Relevant bibliographies by topics / Material nonlinearity / Dissertations / Theses
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Dissertations / Theses on the topic 'Material nonlinearity'

Author: Grafiati
Published: 4 June 2021
Last updated: 26 July 2025

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1

Collison, Ian J. "Measurement of material nonlinearity using laser ultrasound." Thesis, University of Nottingham, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493344.

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2

Bhave, Tejas N. "Effect of Material Nonlinearity on Rubber Friction." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou14798628516789.

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3

Haller, Kristian. "Acoustical measurements of material nonlinearity and nonequilibrium recovery /." Karlskrona : Department of Mechanical Engineering, Blekinge Institute of Technology, 2008. http://www.bth.se/fou/Forskinfo.nsf/allfirst2/94a574222b06e477c12574bb0045a567?OpenDocument.

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4

Braun, Michael Rainer. "Characterization of nonlinearity parameters in an elastic material with quadratic nonlinearity with a complex wave field." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26566.

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Thesis (M. S.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Jacobs, Laurence; Committee Co-Chair: Qu, Jianmin; Committee Member: DesRoches, Reginald. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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5

Wu, Yuan-Yen. "Optical Nonlinearities in Semiconductors for Limiting." Thesis, University of North Texas, 1990. https://digital.library.unt.edu/ark:/67531/metadc331203/.

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I have conducted detailed experimental and theoretical studies of the nonlinear optical properties of semiconductor materials useful for optical limiting. I have constructed optical limiters utilizing two-photon absorption along with photogenerated carrier defocusing as well as the bound electronic nonlinearity using the semiconducting material ZnSe. I have optimized the focusing geometry to achieve a large dynamic range while maintaining a low limiting energy for the device. The ZnSe monolithic optical limiter has achieved a limiting energy as low as 13 nJ (corresponding to 300W peak power) a
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6

Thiele, Sebastian. "Air-coupled detection of Rayleigh surface waves to assess material nonlinearity due to precipitation in alloy steel." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50276.

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Nonlinear ultrasonic waves have demonstrated high sensitivities to various microstructural changes in metal including coherent precipitates; these precipitates introduce a strain field in the lattice structure. The thermal aging of certain alloy steels leads to the formation of coherent precipitates, which pin dislocations and contribute to the generation of a higher harmonics in an initially monochromatic wave. The objective of this research is to develop a robust technique to perform nonlinear Rayleigh wave measurements in metals using a non-contact receiving transducer. In addition a discu
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7

Kuechler, Sebastian. "Wave Propagation in an Elastic Half-Space with Quadratic Nonlinearity." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19823.

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This study investigates wave propagation in an elastic half-space with quadratic nonlinearity due to a line load on the surface. The consideration of this problem is one of the well known Lamb problems. Even since Lamb's original solution, numerous investigators have obtained solutions to many different variants of the Lamb problem. However, most of the solutions existing in the current literature are limited to wave propagation in a linear elastic half-space. In this work, the Lamb problem in an elastic half-space with quadratic nonlinearity is considered. For this, the problem is first formu
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8

Лісовець, С. М. "Особливості контролю міцністних властивостей конструкційних матеріалів засобами нелінійної акустики". Thesis, Національний технічний університет України "Київський політехнічний інститут імені Ігоря Сікорського", 2020. https://er.knutd.edu.ua/handle/123456789/16524.

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Пропонуються засоби контролю конструкційних матеріалів пакетами пружних коливань, що за рахунок акустичної структурної нелінійності таких матеріалів дає мо-жливість проводити їх ранню діагностику.<br>Means for monitoring structural materials by packages of elastic vibrations are pro-posed, which, due to the acoustic structural nonlinearity of such materials, allows their early diagnosis.
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9

Metin, Tolga. "A Parametric Study On The Influence Of Semi-rigid Connection Nonlinearity On Steel Special Moment Frames." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615725/index.pdf.

