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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 22 for “"scratch test"”.
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Determination of Wear in Polymers Using Multiple Scratch Test.
… systematic approach to all polymers and wear test developed are specific to some polymer classes. In this thesis, different classes of polymers are selected and an attempt is made to use multiple scratch test to define wear and to create a universal test procedure that can be employed to most …
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Analysis of the scratch test for cohesive-frictional materials
… analytical solutions for the relations between scratch hardness and strength properties of cohesive-frictional materials of the Mohr-Coulomb and Drucker-Prager type. Based on the lower-bound yield design approach, closed form solutions are derived for frictionless scratch devices, and validated …
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Evaluation of Packaging Film Mechanical Integrity Using a Standardized Scratch Test
… freshness, and overall food safety. Current testing methods, such as tensile or puncture tests, do not necessarily correlate well with field damages that are observed to be scratch-like. The standardized linearly increasing load scratch test is investigated as a new means of evaluating the …
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Development of a portable scratch test device for probing strength, ductility and structural distress in metal materials
… research has demonstrated that instrumented scratch testing is a viable alternative for determining the strength and ductility of metals without the use of destructive methods involving the extraction of tensile testing specimens. Although the scientific basis for scratch testing is well …
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Sliding contact at plastically graded surfaces and applications to surface design
… systematic experiments and simulations of the scratch test. For the case of the linear increase in the yield strength, some of the fundamental questions related to the mechanism of behavior are addressed, and its implications in the design of graded surfaces are discussed. Through derivation of …
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Characterization of mirco/nano mechanical and tribological properties of polymeric coatings deposited on steel
… by analyzing the hardness, elastic modulus, and scratch resistance of each coating. This was accomplished by making indentation and scratch tests on each sample with a nano-indenter and analyzing the results with a Scanning Probe Microscope (SPM). Results of indentation tests show that melamine, …
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Grain-Level Simulation of Dynamic Failure in Ceramic Materials
… of a preliminary study of a dynamic single grit scratch test used to simulate the damage created by a single grinding particle on the machined ceramic component.
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Produção, caracterização e avaliação in vitro de filmes finos de vidro niobo-fosfato por deposição a laser pulsado
… by SEM, EDS, XPS, XRD, XRF, AFM, profilometry, scratch test, focal contact and cell proliferation and differentiation. In XPS analysis, CaNb2(P2O6) and NbOx structures were found. Crystalline phases were not identified on the films, since the glass has an amorphous structure. Together, these …
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Scratch tests : a new way of evaluating the fracture toughness of materials
… of the fracture toughness of materials from scratch tests. Dimensional Analysis highlights two major processes at work during scratch tests: plastic yielding and fracture dissipation. An original set-up of controlled laboratory tests on paraffin wax allows us to identify fracture processes as …
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Design of a Mine Roof Strata Analyis Device
… a device for analyzing rock properties by way of scratching a mine roof borehole was designed and tested in multiple different media with the goal of determining in situ mine roof properties with a nondestructive technique. Tools were developed for measuring extraction force and position of the …
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Fracture characterization of cortical bone at the micrometer and nanometer length scales
… to the scale of the mechanical characterization test, mechanical testing must be designed to engage the different responses of the hierarchical structures within bone. The purpose of the research presented in this thesis is to characterize fracture in cortical bone tissue using novel methods of …
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Development of high temperature/oxidation- resistant PVD coatings for cutting tools using HIPIMS
… subjected to a series of mechanical and thermal testing using pin on disk, microhardness, scratch test, Rockwell indentation, isothermal heat treatment and thermogravimetric analysis. Mechanisms of wear and oxidation process have been proposed based on the evidence given. Through coating …
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Characteristics and modeling of the fracture properties of polymer-silica microparticulate composites via macroscopic scratch tests
… are analyzed using a built-in- house macroscopic scratch test device. The elastic modulus and compressive strength are obtained from a series of compression tests. Scanning electron microscopy is employed as an independent means to corroborate the morphology of the specimens. Several types of …
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Bondcoat developments for thermal barrier coatings
… and standard compositions, using the modified scratch test in conjunction with hot isothermal and cyclic furnace tests. The down selected system was then analysed using a range of techniques including optical and electron microscopy, XRD, WDS and SIMS in order to understand the failure …
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Justification and Merit: the Interpretation and Evaluation of the Concept of Merit in Modern Catholic Theology in Relation to Luther's Doctrine of Justification
… is used in this investigation as a kind of "scratch test" for the validity of this assertion (W. Dantine). Since modern Catholic theology is anxious to reconsider and to reformulate the meaning and statement of the doctrine of merit, the question arises whether these new interpretations and …
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Assessment of fracture properties and rate effects on fracture of materials by micro scratching: application to gas shale
… intrinsic fracture toughness using microscopic scratch tests. The scratch test consists in plowing and cutting with a scratch device the surface of a weaker material and it is relevant in many fields of science and engineering, ranging from thin films and coatings, to wear of metals and …
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Efectos de la Prescripción de un Programa de Ejercicio Físico sobre la Salud, la Aptitud Física y el Estado Emocional en Mujeres Postmenopáusicas
… progresivas durante 12 semanas, y un post-test siguiendo el mismo protocolo inicial. Las pruebas consistieron en tres bloques: salud, aptitud física y estado emocional. Las mediciones de salud se refieren a la valoración del perfil lipídico y la glucosa provenientes de “centros de salud u …
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Engineered surfaces for enhanced performance using thin film coating
… (XRD) and atomic force microscopy (AFM). Scratch tester (CSM) combined with acoustic emission during loading have been utilised in order to compare the coating adhesion. Acoustic emission was used during the indentation process to determine the critical load under which the film begins to …
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Development of PVD coating processes informed by plasma diagnostics.
… High adhesion was achieved as indicated by the scratch test critical load value Lc = 85 N.Finally, at an intermediate stage of the PhD project, an alternative source providing metal ionisation was studied. It was based on a radio frequency (RF) powered coil that was inductively coupled to a …
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Geo-chemo-mechanical modeling of sedimentary rocks: application to unconventional reservoirs and geological CO2 sequestration
… techniques, i.e. analytical nanoindentation, scratch testing, environmental scanning electron microscopy, to provide the basis for assessment of microstructure and material invariant properties. Nanoindentation experiments and analysis tools are designed to probe and infer the elastic and …
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