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Dissertations / Theses on the topic '3D beam element'

Author: Grafiati

Published: 11 March 2023

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1

Gao, Sasa. "Development of a new 3D beam finite element with deformable section." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI026/document.

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Le nouvel élément de poutre est une évolution d'un élément de Timoshenko poutre avec un nœud supplémentaire situé à mi-longueur. Ce nœud supplémentaire permet l'introduction de trois composantes supplémentaires de contrainte afin que la loi constitutionnelle 3D complète puisse être utilisée directement. L'élément proposé a été introduit dans un code d'éléments finis dans Matlab et une série d'exemples de linéaires/petites contraintes ont été réalisées et les résultats sont systématiquement comparés avec les valeurs correspondantes des simulations ABAQUS/Standard 3D. Ensuite, la deuxième étape

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2

Song, Huimin. "Rigorous joining of advanced reduced-dimensional beam models to 3D finite element models." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33901.

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This dissertation developed a method that can accurately and efficiently capture the response of a structure by rigorous combination of a reduced-dimensional beam finite element model with a model based on full two-dimensional (2D) or three-dimensional (3D) finite elements. As a proof of concept, a joint 2D-beam approach is studied for planar-inplane deformation of strip-beams. This approach is developed for obtaining understanding needed to do the joint 3D-beam model. A Matlab code is developed to solve achieve this 2D-beam approach. For joint 2D-beam approach, the static response of a basic

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3

De, Frias Lopez Ricardo. "A 3D finite beam element for the modelling of composite wind turbine wings." Thesis, KTH, Bro- och stålbyggnad, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-119079.

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The main purpose of this thesis is to develop a 3D beam element in order to model wind turbine wings made of composite materials. The proposed element is partly based on the formulation of the classical beam element of constant cross-section without shear deformation (Euler-Bernoulli) and including Saint-Venant torsional effects for isotropic materials, similarly to the one presented in Batoz & Dhatt (1990, pp.147-190). The main novelty consists in the addition of the coupling between axial and bending with torsional effects that may arise when using composite materials. PreComp, a free ac

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4

Lyu, Chunhao. "Progressive Collapse Resistance of Post-and-Beam Mass Timber Buildings: Experimental and Numerical Investigations on 2D and 3D Substructures." Thesis, Griffith University, 2021. http://hdl.handle.net/10072/406078.

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Mid-rise to tall timber buildings are internationally gaining popularity. Reaching heights greater than 5 to 6 storeys has been made possible by the availability of engineered wood products, such as Laminated Veneer Lumber (LVL), Glued laminated timber (Glulam) and Cross Laminated Timber (CLT). These buildings are referred to as “mass timber buildings”. As the height of timber buildings increases, so do their potential risks of progressive collapse. Progressive collapse is characterised by a local failure of a load-bearing structural element which may propagate through the whole building, and

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5

Possidente, Luca. "Development and application of corotational finite elements for the analysis of steel structures in fire." Doctoral thesis, Università degli studi di Trento, 2021. http://hdl.handle.net/11572/289943.

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Utbredningen av en brand inuti en byggnad kan leda till global eller lokal strukturell kollaps, särskilt i stålramkonstruktioner. Faktum är att stålkonstruktioner är särskilt utsatta för termiska angrepp på grund av ett högt värde av stålkonduktivitet och tvärsnitten med små tjockleken. Som en viktig aspekt av konstruktionen bör brandsäkerhetskrav uppnås antingen enligt föreskrivande regler eller enligt antagande av prestationsbaserad brandteknik. Trots möjligheten att använda enkla metoder som involverar membersanalys kombinerat med nominella brandkurvor, är en mer exakt analys av det termome

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6

Gunbring, Freddie. "Prediction and Modelling of Fastener Flexibility Using FE." Thesis, Linköping University, Department of Management and Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11428.

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<p>This report investigates the feasibility and accuracy of determining fastener flexibility with 3D FE and representing fasteners in FE load distribution models with simple elements such as springs or beams. A detailed study of 3D models compared to experimental data is followed by a parametric study of different shell modelling techniques. These are evaluated and compared with industry semi-empirical equations.</p><p>The evaluated 3D models were found to match the experimental values with good precision. Simulations based on these types of 3D models may replace experimental tests. Two differ

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7

Ferradi, Mohammed Khalil. "Nouveaux modèles d'éléments finis de poutres enrichies." Thesis, Paris Est, 2015. http://www.theses.fr/2015PESC1173/document.