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In practice, steel frames are analyzed and designed by assuming all beam to column connections as either rigid or simple. In real life, there are no such idealizations as rigid or simple and all connections would actually belong to a group of connections named as semi rigid connections. Various difficulties exist in modeling an accurate non-linear behavior of a steel structure, where one of these challenges is the modeling of semi-rigid behavior of connections. A detailed finite element model would take into account the complex interaction between all surfaces due to contact, friction and bolt
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10

Lu, Xuzhao. "Nonlinear Seismic Responses of High-Speed Railway System considering Train-Bridge Interaction." Doctoral thesis, Kyoto University, 2020. http://hdl.handle.net/2433/253254.

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京都大学<br>0048<br>新制・課程博士<br>博士(工学)<br>甲第22418号<br>工博第4679号<br>新制||工||1730(附属図書館)<br>京都大学大学院工学研究科社会基盤工学専攻<br>(主査)教授 KIM Chul-Woo, 教授 清野 純史, 教授 杉浦 邦征<br>学位規則第4条第1項該当<br>Doctor of Philosophy (Engineering)<br>Kyoto University<br>DFAM
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11

Waidemam, Leandro. "Formulação do método dos elementos de contorno para placas enrijecidas considerando-se não-linearidades física e geométrica." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-10092008-102729/.

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Este trabalho tem como objetivo principal apresentar formulações do método dos elementos de contorno que contemplem as análises de placas considerando-se as não-linearidades física e geométrica e de placas enrijecidas considerando-se o comportamento não-linear físico do material. As equações integrais utilizadas são baseadas na teoria de Kirchhoff para flexão de placas delgadas, sendo o efeito não-linear geométrico modelado a partir da teoria de Von Kármán. Os efeitos não-lineares físicos são introduzidos no sistema a partir da consideração de um campo de tensões iniciais, com a avaliação das
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12

Gu, Wenjiong. "Holonomic Elastoplastic Truss Design Using Displacement Based Optimization." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/35508.

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A Displacement Based Optimization (DBO) approach was applied to truss design problems with material nonlinearities, to explore feasibility and verify efficiency of the approach to solve such problem. Various truss sizing problems with holonomic (path-independent) elastoplastic laws were investigated. This type of material nonlinearity allows us to naturally extend the linear elastic truss sizing in the DBO setting to nonlinear problems. A computer program that uses the commercially available optimizer DOT by VR&D and IMSL Linear Programming solver by Visual Numerics was developed to solve t
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13

Rozsypalová, Veronika. "Výpočet plastické únosnosti desek." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226457.

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The subject of this thesis is analysis of the plastic bearability of plates. The first part is dedicated to a description of pertinent theories. It is primarily a theory of material nonlinearity and plasticity, including a description of plasticity models, which are commonly used in engineering analysis. Next is the hinted theory of geometric nonlinearity and discusses the key principles of limit plastic bearability of plates. This thesis includes ultimate strength calculations of plates of selected shapes, their solution by both, a manual calculation and using computational software. The obta
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14

Paula, Cristina Ferreira de. "Contribuição ao estudo das respostas numéricas não-lineares estática e dinâmica de estruturas reticuladas planas." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-31032016-164210/.

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O trabalho trata da formulação e implementação numérica de modelos matemáticos do comportamento de estruturas considerando-se as não-linearidades física e geométrica. O equilíbrio na posição deslocada é formulado via Princípio dos Trabalhos Virtuais, empregando-se o método dos elementos finitos para a discretização espacial das estruturas e busca de soluções aproximadas. Inicialmente destaca-se com base no caso de treliças planas o emprego de medidas de deformação e tensão conjugadas energeticamente. Particularizando-se a formulação geral do equilíbrio para os pórticos planos apresenta-se uma
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15

Yan, Guqi. "Zero-group-velocity Lamb modes in laser ultrasonics : fatigue monitoring and material characterization." Thesis, Le Mans, 2018. http://www.theses.fr/2018LEMA1026/document.

