Bond Strength of Steel FRC Repairs to Concrete Substrate: Investigation on Adhesion Strength, Friction, and Bond Enhancing Mechanisms

2017 ◽  
pp. 148-156 ◽  
Author(s):  
Giulia Rostagno ◽  
Brian Tingley ◽  
Cristina Zanotti
Keyword(s):  
Bond Strength ◽  
Adhesion Strength

FEM Analysis and Experimental Study for Bond Strength of High-Strength Coating by Wedged Load Test Method

2010 ◽  
Vol 152-153 ◽  
pp. 1058-1061
Author(s):  
Zhou Wei ◽  
Xiao Xia Zhang
Keyword(s):  
Bond Strength ◽  
Adhesion Strength ◽  
Fem Analysis ◽  
High Strength ◽  
Pressure Head ◽  
Optical Microscope ◽  
Complex Stress ◽  
Complex Stress State ◽  
Load Test ◽  
Test Method

A wedged load test method is used to evaluate the adhesion strength of high-strength coatings, which have been processed with various sintering parameters. In this test, for stress concentration at cut tip, cracks are always induced and expanded rapidly cross the interface between coating and substrate. Macro-fracture and SEM image of coating interface of high-strength coating are characterized using optical microscope and scanning electron microscopy (SEM), respectively. In order to evaluate the bonding properties between coating and substrate effectively, corresponding finite element (FE) analysis has been conducted to evaluate the adhesion strength of high-strength coating. And stress distributions cross the interface of high-strength coating are obtained. The stress analysis can help to evaluate the bond strength of high-strength coating. Because of small specimen and contact relationship between wedged pressure head and wedged cuts, complex stress state is affected by many factors resulting from interface, and also by the thickness of coating.

scholarly journals Adhesion of Two New Glass Fiber Post Systems Cemented with Self-Adhesive Resin Cements

2019 ◽  
Vol 7 (3) ◽  
pp. 80 ◽  
Author(s):  
Esin Özlek ◽  
Prasanna Neelakantan ◽  
Jukka Pekka Matinlinna ◽  
Sema Belli ◽  
Mehmet Ugur ◽  
...  
Keyword(s):  
Bond Strength ◽  
Adhesion Strength ◽  
In Vitro Study ◽  
Study Groups ◽  
Fiber Post ◽  
Resin Cements ◽  
Adhesive Resin ◽  
Root Canals ◽  
Group 2

The aim of this in vitro study was to evaluate the adhesion strength of two new fiber post systems (FiberSite™ Post and Cytec™ Blanco Post) cemented with two different adhesive resin cements (Panavia™ SA and Maxcem™ Elite). Root canals of sixty extracted human mandibular premolars were prepared using ProTaper Universal™ rotary files (Dentsply Sirona Endodontics, York, PA, USA). The root canals were irrigated with 5.25% sodium hypochlorite (NaOCl) during instrumentation. After root canal preparation, the canals were irrigated with 2 mL of 17% EDTA (1 min), followed by 2 mL of 5.25% (5 min) NaOCI, and 2 mL saline. The root canals were dried with paper points and divided randomly into two study groups (n = 30) according to the type of post system: Group 1, FiberSite™ Post (MegaDental, Partanna, Italy); and group 2, Cytec™ Blanco Post (Hahnenkratt, Königsbach-Stein, Germany), with one of the two adhesive resin cements: Subgroup A, Panavia™ SA Cement Plus Automix (Kuraray, Osaka, Japan); subgroup B, Maxcem™ Elite (Kerr, Orange, CA, USA). Following thermocycling, the adhesion strength was evaluated using the push-out adhesion (bond) strength test. Fractographic analysis was performed using stereomicroscope. The data were analyzed using two-way analysis of variance (p = 0.05). The adhesion strength values of both the posts were significantly higher when cemented with subgroup B (Maxcem™ Elite). The highest adhesion strength value was demonstrated by group 1B (FiberSite™ post cemented with Maxcem™ Elite cement). The type of post did not have a significant impact on the bond strength values for either cement material.

Investigation of the Influence of Kinematic and Geometric Parameters of the Thermo- Sprayer Location on the Adhesion Strength of Anti-Friction Coating

2020 ◽  
Vol 299 ◽  
pp. 902-907
Author(s):  
Alexey Yu. Rodichev ◽  
Elena N. Gryadynova ◽  
Andrey V. Gorin
Keyword(s):  
Bond Strength ◽  
Adhesion Strength ◽  
Experimental Studies ◽  
Geometric Parameters ◽  
Flame Spraying ◽  
Mathematical Apparatus ◽  
Steel Base ◽  
Gas Flame ◽  
Inertia Forces

The article presents the results of the influence of the kinematic and geometric parameters of the thermos-sprayer location on the adhesion strength of the anti-friction coating. A mathematical apparatus for calculating the inertia forces acting on an anti-friction coating particle is proposed. The results of a number of experimental studies confirming the convergence of theoretical positions are presented. As a result, dependencies have been revealed that make it possible to predict the bond strength of the anti-friction coating with the steel base during gas-flame spraying.

