Log in

Relevant bibliographies by topics / Elastic analysis / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Elastic analysis.

Dissertations / Theses on the topic 'Elastic analysis'

Author: Grafiati

Published: 4 June 2021

Last updated: 20 February 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Elastic analysis.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Ghasemi, Ghamsari Amir H. "Analysis of elastic and elasto-plastic behaviour of spatial structures." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0010/NQ34769.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Makulsawatudom, Prasit. "Elastic and elastic-plastic analysis of thick cylindrical vessels with crossholes." Thesis, University of Strathclyde, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401319.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

鄺君尚 and Jun-shang Kuang. "Elastic and elasto-plastic analysis of shear wall and core wall structures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B3123155X.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Kuang, Jun-shang. "Elastic and elasto-plastic analysis of shear wall and core wall structures /." [Hong Kong] : University of Hong Kong, 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12428565.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

王元漢 and Yuanhan Wang. "The elastic and elasto-plastic fracture analysis by method of weightedresiduals and elasto-viscoplasticity." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B3123172X.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Wang, Yuanhan. "The elastic and elasto-plastic fracture analysis by method of weighted residuals and elasto-viscoplasticity /." [Hong Kong] : University of Hong Kong, 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12384033.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Janzen, Walter F. "Cable stayed bridges : nonlinear elastic dimensional analysis." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28388.

Full text

Abstract:

Cable stayed bridges are the state of the art in long span bridges. Developments in cable response analysis and computer hardware and software have allowed engineers to design and build many cable stayed bridges. Bridges of many different configurations with longer and longer spans are being built. With the long spans and high axial loads in the deck, the stability of cable stayed bridges becomes a growing concern. Current analysis procedures use a parabolic approximation to the true catenary response of cables, which is quite accurate for tight cables; however, for near instability conditions with the accompanying large deflections and consequently loose cables, a catenary model is called for. Herein, a study is conducted on the elastic stability of cable stayed bridges utilizing a true catenary model of cable response. A dimensional analysis of cable stayed bridge stability is undertaken as well as deck maximum deflection and moment under service load conditions. A computer program written by this author is the analysis tool used in this work. The program is given the acronym ULA which stands for Ultimate Load Analysis. ULA is a nonlinear plane frame program with catenary cable elements and an interactive graphics interface. The dimensional analysis is carried out by comparing the computer model of a cable stayed bridge to the theoretical model of a beam on an elastic foundation. Two preliminary simplified cable stayed bridge backspan models are studied first in order to develop the dimensionless ratios that are applicable to the bridge response and to gain an insight into the cable stayed bridge behaviour. The final model is that of an entire cable stayed bridge. Because of the multitude of parameters governing cable stayed bridge behaviour it is not possible to describe all cable stayed bridges. Instead, the dimensionless behaviour of a standard model is examined and the sensitivity of this standard to various parameter variations is given in the form of dimensionless charts. Finally, a preliminary design and analysis aid is developed from the dimensionless charts and is then applied to two existing bridge designs.
Applied Science, Faculty of
Civil Engineering, Department of
Graduate

APA, Harvard, Vancouver, ISO, and other styles

8

Dwyer, V. M. "Elastic scattering in quantitative Auger/XPS analysis." Thesis, University of York, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374164.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Strait, Justin. "Elastic Statistical Shape Analysis with Landmark Constraints." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1530966023478484.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Ali, Mohammed Ali Nasser. "Thermo-elastic-plastic analysis for elastic component under high temperature fatigue crack growth rate." Thesis, Sheffield Hallam University, 2013. http://shura.shu.ac.uk/19243/.