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Ces dernières années, les modes de Lamb à vitesse de groupe nulle (ZGV) se sont révélés être un outil efficace pour sonder localement et précisément l'épaisseur d'un échantillon ou les propriétés mécaniques de matériaux isotropes ou anisotropes. Ce type particulier d'ondes guidées, telles de fortes résonances locales de la structure, résulte de l'interférence de deux ondes de Lamb ayant une vitesse de phase opposée et coexistant pour un couple fréquence-nombre d'ondes particulier. Les ultrasons laser ont démontré leur capacité à générer et détecter efficacement de t
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16

Silva, Aline Alessandra Eduarda Farias da. "CONTRIBUIÇÕES AO ESTUDO DA NÃO-LINEARIDADE FÍSICA EM VIGAS DE CONCRETO ARMADO." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/7799.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This work refers to consideration of the effects of material nonlinearity applied to the behavior of reinforced concrete beams subjected to simple bending. The importance of the topic is highlight, as well as several works stemming from this study. The nonlinear behavior of steel and concrete are described along with understanding the manifestation of material nonlinearity. The constitutive models discussed and used in structural analysis are based on moment-curvature diagrams. The types of analysis and the approximate methods of t
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17

Kabeláč, Jaromír. "Materiálově nelineární řešení prutových konstrukcí." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-355602.

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The dissertation deals with solution of beam and frame structure considering material nonlinearity. The finite elements method (FEM) was used as calculation method. The objective of the dissertation was to develop and test finite beam element considering material nonlinearity. A detailed analysis of the problem provided a group of formulations of beam element. Part of the dissertation´s results has been, in several forms, implemented in commercial software. Beam element focused on solution of stress over solid cross sections is introduced in the theoretical part. In terms of topology it is a c
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18

Morel, Osman Fuat. "Earthquake Performance Of Un-stiffened Thin Steel Plate Shear Walls." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1260427/index.pdf.

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In this study two dimensional steel frames, reinforced with un-stiffened thin steel panels, are investigated. In the first part of the study, the strip model, a method for analyzing un-stiffened thin steel plate shear walls, was investigated. Sensitivity studies to investigate the influence of the number of strip members to be used to in the strip model and their angle of inclination were conducted. In the second part, responses of various un-stiffened steel plate shear wall systems to lateral loads were investigated. The influences of three major parameters were studied. These are the beam
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19

BARALDI, Daniele. "Nonlinear analysis of structures on elastic half-space by a FE-BIE approach." Doctoral thesis, Università degli studi di Ferrara, 2013. http://hdl.handle.net/11392/2388909.

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In the present dissertation, a numerical model able to study the non-linear behaviour of structures on elastic half-space is presented. The work takes into account for first the geometric non-linearity of beams and frames on elastic half-plane, namely in plane strain or plane stress condition. This problem is important in many engineering fields and it has been studied in the past by many researchers for the design of sandwich panels in aerospace industry. Recently, this problem has been studied in relation to the buckling of thin films on elastic supports for electronic design. The prob
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20

Silva, Ana Rita Cordeiro da. "Uma abordagem probabilista da ruptura de painéis tracionados de concreto de granulometria fina armados com telas soldadas." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-18072006-145508/.

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A resistência à ruptura de materiais frágeis como o concreto de granulometria fina é fortemente dependente de sua heterogeneidade, do tamanho da amostra e da heterogeneidade das tensões. A partir de uma abordagem probabilista, fundamentada no modelo de Weibull, este trabalho trata da influência de tais efeitos sobre a resistência à tração de painéis compósitos formados por concreto de granulometria fina e telas soldadas. Desde que as armaduras se mantenham em regime elástico, mostra-se que o modelo de Weibull de dois parâmetros pode ser empregado com sucesso na previsão da ruptura dos painéis
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21

Hjalmarsson, Joel, and Anes Memic. "FE Analysis of axial-bearing in large fans : FE analys av axialkullager i stora fläktar." Thesis, Linnaeus University, School of Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-6663.

