽  
Vol 18 (2) ◽  
pp. 119-124 ◽  
Author(s):  
Barbara Lubelli ◽  
Rob P.J. van Hees ◽  
Caspar J.W.P. Groot
Keyword(s):  
Brick Masonry ◽  
Sea Salts ◽  
Damage Mechanisms

scholarly journals Low-Cycle Fatigue of FRP Strips Glued to a Quasi-Brittle Material

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7753
Author(s):  
Enzo Martinelli ◽  
Antonio Caggiano
Keyword(s):  
Bond Length ◽  
Low Cycle Fatigue ◽  
Cyclic Behavior ◽  
Pure Mode ◽  
Geometric Quantity ◽  
Bond Slip ◽  
Frp Strips ◽  
Interface Bond ◽  
Fracture Processes

This paper aims at further advancing the knowledge about the cyclic behavior of FRP strips glued to quasi-brittle materials, such as concrete. The results presented herein derive from a numerical model based on concepts of based on fracture mechanics and already presented and validated by the authors in previous works. Particularly, it assumes that fracture processes leading to debonding develop in pure mode II, as is widely accepted in the literature. Starting from this assumption (and having clear both its advantages acnd shortcomings), the results of a parametric analysis are presented with the aim of investigating the role of both the mechanical properties of the interface bond–slip law and a relevant geometric quantity such as the bond length. The obtained results show the influence of the interface bond–slip law and FRP bond length on the resulting cyclic response of the FRP-to-concrete joint, the latter characterized in terms of S-N curves generally adopted in the theory of fatigue. Far from deriving a fully defined correlation among those parameters, the results indicate general trends that can be helpful to drive further investigation, both experimental and numerical in nature.

Influence of Nanoclay on Concrete Subjected to Freeze-Thaw Cycles and Bond Behavior between Rebar and Concrete

2016 ◽  
Vol 711 ◽  
pp. 256-262 ◽  
Author(s):  
Ying Fang Fan ◽  
Shi Yi Zhang ◽  
Surendra P. Shah
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Portland Cement Concrete ◽  
Freezing And Thawing ◽  
Bond Slip ◽  
Bond Behavior ◽  
Freeze Thaw ◽  
Pullout Tests ◽  
Cement Based Materials ◽  
Before And After

This paper explores the effects of nanokaolinite clay (NKC) on the behavior of cement-based materials concrete. The resistance of NKC modified cement-based materials to freezing-thaw cycles and the corrosion processes of rebar embedded in the concrete were investigated. Ordinary Portland cement was partially substituted with NKC in ratios of 0%, 1%, 3%, and 5% by weight. The Rapid Freeze-Thaw Cabinet was used to measure the resistance of ordinary Portland cement concrete and concrete with clay to deterioration caused by repeated cycles of freezing and thawing, compressive strength were measured at regular intervals. The corrosion conditions of the rebar embedded in the concrete were studied by an electrochemical accelerated penetration system, pullout tests were performed to assess the bond properties including bond-slip curve, ultimate bond strength between concrete and rebar before and after corrosion. It is revealed that the introduction of NKC improves the freeze-thaw resistivity values and bond behavior in the concrete specimens compared to the control concrete; the corrosion of the rebar embedded in the concrete is impeded efficiently.

scholarly journals Uniaxial deformation of open-cell aluminum foam: the role of internal damage

2004 ◽  
Vol 52 (10) ◽  
pp. 2895-2902 ◽  
Author(s):  
C. San Marchi ◽  
J.-F. Despois ◽  
A. Mortensen
Keyword(s):  
Aluminum Foam ◽  
Uniaxial Deformation ◽  
Internal Damage ◽  
Open Cell
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