Full text

Abstract:

The research project presents a fundamental understanding of the fatigue crack growth mechanisms of AISI 420 martensitic stainless steel, based on the comparison analysis between the theoretical and numerical modelling, incorporating research findings under isothermal fatigue loading for solid cylindrical specimen and the theoretical modelling with the numerical simulation for tubular specimen when subjected to cyclic mechanical loading superimposed by cyclic thermal shock. The experimental part of this research programme studied the fatigue stress-life data for three types of surface conditions specimen and the isothermal stress-controlled fatigue testing at 300 °C - 600 °C temperature range. It is observed that the highest strength is obtained for the polished specimen, while the machined specimen shows lower strength, and the lowest strength is the notched specimen due to the high effect of the stress concentration. The material behaviour at room and high temperatures shows an initial hardening, followed by slow extension until fully plastic saturation then followed by crack initiation and growth eventually reaching the failure of the specimen, resulting from the dynamic strain ageing occurred from the transformation of austenitic microstructure to martensite and also, the nucleation of precipitation at grain boundaries and the incremental temperature increase the fatigue crack growth rate with stress intensity factor however, the crack growth rate at 600 °C test temperature is less than 500 °C because of the creep-fatigue taking place. The theoretical modelling presents the crack growth analysis and stress and strain intensity factor approaches analysed in two case studies based on the addition of thermo-elastic-plastic stresses to the experimental fatigue applied loading. Case study one estimates the thermal stresses superimposed sinusoidal cyclic mechanical stress results in solid cylinder under isothermal fatigue simulation. Case study two estimates the transient thermal stresses superimposed on cyclic mechanical loading results in hollow cylinder under thermal shock in heating case and down shock cooling case. The combination of stress and strain intensity factor theoretical calculations with the experimental output recorded data shows a similar behaviour with increasing temperature, and there is a fair correlation between the profiles at the beginning and then divergence with increasing the crack length. The transient influence of high temperature in case two, giving a very high thermal shock stress as a heating or cooling effects, shifting up the combined stress, when applied a cyclic mechanical load in fraction of seconds, and the reputations of these shocks, causing a fast failure under high thermal shock stress superimposed with mechanical loading. Finally, the numerical modelling analyses three cases studied were solved due to the types of loading and types of specimen geometry by using finite element models constructed through the ANSYS Workbench version 13.0. The first case is a low cyclic fatigue case for a solid cylinder specimen simulated by applying a cyclic mechanical loading. The second is an isothermal fatigue case for solid cylinder specimen simulated by supplying different constant temperatures on the outer surface with cyclic mechanical loading, where the two cases are similar to the experimental tests and the third case, is a thermo-mechanical fatigue for a hollow cylinder model by simulating a thermal up-shock generated due to transient heating on the outer surface of the model or down shock cooling on the inner surface with the cyclic mechanical loading. The results show a good agreement with the experimental data in terms of alternative stress and life in the first case. In case two results show the strain intensity factor is increases with increasing temperature similar to the theoretical solution due to the influence of the modulus of elasticity and the difference in life estimation with the experimental output record is related to the input data made of theoretical physical properties and the experimental stress-life data.

APA, Harvard, Vancouver, ISO, and other styles

11

Punjani, Minaz. "Crack characterisation using ultrasonic elastic waves." Thesis, University College London (University of London), 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267567.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Mohamed, Salah-Eldin A. "Elastic-plastic instability of plane frames." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/12092.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Zheng, Yuquan. "Stochastic finite element analysis of continuous elastic systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0002/MQ42231.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Mitric, Ilie Radu. "Analysis of a refined model for elastic plates." Thesis, Durham University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269884.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

HECKE, MILDRED BALLIN. "POTENTIAL WIDESPREAD AND OPTIMIZATION IN ELASTIC-PLASTIC ANALYSIS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1991. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33252@1.

Full text

Abstract:

COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
Este trabalho focaliza a análise elasto-plástica de componentes mecânicos e estruturais. Especial atenção é dada a formulação da equação constitutiva. A relação constitutiva em taxas é equacionada na forma de potenciais generalizados onde utiliza-se o conceito de subgradientes. Para tal, são introduzidos conceitos básicos da termodinâmica sendo usadas variáveis internas para descrever os mecanismos dissipativos. São apresentados pseudo-potenciais em incrementos finitos de tensões e deformações que incorporam a admissibilidade plástica e são capazes de descrever o descarregamento elástico local desde que não haja plastificação seguida de descarregamento no passo. Esta forma é utilizada na obtenção-de Princípios de Mínimo para a análise elasto-plástica. A discretização espacial é feita utilizando o Método dos Elementos Finitos. São considerados algoritmos para a solução de tal problema. São incluídas aplicações numéricas a problemas planos e a flexão de placas.
The elastic-plastic analysis of structural components is considered. The formulation of the constitutive equations is specially focused. The constitutive relation for rates is derived from pseudo-potentials by using the sub-gradient concept. Internal variables are introduced to describe dissipation mechanisms and thermodynamical concepts are used in order, to obtain the corresponding potential relationships. Generalized potentials are also presented for the approximate constitutive relation in terms of finite increments of strain and stress. This formulation incorporate plastic admissibility constraínts and it is also able to describe local elastic unloading except the case when it follows plastic yielding in the true incremental process. This form of the constitutive equation is used next to obtain minimum principles for the elastic-plastic analysis. Spatial discretization is performed by means of the Finíte Element Method. Some algorithms are discussed for the solution of the variational formulations considered. Numerical applications are presented for plane problems and plate bending.

APA, Harvard, Vancouver, ISO, and other styles

16

Olars, Sebastian. "Analysis of Diameter Log Files with Elastic Stack." Thesis, Karlstads universitet, Institutionen för matematik och datavetenskap (from 2013), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-80770.

Full text

Abstract:

There is a growing need for more efficient tools and services for log analysis. A need that comes from the ever-growing use of digital services and applications, each one generating thousands of lines of log event message for the sake of auditing and troubleshooting. This thesis was initiated on behalf of one of the departments of the IT consulting company TietoEvry in Karlstad. The purpose of this thesis project was to investigate whether the log analysis service Elastic Stack would be a suitable solution for TietoEvry’s need for a more efficient method of log event analysis. As part of this investigation, a small-scale deployment of Elastic Stack was created, used as proof of concept. The investigation showed that Elastic Stack would be a suitable tool for the monitoring and analysis needs of TietoEvry. The final version of deployment was, however, not able to fulfill all of the requirements that were initially set out by TietoEvry, however, this was mainly due to a lack of time and rather than limitations of Elastic Stack.

APA, Harvard, Vancouver, ISO, and other styles

17

Connolly, Joseph. "Aero-Propulso-Elastic Analysis of a Supersonic Transport." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543337967878799.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Nanda, Atul. "Finite element analysis of elastic-plastic anisotropic soils." Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/53650.

Full text

Abstract:

Elastic-plastic stress·strain models are developed for initially anisotropic soils. The models are developed for both total stress (undrained) analyses and for effective stress (drained) analyses. For anlsotroplc undralned coheslve soils under monotonic loading an elastic-plastic isotropic-hardening model is developed. For complex loading conditions the model is extended using multisurface plasticity. For effective stress analyses of soils, the Cam-Clay model concepts are generalized for initially anisotropic soils. Both isotropic and anisotropic hardening are used in the model. The behavior of the models is investigated under several loading conditions and some comparisons are made with experimental triaxial data. A nonlinear three-dimensional finite element program is developed in which the models are implemented. An updated Lagrangian large displacement analysis is also included. The constitutive models developed are used to investigate the influence of initial anisotropy on the bearing capacity, deformation and pore pressure development under footings in both plane-strain and three dimensional conditions. It is found that for the range of anisotropy encountered in the field, the deformation and bearing capacity are significantly different.
Ph. D.

APA, Harvard, Vancouver, ISO, and other styles

19

Wan, Deborah Jo-May 1974. "On elastic-plastic large deformation analysis of beams." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/10076.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Davis, Roosevelt. "A PREDICTION OF ELASTIC PROPERTIES OF AN ELASTIC COUPLING USING EXPERIMENTAL DATA AND FINITE ELEMENT ANALYSIS." MSSTATE, 2003. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07242003-163336/.

Full text

Abstract:

The dynamic properties of the elastic coupling are not readily known; therefore testing has to be performed in order to determine these properties. This is the primary objective for this thesis. The dynamic properties in question are the stiffness and damping. An attempt to determine the dynamic properties was also be carried out through the use of finite element analysis. There are two different configurations of couplings. One configuration forms the coupling from several elastic elements, referred to as HRC elements, which are manufactured in three sizes: A, B, and C. The second configuration, referred to as the HEMD coupling, has a single elastic member in the form of a hollow rubber/fabric ring connecting the input to the output. The couplings have cords made of either polyester or nylon. These cords will affect the dynamic properties of the coupling.

