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 40 for “"failure model"”.
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Development of a Progressive Failure Model for Notched Woven Composite Laminates
… and require more complex methods for predicting failure. NASA is seeking a method for predicting the damage initiation and propagation of woven fabric composites in order to utilize these materials effectively in SLS hardware. This work focuses on notched woven fabric composites under tensile …
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Development of a High Temperature Gas-Cooled Reactor TRISO-coated particle fuel chemistry model
… gained from the chemical analysis, a chemical failure model is incorporated into the MIT fuel performance code, TIMCOAT. Palladium penetration of the SiC layer is added to the fracture mechanics failure model. Rare-earth fission product and palladium corrosion of the SiC layer are additionally …
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Condition Assessment, Indices, and Risk-based Decision-making for Public School Infrastructure Management
… of a condition index algorithm and risk of failure model would provide school planners an efficient management tool to predict the future condition of asbestos containing material and lead based paint assets. As a result, school planners would be able to prioritize maintenance, repair, and …
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Simulation of a swine nursery to facilitate economical management
Two deterministic simulation models were developed to assess the economics of swine nurseries. The first model assessed the emergency needs of swine nurseries by simulating the temperature response during a short term power failure. The failure model accounted for heat exchange by conduction, …
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A Simple Computational Model for the Prediction of Fuel Pin Failure During A Transient-Overpower Accident
A fuel pin failure model is developed and incorporated into a fast-running computer program. The model is designed to predict irradiated fuel-pin cladding rupture during a hypothetical transient-overpower (TOP) accident in a liquid metal fast breeder reactor. The principal failure mechanisms of …
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A study of brittle powder compaction using a combined discrete finite element approach
… media. Using the Finite Element Method to model the behaviour of each discrete element has resulted in the Combined Finite Discrete Element Method. This combination allows researchers to investigate the behaviour of assemblies of particles in which each particle need not behave in an …
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Enhancing network robustness via shielding
… to guarantee network connectivity after any failure under geographical and general failure models. We develop a mixed integer linear program (MILP) to obtain the minimum cost shielding to guarantee the connectivity of a single source-destination (SD) pair under a general failure model, and …
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In Space Reverse Logistics
… servicing (OOS). A modular probabilistic Failure Model is proposed, designed, and implemented to collaborate with a custom-made orbital propagator to work as a space logistics simulator. The ISRL Failure Model is a modular and resilient binary random stochastic process with time-varying …
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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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An integrated performance model for high temperature gas cooled reactor coated particle fuel
… for future power generation. Fuel performance modeling is indispensable for understanding the physical behavior of fuel particles and achieving their high reliability during operations and accidents through a guided design process. This thesis develops an integrated fuel performance model of …
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Micromechanics of strength-related phenomena in composite materials
Micromechanical models are presented which can be used to evaluate: stress concentrations in the vicinity of single and multiple fiber fractures in unidirectional composites under axial loading; the tensile strength of unidirectional composites; fiber coatings that can be used to maximize the …
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Sahraei failure criteria for detection of short circuit in lithium-ion batteries
… loading conditions and developing predictive models for failure is essential for enhancing safety and optimizing protective structures in EVs. This dissertation presents a comprehensive analysis of Li-ion battery behavior under multiple loading scenarios, supported by two novel modeling …
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Investigation of composite façade mullions
… actions between aluminium and polyamide were modelled based on Coulomb’s friction theory. Two new failure models – “Proposed progressive failure model” and “Proposed partitioned multi-phase beam failure model” were developed and applied to section shear capacity model and beam bending models …
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Time and probablity of failure of timber framed walls in fire
… of the research for this thesis was to develop models to predict the performance of fire resistant light-timber framed walls, in relation to requirements of new performance-based building fire regulations being introduced around the world. The performance bases that were adopted in the …
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The Relationship Among HFACS Levels and Analysis of Human Factors in Unmanned and Manned Air Vehicles
… applied to HFACS taxonomy based on the Reason Model via path analysis – structural equation modeling. The study concluded the presence of statistically significant paths at both UAV and MAV accidents and common partial paths of those aircraft types within the framework of DOD HFACS taxonomy. …
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Optimum crashworthiness design of grid-stiffened composite fuselage structures
… was implemented in concert with a progressive failure model to model the entire crash sequence, including failure events and subsequent response. Several examples were used to validate this method. This method was then implemented, along with simple models for assessing the ability of a …
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The Pharmacokinetics of Oxytetracycline in Dogs With Normal and Impaired Renal Function
A renal failure model was developed in 29 dogs by electrocoagulation of one renal cortex and contralateral nephrectomy to enable the adjustment of therapeutic drug doses in relation to renal function. The magnitude of renal dysfunction, defined by the percentage of normal glomerular filtration rate …
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Fire Response of Loaded Composite Structures - Experiments and Modeling
In this work, the thermo-mechanical response and failure of loaded, fire-exposed composite structures was studied. Unique experimental equipment and procedures were developed and experiments were performed to assess the effects of mechanical loading and fire exposure on the service life of …
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Response of thin circular plates to central blast loading
… as well as strain rate sensitivity. A material failure model is also incorporated. The SA.XI axisymmetric sheet elements are used to model the plate. The shell element uses a theory that includes shear deformation effects but degenerates to the Kirchoff classical thin shell theory for thin shell …
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Simulated Response of Degrading Hysteretic Joints With Slack Behavior
A novel, general, numerical model is described that is capable of predicting the load-displacement relationship up to and at failure of multiple-bolt joints in timber of various configurations. The model is not tied to a single input function and bolt holes are permitted to be drilled oversize …
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