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 86 for “"structural failure"”.
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Stress Transfer and Structural Failure of Bilayered Material Systems
… Understanding how loads transfer within these structural systems is necessary to predict failure and develop effective designs. Existing methods for evaluating the stress transfer in bilayered materials are limited to overly simplified models or require experimental calibration. As a result, …
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A Computational Thermo-Chemo-Mechanics Framework for the Large-Scale Simulation of Material and Structural Failure in Hypersonic Environments
… morphology regimes are corroborated by a simple structural theory. Finally, cohesive fracture models, splitting methods and thermal solvers are developed specifically for applications to thermally shocked ceramics. Simple and rigorous calibration procedures are proposed which facilitate the …
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Thermo-mechanical modeling of a micro-fabricated solid oxide fuel cell
… operation conditions, making it susceptible to structural failure. This thesis investigates the mechanisms of its structural failure, develops tools and models to understand the mechanisms quantitatively, and gives suggestions to guide the design process with the models developed. The thesis …
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Resistência última de navios e plataformas danificados por colisões
Extreme events may lead to a structural element experiencing a loading scenario above a critical limit known as ultimate strength. This structural failure, in some cases, can develop into the progressive collapse of other structural elements and generate catastrophic consequences. Offshore …
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Stiffness and Strength Predictions of Discontinuous Fiber Composites
… model called the ply discount scheme. Final structural failure of the part is declared when all plies within a single element have failed. Other definitions of final structural failure are also explored in this study. A typical analysis predicts that ply failures (i.e., “damage”) will evolve …
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Application and analysis of stiffened side shell panel failure for naval patrol craft
… are loaded beyond their means, resulting in structural failure. This thesis focuses on how side shell stiffened panel failure occurs from a global and local perspective, bridging the gap between a real life problem and mechanics theory in an effort to reduce uncertainty in the ship structural …
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Finite element-based failure models for carbon/epoxy tape composites
… structures. However the difficulty to capture structural failure phenomena is a significant barrier to more extensive use of laminated composites. Predictions are challenging because matrix (resin) dominated failure mechanisms such as delaminations and matrix cracking contribute to the …
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Study of Size Reduction, Reliability and Lead Safety of an Intra-Cochlear Lead-Zirconate-Titanate Micro-Actuator
… of tests are performed to investigate possible failure mechanisms. They are in-air tests, soaking tests, and in-fluid driving tests. The first two tests specifically focus on structural failure and electrical failure, respectively, while the third test investigates their combined effects. Test …
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A reliability rating system for flood embankments in the United Kingdom
The probability of structural failure of flood defences is an important component in the modelling of flood risk. Flood embankments are a very common type of defence whose reliability assessment shows some problematic aspects. In particular it is difficulty to model the process of piping through …
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The Effects of Aircraft Certification Rules on General Aviation Accidents
… Control, Controlled Flight into Terrain, Engine Failure, and Structural Failure.</p> <p>Airworthiness certification categories represent a wide diversity of government oversight. Part 23 rules have evolved from the initial set of simpler design standards and have progressed into a comprehensive …
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Cuantificación económica del riesgo inherente de fallo estructural en edificaciones
… siniestralidad de las construcciones por fallos estructurales debidos a estos riesgos inherentes, de manera que el valor conocido permita el diseño de acciones preventivas y la financiación de los posibles daños posteriores. Para ello, estamos utilizando técnicas de observación de resultados …
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ON THE INTERACTION OF SUBLIMATING GAS WITH COMETARY BODIES
… that exceed its material strength, resulting in structural failure and breakup of the nucleus. I show that this mechanism is consistent with the behavior of Comet ISON (C/2012 S1), and use it to estimate the cohesive strength of ISON’s nucleus, a first for a Long-Period Comet.
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Reliability-based performance assessment and optimum maintenance of corroded reinforced concrete structures
… the concrete structures to an extent of serious structural failure. Consequently, this increases the resources required for the maintenance and rehabilitation over time. Due to uncertainties associated with the performance deterioration, it is difficult to accurately assess the residual strength …
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Design of test bench apparatus and preliminary weight reduction strategy for an active knee prosthesis
This thesis presents the design and structural analyses of an experimental test bench for the characterization of an active biomimetic knee prosthesis currently being developed by the Biomechatronics research group at MIT Media Laboratory. Finite element analysis (FEA) is conducted to determine the …
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Investigation of the mechanics of windborne missile impact on window glass
Engineers have recognized that failure of the building envelope is one mechanism that can lead to severe damage of structures during windstorms. The building envelope consists of the roof, doorways, windows, and cladding components that form the exterior wall system of a building. Failure of the …
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Modeling Behaviour of Damaged Turbine Blades for Engine Health Diagnostics and Prognostics
… to careful damage tolerant design a method of structural design based on the assumption that flaws (cracks) exist in any structure and will continue to grow with usage. With proper monitoring, largely in the form of periodic inspections at conservative intervals reliability and safety is …
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Structural evaluation of fixed offshore platforms
… enough to be the source of a subsequent massive failure. A technique is described that can be used to detect subsurface structural failure by detecting changes in the natural frequencies of the structure. One tower aas extensively studied; the dynamic measurement and analysis techniques are …
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Response Surface Method for Time-Variant Reliability Analysis
… efficient, approximate method for computing the structural reliability of uncertain systems subjected to time-varying loads is presented in this study. The method uses response surface methodology and the fast integration scheme developed by Wen and Chen (1987). The mean and coefficient of …
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Evaluation of behavior and the radial shear strength of a reinforced concrete containment structure
… wall and basemat interaction. A possible mode of structural failure of containments subjected to high pressures is by radial-shear failure at the wall-basemat connection. Although the containment model showed no sign that such a failure was imminent when the test was stopped, if the internal …
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Effects of structural repair and strengthening on stiffness and ultimate capacity of corrosion-damaged RC beams
… for old and new structures. The main cause of structural damage in RC structures is corrosion of reinforcement. Therefore there is a need to understand the effects of corrosion damage on the structural properties of RC members such as stiffness and ultimate capacity in order to develop improved …
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