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 118 for “"Twinning"”.
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Twinning and nonlinear optics
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1984.
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Crystal plasticity due to slip and twinning
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
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Effects of periconceptional undernutrition and twinning on ovine pregnancy
… conception such as maternal undernutrition and twinning may have effects on offspring physiology and disease risk in adulthood. Periconceptional undernutrition alters offspring physiology and adult pathology without affecting birth size, while twinning affects birth size and physiology but with …
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Atomistics of defect nucleation and mobility : dislocations and twinning
… of interest being dislocations and deformation twinning, and emphasis on the atomistic mechanisms and measures. The contributions presented in the thesis may be regarded as advances in both methods development and mechanistic understanding of dislocation mobility and twinning nucleation. For …
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Energetic Considerations and Structural Characterization of Twinning in Nanowires
… these unique phenomena and properties that the twinning can bring to the materials, it is of interest to investigate the formation of twins. Our primary objective in this dissertation is to study twinning in nanowires. Both gold and platinum <111> oriented nanowires were fabricated by similar …
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Threat-Analysis Oriented Digital Twinning of ML-Powered Future Autonomous Weapon Systems
<p>Warfare is undergoing a rapid transformation with the integration of artificial intelligence (AI) and machine learning (ML) into autonomous weapon systems (AWS) for perception, decision support, and control. As these systems become more software-defined, their cyber attack surface expands across …
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Dislocation slip and twinning stress in shape memory alloys- theory and experiments
Slip and twinning are two important deformation mechanisms governing Shape Memory Alloys (SMAs) plasticity, which results in affecting their pseudoelasticity and shape memory performance. Precisely determining Peierls stress in dislocation slip and critical twin nucleation stress in twinning is …
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The Role of Twinning in the Plastic Deformation of Alpha Phase Titanium
… a better understanding of how deformation twinning interacts with microstructural features in titanium alloys is required, because such twinning facilitates plastic deformation at a higher strain rate than dislocations. To investigate this behaviour, commercial purity titanium and the …
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Building information modelling technologies for intelligent road engineering design, construction and digital twinning
Submitted in fulfillment of the academic requirements for the degree of Master of Engineering in Civil Engineering and Geomatics, Durban University of Technology, Durban, South Africa, 2023.
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Model-Based Systems Engineering for an Aircraft Design Process driven by Digital Twinning
L'abstract è presente nell'allegato / the abstract is in the attachment
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Shear-induced homogeneous deformation twinning in FCC aluminum and copper via automistic simulation
The {111}<112̄> shear stress-displacement behavior for face-centered cubic (fcc) metals, aluminum and copper, is calculated using empirical potentials proposed by Mishin and by Ercolessi, based on the embedded atom method (EAM), and compared with published ab initio calculations. In copper close …
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Outcomes of Trans-border Spatial Development Cooperation: Insights from Musina and Beitbridge Twinning Agreement
… development cooperation with respect to a twinning agreement signed between the Musina local municipality, South Africa, and the Beitbridge Rural District Council, Zimbabwe in October 2004. It unpacks to the extent to which the twinning agreement objectives were achieved in terms of spatial …
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Critical stresses for twinning, slip and transformation in shape memory alloys: modeling and experiments
… parameters-(i) transformation stress (ii) twinning stress (iii) austenite slip stress and (iv) martensite slip stress that govern shape memory and superelastic behavior in shape memory alloys (SMAs). However, it is a tremendous experimental effort to determine these parameters for multiple …
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Effect of nano-scale twinning on the fracture, fatigue and wear properties of copper
Grain refinement in materials has been one of the most common strategies for improving the strength of materials. However this comes at the price of reduced ductility, fracture toughness and stable fatigue crack propagation life. It has been shown that controlled introduction of nano scale growth …
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Refurbishment of UK state school buildings: A strategy and framework for BIM-based Digital Twinning
… a digital built Britain in which digital twinning (DT) - using the CDBB’s ‘Gemini’ principles, would capture the synergies between physical assets and their virtual equivalents for adding sustainable value to projects. However, both BIM and DT suffer from an absence of a strategic approach …
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Modeling of twinning as a deformation mechanism in iron (bcc) crystals and iron-based alloys
… We minimize the total energy to predict the twinning stress relying only on parameters that are obtained through atomistic calculations, thus excluding the need for any empirical constants. We validate the present approach by means of precise measurements of onset of twinning in bcc Fe50Cr …
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Automating the Generation of Geometric Information Models to Support Digital Twinning of Existing Rail Infrastructure
… cloud data is a fundamental step of the digital twinning process for rail infrastructure. Currently, this onerous procedure outweighs the anticipated benefits of the resulting model and expends 74% of the modellers’ effort on converting point cloud data to a model. This is particularly true for …
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Defect mediated plasticity in Cu/Ag nanoscale multilayered metal composites: deformation twinning and wavy interface formation
Made available in DSpace on 2013-08-22T16:35:38Z (GMT). No. of bitstreams: 4 Ruizhi_Li.pdf: 2616507 bytes, checksum: dff899bcd8bac69b54dbea75d994edac (MD5) 0_Li_Ruizhi.docx: 28848935 bytes, checksum: 4c460173b168128b9fb90f0828607c49 (MD5) Li_Ruizhi.docx: 28848935 bytes, checksum: …
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Effects of In Vitro Maturation and Fertilization of Cattle Ova on Rate of Twinning in Beef Cattle
… fertilized embryos in embryo transfer to induce twinning and examine the influence of twinning on cow production and carcass characteristics between single and twin calves. Fifteen single parity cows were estrus synchronized using the synthetic hormone implant Synchromate-B and ten first-calf …
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Experimental Characterization of Heterogeneous Deformation Due to Phase Transformations, Twinning, and Slip Deformation Using Digital Image Correlation
… hysteretic behavior, the strain-rate dependence, twinning strain, twin-twin intersections, twin fraction evolution, dynamic strain aging, grain interactions, mesoscopic slip bands, and a RVE size.
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