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<p>Detta examensarbete har utförts på Fläktwoods AB i Växjö, som producerar stora axialfläktar för olika industriapplikationer. Syftet är att öka kunskapen om fettsmorda axiella kullager genom FE analyser.</p><p>Projektet har genomförts i fem delsteg för att avgöra påverkan av en eller några få parametrar i taget. De studerade parametrarna är: elementstorlek, kontaktstyvhet, last, lagergeometri (dvs. oskulation), ickelinjär geometri och ickelinjära materialegenskaper (dvs. plasticitet).</p><p>Slutsatsen är att elementstorleken bör väljas fint nog för att ge ett jämnt resultat men grovt nog för
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22

Wu, Meng-Chou. "Nonlinearity parameters of polymers." W&M ScholarWorks, 1989. https://scholarworks.wm.edu/etd/1539623784.

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Three types of acoustic nonlinearity parameters for solids are discussed. The results of measurements of these parameters for three polymers--polymethyl methacrylate, Polystyrene, and polysulfone--are presented.;The author has developed a new technique, using piezoelectric transducers directly bonded to the specimens, which allows the measurements of fundamental and second harmonics generated in the solids, and thereby the determination of nonlinearity parameter {dollar}\beta\sb3{dollar}, which is the ratio of a linear combination of second- and third-order elastic coefficients to the second-o
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23

Idjimarene, Sonia. "Power laws behavior and nonlinearity mechanisms in mesoscopic elastic materials." Phd thesis, Université du Maine, 2013. http://tel.archives-ouvertes.fr/tel-01037944.

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Nonlinear mesoscopic elastic (NME) materials present ananomalous nonlinear elastic behavior, which could not beexplained by classical theories. New physical mechanismsshould be individuated to explain NMEs response.Dislocations in damaged metals, fluids in rocks andadhesion (in composites) could be plausible. In this thesisI have searched for differences in the macroscopic elasticresponse of materials which could be ascribed to differentphysical processes. I have found that the nonlinearindicators follow a power law behavior as a function of theexcitation energy, with exponent ranging from 1 t
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IDJIMARENE, SONIA. "Power Laws Behavior and Nonlinearity Mechanisms in Mesoscopic Elastic Materials." Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2656351.

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Nonlinear mesoscopic elastic (NME) materials present an anomalous nonlinear elastic behavior, which could not be explained by classical theories. New physical mechanisms should be individuated to explain NMEs response. Dislocations in damaged metals, fluids in rocks and adhesion (in composites) could be plausible. In this thesis I have searched for differences in the macroscopic elastic response of materials which could be ascribed to different physical processes. I have found that the nonlinear indicators follow a power law behavior as a function of the excitation energy, with expon
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25

Hu, Honghua. "Third Order Nonlinearity of Organic Molecules." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5310.

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The main goal of this dissertation is to investigate the third-order nonlinearity of organic molecules. This topic contains two aspects: two-photon absorption (2PA) and nonlinear refraction (NLR), which are associated with the imaginary and real part of the third-order nonlinearity (x3) of the material, respectively. With the optical properties tailored through meticulous molecular structure engineering, organic molecules are promising candidates to exhibit large third-order nonlinearities. Both linear (absorption, fluorescence, fluorescence excitation anisotropy) and nonlinear (Z-scan, t
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26

Guo, Dandan. "Theory of optical nonlinearity in pi-conjugated polymers and related materials." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186192.

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Within the framework of interacting-electron models, the optical nonlinearity in π-conjugated polymers is investigated theoretically. A complete microscopic many-body theory is developed for the mechanism of the third order nonlinearity in these materials. The universality and the predictability of the theory are well established. It is found that the bulk of the optical nonlinearity in conjugated polymers is determined by four essential states although all the excited states are involved. It is also found that electron-electron Coulomb interactions in one-dimensional systems play key roles in
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27

Ao, Wai Kei. "Electromagnetic damping for control of vibration in civil structures." Thesis, University of Exeter, 2017. http://hdl.handle.net/10871/31145.