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Les éléments de poutres classiques (Euler-Bernoulli, Timoshenko, Vlassov…), sont tous basés sur certaines hypothèses simplificatrices, qui ont pour conséquence de fixer la forme de la cinématique de l'élément. Ceci revient à réduire un modèle ayant par définition une infinité de d.d.l., à un modèle avec un nombre fini de d.d.l.. Quel que soit donc le chargement auquel sera soumise la poutre, elle se déformera toujours selon la cinématique adoptée au départ. L'objectif de cette thèse est de s'affranchir des hypothèses inhérentes aux modèles de poutres classiques, pour développer un nouveau modè

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8

Apedo, Komla Lolonyo. "Numerical modelling of inflatable structures made of orthotropic technical textiles : application to the frames of inflatable tents." Thesis, Lyon 1, 2010. http://www.theses.fr/2010LYO10145.

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L'objectif principal visé par cette thèse est de modéliser les poutres gonflables en textiles techniques orthotropes. Les approches statiques font l'objet de ce rapport. Avant d'aborder ce problème, nous avons été amenés à identifier tous les paramètres qui ont un effet direct sur les propriétés mécaniques effectives de ces composites. Ainsi, nous avons développé un modèle micro mécanique de prédiction de ces propriétés mécaniques. Le modèle proposé est basé sur l’analyse d'un volume élémentaire représentatif (VER) prenant en compte non seulement les propriétés mécaniques et la. fraction de vo

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9

Harbrecht, Helmut, and Reinhold Schneider. "Wavelet Galerkin Schemes for 3D-BEM." Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200600452.

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This paper is intended to present wavelet Galerkin schemes for the boundary element method. Wavelet Galerkin schemes employ appropriate wavelet bases for the discretization of boundary integral operators. This yields quasisparse system matrices which can be compressed to O(N_J) relevant matrix entries without compromising the accuracy of the underlying Galerkin scheme. Herein, O(N_J) denotes the number of unknowns. The assembly of the compressed system matrix can be performed in O(N_J) operations. Therefore, we arrive at an algorithm which solves boundary integral equations within o

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10

Melandri, Giovanni. "Study of a novel solution to obtain controllable stiffness for beam-like elements." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20196/.

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La presente tesi tratta dello studio di concetti volti all'ottenimento di strutture meccaniche a rigidezza variabile per applicazioni in ambito di ricerca scientifica, in particolare per una futura applicazione in un robot aereo ad ala battente, al fine di studiare l'interazione tra ala elastica ed aria. Vengono riassunti i metodi per ottenere rigidezza variabile ed, in seguito ad una fase di confronto basato su requisiti ed obiettivi di progetto, vengono scelte due soluzioni. Il lavoro mostra che il concetto "sliding segments" funziona bene per una trave composta da un'asta interna ed un tu

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11

Jrad, Wassim. "Dynamic behavior of thin-walled beams : Analytical, numerical and experimental approaches." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0271.

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Les poutres à parois minces à sections ouvertes sont des éléments de base des ouvrages courants en génie civil, de l'automobile et de l'aéronautique. En raison de leur élancement et la forme des sections, elles sont très sensibles à la torsion et aux instabilités aussi bien en statique qu’en dynamique. En dynamique, les modes de vibration en torsion sont plus dominants par rapport au modes de flexion classiques. Pour ces raisons, les défaillances planaires de telles structures sont connues pour être une exception plutôt qu'une règle. Dans ce travail de thèse, on s’intéresse au comportement dyn

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12

Hou, Shuai. "Laser additive manufacturing of embedded 3D circuit system and microstructure manipulation using Gaussian and holographic optical elements reconstructed beams." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/17230.

