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 19 of 19 for “"micro machining"”.
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Computational control of laser systems for micro-machining
Depending on the size and geometry, laser-microfabricated structures in transparent materials have applications in telecommunications, microfluidics, micro-sensors, data storage, glass cutting and decorative marking applications. The relations of Nd:YV04 and C02 laser system parameter settings to …
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Femtosecond laser micro-machining and consequent self-assembled nano-structures in transparent materials
… developments in the field of femtosecond laser micro-machining within the bulk of transparent materials. Thanks to its unique properties, the femtosecond laser writing technique offers the potential for realizing three-dimensional multi-component photonic devices, fabricated in a single step and …
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Analysis of droplet behavior on a rotating surface in atomization-based cutting fluid systems for micro-machining
… in providing both cooling and lubrication for micro-scale machining operations. The ACF systems are preferable over the conventional flood cooling methods as they effectively reduce the temperature at the workpiece-tool interface through evaporative cooling and provide superior lubrication to …
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MODELLING AND SIMULATION MICROMACHINING OF THE ADDITIVELY MANUFACTURED METAL PARTS
… models and simulations to study and predict the micro machining process of selective laser melted (SLMed) stainless steel 316L. The influence of heat treatment conditions, scanning strategies, and machining process parameters on the machinability and surface roughness of additively manufactured …
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Design & Fabrication of Super-Hydrophobic Surfaces by Laser Micro/Nanoprocessing
… including glass and metal substrates by laser micro/nano-processing, are presented in this thesis. Three techniques have been developed to successfully make super-hydrophobic surfaces on glass and metal substrates. The first technique is to make super-hydrophobic transparent surfaces on glass …
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Ultra wide-bandwidth micro energy harvester
… of the input vibration spectrum. The device is micro-fabricated by a combination of surface and bulk micro-machining processes. Released devices are packaged, poled and electro-mechanically tested to verify the wide-bandwidth nonlinear behavior of the system. Two orders of magnitude improvement …
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Development of standard components for multi-degrees-of-freedom mems positioning stages with closed-loop feedback
Devices at the micro and nano scale are playing a significant role in a variety of fields such as electronics, micro-fluidics, bio-medical applications, and MEMS in micro-electro-mechanical systems. These miniaturized devices have advantages such as higher efficiency, less power consumption, and …
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Laser Surface Texturing To Create Biomimetic Surface Topographies For Marine Antifouling Efficacy Testing
… onto marine grade stainless steel using laser micro machining. The investigation was split into three main research questions: (1) can laser surface texturing be used to create antifouling surfaces, and their effects on surface parameters (roughness / contact angle); (2) can biomimetic …
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Nanofocusing Refractive X-Ray Lenses
… are well-suited for high resolution x-ray microscopy. The goal of this work is the design of a reproducible manufacturing process which allows the production of silicon lenses with high precision, high quality and high piece number. Furthermore a process for the production of diamond lenses …
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Development of a centrifugal microfluidic device for separation and sorting in biological fluids
A wide interest in employing micron-scale, integrated biochemical analysis systems for economical and rapid diagnosis has been the principal motivation behind this project. Low operating costs, portability and fast diagnosis times make centrifugal microfluidic devices an attractive option in …
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Fundamental study of magnetic field-assisted micro-EDM for non-magnetic materials
Micro-Electrical Discharge Machining (µ-EDM) is a unique machining method capable of removing material in the sub-grain size range (0.1-10 µm) from materials irrespective of their hardness. This process is valuable in the manufacturing of miniaturized products where industry demand for increasingly …
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Modeling and Interpretation of Fiber Orientation-Based Failure Mechanisms in Machining of Carbon Fiber-Reinforced Composites
… appropriate fiber and matrix materials into the microstructure. While these materials have recently become popularized, many complications arise in the manufacturing process of the two-phase microstructures, specifically in the machining of FRP composites. Due to the complex nature of FRP …
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Real-time characterization of transient dynamics in thulium-doped mode-locked fiber laser
… a wide range of applications such as precise micro-machining, spectroscopy and metrology. Applications such as metrology and spectroscopy rely on the stability of mode-locked lasers (MLLs) which provide extreme precision, yet, the complex dynamics of such highly nonlinear systems result in …
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Engineering ionic liquid ion sources for ion beam applications
… for a specific application. In addition, using micro-fabricated and nano-structured emitter arrays operating in the PIR can give access to efficient and compact positive or negative ion sources, for applications from spacecraft thrusters to deep reactive ion etchers (DRIE). There is a need for …
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The design and development of a Spark Assisted Chemical Engraving system with force feedback control
Spark Assisted Chemical Engraving is a hybrid micromachining method capable of machining micro-holes and micro-channels on non-conductive substrates. This thesis centers around the design of a mechatronics system for precision manufacturing using SACE technology. The setup consists of a machining …
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Prediction of cutting forces in five-axis micro-ball end milling
Five axis micro-ball end milling has been shown as a viable option for machining complex free form surfaces with high aspect ratios and provide micron-scale tolerances. Unfortunately, due to the high fragility of the cutting tool, premature tool failure has been a major challenge in micro-scale …
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Design and construction of a novel reconfigurable micro manufacturing cell
… usually produced using large-size conventional machining tools. This results in the inadequate usage of resources, including energy, space and time. In the 1990s, the concept of a microfactory was introduced in order to achieve better usage of these resources by scaling down the size of the …
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Ultrafast Machining of High Temperature Superconducting Nanostructures for Novel Mesoscale Physics
… scribing, and focussed ion beam, laser machining of YBCO has been continuously studied since 1988 due to its design flexibility and the absence of chemicals. One thing that is still not adequately understood is the nature of laser induced damage on YBCO, and to what proportion it affects …