Bond strength between two layers of hot mix asphalt (HMA) pavement is a major issue. Poor bond may be attributed to the premature fatigue failure, top down cracking, slippage cracks in the surface layer, and also difficulty in compaction due to insufficient shear strength. A thin and uniform application of emulsified asphalt or tack coat ensures a good bond between the existing surface and the ...

Multilayer thermal barrier coatings (TBCs) deposited on superalloy turbine blades provide protection from combustion temperatures in excess of 1500 1C. One of the dominant failure modes comprises cracking from undulation growth, or rumpling, of the highly compressed oxide layer that grows between the ceramic top coat and the intermetallic bond coat. In this paper, a mechanistic model providing ...

An experimental investigation was conducted to find the effect of spraying method of coating of Thermal Barrier Coatings (TBCs) on their oxidation behaviour and resistance to various thermal loading. Isothermal and thermal shock tests were performed in order to study oxidation behaviour of air plasma sprayed Bond Coat (BC) and assess its effect on TBCs lifetime under the stated loadings. Specim...

Objectives: Ceramics have advantages such as optimal esthetics and biocompatibility. However, in the oral environment, they are subjected to high levels of stress due to masticatory forces, saliva, thermal changes and alterations of pH, which increase their risk of fracture. Since replacement of these restorations is costly and time-consuming, composite resin is often used for intraoral repair ...

objective: ceramics have advantages such as optimal esthetics and biocompatibility. however, in the oral environment, they are subjected to high levels of stress due to masticatory forces, saliva, thermal changes and alterations of ph, which increase their risk of fracture. since replacement of these restorations is costly and time-consuming, composite resin is often used for intraoral repair o...

Undulation instabilities in a tri-layer system subject to variations of temperature are studied for the purpose of revealing a mechanism leading to the failure of thermal barrier systems. A pre-compressed oxide film with a small initial non-planarity is attached to a metal bond coat layer that is, in turn, attached to a thick superalloy substrate. The oxide film and the superalloy substrate are...

Objective: The purpose of this study was to evaluate the microtensile bond strength (μ TBS) of four total-etch adhesives [Excite (EB), Prime & Bond NT (PBNT), Single Bond (SB), and One Coat Bond (OCB)] by comparing them to five self-etching adhesives (Clearfil SE Bond (CSEB), Xeno III (X III), Prompt L-Pop (PLP), AQ Bond (AQB), and Tyrian/One Step plus (TOSP)] at different dentinal areas. In ad...

Recent experimental measurements have revealed that the amplitudes of undulations in the thermally grown oxide (TGO) formed on a bond coat subject to cyclic thermal histories depend on the bond coat thickness, hbc, and exhibit a maximumwhen hbc 100 lm. The existing rumpling model does not predict the maximum. To account for this effect, the model has been extended to include finite substrate th...

Thermal barrier coating (TBC) systems are known to be extremely sensitive the applied thermo-mechanical loading in terms of both microstructure evolution and subsequent damage, leading final failure by ceramic top-coat layer spallation. The analysis relationship between mechanical behavior is limited scatter experimental results. Based on a typical TBC system for columnar top-coat, this study f...