APA, Harvard, Vancouver, ISO, and other styles

21

Moody, John Joel. "A finite element analysis of elastic-plastic sliding of hemispherical contacts." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/31992.

Full text

Abstract:

Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2007.
Committee Chair: Itzhak Green; Committee Member; Jeffrey Streator; Committee Member: Richard Neu. Part of the SMARTech Electronic Thesis and Dissertation Collection.

APA, Harvard, Vancouver, ISO, and other styles

22

Beckham, Jon Regan. "Analysis of mathematical models of electrostatically deformed elastic bodies." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 169 p, 2008. http://proquest.umi.com/pqdweb?did=1475178561&sid=27&Fmt=2&clientId=8331&RQT=309&VName=PQD.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Hocknell, Alan. "Computational and experimental analysis of elastic deformation in impact." Thesis, Loughborough University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263673.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Djabella, Hocine. "Finite element analysis of elastic stresses in coated surfaces." Thesis, University of Salford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334019.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

PACHECO, PEDRO MANUEL CALAS LOPES. "ANALYSIS OF THE THERMOMECHANICAL COUPLING IN ELASTIC-VISCOPLASTIC MATERIALS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1994. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33223@1.

Full text

Abstract:

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
A modelagem do acoplamento entre os fenômenos mecânicos e térmicos em sólidos inelásticos é considerada neste trabalho. O acoplamento termomecânico é importante em determinadas situações, como por exemplo, no estudo de problemas envolvendo deformações inelásticas cíclicas em estruturas metálicas. Um procedimento sistemático para obtenção de equações constitutivas termodinamicamente admissíveis é apresentado. Através deste procedimento, baseado na Termodinâmica dos Processos Irreversíveis, foi possível obter uma teoria constitutiva para modelar o comportamento anisotérmico de metais e ligas metálicas. Dois tipos de acoplamentos termomecânicos foram identificados: o acoplamento interno, associado à dissipação interna do processo mecânico, e o térmico, associado à dependência dos parâmetros das equações constitutivas com a temperatura. A teoria foi particularizada para materiais elasto-viscoplásticos. Simulações com barras foram realizadas para estudar fenômenos como o aquecimento de metais provocado por solicitações mecânicas complexas e o comportamento de metais submetidos a grandes gradientes de temperatura. Uma variável de dano foi incorporada ao modelo, permitindo estudar a influência do acoplamento termodinâmico em processos de degradação do material como fadiga de baixo ciclo.
The present work is concerned with the modeling of the coupling between mechanical and termal phenomena. The thermomechanical coupling is important in some problems like those involving inelastic cyclic deformation in metallic structures. A systematic procedure to obtain thermodynamically admissible constitutive equations is presented. Such procedure has a strong thermodynamic basis and is used to obtain a constant theory to model the anisothermal behavior of metals and alloys. Two kinds of thermomechanical couplings can be identified: the internal coupling, related with the internal dissipation in the mechanical process and the thermal coupling, related with the dependence of the material parameters in the constitutive equations on temperature. The theory is particularized to elasto-viscoplastic materials. Uniaxial simulations were performed to study the heating of metals due to complex mechanical loadings and the behavior of metals subjected to high temperature gradients. A damage variable is introduced in the model to study the influence of the thermomechanical coupling in processes involving the degradation of the material like in low-cycle fatigue.

APA, Harvard, Vancouver, ISO, and other styles

26

Sandin, Joakim. "Analysis Methods for Structures with Visco-Elastic Damping Treatment." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13250.

