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 “"strain mapping"”.
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Segmentation and Strain Mapping of a Beating Heart
… and after deformation to help estimate the strain fields. However, these current meth ods often introduce undesirable error that propagates through the system, growing larger through each strain calculation. These errors create false, concentrated regions of strain throughout the image. …
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Quantitative analysis of crystal lattice and defects in nanoscale functional materials by electron diffraction
… a powerful and versatile technique for lattice strain mapping using SEND. The measurement of strain is based on determining the Bragg peak positions recorded in the diffraction patterns from a local crystal volume. To address the issue of peak broadening from a focused electron probe, we propose …
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Morphological and Mechanical Quantification of Porous Structures by Means of Micro-CT (Morfologische en mechanische kwantificatie van poreuze structuren met behulp van micro-CT)
… mechanical loading, FE analysis and local strain mapping as this combination allows to (i) provide in-situ and experimentally the mechanical properties, (ii) link the mechanical properties to the morphology, (iii) investigate the morphological changes under compressive loading, (iv) feed …
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DATA-DRIVEN MULTI-SCALE MULTI-PHYSICS MODELLING OF THERMAL STRESS AND DISTORTION IN ADDITIVE MANUFACTURING
… track-scale simulation, the non-uniform inherent strain mapping method is investigated to accurately and efficiently model thermal stress and distortion at the part scale. The position-dependent inherent strain attribution results show good agreement with the experimental measurement and reference.
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Methods and Applications for Nanometrology using Scanning Precession Electron Diffraction
… for two key areas within the field - orientation mapping and strain mapping - are demonstrated, allowing for significant increases in both throughput and accuracy. Comparisons are made between different electron-based techniques including the extremely popular electron backscatter diffraction …
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Crystal Cartography: Mapping Nanostructure with Scanning Electron Diffraction
… challenges in materials science, particularly: strain mapping in two and three dimensions, revealing inter-phase crystallographic relationships, mapping grains in two-dimensional materials, and probing nanostructure in polyethylene.
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Decoding of Facial Strains via Conformable Piezoelectric Interfaces and Three-Dimensional Digital Image Correlation
… of an integrated system for decoding facial strains and for predicting facial kinematics. The system consists of massmanufacturable, conformable piezoelectric thin films for strain mapping; multiphysics modelling for analysing the nonlinear mechanical interactions between the conformable …
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Plasticity of γ-TiAl alloys
… in compression was investigated by mapping the development of localised strain at the specimen surface. Methods were developed to produce speckle patterns for high resolution digital image correlation that were stable at test temperatures of 700 °C in air, in order to study the …
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A patient specific total disc replacement to treat degenerative disc disease
… scaffold to potential cellular responses, cyclic strains of 4–10% were applied to human mesenchymal stem cell (hMSC)-seeded membranes to quantify changes in extracellular matrix composition. These findings were then compared with strain distributions predicted across the scaffold’s fibres, linking …
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On the Plasticity of Layered Crystals
… using digital image correlation assisted pillar strain mapping, along with considerations of pillar size and crystal orientation, to ensure accurate assessment of the yield stress. In the Th₆Mn₂₃ structure type, exploratory testing was carried out using nanoindentation, aiming to compare changes …
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New modalities of strain-based engineering of ferroelectrics: domain structure and properties of PbZr1-xTixO3 thin films
Epitaxial strain has been widely used to modify the crystal and domain structure, and ultimately the dielectric, ferroelectric, and pyroelectric responses of ferroelectric thin-films for a wide variety of applications including memories, transducers, energy harvesters, sensors, and many more. …
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A multiscale study on the origins of the Portevin-Le Chatelier effect in polycrystalline nickel-based superalloys
Various engineering alloys display load drops and strain localisation during constant strain rate tensile testing, termed the Portevin-Le Chatelier (PLC) effect. This includes nickel-based superalloys, between approximately 200 °C and 600 °C. The PLC effect is widely attributed to Dynamic Strain …
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Atomic structure and defects of III-V compound semiconductor strained-layer-superlattices for infrared detection
… Devices based on the InAs/GaSb or InAs/InAsSb strained-layer-superlattices (SLSs) have gained special attention as the next generation IR photodetectors for replacing current technology based on mercury cadmium telluride. When in contact, InAs and GaSb (or InAs and InAsSb) forms the broken-band …
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Investigating the Effect of Austenite Grain Size and Grain Boundary Character on Deformation Twinning Behavior in A High-Manganese TWIP Steel: A TEM In-Situ Deformation Study
… grain boundaries. On the other hand, localized strain concentration causes the nucleation of deformation twins at grain boundaries regardless of the grain boundary misorientation character in UFG TWIP steel. The invisibility of stacking fault (zero contrast) was also observed to be emitted at …
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In-situ Characterization and Machine Learning Applications for Composite Processing
… structures. However, the rapid temperature and strain fluctuations experienced during the processing gives rise to a multitude of defects and residual stresses in the composite. In this study, we have devised an in-situ methodology that leverages Digital Image Correlation (DIC) and Machine …
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In-Situ Investigations of Calcium-Magnesium-Aluminosilicates (CMAS) Infiltration Effects on Thermal Barrier Coatings Under Extreme Environments Replicating Jet Engines
… and quantified by immediate changes in strain that reveal the thermomechanical effects of stiffening. Meanwhile, thermochemical destabilization of the coating, responsible for enabling the tetragonal to monoclinic phase transformation upon cooling, produced a discernible strain response …