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In Printed Circuit Board (PCB) manufacturing. making the conductive tracks 3D and embedding the electronic components in substrate can effectively reduce the circuit board volume, and improve the power delivery performance. Laser based additive manufacturing has been developed for many years but currently it is still used to create non-functional product. This PhD work will combine the two technologies together to generate a complete 3D embedded circuit system. hi addition. the laser beam will be reconstructed using Holographic Optical Elements (HOE) to control the microstructure of the produc

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13

Catelli, Ricardo Tardelli. "Desenvolvimento de processo litográfico tri-dimensional para aplicação em microóptica integrada." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-21102010-112508/.

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O presente trabalho tem como objetivo desenvolver um processo de fabricação de elementos micro-ópticos utilizando-se litografia por feixe de elétrons, empregando o resiste SU-8, negativo e amplificado quimicamente, sobre substrato de Si. Para tanto, é realizado o estudo dos parâmetros do efeito de proximidade a, b e h para se modelar e controlar os efeitos do espalhamento dos elétrons no resiste e no substrato, e se altera o processamento convencional do SU-8 para se obter um processo com baixo contraste. A determinação dos parâmetros do efeito de proximidade para o sistema de escrita direta e

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14

Watson, Francis Maurice. "Better imaging for landmine detection : an exploration of 3D full-wave inversion for ground-penetrating radar." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/better-imaging-for-landmine-detection-an-exploration-of-3d-fullwave-inversion-for-groundpenetrating-radar(720bab5f-03a7-4531-9a56-7121609b3ef0).html.

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Humanitarian clearance of minefields is most often carried out by hand, conventionally using a a metal detector and a probe. Detection is a very slow process, as every piece of detected metal must treated as if it were a landmine and carefully probed and excavated, while many of them are not. The process can be safely sped up by use of Ground-Penetrating Radar (GPR) to image the subsurface, to verify metal detection results and safely ignore any objects which could not possibly be a landmine. In this thesis, we explore the possibility of using Full Wave Inversion (FWI) to improve GPR imaging f

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15

Guo, Rong-Jer, and 郭榮哲. "Architecture of 3D Beam Element in Nonlinear Finite Element Analysis." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/02849037373320784454.

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碩士<br>國立成功大學<br>土木工程學系<br>89<br>The main purpose of this study is to develop a three-dimensional nonlinear beam element for the NSP program. The NSP program is a general purpose nonlinear finite element software for static and dynamic analyses of structures. The concept behind the program has been developed at the National Cheng-Kung University for a project from the National Science Council. In this report, extensions made to the NSP are described. And all the extensions are included in a subroutine, vbeam.for, of the NSP program. This subroutine mainly deals with the biaxial momen

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16

Chi, Tzu-Hao, and 紀祖豪. "A Study of 3D Nonlinear Beam Element in Structural Analysis." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/yyjve4.

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碩士<br>國立成功大學<br>土木工程學系碩博士班<br>90<br>The main purpose of this study is to improve the 3D beam element formulations for the NSP program and design the membrane element to simulate shear walls and floor slabs for modeling the inelastic behavior of reinforced concrete (RC) structures. The NSP program is a general purpose nonlinear finite element software for static and dynamic analyses of structures. In this report, all improvements were included in a subroutine, nbeam.for. It simplifies the input data of the 3D beam and adds the shear force yielding surface and elastic loading-unloading behavior.

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17

Huang, Wen-Zheng, and 黃文政. "Finite Element Analysis on 3D Nonlinear RC Beam Strengthened by External Steel Plates." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/77907132325000220314.

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碩士<br>國立臺北科技大學<br>土木與防災技術研究所<br>92<br>Now, the key point of the civil engineering is the strengthening of reinforced concrete structures. In the developed countries, every kind of materials is used in the strengthening of reinforced concrete structures, actively. The strengthening of external steel plates is the most common way. The bond of interface between the reinforced concrete structures and external steel plates is three-dimension of the thin elements, and there is not the analytic solution of three-dimension stresses after strengthening now. Therefore, the key point of this study is the

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18

Lin, Shih Chieh, and 林士傑. "Analysis of I-Beam with Non-uniform Depth Using 3D Finite Element Method." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/63814291588600488158.

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19

Jiang, Wen-Jie, and 江文傑. "Finite Element Analysis on 3D Nonlinear RC Beam Strengthened Glass Fiber Reinforcement Plastics." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/nkej5x.