Full text

Abstract:

During aircraft development, the impact of vibrations is examined and how this affects the aircraft structure under different conditions. Those vibrations can damage electronic equipment that are installed within the fuselage and can even lead to material fatigue within the structure. To reduce vibrations there are two approaches that are preferred to use, installing vibration insulators attached between the structure and the electrical component or change the design of the structure to a stiffer one. Those methods are easiest to implement in an early stage of the development but in later stages, when vibration problems usually are detected, it is too difficult and expensive to do major changes of the structure and there is lack of space to implement vibration insulators. A third method is then to apply passive damping in form of damper mats to surfaces on structures where critical vibrations occurs. The effects on the structural behavior when damper mats are applied to a certain structure are studied in this thesis work. The purpose is to get deeper knowledge about how damper mats can be used to reduce vibrations in aircraft structures. The type of damper mat that is studied is known as Constrained Layer Damping, CLD, which is a sandwich of a visco-elastic material layer and a stiffer constraining material layer. Modelling and simulation methods that are based on commercial FE-software have been developed. The analysis method is based on doing a modal analysis with structural damping taken into account. This makes it possible to predict the overall global damping at each structural mode. The models for damper mats have in this project been verified with experimental testing using typical damper mats. The methodology can be used to predict the behavior of damped structures in order to obtain an effective and lightweight passive damping solution.
Under utvecklingen av flygplan undersöks hur vibrationer påverkar flygplansstrukturen under olika förutsättningar. Dessa vibrationer kan skada elektronisk utrustning som är monterad i flygplanskroppen och kan även göra så att materialutmattning uppstår i flygplansstrukturen. För att motverka vibrationer finns det två metoder som är att föredra, antingen att montera vibrationsisolatorer mellan de elektroniska utrustningarna och strukturen eller att ändra designen på strukturer till en styvare. Dessa metoder är enkla att implementera i ett tidigt steg i utvecklingsprocessen men i senare steg, då vibrationsproblem ofta upptäcks, så är det för komplicerat och för dyrt att göra större ändringar på strukturen och så är det ont om plats för att kunna installera vibrations isolatorer. En tredje metod är istället att implementera passiv dämpning i form av dämpningsmattor på ytor av strukturen där kritiska vibrationer uppstår. Effekterna av det strukturella uppförandet när dämpningsmattor är applicerade på en viss struktur har studerats i det här examensarbetet. Syftet är att få en fördjupad kunskap om hur dämpningsmattor kan användas för att reducera vibrationer i flygplan strukturer. Den typ av dämpningsmatta som har studerats är känd som Constrained Layer Damping, CLD, vilken är en sandwich av ett visko-elastiskt lager samt ett styvare lager. Modellerings och simuleringsmetoder som är baserade på kommersiella FE-mjukvaror har utvecklats. Analysmetoderna är baserade på att utföra modalanalys tillsammans med strukturell dämpning. Detta möjliggör att förutse den övergripande dämpningen vid varje strukturell mod. Modellerna för dämpningsmattorna har i det här projektet verifierats med experimental testning av typiska dämpningsmattor. Metodiken kan användas till att prediktera beteendet av dämpade strukturer för att uppnå en effektiv och lättviktig passiv dämpningslösning.

APA, Harvard, Vancouver, ISO, and other styles

27

Jinn, Jong-Tae. "Finite element analysis of elastic contact problems with friction /." The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487668215807717.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

So, Jinyoung. "Three-dimensional vibration analysis of elastic bodies of revolution /." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487842372894422.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Zheng, Xian-Jun Carleton University Dissertation Engineering Mechanical. "Boundary element fracture mechanics analysis of elastic inclusion problems." Ottawa, 1991.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

30

Welzel, Udo Siegfried. "Diffraction analysis of residual stress modelling elastic grain interaction /." Stuttgart : Univ, 2002. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10221702.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Nurmela, Arto. "Non-Rutherford elastic scattering cross sections for materials analysis." Helsinki : University of Helsinki, 2001. http://ethesis.helsinki.fi/julkaisut/mat/fysii/vk/nurmela/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Serkov, S. K. "Asymptotic analysis of mathematical models for elastic composite media." Thesis, University of Bath, 1998. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390311.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Morgan, Andrew Scott. "Seismic Response of Stiffening Elastic Systems." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3491.

