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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Bond failure"”.
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Structural and residual strength analysis of metal-to-metal adhesively bonded joints.
… the residual strength of defective adhesive bonds. This incorporates defect detection in adhesive bonds and quantification of the effect of these defects on the adhesive bond failure. Finite element analysis (FEA) was used to simulate the failure behaviour of adhesive bonds. Acoustic emission …
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Evaluation of Tensile Bond Strength of Glass Ionomer Cements for Orthodontic Bonding
… composite resins when used for orthodontic bonding. These include chemical bonding to enamel, fluoride release, and ease of removal from enamel upon debonding. This study evaluated the tensile bond strengths of three Type I (luting) and three Type II (restorative) glass ionomer cements when …
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Mechanical behaviour of adhesive anchors installed in concrete
… in concrete. They are the mechanisms of failure, the relationship between applied pull-out'loadand slip of the anchor and the stresses and strains in each of the three components (steel-resin'-concrete). The study is-primarily-experimental--but theoretical and finite element analyses are …
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Load transfer mechanism of fully grouted cable bolts.
… industry for more than fifty years. However, failure of cable bolting systems still occurs in mine sites, as a result of insufficient load transfer between the rock mass and the cable bolt. Numerous research studies have been conducted to understand the load transfer mechanism of cable bolts …
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Bond Strength and Development Length of Sand-Coated GFRP Bars Spaced and Bundled in Normal Strength and Ultra-High-Performance Fibre-Reinforced Concrete
This thesis experimentally examines the bond strength and development length (Ld) of three sand- coated glass fibre-reinforced polymer (GFRP) bar sizes (#4, 5 and 8) embedded into ultra-high- performance fibre-reinforced concrete (UHPFRC) with 2% steel fibres. It also examines the Ld of sand-coated …
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Use of a Synthetic Substrate for Orthodontic Bond Strength Testing
In vitro bond strength studies are of great importance and interest since they allow the prediction of clinical success of orthodontic adhesives. There are many studies that have investigated bond strength values of bonding systems. However, due to the variation in the materials and methods …
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Tensile Bond Strength of Light-Activated Composite for Bonding Metal and Ceramic Brackets
… cleanup. This study compared in vitro tensile bond strength and site of failure of a new light-activated adhesive and a commonly used two-paste adhesive for bonding ceramic and metal brackets. Manufacturer recommended light-activation times were evaluated using hardness as an indicator of cure. …
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Examination of flexural crack width prediction in concrete: comparison of analytical and numerical models
… confidence with which durability can be ensured. Bond failure between concrete and the embedded reinforcing steel exposes the steel surface within a crack path. This relative slip results from differential tensile strain between concrete and steel that allows harmful ions to reach and then react …
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Effect of refrigerant spray on orthodontic composite resin-bracket debond strength and associated adhesive remnant index
… speed on orthodontic composite resin shear debond strength and Adhesive Remnant Index (ARI) after bond failure. Orthodontic brackets were bonded to forty paired extracted mandibular third molars. Pairs were divided into experimental and control groups, with and without refrigerant spray prior …
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Bond between reinforcing bars and concrete under impact loading
The bond between reinforcing bars and concrete under impact loading was studied for plain, polypropylene fibre reinforced, and steel fibre reinforced concretes. The experimental program included setting up an impact test system, in which an impact load with considerable energy could be generated, …
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Predicting adhesive failure initiation of an epoxy bond for electronic packaging survivability
… it is important for an engineer to have a failure criterion that can be used for failure predictions and redesign of electronic assemblies. Data from epoxy bond failure in mock electronic part assemblies were correlated to finite element analyses to predict adhesive failure initiation. …
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The Comparison of the Tensile, Shear-Peel, and Torque Orthodontic Bond Strength Test Methods Performed on a Resin and Two Glass Ionomer Cements
… to compare the tensile, shear-peel, and torque bond strength testing methods using a commercially available resin (R), light-cured (LC), and chemically cured (CC) glass ionomer. Sixty-three bovine incisors were randomly divided into three groups. Stainless steel incisor brackets were bonded to …
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CFRP Prestressed Concrete Exposed to Moisture
… matrix-dominated changes to the CFRP-concrete bond when the CFRP rods are cast into concrete as prestressed reinforcement. Experiments were conducted to measure the transverse swelling and moisture uptake rates of stressed and unstressed CFRP rods immersed in water and concrete pore solution …
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Importance of Pumice Prophylaxis for Orthodontic Bonding with Self-etch Primer: An in vivo Study
… (SEP) have recently simplified the orthodontic bonding process and questions have arisen regarding their reliability and efficiency. The goal of this study was to assess the importance of a pumice prophylaxis prior to bonding with SEP (Transbond Plus, 3M Unitek, Monrovia, CA) in reducing bond …
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Bonding Properties of Newly Erupted and Mature Human Premolars
… treatment. Since orthodontic attachments are bonded directly to the etched enamel using composite resin, post-eruptive enamel maturation may affect the bonding process. The purpose of this study was to determine whether there were differences in bond strength between mature and newly erupted …
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A Quantifiable Model for Local Bond Stress-Slip Relationship under Generalized Excitations
An analytical model for local bond stress-slip relationship proposed in this paper was developed because of the need for a reliable bond stress-slip model to be used in predicting the bond behavior between steel bars and concrete in the well-confined zones of concrete structures under generalized …
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Investigation of Transfer Length, Development Length, Flexural Strength and Prestress Loss Trend in Fully Bonded High Strength Lightweight Prestressed Girders
… of eight strands in the girders showed general bond failure nevertheless, the tested girders exceeded their theoretical flexural capacity by 24 to 30 percent. A third composite girder was cast of a high strength normal weight concrete (HSNWC) Type II girder, and topped with a 48" x 8" normal …
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Topographic and Surface Chemical Aspects of the Adhesion of Structural Epoxy Resins to Phosphorus Oxo Acid Treated Aluminum Adherends
Structural adhesive bonding offers several advantages over other types of joining. These include improved stress distribution and increased design flexibility. Adhesive bonding is important in aerospace, automotive, and packaging applications. However, the full potential of the technology has not …
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Evaluation of the Tensile Bond Strength of Orthodontic Bracket Bases Using Glass Ionomer Cement as an Adhesive
The search for an orthodontic bonding adhesive that has chemical adhesion to enamel and releases fluoride into the oral environment has led to experimentation with glass ionomer cements. This study compared the tensile bond strength of eight different orthodontic bracket base designs in vitro and …
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Concrete surface coatings and the influence of substrate moisture condition on bond strength
… when they are manufactured, however, premature bond failure due to poor substrate surface preparation and various substrate moisture conditions still seem to occur after coating application. This investigation will give insight into the effects a sound, clean and profiled concrete substrate that …
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