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碩士<br>國立臺北科技大學<br>土木與防災研究所<br>94<br>Now, the key point of the civil engineering is the strengthening of reinforced concrete structures. In the developed countries, every kind of materials is used in the strengthening of reinforced concrete structures, actively. The strengthening of Glass Fiber Reinforcement Plastics is the most common way. The key point of this study is the finite element analysis of three-dimension stress of the bond. The goal of the present research is to analyze and predict the behavior and failure mechanism of reinforced concrete beams and use the nonlinear finite element

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20

DI, RE PAOLO. "3D beam-column finite elements under tri-axial stess-strain states: non-uniform shear stress distribution and warping." Doctoral thesis, 2017. http://hdl.handle.net/11573/937922.

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In many engineering structures, the effects of shear and torsional loads are an important aspect of both the analysis and the design process. These effects are usually neglected in typical framed structures. However, in some relevant cases, such as bridges, shear walls or thin-walled frames, it is essential to account for the shear and torsional loads and their interaction with the other loading conditions to correctly reproduce the structural response. In this framework, the main task is to accurately describe the nonlinear structural response in terms of global behavior and local stress-str

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21

Hoque, Mohammad M. "3D nonlinear mixed finite-element analysis of RC beams and plates with and without FRP reinforcement." Thesis, 2006. http://hdl.handle.net/1993/236.

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Three 3D nonlinear finite-element (FE) models are developed to study the behavior of concrete beams and plates with and without externally reinforcement of fibre reinforced polymer (FRP). Ramtekkar’s mixed layer-wise 3 dimensional (3D) 18-node FE model (108 degrees-of-freedom, DOFs) is modified to accommodate the nonlinear concrete and elasto-plastic steel behaviour. Saenz’s stress-strain equation is used for material nonlinearity of concrete. As in any 3D mixed FE analysis, the run time using the model can be computationally expensive. Two additional layer-wise 18-node FE models: Displacement

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22

Stoykov, Stanislav Dimitrov. "Nonlinear vibrations of 3D beams." Doctoral thesis, 2012. http://hdl.handle.net/10216/68242.

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This work was supported by Fundação para a Ciência e a Tecnologia, through the scholarship SFRH/BD/35821/2007<br>Tese de doutoramento. Engenharia Mecânica. Faculdade de Engenharia. Universidade do Porto. 2012

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23

Stoykov, Stanislav Dimitrov. "Nonlinear vibrations of 3D beams." Tese, 2012. http://hdl.handle.net/10216/68242.

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This work was supported by Fundação para a Ciência e a Tecnologia, through the scholarship SFRH/BD/35821/2007<br>Tese de doutoramento. Engenharia Mecânica. Faculdade de Engenharia. Universidade do Porto. 2012

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24

Parreira, Ricardo Jorge Patraquim Godinho. "Difusores acústicos 3D com forma orgânica: estudo numérico e optimização." Doctoral thesis, 2019. http://hdl.handle.net/10316/87633.

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Tese de Doutoramento em Engenharia Civil, no ramo de Construções, apresentada ao Departamento de Engenharia Civil da Faculdade de Ciências e Tecnologia da Universidade de Coimbra<br>Os difusores acústicos são correntemente utilizados no condicionamento acústico de espaços com maiores exigências acústicas (estúdios, salas de espectáculos, etc.), servindo, sobretudo, para garantir uma acústica adequada, sem absorções excessivas e espalhando o som mais uniformemente pela sala, eliminando ao mesmo tempo defeitos acústicos como ecos ou zonas sombra. Apesar da optimização de difusores ser um tema d

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25

Kirana, Kumara P. "Studies On The Viability Of The Boundary Element Method For The Real-Time Simulation Of Biological Organs." Thesis, 2016. http://etd.iisc.ernet.in/handle/2005/2553.

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Realistic and real-time computational simulation of biological organs (e.g., human kidneys, human liver) is a necessity when one tries to build a quality surgical simulator that can simulate surgical procedures involving these organs. Currently deformable models, spring-mass models, or finite element models are widely used to achieve the realistic simulations and/or the real-time performance. It is widely agreed that continuum mechanics based numerical techniques are preferred over deformable models or spring-mass models, but those techniques are computationally expensive and hence the higher

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