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 163 for “"Failure mechanism"”.
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Analysis of the failure mechanism of shipboard structural members exposed to fire
Thesis (Ocean E)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1984.
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Modeling of Acoustic Emission Failure Mechanism Data from a Unidirectional Fiberglass/Epoxy Tensile Test Specimen
… network was used to sort the data into five failure mechanism clusters. The resulting frequency histograms of the sorted data were then mathematically modeled herein using the three types of Johnson distributions: bounded, lognormal, and unbounded. These provided a reasonably good fit for all …
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Diffusional lithium trapping as a failure mechanism of aluminum foil anodes in lithium-ion batteries
Aluminum foils are an appealing anode for lithium-ion batteries due to their high capacity and low-cost, but their viability has been limited due to poor cyclability arising from pulverization and solid-electrolyte interphase growth. We show in this thesis that significant capacity degradation of …
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Numerical Modeling for Increased Understanding of the Behavior and Performance of Coal Mine Stoppings
… roof to floor convergence. For this reason, the failure mechanism of stoppings under vertical loading has not been fully understood. Numerical models were used in combination with physical testing to study the failure mechanisms of concrete block stoppings. Initially, the behavior of a single …
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Air Plasma Sprayed Thermal Barrier Coatings: Experiments and Finite Element Analysis
… research was to examine the primary in-service failure mechanism of an air plasma sprayed thermal barrier coating commonly used in combustor applications, and to use that failure mechanism as a basis in developing a life prediction strategy. The research consisted of an experimental phase, in …
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Low Proof Load Prediction of Ultimate Strengths of Fiberglass/Epoxy I-Beams Using Acoustic Emission
… were collected from the onset of loading to failure. After acquisition, the AE data from each test were filtered to include only data collected up to 50% of the theoretical ultimate load for further analysis.</p> <p>A Kohonen self-organizing map was utilized to separate each individual data …
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Response of suction caissons in soft clay under vertical and horizontal loading for tidal energy converter applications
… in laponite allowed for visualization of the failure mechanism of clay during vertical loading of suction caissons. These visualizations allowed for a comparison of the mobilized failure mechanism to the failure mechanism assumed in the design of suction caissons.
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Techniques for Reliability and Robustness in Integrated Electronic and Photonic Systems
… from lifetime datasets where multiple underlying failure mechanisms are present, a differential evolution framework and a boundconstrained expectation maximization algorithm are developed; both these approaches significantly outperform the gradient-based L-BFGS-B algorithm. New schemes for …
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Numerical Analysis of FFP Impact on Saturated Loose Sand
… and tends to develop a general bearing capacity failure mechanism. This is because the pore water increases the stiffness of the system and due to the increased strength that develops in saturated dilative sands when negative pore pressures develop. Local bearing failure mechanism is observed in …
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Design Automation for Reliable CMOS Chip Input/output Circuits
Thermal failure is one of the most prevalent failure mechanism during the Human Body Model (HBM) ESD stress. Previous circuit thermal model (integrator circuit) in iETSIM only applies for constant current stress. A general thermal model using convolution is developed. New techniques are proposed to …
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Compound Semiconductor Material Manufacture, Process Improvement
… changes very rapidly, correspondingly the failure profile of the process is equally as dynamic, it is essential therefore that the analysis and projected activities and actions can be identified and consolidated in a timely manner.<br/><br/>This project evaluates the process used by IQEE to …
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An axisymmetrical model for a single vertical pile in sand
… pile behavior in sand and to establish the pile failure mechanism. The stresses and coefficient of earth pressure acting on the pile shaft were reported. A new failure mechanism was developed which varies with: pile geometry, coefficient of earth pressure, shaft roughness and angle of shearing …
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Design of Novel High Temperature Thermosetting Resins Tailored to Specific Needs
… stronger chemical interaction at the interface. Failure mechanism of Zn-coated Cu foil with ATSP was both cohesive and adhesive. Only adhesive failure occurred at the ATSP/Cu and ATSP/Ni interface.
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Shear strength and bearing capacity of reinforced concrete deep beams
… are the most effective form of reinforcement. A failure mechanism for a concrete block in bearing is proposed and found to give the best estimate as compared with other models by different researchers. The second part is concerned with the behaviour of reinforced concrete deep beans with …
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Effects of water on chemomechanical instabilities in amorphous silica : nanoscale experiments and molecular simulation
We elucidate the tensile failure mechanism of amorphous silica and the effects of water on the process, combining: (a) atomic force microscope (AFM) bending tests, (b) molecular dynamics (MD) simulation and (c) molecular orbital (MO) simulation. Bending tests of silica nanowires provide validation …
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Structural integrity assessment of engineering components under cyclic loading at high temperature
… problems due to creep, fatigue, creep-fatigue failure mechanisms. Hence, performing structural integrity assessment accurately and developing effective assessment methods are vital tasks in these industries.;In order to contribute to the research field of the high temperature industries, this …
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Effect of Oxidation of Graphene on Agglomeration and the Mechanical Properties of Thermosetting Resins
… tension and bending. Under compression, the failure mode of the epoxy changed from brittle to slow tearing by adding 0.1 weight percent or greater of GO nanoplates. Computed tomography revealed the presence of previously unreported fissures in the GO samples, which were not seen in the neat …
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A stochastic model of component failure mechanisms
… reaction is used in representing a component failure mechanism. The component is said to fail when the concentration of reaction product accumulates beyond an acceptable level. The process of accumulating reaction product is modelled as a Markov pure birth process which, in turn, is used in …
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Integrated field investigation, numerical analysis and hazard assessment of the Portillo Rock Avalanche site, Central Andes, Chile
… of this research was to investigate the likely failure mechanism and characterise the runout path and volume of the PRA. The insights gained on the back analysis of the slope were used in later stages to assess the hazard potential of a recurring major rockslide. The distinct element code UDEC …
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Air Injection Technique to Mitigate Liquefaction beneath Shallow Foundations
… velocimetry was utilised to identify deformation mechanisms that develop underneath and in the ground surrounding shallow foundations. It was shown that foundations resting on saturated soil settled excessively. Foundation settlements were predominantly driven by deviatoric strains, and a bearing …
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