scholarly journals Method of arc activation of the base at increasing the distance plasma spraying

2021 ◽  
pp. 54-58
Author(s):  
A. Ershov ◽  
О. Zelenina
Keyword(s):  
Bond Strength ◽  
Adhesion Strength ◽  
Current Density ◽  
Plasma Coating ◽  
Mechanical Tests ◽  
Atmospheric Conditions ◽  
Reverse Polarity ◽  
Base Surface ◽  
Surface Oxides ◽  
Guaranteed Service

Purpose. To increase the efficiency of the plasma coating by developing a method of ion-arc activation of the base using an activating electrode, which leads to an increase in the adhesion strength of the coating due to the sputtering of surface oxides of the base. Research methods. Experimental and computational, mechanical tests, optical microscopy. The development of the method of ion-arc activation of the part base with an increase in the distance of coating deposition consists in application of an activating electrode located at the surface of the base to create an additional activating arc. The influence of the activating arc on bases for creating an additional activating arc. The influence of the activating arc on the adhesion strength of the coating is determined. The estimation of the current density of the activating arc for the sputtering of surface base oxides is carried out. Results. A method of arc activation of the base surface with an increase in the coating distance is found. It is shown that application of an activating arc of reverse polarity that burns between the additional electrode and the base leads to ion bombardment of the surface by sputtering surface oxides and the creation of microcraters on the base surface. As a result, the bond strength is doubled compared to the bond strength obtained without the use of ion-arc activation of the base. The calculations of the rate of cathodic sputtering of the surface oxides of the base are carried out and the minimum activation current density of the base is determined, which leads to the complete sputtering of a layer of oxides of a given thickness. Scientific novelty. It has been determined that, despite the rapid oxidation of the base under atmospheric conditions, application of the method of ion-arc cleaning of the surface during coating leads to a significant increase in the adhesion strength of the coating to the base. Practical value. The obtained results of increasing the adhesion strength rise the efficiency, the guaranteed service life of the plasma coating on the parts of machines and mechanisms

scholarly journals Parametric Appraisal of Process Parameters for Adhesion of Plasma Sprayed Nanostructured YSZ Coatings Using Taguchi Experimental Design

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Sisir Mantry ◽  
Barada K. Mishra ◽  
Madhusudan Chakraborty
Keyword(s):  
Experimental Design ◽  
Bond Strength ◽  
Adhesion Strength ◽  
Process Parameters ◽  
Particle Temperature ◽  
Taguchi Experimental Design ◽  
Interfacial Toughness ◽  
Ysz Coating ◽  
Particle Velocities ◽  
Plasma Sprayed

This paper presents the application of the Taguchi experimental design in developing nanostructured yittria stabilized zirconia (YSZ) coatings by plasma spraying process. This paper depicts dependence of adhesion strength of as-sprayed nanostructured YSZ coatings on various process parameters, and effect of those process parameters on performance output has been studied using Taguchi’s L16orthogonal array design. Particle velocities prior to impacting the substrate, stand-off-distance, and particle temperature are found to be the most significant parameter affecting the bond strength. To achieve retention of nanostructure, molten state of nanoagglomerates (temperature and velocity) has been monitored using particle diagnostics tool. Maximum adhesion strength of 40.56 MPa has been experimentally found out by selecting optimum levels of selected factors. The enhanced bond strength of nano-YSZ coating may be attributed to higher interfacial toughness due to cracks being interrupted by adherent nanozones.

scholarly journals Differences in tensile adhesion strength between HEMA and nonHEMA-based dentin bonding applied on superficial and deep dentin surfaces

2017 ◽  
Vol 50 (1) ◽  
pp. 14
Author(s):  
Eresha Melati Kusuma Wurdani ◽  
Adioro Soetojo ◽  
Devi Eka Juniarti
Keyword(s):  
Bond Strength ◽  
Adhesion Strength ◽  
Tensile Bond Strength ◽  
Cervical Lesions ◽  
Bonding Agents ◽  
Dentin Bonding ◽  
Bonding Material ◽  
Optimal Function ◽  
Tensile Adhesion ◽  
Composite Restoration

Background: Improvement in dentistry shows some progresses, due to patients awareness on the importance of dental care. Cervical lesion is the most common phenomenon which oftenly found 46.36% in man and 38.13% in woman. Cervical lesions need composite restoration for treatment to stop the process of tissue damage. The process of adhesion of composite restoration material to the structure of the tooth is not easily separated and it needs optimal function in the oral cavity. Application of dentin bonding agents to attach the composite is needed. Selection of HEMA-based bonding material and Hema free-based bonding material which have a different solvent in their composition, as applied to the dentin superficial and deep dentin, affect the results of debonding test. Debonding test is done to measure the adhesion strength of a bonding material. Purpose: The purpose of this study was to analyze differences in tensile bond strength of dentine bonding HEMA-based and HEMA-free based after application in superficial and deep dentine surfaces. Method: The tooth of the bovine was as samples. A superficial dentine sample was taken from 0.5-1 mm of dentino enamel junction and a deep dentine sample was taken from 0.5 mm culmination of pulp horn. Dentine surface area was equal to p x r2 = (3.14 x 22) = 12.56 mm2. Six samples of HEMA-based bonding was applied to the dentine superficial. Six samples of HEMAfree based bonding was applied to the superficial dentine. Six samples of HEMA-based bonding was applied to the deep dentine. Six samples of HEMA-free based bonding was applied to the deep dentine. Tensile strength was measured using an Autograph AG-10TE. Result: There were differences tensile bond strength of dentine bonding HEMA-based and HEMA-free based after the application on superficial (p=0.000) and deep dentine surfaces (p=0.000). Conclusion: There were differences tensile bond strength of dentine bonding HEMA-based and HEMA-free based after the application on superficial and deep dentine surfaces. The use of dentine bonding materials HEMA-free based were better than HEMA-based after application on different dentine depths.

