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 71 for “"Wrinkles."”.
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Wrinkles
… what we call - architecture. This thesis uses “wrinkles” as a conceptual thread to study the correlation between a building’s life cycle and the life cycles of the humans who inhabit it. It seeks an alternative to break the binary of before/after, and to redefine the beginning and the end of …
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Ruins and Wrinkles: Revaluing Age through Architecture
In this thesis I argue that an architecture that selectively intervenes in the aging landscape to provide opportunities for regeneration and mentorship can weaken our societal divisions. I tested this hypothesis in the context of an adaptive reuse, multi-generational, mixed use design for the …
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3D facial modeling with geometric wrinkles from images
… details while deforming, which means lack of wrinkles while face shows different expressions. Also, to create a realistic face model for an individual is also needs complex setup and sophisticated works from experienced artists. The goal of this dissertation is to achieve an end-to-end system …
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Permanent press, no wrinkles : reinforced double diaphragm forming of advanced thermoset composites
Structures made out of advanced composite materials have significant advantages over those made from metals. The chief advantages are high strength-to-weight ratio, the ability to tailor mechanical properties, high fatigue resistance and good corrosion resistance. The manufacturing methods used to …
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Effect of Geometric Imperfections (Wrinkles) on the Circumferential Strength of a Composite Polymer Liner for Pressure Pipes
… in the formation of geometric imperfections (wrinkles) as the external diameter of the liner often exceeds the internal diameter of the host pipe. Previous studies have suggested that the wrinkles have a detrimental effect on the structural performance of the liner. In this study, experimental …
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Characterization of sub-surface wrinkles within a laminated composite using a novel phased array ultrasonic scanning technique incorporating a portable nozzle and robotic arm.
… compromised by the presence of out-of-plane wrinkles, a manufacturing defect that occurs in thick complex curvature composite stacks. This thesis presents an ultrasound scanning technique utilizing a novel phased array approach to detect out-of-plane wrinkles and, unlike previous literature …
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Developing a Computer System for the Generation of Unique Wrinkle Maps for Human Faces. Generating 2D Wrinkle Maps using Various Image Processing Techniques and the Design of 3D Facial Ageing System using 3D Modelling Tools
… of ageing is the appearance and development of wrinkles. Facial wrinkles are skin folds; their shapes and numbers differ from one person to another, therefore, an advantage can be taken over these characteristics if a system is implemented to extract the facial wrinkles in a form of maps. This …
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Field-Scale Monitoring and Laboratory Simulation of Geosynthetic Liners During Construction and After Placement of Waste
… First, field-scale monitoring of geomembrane wrinkles in a 1.5-mm-thick, black high-density polyethylene geomembrane during placement of cover soil is reported from three field investigations with an emphasis on the effects of cover soil placement techniques, construction equipment and …
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Confined wrinkling of thin elastic rods, sheets and cones
… modes, forming more and more sinusoidal waves or wrinkles. Rods and rectangular sheets form straight wrinkles with constant wavelengths. Less regular shapes, such as trapezia and rectangles with a hole, form curved wrinkles with a variable wavelength, which is inversely proportional to the square …
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Understanding the correlation between wrinkle morphology, fracture and fatigue of plain woven CFRP laminates through mechanical and ultrasonic characterization.
Wrinkles, often perceived as manufacturing defects in carbon fiber-reinforced polymer (CFRP) laminates, can significantly alter the fracture and fatigue behavior of composite structures. This dissertation presents a comprehensive experimental investigation into the influence of out-of-plane …
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Wrinkling Patterns on Curved Surface with Gradient Curvature under Compression
… and optical.</p> <p>First, we investigate the wrinkles on a tri-layer torus consisting of an expanding thin outer layer, an intermediate soft layer, and an inner core with a tunable shear modulus. This study is inspired by pattern formations and evolutions in developmental biology, such as …
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Wrinkling of Membrane and Thin Film under Torsion
… strain for the wrinkle onset, the number of wrinkles, the wrinkle amplitude and the radius of the wrinkled region on a pre-tensioned circular membrane under torsional load at the inner hole of the membrane. The results are compared with those from the commercial finite element analysis …
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Ordering of Nanoparticles by Wrinkle-Assisted Self-Assembly : Controlling Plasmonic Coupling Effects
… oxidation. After releasing the strain, periodic wrinkles appeared perpendicular to the applied strain. Under defined conditions, such wrinkles have a regular sinusoidal topology featuring a single dominant wavelength and amplitude. The formation process could easily be tuned by tuning the plasma …
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Predictive design and fabrication of complex micro and nano patterns via wrinkling for scalable and affordable manufacturing
… as localized material defects for curved wrinkles Curved wrinkles have been demonstrated in the past during equibiaxial compression of nonuniform materials. However, predictive design of target patterns via curved wrinkles is not feasible at present due to the lack of simple yet effective …
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Wrinkling behaviour of biaxial non-crimp fabrics during preforming
… the initial preforming stage of LCM, notably wrinkles, are a key obstacle preventing automation and adoption of LCM, because wrinkles significantly compromise the component performance, and because there is currently no reliable method for mitigating them. To pave the way towards wrinkling …
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Wrinkling in polygonal membranes
… must be maximal and it is vital to mitigate wrinkles. In this thesis, the origins of the wrinkles are investigated and two novel stress analysis methods for polygonal membranes are developed initially. The first uses Airy stress functions: by superposing a number of these functions, and …
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Dielectric Elastomer Actuators in Electro-Responsive Surfaces Based on Tunable Wrinkling and the Robotic Arm for Powerful and Continuous Movement
… Current methods to generate anisotropic wrinkles rely on mechanical pre-loading such as stretching or bending, which complicates the fabrication and operation of the devices. With a fixed mechanical pre-loading, the device can only switch between the flat state and the preset wrinkling …
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Field Performance of Exposed Geosynthetic Composite Liner Systems
… Environmental Liner Test Site (QUELTS II). Wrinkles were quantified for black and high albedo white high-density polyethylene geomembranes (both smooth and textured). Relative to the black geomembrane, wrinkles in the white geomembrane formed later in the morning and reduced sooner in the …
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De-wrinkling of cellulosic barrier materials coated on paper during scale-up on a roll-to-roll system
… fabrication process is the formation of surface wrinkles. The wrinkling instability could arise because of the mismatch strain between film and substrate, paper swelling, and external forces such as constrained edges during the coating and drying processes. This instability leads to surface …
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Effect of pattern and coating properties on defect formation in aluminum lost foam castings
… thickness. SEM imaging showed the presence of wrinkles on fold surfaces while no wrinkles were found on the surface of pores"--Abstract, page iii.</p>
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