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This thesis investigates an alternative solution to deal with the civil structure vibration. Non-contact electromagnetic or Eddy current damping is selected as a score of vibration suppression. Electromagnetic damping relies on the interaction between a permanent magnet and conductor. An electromagnetic damper (EMD) is applied both to a laboratory footbridge structure and 6-storey model-scale aluminium moment resisting frame (AMRF). In this first study the EMD is connected in series with an electronic shunt circuit to construct an electromagnetic shunt damper (EMSD). A robust optimisation meth
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28

Pauly, Olivier. "Characterization of a three-phase medium with a large and negative parameter of nonlinearity." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/19081.

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29

Uhrig, Matthias Pascal. "Numerical simulation of nonlinear Rayleigh wave beams evaluating diffraction, attenuation and reflection effects in non-contact measurements." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54368.

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Although several studies have proven the accuracy of using a non-contact, air-coupled receiver in nonlinear ultrasonic (NLU) Rayleigh wave measurements, inconsistent results have been observed when working with narrow specimens. The objectives of this research are first, to develop a 3D numerical finite element (FE) model which predicts nonlinear ultrasonic measurements and second, to apply the validated model on the narrow waveguide to determine causes of the previously observed experimental issues. The commercial FE-solver ABAQUS is used to perform these simulations. Constitutive law and e
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30

Tran, Nhu Cuong. "Développement d'un modèle d'interface acier-béton à haute température : modélisation des structures en béton exposées au feu." Phd thesis, Université Paris-Est, 2011. http://pastel.archives-ouvertes.fr/pastel-00657207.

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Le comportement des structures en béton armé (BA) et en béton précontraint (BP) exposées au feu est une thématique de recherche importante en génie civil. Actuellement, le comportement de l'interface béton-acier à haute température et la simulation thermomécanique non linéaire des structures en béton sont des verrous à lever. Ces deux questions font l'objet de cette thèse. Après avoir fait un état de l'art sur le comportement à froid de l'interface béton-acier, un modèle à haute température est proposé ainsi que son intégration numérique dans le code de calcul ANSYS. Puis, les performances de
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31

Roy, Samit. "A finite element analysis of adhesively bonded composite joints including geometric nonlinearity, nonlinear viscoelasticity, moisture diffusion and delayed failure." Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/88624.

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A two-dimensional finite-element computational procedure is developed for the accurate analysis of the strains and stresses in adhesively bonded joints. The large displacements and rotations experienced by the adherends and the adhesive are taken into account by invoking the updated Lagrangian description of motion. The adhesive layer is modeled using Schapery's nonlinear single integral constitutive law for uniaxial and multiaxial states of stress. Effect of temperature and stress level on the viscoelastic response is taken into account by a nonlinear shift factor definition. Penetrant sorpti
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Bhargava, Aarushi. "Dynamics of smart materials in high intensity focused ultrasound field." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/97994.

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Smart materials are intelligent materials that change their structural, chemical, mechanical, or thermal properties in response to an external stimulus such as heat, light, and magnetic and electric fields. With the increase in usage of smart materials in many sensitive applications, the need for a remote, wireless, efficient, and biologically safe stimulus has become crucial. This dissertation addresses this requirement by using high intensity focused ultrasound (HIFU) as the external trigger. HIFU has a unique capability of maintaining both spatial and temporal control and propagating over l
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Dumortier, Alexis Jean Louis. "Investigation of a medium with a large, negative parameter of nonlinearity and its application to the enhancement of a compact, omnidirectional, parametric source." Thesis, Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-07022004-160330/unrestricted/kottke%5Fpeter%5Fa%5F200407%5Fphd.pdf.

