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 11 of 11 for “"Micro-crack"”.
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Influence of Low Temperature Degradation on Microstructural Integrity of Zirconia Dental Implants
… and its influence on phase stability and micro-structural integrity in terms of increased micro-crack formation. In the case of dental implants, this could possibly result in delamination and interference with bone to implant contact and eventually lead to loss of integration and failure. …
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Computational Modeling and Impact Analysis of Textile Composite Structutres
… woven composite structures weakened by cracks and subjected to static-, impact- and ballistic-type loads. As more complicated modeling about textile composite structures is introduced, some of homogenization schemes, geometrical modeling and crack propagations become more difficult …
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Quantitative understanding of the role of grain boundaries in polycrystalline deformation via multiscale digital image correlation
… loading conditions. In addition, the underlying microstructure was characterized with similar spatial resolution using electron backscatter diffraction (EBSD). The experimental results were utilized to investigate the localization of plastic strains in the vicinity of grain boundaries (GBs). …
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Experimental and numerical analysis of abrasive waterjet drilling of brittle materials
… consist of a combination of bending, shearing, micromachining, and erosion. The micro-mechanisms associated with AWJ drilling are micro-fracture of fibers and matrix, delamination, and fragmentation of fiber bundles. The results from the numerical experiments demonstrated that the shear applied …
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Cycling studies of micro-tubular solid oxide fuel cells
… for example during start-up and shutdown, where cracking can occur. The objective of this project is to understand these mechanisms of cyclic degradation for micro-tubular SOFC, then to set-up experiments to measure the degradation in terms of the drop in electrochemical performance and …
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Anwendungsgrenzen von modernen Nickelbasis-Superlegierungen in effusionsgekühlten Bauteilen zukünftiger Gasturbinen
… were significantly influenced by their different microstructures. Comparing the single crystal materials, CMSX-4 exhibited in strain rate controlled tensile tests (1000°C) higher strength properties than SX CM186LC. The heterogeneity of the microstructure development of SX CM186LC favoured crack …
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Structure, strength and defect characterisation of cement based materials.
… release of the residual stresses as the macro-crack propagates. While circumstantial evidence of the residual stresses exist (e.g. micro-crack formation leading to permanent deformation in flexural tests), it is very difficult to observe the mechanism in action. The quantitative estimate of the …
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Multiscale Modeling of Fatigue and Fracture in Polycrystalline Metals, 3D Printed Metals, and Bio-inspired Materials
… area at the wheel-rail interface promotes micro-crack initiation and propagation near the surface of the rail. 2D and 3D microstructural-based computational frameworks are developed for studying the rolling contact fatigue in rail materials. The method can predict RCF life and simulate …
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Effect of concrete heterogeneity on FRP-to-concrete bond behaviour
… objectivity cannot be achieved even when the crack band model is adopted. A mesh and fracture pattern dependent model has been proposed, through which mesh objectivity can be successfully achieved under macroscale and mesoscale FE schemes.<br/>Following the development of the above mesoscale …
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Experimental investigation of damage evolution during strain burst in brittle rocks for deep mines
… and temperature. In order to quantify the micro-crack density and reveal the micro-fracture characteristics of the brittle rocks exposed to various temperatures, scanning electron microscopy (SEM) analysis was also conducted. This is highly relevant to link the excess strain energy and the …
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Enhanced dissipation for improved mechanical performance: a journey from concrete structures to functional materials [Miglioramento della dissipazione per prestazioni meccaniche ottimizzate: un percorso dalle strutture in calcestruzzo ai materiali funzionali]
… reali è spesso governata da meccanismi microscopici, come lo scorrimento di microfessure, il rilassamento viscoelastico, le instabilità di flusso multifase o gli effetti elettromeccanici accoppiati, assenti nei modelli continui classici. Questa tesi sviluppa una metodologia di …