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 16 of 16 for “"damage modeling"”.
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Finite element damage modeling of plain weave fabrics
… tensile loading is presented. Then, a meso level damage model is used for predicting the inelastic tensile behavior of the fabrics. The damage model is validated for the tensile response of T300/5208 laminate for four configurations, [10/-10]2s, [0/45/-45/90] s, [30/-30]2s and [45/-45]2s. Then, …
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Damage Modeling Method For Turbine Compressor Blade Tuning
… thesis presents a method of evaluation for blade damage in Combustion Turbine Compressor Section. This method involves use of multiple domains within a single Finite Element Model to predict the effect of damage on the blade properties. This approach offers significant time and effort savings when …
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Predictive earthquake damage modeling for natural gas distribution infrastructure
… the organization has invested extensively in modeling technology to help estimate resource needs and develop resiliency plans in the event of an earthquake. This thesis aimed to develop a damage prediction model to improve emergency response time and restoration efficiency. The …
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A framework for damage modeling in multi-constituent laminated materials
… materials can cause deformation and eventually damage to the overall structure of the material. There are two methods discussed throughout the document: mixture theory to discuss the evolving curing and thermal effects on the structural behavior of a fiber reinforced laminate structure and a …
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Predictive storm damage modeling and optimizing crew response to improve storm response operations
Utility infrastructures are constantly damaged by naturally occurring weather. Such damage results in customer service interruption and repairs are necessary to return the system to normal operation. In most cases these events are few and far between but major storm events (i.e. Hurricane Sandy) …
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Damage Progression in Open-Hole Tension Composite Laminates by the Element-Failure Method
Damage Propagation in composite laminates is traditionally modeled by the material property degradation method (MPDM), which assumes that a damaged material can be replaced by an equivalent material with degraded properties. In this thesis, a new damage-modeling technique known as the …
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Multi-Failure Mode Risk Assessment of the Houston/Galveston Bridge System to Hurricane Threats
… uplift and bridge scour. Due to recent hurricane damage of bridges, emergency managers need to understand the potential state of the bridge network immediately following a storm for effective mitigation and post-event planning. To that end, this study builds a new database of bridge information …
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Characterization of microparticle velocities in converging-diverging nozzle systems
… suggests that atmospheric aerosols may cause damage to them. Ongoing work in particle impact damage modeling, aerosol deposition methods, and fundamental studies of particle impact dynamics require acceleration of particles to high speeds and associated measurements, models, and simulations to …
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Modeling the Residual Strength Distribution of Structural GFRP Composite Materials Subjected to Constant and Variable Amplitude Tension-Tension Fatigue Loading
… design applications. The work so far focuses on modeling the response of the material to fatigue damage only. A general phenomenological modeling approach is described and applied in two experimental studies using E-glass/vinyl ester composite materials. Strength distributions are modeled using …
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Material Point Methods For Simulating Material Fracture
… of fresh bread to dropping a glass on the floor. Modeling this complex physical process has a near limitless breadth of applications in everything from computer graphics and VFX to virtual surgery and geomechanical modeling. Despite the ubiquity of material failure, it stands as a notoriously …
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Experiments augmented computational analysis of structural materials: A focus on metallic and biological systems
… steels to simulate plastic deformation and damage, calibrated and validated using experimental data. A deep learning-based approach is then applied to analyze the structure-property relationships and design pearlite lamellae for optimized mechanical performance. Furthermore, the study …
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Life cycle assessment case study of North American residential windows
… based on IMPACT 2002+ v2.1 characterization and damage factors. The damage modeling results indicated that the life cycle impacts are dominated by the combustion of nonrenewable energy resources. Burning fuels cause increased emissions of respiratory inorganics, terrestrial …
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Assessing natural risks for railway infrastructure and transportation in Austria
… single societal or economic sectors – e.g. flood damage models largely concentrate on private-sector housing – and other important sectors, such as the transport infrastructure sector, are widely neglected. However, transport infrastructure considerably contributes to economic and societal …
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Modeling Behaviour of Damaged Turbine Blades for Engine Health Diagnostics and Prognostics
… gas turbine engines is largely due 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 …
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Finite element-based failure analysis of composite laminates with non-destructive feature quantification.
… caused by improper drilling with complex initial damage; and generates predictive models through novel implementations of the finite element method that are experimentally validated. The first case uses the uncertainty in the ply orientation based on measurements from an ultrasound inspection to …
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Characterization of damage mechanisms and behavior in two-dimensionally braided composites subjected to static and fatigue loading
… and fatigue loading conditions to determine damage mechanism types and progressions. The braided architectures consisted of straight axial fiber bundles, which were surrounded by braider fiber bundles oriented at ±a 0 with respect to the axial fiber bundles. Static tension and compression …