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Thesis (M.S.)--School of Mechanical Engineering, Georgia Institute of Technology, 2005. Directed by David Trivett.<br>Trivett, David, Committee Chair ; Berthelot, Yves, Committee Member ; Rogers, Peter, Committee Member. Includes bibliographical references.
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MororÃ, Luiz AntÃnio Taumaturgo. "AnÃlise nÃo linear geomÃtrica de vigas laminadas de parede fina." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=14007.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>A utilizaÃÃo de vigas laminadas de parede fina nas Engenharias AeronÃutica, Civil, MecÃnica e Naval tem crescido bastante nos Ãltimos anos, devido a suas elevadas relaÃÃes rigidez/peso e resistÃncia/peso. Esses elementos estruturais normalmente apresentam paredes finas devido à alta resistÃncia dos materiais compÃsitos. Outra caracterÃstica importante à que, mesmo sem apresentar grandes deformaÃÃes e sem que o limite elÃstico do material seja ultrapassado, estas vigas apresentam comportamento nÃo linear geomÃtrico devido à sua el
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Hokeš, Filip. "Statická a dynamická analýza předpjaté mostní konstrukce." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226802.

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The main objective of the thesis is to perform static and dynamic analysis of prestressed concrete bridge structures in computational system ANSYS. For the analysis was chosen footbridge over the river Svratka in Brno. In relation to this topic are solved various types of modeling prestress at a finite element level. Before analyzing the footbridge is analyzed in detail the static system and the corresponding final geometry of the structure. Knowledge of the functioning of the static system is used to build the computational model of the structure, on which is subsequently performed static and
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Sommer, Andrew Patrick. "VIBRATION-BASED HEALTH MONITORING OF MULTIPLE-STAGE GEAR TRAIN AND DIFFERENTIAL PLANETARY TRANSMISSION INVOLVING TEETH DAMAGE AND BACKLASH NONLINEARITY." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/631.

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The objective of this thesis is to develop vibration-based fault detection strategies for on-line condition monitoring of gear transmission systems. The study divides the thesis into three sections. First of all, the local stresses created by a root fatigue crack on a pinion spur gear are analyzed using a quasi-static finite element model and non-linear contact mechanics simulation. Backlash between gear teeth which is essential to provide better lubrication on tooth surfaces and to eliminate interference is included as a defect and a necessary part of transmission design. The second section i
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Lorenz, Michael. "Berechnungsmodelle zur Beschreibung der Interaktion von bewegtem Sägedraht und Ingot." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2014. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-130678.

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Die vorliegende Arbeit widmet sich der Aufgabe makroskopische Berechnungsmodelle zur Beschreibung des Drahtsägens zu erarbeiten. Ziel ist es, die wesentlichen Effekte abzubilden und den Einfluss von Prozessparametern auf die Dynamik des Systems zu bestimmen. Ein zentraler Punkt ist die Modellierung des bewegten Sägedrahtes. Durch die dem Kontinuum an den Auflagern aufgeprägte Führungsbewegung sind einerseits die Randbedingungen und andererseits ortsfest auf den Draht wirkende Lasten nichtmateriell. Die korrekte kinematische Beschreibung dieses Sachverhaltes ist essentielle Grundlage für die sp
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Babadopulos, Lucas. "Phenomena occurring during cyclic loading and fatigue tests on bituminous materials : Identification and quantification." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSET006/document.

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La fatigue est un des principaux mécanismes de dégradation des chaussées. En laboratoire, la fatigue est simulée en utilisant des essais de chargement cyclique, généralement sans période de repos. L’évolution du module complexe (une propriété du matériau utilisée dans la caractérisation de la rigidité des matériaux viscoélastiques) est suivie de manière à caractériser l’endommagement. Son changement est généralement interprété comme étant dû au dommage, alors que d’autres phénomènes (se distinguant du dommage par leur réversibilité) apparaissent. Des effets transitoires, propres aux matériaux
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Almeida, Felipe Schaedler de. "Desenvolvimento de ferramentas computacionais para análise de interação fluido-estrutura incluindo não linearidade geométrica." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/76146.

