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Dissertations / Theses on the topic 'Non-linear Deformation'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Laing, Kara Louise. "Non-linear deformation of a helical spring." Thesis, University of East Anglia, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323220.

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2

Sturm, Chris, Marcel Wille, Jörg Lenzner, Sherzod Khujanov, and Marius Grundmann. "Non-linear optical deformation potentials in uniaxially strained ZnO microwires." American Institute of Physics, 2017. https://ul.qucosa.de/id/qucosa%3A23556.

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The emission properties of bent ZnO microwires with diameters ranging from 1.5 μm to 7.3 μm are systematically investigated by cathodoluminescence spectroscopy at T ≈ 10 K. We induced uniaxial strains along the c-axis of up to ±2.9 %. At these high strain values, we observe a nonlinear shift of the emission energy with respect to the induced strain, and the magnitude of the energy shift depends on the sign of the strain. The linear and non-linear deformation potentials were determined to be D1=−2.50±0.05 eV and D2=−15.0±0.5 eV, respectively. The nonlinearity of the energy shift is also refle

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3

Vernazza, Niccolo. "Non-linear integral equations for the finite size effects in the integrable deformation of the quantum o(3) non-linear sigma model." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5674/.

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4

Teklemariam, Daniel Mekonnen, and Bennie Hamunzala. "Design of Thick Concrete Beams : Using Non-Linear FEM." Thesis, KTH, Bro- och stålbyggnad, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-189141.

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The experimental studies performed on the behaviour of very thick concrete beams subjected to static loads have revealed that the shear mechanisms play an important role in the overall response and failure behaviour. The aim of this thesis is to recommend suitable design methods for thick concrete beams subjected to off-centre static concentrated load according Eurocode 2 by using non-linear finite element analysis (NLFEA). To achieve this task, Abaqus/Explicit has been used by employing constitutive material models to capture the material non-linearity and stiffness degradation of concrete. C

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5

McMahon, Brendan. "Deformation mechanisms beneath shallow foundations." Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/244367.

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Shallow foundations can provide the most economical solution for supporting small-scale structures. The design approach is quite simple considering the ultimate bearing capacity and working-load settlement. Research has shown that settlement calculations, determined using a linear-elastic approach, usually govern the design but this approach is inappropriate because soil is highly non-linear, even at small strains. The result is that signifi cant discrepancies are observed between predicted and actual settlements. This uncertainty has seen the development of settlement-based approaches such as

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6

Lopez-Pedrosa, Magdalena. "An Analysis of Microstructure Evolution in Hot Worked Aluminium Subjected to Non-linear Deformation." Thesis, University of Sheffield, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485889.

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Accurate predictions of the microstructure evolution of thennomechanically processed metals and alloys are generally only achieved when the defonnation process is nominally linear. This is not surprising since most microstructure prediction models are only described in tenns of strain, strain rate and temperature and the testing methods (e.g. axisymmetric compression, plane strain compression and torsion testing) used to calibrate the underlying equations are linear unidirectional tests. However, there are many reported examples of microstructure evolution being strain path sensitive, particul

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7

Zhou, Zhengming. "Non-linear elastic modelling of coupled deformation, heat, air and moisture transfer in unsaturated soil." Thesis, Cardiff University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360637.

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8

Ober, Thomas J. (Thomas Joseph). "Role of viscoelasticity and non-linear rheology in flows of complex fluids at high deformation rates." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/85532.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2013.<br>Some pages printed landscape orientation. Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 365-399).<br>We combine pressure, velocimetry and birefringence measurements to study three phenomena for which the fluid rheology plays a dominant role: 1) shear banding in micellar fluids, 2) extension-dominated flows in microfluidic devices, and 3) flow-induced particle migration in microchannels. Firstly, worm-like micellar solutions are model non-Newtonian fluids h

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9

Link, David John. "BOOTSTRAP ENHANCED N-DIMENSIONAL DEFORMATION OF SPACE WITH ACOUSTIC RESONANCE SPECTROSCOPY." UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_diss/728.

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Acoustic methods can often be used with limited or no sample preparations making them ideal for rapid process analytical technologies (PATs). This dissertation focuses on the possible use of acoustic resonance spectroscopy as a PAT in the pharmaceutical industry. Current good manufacturing processes (cGMP) need new technologies that have the ability to perform quality assurance testing on all products. ARS is a rapid and non destructive method that has been used to perform qualitative studies but has a major drawback when it comes to quantitative studies. Acoustic methods create highly non lin

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10

Jatulis, Donatas. "Masts with combined guys: analysis and control of stress and deformation." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080814_090720-22645.

