Global ETD Search
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 32 for “"Interfacial strength"”.
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Interfacial strength development in thermoplastic resins and fiber-reinforced thermoplastic composites
… that could be used to characterize autohesive strength development in amorphous thermoplastic resins and fiber-reinforced thermoplastic prepregs. All tests were performed using polysulfone P1700 thermoplastic resin and AS4/P1700 graphite-polysulfone prepreg. Two test methods were examined to …
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Evaluation of Osseointegration Between Two Different Modalities of Hydroxyapatite Implant Surface Coatings: Plasma Sprayed HA Coated Implants and Electrophoresis Deposited Nano HA Coated Implants
… The quantity of osseointegration was inferred by interfacial strength and percent tissue-contact length.Materials and Methods: Thirty-six cylindrical implants (18 PS and 18 EPD) were placed into dog mandibles. Nine implants from each group were evaluated with pull out testing and histological …
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Development of an enhanced microstructure–level machining model for carbon nanotube reinforced polymer composites using cohesive zone interface
… and the polymer phase, thereby assuming perfect interfacial bonding. However, subsequent experimental investigations revealed that the failure mechanism during machining is primarily governed by the CNT–polymer interface. Since the strength of the CNT–polymer interface is critical to the load …
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Structural and residual strength analysis of metal-to-metal adhesively bonded joints.
… methodology to assess 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 …
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An investigation of the interfacial characteristics of nitinol fibers in a thermoset composite
… many material properties, including the interfacial shear strength between the embedded sensor or actuator and the matrix must be thoroughly understood.. Investigations were performed in order to examine the effects of different variables on the interfacial characteristics between a …
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MnO2 Nanoscale Interface Modification
… modification and carbon fiber is crucial to the interfacial strength of the resulting hybrid composite interfaces. This adhesion strength can be studied using nanoscratch to find the force needed to cause delamination of the nano-modification. This work will report on the nanoscratch tests on …
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A Mechanical and Histological Study of Functionally Graded Hydroxyapatite Implant Coatings
… two for histological evaluation. To evaluate the interfacial strength of the implants at the bone-implant interface, push-out test were performed. The evaluation of the bone response to implant was done using histological analysis.<br /><br />At three weeks following implantation, there was no …
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Thin -Film Adhesion Measurement by Laser -Induced Stress Waves
… conditions is observed and the mixed-mode interfacial strength is measured and compared with the tensile case.
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Investigation of a heirarchical collagen scaffold/3D printed lattice structure designed for use in total knee replacements
… printing parameters and the ultimate tensile strength (UTS) and modulus. The rasters of dumbbell specimens were aligned perpendicular to the applied load, such that the inter-raster bonds were strained during testing. Increased print speed and raster width were associated with reduced porosity …
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Tensile Fracture Mechanisms of Ferritic/martensitic Structural Materials
… association between critical stress and critical interfacial strength, but also offer a new method to determine the true strain/stress behavior during deformation. This method is called the Universal Micro-structural Geometry-corrected Model (UMGM) in this dissertation. Due to the development of …
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Synthesis and characterization of graphene-palladium thin film composites for nano-gilding
… properties of synthesized graphene and a strong interfacial strength between them. To the end of synthesizing useful graphene-based composites, chemical vapor deposition (CVD) growth of graphene on thin palladium leaves is studied for the potential of nano-gilding based coating of surfaces for …
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Computational modelling of interfacial failure behaviours in polymer–metal joints
… developing a better strategy to achieve enhanced interfacial properties in polymer–metal/metal oxide joints using computational techniques such as density functional theory (DFT), molecular dynamics (MD), and dissipative particle dynamics (DPD) methods. Our calculations provide support to a …
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Metal/polymer interactions in polyimide adhesives
… sulfur in the polyimide backbone on bond strength. X-ray photoelecton spectroscopy (XPS) and reflectance infrared spectroscopy indicated that certain metals catalyze the oxidation of the thioether sulfur. It was believed that this oxidation could lead to direct metal-oxygen-sulfur bonds …
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ASPECTS OF RECYCLING OF CARBON FIBRE REINFORCED POLYETHERETHERKETONE (CF/PEEK)
… alignment of fibres, the full theoretical strength of the composite was not realised. This was to be expected, as the material used was recycled. The lower mechanical properties were probably due to the degradation in the interfacial strength between the fibres and the matrix. By isolating …
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Molecular tailoring of interfaces for thin film on substrate systems
… undergo thermo-mechanical cycling, which induces interfacial delaminations leading to failure of the overall device. The ability to tailor interfacial properties at the molecular level provides a mechanism to improve thin film adhesion, reliability and performance. This dissertation presents the …
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Autohesion model for thermoplastic composites
… autohesion model. Heat transfer analyses and the interfacial strength development analyses were conducted using the non-isothermal autohesion model on a polysulfone (Udel P1700) compact tension specimen, a 64-ply graphic (Thomel T300)/P1700 unidirectional composite, and a 192-ply graphite …
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The performance of nitinol shape memory alloy actuators embedded in thermoplastic composite material systems
… performance is presented. A study of the interfacial strength between the actuators and APC-2 thermoplastic composite is also reported. The nitinol actuators were exposed to high temperature (400°C) composite processing cycles. Critical parameters of the processing cycles were varied to …
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Interfacial Thermomechanical Behavior of Hybrid Carbon Fibers
… weak epoxy to the stronger fiber. Improving the strength of the interface reduces the risk of failure at the interface and improves the load transfer to the fiber. In this study, two types of nano-species ZnO nanowires and nickel-based metal organic frameworks were grown on carbon fibers to …
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Analysis of matrix damage in single fiber composites
… interface w ill debond depending on the interfacial strength. This damage of the fiber or the matrix would eventually lead to the ultimate failure of the composite. Hence it is essential to analyze the stresses and energies associated with an unidirectional composite containing matrix …
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Mechanical behavior of nanostructured metallic films under compressive and shear loads
… compressive and shear stiffnesses and bonding strengths of nanostructured thin films consisting of arrays of Cu and Ag helical springs. Rectangular areas of films were loaded in uniform compression and shear and the film properties were obtained through the load versus displacement response. …
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