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Esse trabalho trata da análise computacional de problemas aeroelásticos. Os casos de interesse envolvem escoamentos compressíveis em torno de estruturas de cascas de materiais compósitos laminados. A solução do problema de interação fluido- estrutura é conduzida por meio do esquema particionado denominado improved serial staggered procedure (ISS), o que permite a utilização de algoritmos independentes para a análise de cada componente do sistema. Um elemento triangular plano com três nós destinado à análise de cascas de materiais compósitos laminados é obtido com base na formulação de dois ele
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Crochepeyre, Stéphane. "Contribution à la modélisation numérique et théorique de la localisation et de la post-localisation dans les géomatériaux." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10023.

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Une etude numerique et theorique de la localisation de la deformation en bandes de cisaillement dans les geomateriaux est presentee. Cette etude comprend deux parties distinctes : ' la premiere partie de la detection du moment d'apparition de la localisation et plus generalement des phenomenes de bifurcation. L'etude est realisee dans le cadre des grandes transformations en utilisant le modele cloe. Dans ce but, un modele cloe von mises et un algorithme de detection de perte d'unicite globale, permettant la resolution d'un probleme aux limites formule en vitesses, ont ete developpes. L'influen
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Tiar, Mohamed Amine. "Éléments finis spéciaux pour l’analyse linéaire et non-linéaire géométrique des structures composites à renforts fibreux." Thesis, Compiègne, 2017. http://www.theses.fr/2017COMP2345/document.

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La modélisation numérique des structures composites à renfort fibreux de géométrie complexe constitue un axe de recherche majeur afin de prédire correctement leur comportement mécanique. Dans ce contexte, l’étude menée dans ce travail de thèse porte sur le développement de nouveaux éléments finis basés sur une approche numérique multi-échelle, appelée Approche de la Fibre Projetée (AFP). Cette approche a l’avantage de tenir compte de la présence des fibres au sein d’un espace matrice sans les discrétiser, ce qui limite considérablement la taille du système à résoudre. Pour analyser le comporte
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Neto, Apiano Ferreira de Morais. "Chaveamento de pulsos ultracurtos em grades de Bragg nÃo-lineares de fibras Ãpticas." Universidade Federal do CearÃ, 2006. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=173.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>Grades de Bragg nÃo-lineares tÃm sido consideradas desde o final do sÃculo passado para aplicaÃÃes em sistemas de comunicaÃÃes Ãpticas e sensoriamento. O estudo de pulsos ultra-curtos em grades de Bragg lineares, entretanto, sà tem sido considerado nos Ãltimos anos, devido ao desenvolvimento de tÃcnicas numÃricas especÃficas para se resolver o problema. Neste trabalho, foi realizado um estudo analÃtico-numÃrico das caracterÃsticas de transmissÃo e reflexÃo das grades de Bragg nÃo-lineares. Pela primeira vez, foram consideradas va
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Wu, Yu-Hsiu, and 吳毓修. "System Reliability-Based Optimal Design of Trusses with Material Nonlinearity." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/29884078001290593084.

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(10668816), Sunny Ambalal Sharma. "STOCHASTIC MODEL GENERATION AND SELECTION FOR DEVICE EMULATING STRUCTURAL MATERIAL NONLINEARITY." Thesis, 2021.

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<div><div><div><p>Structural identification is a useful tool for detecting damage and damage evolution in a structure. The initiation of damage in a structure and its subsequent growth are mainly associated with nonlinear behaviors. While linear dynamics of a structure are easy to simulate, nonlinear structural dynamics have more complex dynamics and amplitude dependence that do require more sophisticated simulation tools and identification methods compared to linear systems. Additionally, there are generally many more parameters in nonlinear models and the responses may not be sensitive to al
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Changizi, M. Amin. "Geometry and Material Nonlinearity Effects on Static and Dynamics Performance of MEMS." Thesis, 2011. http://spectrum.library.concordia.ca/36193/1/Changizi_PhD_S2012.pdf.