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Тhe dissertation deals with the problem of telecommunication masts efficiency. The subject of research – masts of a new structure with combined guys under static loads. The study deals with constructive forms and analysis methods of up-to-date masts. It analyses into a created structure of the mast, wherein it is suggested to apply combine guys instead of the ordinary ones. Engineering guyed masts with combined guys static analysis method is given this research. The numerical and experimental laboratory assay of a new mast under static loads behaviour is given. It is proposed in the study to a

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11

Amirova, Svetlana R. "The influence of a simple shear deformation on a long wave motion in a pre-stressed incompressible elastic layer." Thesis, Keele University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491831.

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12

Sakamoto, Ryo. "Detection of Time-Varying Structures by Large Deformation Diffeomorphic Metric Mapping to Aid Reading of High-Resolution CT Images of the Lung." Kyoto University, 2014. http://hdl.handle.net/2433/189353.

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13

Borukhovich, Efim [Verfasser], Ingo [Akademischer Betreuer] Steinbach, and Ulrich [Akademischer Betreuer] Köhler. "Consistent coupling of geometrically non-linear finite deformation with alloy chemistry and diffusion within the phase-field framework / Efim Borukhovich. Gutachter: Ingo Steinbach ; Ulrich Köhler." Bochum : Ruhr-Universität Bochum, 2016. http://d-nb.info/1099703247/34.

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14

Shamass, Rabee. "Numerical and analytical investigation into the plastic buckling paradox for metal cylinders." Thesis, Brunel University, 2017. http://bura.brunel.ac.uk/handle/2438/14235.

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It is widely accepted that, for many buckling problems of plates and shells in the plastic range, the flow theory of plasticity either fails to predict buckling or significantly overestimates buckling stresses and strains, while the deformation theory, which fails to capture important aspects of the underlying physics of plastic deformation, provides results that are more in line with experimental findings and is therefore generally recommended for use in practical applications. This thesis aims to contribute further understanding of the reasons behind the seeming differences between the predi

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15

Gunel, Murat. "Linear And Nonlinear Progressive Failure Analysis Of Laminated Composite Aerospace Structures." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12614033/index.pdf.

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This thesis presents a finite element method based comparative study of linear and geometrically non-linear progressive failure analysis of thin walled composite aerospace structures, which are typically subjected to combined in-plane and out-of-plane loadings. Different ply and constituent based failure criteria and material property degradation schemes have been included in a PCL code to be executed in MSC Nastran. As case studies, progressive failure analyses of sample composite laminates with cut-outs under combined loading are executed to study the effect of geometric non-linearity on the

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16

Duro, Javier. "Development of new methodologies for the detection, measurement and on going monitoring of ground deformation using spaceborne SAR data." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00638089.

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Persistent Scatterer Interferometric techniques are very powerful geodetic tools for land deformation monitoring that offer the typical advantages of the satellite remote sensing SAR (Synthetic Aperture Radar) systems : a wide coverage at a relatively high resolution. Those techniques are based on the analysis of a set of SAR images acquired over a given area. They overcome the decorrelation problem by identifying elements (in resolution cells) with a high quality returned SAR signal which remains stable in a series of interferograms. These techniques have been useful for the analysis of urban

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17

Boucard, Pierre-Alain. "Approche à grand incrément de temps en grandes transformations." Cachan, Ecole normale supérieure, 1996. http://www.theses.fr/1996DENS0006.

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L'étude des problèmes statiques en grandes transformations suppose la résolution d'équations non linéaires ou les non linéarités sont d'origine physique et géométrique. Les méthodes usuelles de calcul sont basées sur la méthode incrémentale en sollicitation et nécessitent l'utilisation de techniques de type Riks ou Crisfield pour franchir les points d'instabilité. L'approche utilisée dans ce travail s'en différencie sur deux points. Tout d'abord nous exploitons une reformulation matérielle du problème en grandes transformations qui, utilisant des grandeurs tournées par la rotation locale, perm

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18

Strandell, Gustaf. "Linear and Non-linear Deformations of Stochastic Processes." Doctoral thesis, Uppsala : Matematiska institutionen, Univ. [distributr], 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3689.

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19

Christensen, J. "Topology optimisation of structures exposed to large (non-linear) deformations." Thesis, Coventry University, 2015. http://curve.coventry.ac.uk/open/items/7c0729ce-e19c-414c-9542-c39527d54752/1.

