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 46 for “"mechanics model"”.
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An improved structural mechanics model for the FRAPCON nuclear fuel performance code
… the FRAPCON nuclear fuel performance code, a new model, the FRAPCON Radial-Axial Soft Pellet (FRASP) model, was developed. This new model uses 1.5D structural mechanics to represent both the fuel pellet and cladding along with their interaction via interfacial forces. The fuel pellet and cladding …
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A probabilistic fracture mechanics model for the tubing degradation of the Koeberg steam generators
The susceptibility of Steam Generator (SG) Tubes (particularly tubes manufactured from Inconel 600) to primary water stress corrosion cracking (PWSCC) has been a major concern to the nuclear industry since 1971, when this phenomenon was first observed outside the laboratory. Since the …
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Nonlinear Dynamics and Vibration of Gear and Bearing Systems using A Finite Element/Contact Mechanics Model and A Hybrid Analytical-Computational Model
… are analyzed using a finite element/contact mechanics (FE/CM) model. A hybrid analytical-computational (HAC) model is proposed for nonlinear gear dynamics. The HAC predictions are compared with FE/CM results and available experimental data for validation. Chapter 2 investigates the static and …
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Respiratory function: A systems approach
… neuronal behavior. We develop computer-based models that emulate the regulatory operation of respiration. We adopt a systems view of the process, whereby the breathing apparatus (mechanics model) represents the plant, actuated by the respiratory muscles and controlled by the CPG. The mechanics …
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A coupled contact-mechanics computational model for studying deformable human-artifact contact
… joint interfaces such as hip bearings. However, modeling the effects of human-suit interaction for these softgood materials is challenging due to the highly deformable nature of the suit coupled with the deformable nature of the human. To enable improved analysis and design of modern spacesuits, …
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Modelling, simulation, and control of robots
The continuous dynamic model of a robot is represented by nonlinear coupled differential equations. These can be discretized using first or second order Taylor's series approximations. One such model, the Greenspan Discrete Mechanics model appears to be the best for control applications. Global …
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Fracture Behavior of Masonry Bond
The applied fracture mechanics model, when both elastic and inelastic deformations were considered, always over-estimated the post-peak behavior. However, the post-peak behavior was successfully predicted when the model was modified to consider only elastic deformation. The analysis indicated that …
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The State-Based Peridynamic Lattice Model
The reigning material model of today is continuum mechanics. Continuum mechanics assumes that a material is continuous and can be represented by mathematical functions. This is an unreasonable assumption for concrete due in part to the fact that concrete cracks and the continuum mechanics model …
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An Optimization Approach to Certified Manipulation
… We plan to study the interplay between contact mechanics, geometry, and machine learning to synthesize manipulation plans with varying theoretical properties. More specifically, we propose a quasi-dynamic mechanics model for contact-trajectory optimization and apply it to solve long-horizon …
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Scratch tests : a new way of evaluating the fracture toughness of materials
… develops, validates and implements a fracture mechanics model for the assessment of the fracture toughness of materials from scratch tests. Dimensional Analysis highlights two major processes at work during scratch tests: plastic yielding and fracture dissipation. An original set-up of …
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Time dependent flexural analysis of reinforced concrete members
… and deflections to the structure. The mechanics of quantifying the serviceability deflection of RC beams is complex due to flexural cracking and the associated partial interaction (PI) behaviour of slip between the reinforcement and adjacent concrete. Add the additional complexity of …
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Design and manufacturing of novel hybrid metal-polymer heat exchangers
… conformal rolling, we develop a theoretical mechanics model to study important forces/factors responsible. Finally, we report data from a real-world demonstration for such heat exchangers within a campus building to analyze the performance and gauge potential under wider operating conditions. …
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Understanding and Mimicking the Fly's Directional Hearing: Modeling, Sensor Development, and Experimental Studies
… directional microphones. First, through mechanics and optimization analysis, a fundamental biological conclusion is reached: the fly ear can be viewed as a nature-designed optimal structure that is endowed with the dual optimality characteristic of maximum average directional sensitivity …
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Fundamental Modeling and Experimental Investigation of Dynamic Friction at the Meso and Micro Scales
In this work, a basic dynamic friction model without any empirical parameters has been developed and used to predict and explain important dynamic friction phenomena. The validation of the proposed dynamic friction model has also been confirmed via experimental measurements. Moreover, adhesion …
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Mesh adaptation through r-refinement using a truss network analogy
… the use of a truss network, a structural mechanics model, as a metaphor for adapting a computational fluid dynamics (CFD) mesh. The objective of such adaptation is to increase computational effi- ciency by reducing the numerical error. To drive the adaptation, or to give the scheme an …
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Thermomechanical analysis of rock asperity in fractures of enhanced geothermal systems
… studied by establishing an un-symmetric damage mechanics model. The deformation curve of asperity under thermal stress is determined. Thirdly, deformation of fracture with various asperities on it in response to thermal stress is analyzed by a new stratified continuum percolation model. This …
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Numerical Investigation of Cleavage Fracture in Welded Connections of Steel Moment Resistant Frames
"This study applies an advanced micro-mechanics model of cleavage fracture in ferritic steels to examine the behavior of welded, moment resistant steel frames of the type widely constructed prior to the 1994 Northridge earthquake. The Weibull stress model for cleavage, coupled with 3-D analyses of …
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