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Nonlinear behavior of micro-mechanical systems is an interesting and little explored area of research. Although, micro-system technologies is new and fast developing area, there is little work carried out on modeling and simulation of MEMS devices which concerns their non-linear behavior. Nonlinear modeling of MEMS devices is based on observations related to the micro-systems performance which is often far away from linearity in MEMS devices. There are two types of components that are extensively used in MEMS design: micro-beams (cantilever type) and micro-plates. Manufacturing as well as usa
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Chen, HungWei, and 陳宏威. "Seismic Nonlinear Analysis of Cable-Stayed bridge in Various Soil Condition － Considering Geometric and Material Nonlinearity." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/27157726102045277021.

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碩士<br>淡江大學<br>土木工程學系<br>90<br>To accomplish a sophisticated seismic analysis for Cable-Stayed bridges, it is essential to include not only the geometric nonlinearity resulting from the evident change in geometric appearance of structure bus also the material nonlinearity due to the significant deformation occurring in some regions of structural elements. Accordingly, in addition to taking the interaction of axial force and bending moment, in association with the geometric nonlinearity, into account, a degrading tri-linear model is chosen in this research to describe the relationship between mo
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He, Shuai. "Spectral finite element modelling and damage identification of beam-like structures using linear and nonlinear guided waves." Thesis, 2017. http://hdl.handle.net/2440/109804.

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This thesis contains a series of journal papers focused on the development of the model-based approach for damage identification using guided waves. The proposed approach requires no baseline data. It can identify multiple damages such as characterising the number, location and the size of cracks in isotropic beams and delaminations in composite beams efficiently and accurately with quantifying the associated uncertainties using linear guided waves. It also investigate the plausibility of using the nonlinear guided wave for damage identification. Based on the modelling ability, this approach i
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Kuzmanovic, Aleksandar. "Preliminary Design of Slender Reinforced Concrete Highway Bridge Pier Systems." Thesis, 2014. http://hdl.handle.net/1807/65569.

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Feasible span-to-depth ratios for many modern bridge systems have been identified and documented in literature. No such parameters have been adequately identified in terms of proportioning bridge piers. This thesis includes a study of 22 existing reinforced concrete highway bridges and their respective pier systems to determine the state-of-the-art in design. The effect of different geometric and material parameters such as concrete strength, reinforcement ratio and slenderness ratio on the structural behavior of individual piers and multiple pier systems was examined. Approximate methods, whi
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Yeung, Carman. "Investigation of Linear and Nonlinear Torsional Guided Waves in Hollow Circular Cylinders for Damage Detection." Thesis, 2021. http://hdl.handle.net/2440/130216.

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Non-destructive testing plays an important role in structural health monitoring. One of the promising options is the use of guided wave for damage detection in engineering applications, such as pipeline and truss system. Common types of damage in the structures include cracks and corrosion. Guided wave is sensitive to cracks up to micro scale. Long range inspection is the other benefit of using guided wave. The overall aim of this thesis is to present a systematic investigation of guided wave in pipe-like structures to gain physical insights into linear and nonlinear features associated with t
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Chandan, Swet. "Towards An Advanced 14-Node Brick Element For Sheet Metal Forming." Thesis, 2005. https://etd.iisc.ac.in/handle/2005/1069.

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Sheet metal forming is used in a wide range of industrial processes ranging from tube manufacturing to automobile and aviation industry. It includes processes like stamping, bending, stretching, drawing and wheeling. In the past few years materials for sheet metal forming and, technology have improved a lot. The improved materials have higher strength and more ductility than conventional sheet steel and therefore they have to be worked differently. For such steels conventional methods can not be applied totally. So there is a need for constant improvement in technology. Trial and error me
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