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PhD by portfolio. Research aim: To investigate if topology optimisation can be used for the development of mechanical structures exposed to large (non-linear) deformations. Research objectives: 1. Analyse and critically evaluate the potential for using state of the art commercially available Finite Element software (and associated topology optimisation algorithms) for topology optimisation of structures exposed to large-deformations. 2. Based on 1 (where feasible) suggest, develop and critically appraise opportunities, methodologies and tools for enhancing the accuracy and precision of current

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20

Oliver, Serna Clara. "Vibroacoustic analysis of car door and window seals." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC023.

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Les joints de porte et de vitrage des voitures jouent un rôle très important dans la réduction du bruit d’origine aérodynamique, à la fois par transmission directe et de par son rôle en tant que condition limite ees autres éléments transmetteurs (portes et fenêtres). Par conséquent, sa conception est fondamentale pour l’optimisation du confort de passager. Néanmoins, la méthode traditionnelle pour sa conception, basée sur une approche par tâtonnement de tests en soufflerie, est très coûteuse et insuffisante. Une approche différente est envisagée dans ce manuscrit, par la création d’un modèle c

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21

Ren, Honghao. "Experimental and numerical analysis of orthotropic deformations of wood using Finite Strain Theory (large deformations) and the Finite Element Method (FEM) in 2D." Thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-104778.

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This thesis involves the derivation of a constitutive model under large deformationtheory using Updated Lagrange method applied on an orthotropic material.Thefollowing aspects are included in this thesis work: introduction, theory, FEM implementation, derivation of constitutive model, calibration, result, discussion, conclusion and the future work. This thesis studies the deformation behavior of wood, which is widely used as aconstruction material, in an advanced and more detailed way by analyzing the mechanical properties of wood from both, the application in laboratory and theoreticalcalcula

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22

Vasudevan, S. "Development of new spatially curved non-linear frame finite element using a mixed variational principle and rotations as independent variables." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/13069.

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23

Kawaguchi, Io. "Integrable deformations of principal chiral models and the AdS/CFT correspondence." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188477.

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24

Dressler, Bernhard. "Modélisation numérique des coques en grandes transformations : mise en oeuvre dans un environnement orienté objet." Châtenay-Malabry, Ecole centrale de Paris, 1997. http://www.theses.fr/1997ECAP0522.

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Ce mémoire est consacré à la dynamique des coques en grandes rotations. La théorie bidimensionnelle des coques est déduite du principe des travaux virtuels d'un milieu continu tridimensionnel en introduisant la cinématique de Mindlin. On obtient un système d'équations non-linéaires qui est linéarise par rapport aux déplacements de la surface moyenne ainsi que par rapport aux paramètres de rotation. La paramétrisation des grandes rotations par le vecteur de rotation est comparée à la paramétrisation directe par la matrice de rotation. En vue d'une discrétisation en éléments finis isoparamétriqu

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25

Novák, Kamil. "Analýza zbytkových napětí ve stěně tepny." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230942.

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This thesis deals with computational modeling of the influence of residual stresses in idealized geometry of blood vessels and subsequent application of acquired knowledge to abdominal aortic aneurysm. In the terms of quality of the computational model, we reduced the uncertainties that are included in the computational model without considering the influence of residual stresses. The basic assumption of homogenization significant peaks of the stress between inner and outer vessel wall was met for each level of the computational model Methods that have been used are: deformation method (openin

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26

Sun, Chien-Ting, and 孫健庭. "Reproducing Kernel Particle Method with High Order Nodal Integration for Non-linear Deformation of Plate." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/71010474142230170448.

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碩士<br>國立臺灣海洋大學<br>系統工程暨造船學系<br>101<br>Meshfree methods (MMs) recently have become a popular research area in numerical analysis. By improving some drawback of general Finite Element Methods (FEM), MMs have a wide range of applications and several meshfree methods have been proposed. In this study, we applied Reproducing Kernel Particle Method (RKPM) for analysis of Hull deformation in ship structure. RKPM has improved the consistency condition in the Smoothed Particle Hydrodynamics (SPH). That makes RKPM more suitable for various engineering problems. The Hull has complex geometry in the three

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27

Laubscher, Abraham Johannes. "Simulation of the deformation of a stope support design / Abraham Johannes Laubscher." Thesis, 2014. http://hdl.handle.net/10394/11736.

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Supported stope mining is one of the most common types of mining in the modern day gold mining industry. The excavated regions, where ore is extracted, are supported with a combination of roof-bolting, timber packs, backfill, timber props and mechanical prop technologies. In order to install a support system that will be able to absorb the energy released by the elastic movement of the surrounding rock mass and support the unstable hanging wall, it is necessary for the rock engineer to know how the individual types of support will react to different load conditions in order to design a safe su

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28

Numrich, Ralf [Verfasser]. "Modellierung des nichtlinear-elastischen Verformungsverhaltens von Tragschichten ohne Bindemittel = Modelling of the non-linear elastic deformation behaviour of unbound granular materials / von Ralf Numrich." 2003. http://d-nb.info/970204736/34.