scholarly journals Measurement of Joint Durability between an Aluminum Foil and Basalt Fabrics

2019 ◽  
Vol 27 (6(138)) ◽  
pp. 81-84 ◽  
Author(s):  
Paulina Gilewicz ◽  
Iwona Frydrych ◽  
Iwona Frydrych ◽  
Agnieszka Cichocka ◽  
Justyna Dominiak ◽  
...  
Keyword(s):  
Bond Strength ◽  
Thermal Radiation ◽  
Adhesion Strength ◽  
Protective Clothing ◽  
Adhesive Bonding ◽  
Adhesion Force ◽  
Steel Wire ◽  
Aluminum Foil ◽  
Test Results ◽  
Cut Resistance

The aim of this paper was to determine the adhesion force between an aluminum foil and basalt fabrics. Aluminised basalt fabric can be used as an alternative solution for protective clothing production. So far aluminised glass fabric has been used for this purpose. The lamination of basalt fabrics with aluminum foil does not changed fabric flexibility and can provide better protection against thermal radiation. To check different variants of adhesion, fabrics reinforced by a steel wire were also used (wire diameter 0.1 mm). The steel wire caused an increase in the fabric tear strength as well as in puncture and cut resistance. Two types of glue were chosen to carry out an investigation on the strength of adhesive bonding (Butacoll A+ and Bonatex PU85). The adhesion strength of the laminates was measured according to the PN-88/P-04950 standard. The test results confirmed higher values for weft directions and the phenomenon of asymmetry of the bond strength was found during testing.

Review on Experimental Study on Effect of Corrosion In Reinforced Concrete Fly-Ash Beam

2020 ◽  
pp. 92-96
Author(s):  
Shubham N. Dadgal ◽  
Shrikant Solanke
Keyword(s):  
Fly Ash ◽  
Bond Strength ◽  
Structural Damage ◽  
Pullout Test ◽  
Partial Replacement ◽  
Structural Members ◽  
Accelerated Corrosion ◽  
Resistivity Method ◽  
Electrical Resistivity Method ◽  
Structural Failures

In modern days for structures in coastal areas it has been observed that the premature structural failures are occurs due to corrosion of the reinforcements of the designed structural member. The corrosion causes the structural damage which in turn leads to reduction in the bearing capacity of the concerned structural members. The aim of this study was to study the effect of partial replacement of fly ash to minimize the corrosion effect. Beams were designed and corroded by using artificial method known accelerated corrosion method. The beams were then tested for flexural and bond strength. Also the weight loss of the reinforced bars was been determined using electrical resistivity method. The fly ash will replace by 10% and 15%.The strength will calculate at varying percentage of corrosion at 10% and 15%. Beams will cast at M25 grade concrete. The flexural strength will test by using UTM and the bond strength will calculate using pullout test.

The Correlation of Adhesion Strength with Barrier Structure in Cu Metallization

2003 ◽  
Vol 766 ◽  
Author(s):  
A. Sekiguchi ◽  
J. Koike ◽  
K. Ueoka ◽  
J. Ye ◽  
H. Okamura ◽  
...  
Keyword(s):  
Thin Films ◽  
Adhesion Strength ◽  
Nitrogen Concentration ◽  
Scratch Test ◽  
Barrier Structure ◽  
Barrier Layers ◽  
Cu Metallization ◽  
Microstructure Observation ◽  
Sputter Deposited ◽  
Sulfur Containing

AbstractAdhesion strength in sputter-deposited Cu thin films on various types of barrier layers was investigated by scratch test. The barrier layers were Ta1-xNx with varied nitrogen concentration of 0, 0.2, 0.3, and 0.5. Microstructure observation by TEM indicated that each layer consists of mixed phases of β;-Ta, bcc-TaN0.1, hexagonal-TaN, and fcc-TaN, depending on the nitrogen concentration. A sulfur- containing amorphous phase was also present discontinuously at the Cu/barrier interfaces in all samples. Scratch test showed that delamination occurred at the Cu/barrier interface and that the overall adhesion strength increased with increasing the nitrogen concentration. A good correlation was found between the measured adhesion strength and the composing phases in the barrier layer.

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