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 “"CRACK ARREST"”.
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Roles of grain boundaries in cleavage cracking and thermal crack arrest experiments in iron-silicon alloy
… resistance to the propagation of cleavage cracks that affects the fracture toughness and can modulate the ductile-to-brittle transition temperature of fracture downward. This behavior has been studied in this thesis in detail. In grain-boundary toughness measurement experiments in …
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Propagation of delamination in layered anisotropic cylinders
… it as a thin shell, with an axisymmetric crack in the adhesive layer between two laminae, and an axisymmetric loading acting as the driving force. The axial and shear strains of the reference plane are considered negligible compared to its circumferential strain. The cylinder, after …
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ΦΑΙΝΟΜΕΝΑ ΑΣΤΑΘΕΙΑΣ ΤΗΣ ΔΙΕΥΘΥΝΣΕΩΣ ΤΑΧΕΩΣ ΚΙΝΟΥΜΕΝΩΝ ΡΩΓΜΩΝ
… PRESENT DISSERTATION THE PHENOMENA OF DYNAMIC CRACK INSTABILITY ARE STUDIED FOR FAST RUNNING CRACKS. THESE PHENOMENA ARE: DYNAMIC BRANCHING, DYNAMIC CURVING, DYNAMIC KINKING AND CRACK ARREST. A SERIES OF EXPERIMENTS PROVES THAT THE EXISTING "YOTTE MODE" FOR APPLYING MACROSCOPIC FRACTURE …
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Statistical modelling of the transition toughness properties of low alloy pressure vessel steels
… of the current best thinking on the modelling of crack arrest toughness is also considered. It has been established in this work that a highly accurate representation of a large toughness database can be achieved by the inclusion of constraint loss effects and the interaction between initiation …
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ΕΛΕΓΧΟΜΕΝΗ ΔΙΑΔΟΣΗ ΡΩΓΜΩΝ ΛΟΓΩ ΚΟΠΩΣΗΣ ΣΕ ΣΥΝΘΗΚΕΣ ΣΥΝΤΟΝΙΣΜΟΥ
FATIGUE CRACK PROPAGATION IN VARIOUS RESONATING MEMBERS IS STUDIED. THE CRACK PROPAGATION RATE IS RELATED TO THE STRESS INTENSITY FACTOR OR THE STRAIN ENERGY DENSITY FACTOR DEPENDING ON THE KIND OF THE APPLIED LOADING. FOR THIS PURPOSE, THE WELL KNOWN EQUATIONS OF PARIS AND SIH ARE USED. THE DEPTH …
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Hierarchical and size dependent mechanical properties of silica and silicon nanostructures inspired by diatom algae
… mechanisms occur, such as shearing and crack arrest, toughness is optimally enhanced. This occurs, for example, when structures encompass two nanoscale levels of hierarchy: an array of thin walled foil silica structures, and a hierarchical arrangement of foil elements into a porous …
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Critical literature review on concrete crack repairs
… on an in-depth review of literature on concrete crack repairs. Deterioration of concrete affects both the aesthetics and the integrity of structures. As a result, there is need to repair such defects in order to restore the aesthetics and the integrity of concrete structures. This research …
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Effect of residual stress on the life prediction of dry storage canisters for used nuclear fuel
… chloride ions that can cause stress corrosion cracking (SCC). Residual stresses from the welding process provide the tensile stress for crack initiation and propagation which could eventually compromise canister integrity, allowing the release of radioactive material to the environment. If it …
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Fracture Resistance of Coated Polycrystalline Silicon Wafers
… utilising the ball-on-ring configuration. The crack propagation and damage mechanism were frequently examined using optical microscopy, SEM, and laser-confocal microscopy. Evidence was found that uncoated large-grained polycrystalline silicon wafers, although considered inert and …
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Effective mechanical Properties of material models with random heterogeneities
… the random effects of fracture propagation and crack arrest by fitting regression models to simulation data and combine the regressions with the distributions at fracture initiation. Through parametric analysis, we gain insight into the strengthening/weakening roles of the Euclidean dimension, …
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Bonded structures for enhanced damage tolerant pressurized fuselages
… Selective Reinforcements can guarantee slow crack propagation, crack arrest and large damage capability. To optimize the design exploiting the benefit of bonded structures incorporating selective reinforcement requires reliable analysis tools. The effect of bonded doublers / selective …