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29

"Deformations with non-linear constraints." 2013. http://library.cuhk.edu.hk/record=b5549277.

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於參數化和特徵模型的變形中保持幾何特徵是CAD建模中一項新的挑戰。這篇論文提出了一個以限制為基礎去進行變形的系統。此系統結合了自由曲面和特徵模型建模的好處，而且容許更自由的工程設計。<br>本方法可分為三個主要步驟。以常用的變形技術去改變一個模型的形狀，包括自由變形及軸向變形，然後參數特徵會根據用戶的要求去分拆為一系列基本的限制，最後目標特徵將會以逐步增量的優化技術去重建。<br>這篇論文提出了一個逐步增量的方法為優化中提供導引。這個優化是於維持所有提供的限制下盡量減少變形後模型的改變。另外，於一組的限制中以一個基准為參考，能使本系統更有效的運行。最後，我們也會展示一些使用本系統以限制為基礎去進行變形的結果。<br>To retain geometric features in the deformation of a parametric and feature-based model is a new challenge for CAD modeling. This thesis presents a constraints based deformation framework. This framework combines the advantage of free-form modeling with feature based modeling, and allows

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30

Carvalho, Cristiano Daniel Ferreira. "Simulação numérica e verificação experimental do comportamento elástoplástico de espumas metálicas." Master's thesis, 2012. http://hdl.handle.net/1822/22706.

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Dissertação de mestrado integrado em Engenharia Mecânica<br>Esta dissertação de mestrado analisa o comportamento elásto-plástico de espumas metálicas à compressão, através do estudo numérico e da verificação experimental. No estado da arte são apresentados vários processos de fabrico de espumas metálicas, são apresentadas algumas propriedades mecânicas e físicas das espumas metálicas e alguns estudos numéricos realizados a espumas deste tipo. Foram realizados ensaios experimentais de tração a provetes com o mesmo material utilizado nas espumas, que possibilita delinear o perfil deste mat

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31

"Deformations and motions in compressible non-linear elasticity." Thesis, 2010. http://hdl.handle.net/1911/61996.

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The primary purpose of this study is to identify solutions for deformations and motions in compressible non-linear elasticity. The research study mainly focuses on the mathematical theory of deformations and motions of non-linearly elastic compressible hollow spheres and hollow cylinders reinforced with inextensible fibers in the radial direction. Static and dynamic solutions for both unstressed and everted cases are presented for the hollow spheres and hollow cylinders of isotropic elastic materials that are radially inextensible. Different strain energy density functions are then applied for

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32

Silva, Bruno Alexandre Esperança Sepúlveda da. "Optimização do comportamento dos sistemas de ligação nas barreiras de protecção das estradas." Master's thesis, 2011. http://hdl.handle.net/1822/21708.

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Dissertação de mestrado integrado em Engenharia de Mecânica<br>A presente tese de mestrado expõe o estado da arte das barreiras de protecção rodoviária, com incidência mais profunda nas barreiras metálicas mais usuais, área de estudo deste trabalho. De modo a executar uma análise fidedigna, é descrita previamente a curva do material, obtida experimentalmente, que posteriormente é tratada de modo a obter a curva verdadeira do material para introdução no programa. As análises executadas são de cariz estático, estudando de forma individual estes dois elementos. Como se pretende verificar o

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33

Tavares, João André Curralo. "Simulação numérica do comportamento ao impacto de estruturas utilizadas em segurança rodoviária." Master's thesis, 2012. http://hdl.handle.net/1822/22686.

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Dissertação de mestrado integrado em Engenharia Mecânica<br>Esta dissertação de mestrado aborda a temática das barreiras de segurança rodoviária, com especial foco na viga central (rail) que as compõe. É apresentado um estado da arte composto por diversas informações relativas à composição base destes sistemas de segurança, bem como alguns estudos efetuados na área com recurso a softwares de análise. Com o intuito de estudar o comportamento plástico da viga, foi utilizado o programa Ansys Workbench na sua componente de estudos estruturais estáticos. De forma a validar a utilização deste

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34

Weischedel, Clarisse. "A discrete geometric view on shear-deformable shell models." Doctoral thesis, 2012. http://hdl.handle.net/11858/00-1735-0000-000D-F06B-C.

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