Full text

Abstract:

Traditional seismic load resisting systems in buildings are designed to undergo inelastic deformations in order to dissipate energy, resulting in residual displacements. This work explores an approach to eliminate these residual displacements. The systems investigated have low initial stiffness which increases at a predefined displacement, and are therefore called stiffening elastic systems. This thesis begins with an examination of single-degree-of-freedom stiffening elastic systems. A case study is presented which suggests that the benefits from stiffening elastic behavior may be limited to systems which would have long periods if designed traditionally. A thorough parameter study is also presented which indicates the benefit of stiffening elastic behavior for SDOF systems with periods greater than four seconds. A final case study is presented that compares the response of a twelve-story stiffening elastic system to a ductile system and an elastic system. The stiffening elastic system was able to eliminate the residual displacements inherent in a ductile system while lowering the base shear experienced by the elastic system, but is not clearly better than the ductile system because the base shear force was much higher.

APA, Harvard, Vancouver, ISO, and other styles

34

Fricke, J. Robert. "Acoustic scattering from elastic ice a finite difference solution /." Woods Hole, Mass. : Woods Hole Oceanographic Institution, 1991. http://catalog.hathitrust.org/api/volumes/oclc/24347157.html.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Chang, YoÌ†ng-sik. "Fluid loading and hydro-elastic response of towed pipelines." Thesis, University College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243278.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Akarapu, Sreekanth. "Numerical analysis of plane cracks in strain-gradient elastic materials." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Thesis/Fall2005/S%5FAkarapu%5F082205.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Leinster, James Carson. "The design of steel frames using plastic theory." Thesis, Queen's University Belfast, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277487.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Pinarbasi, Seval. "A New Formulation For The Analysis Of Bonded Elastic Layers." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608310/index.pdf.

Full text

Abstract:

Elastic layers bonded to reinforcing sheets are widely used in many engineering applications, e.g., as elastic foundations to machinery, as seismic isolators to structures, etc. Because of its practical importance, the behavior of bonded elastic layers under some basic deformation modes (e.g., compression, bending and shear modes) has attracted the attention of many researchers. However, the analytical works available in literature involve, with the object of obtaining design formulas, many simplifying assumptions. In this dissertation, a new formulation is developed for the analysis of bonded elastic layers, which removes most of the assumptions used in the earlier formulations. Since the displacement boundary conditions are included in the formulation itself, there is no need to start the formulation with some assumptions on stress and/or displacement distributions or with some limitations on geometrical and/or material properties. For this reason, the solutions derived from this formulation are valid not only for &ldquo
thin&rdquo
layers of strictly/nearly incompressible materials but also for &ldquo
thick&rdquo
layers and/or compressible materials. The advanced solutions obtained within the framework of the new formulation are used to study the behavior of bonded elastic layers under basic deformation modes. The effects of three key parameters, shape factor, Poisson&rsquo
s ratio and reinforcement flexibility, on effective layer moduli, displacement/stress distributions, and location/magnitude of maximum stresses are investigated. It is shown that the stress assumptions of the &ldquo
pressure&rdquo
method are inconsistent with the results obtained for thick layers and/or compressible materials and/or flexible reinforcements, and that the assumption &ldquo
plane sections remain plane&rdquo
is not valid, in general.

APA, Harvard, Vancouver, ISO, and other styles

39

Haliscelik, Murat. "Elastic-plastic Finite Element Analysis Of Semi-hot Forging Dies." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610542/index.pdf.

Full text

Abstract:

Semi-hot or warm forging is an economical alternative to the conventional forging processes by combining advantages of hot and cold forging processes. In this study, a new forging process sequence and design of the preform die for a part which has been produced by hot forging are proposed to be produced by semi-hot forging. Thermo-mechanical finite element analyses are performed over the stages of forging process. The billet and the dies are modeled as elastic-plastic bodies. Effects of preform die geometry on the die stresses and the forging load are investigated using finite element method. Comparison of the results obtained by using two different commercial finite element analysis programs is done for semi-hot and hot forging temperature ranges. The forging temperatures are determined for the particular part and the experiments are conducted by using the 1000 ton forging press. The parts are produced without any defects and material wastage in the form of flash is reduced. The numerical results are also compared with the experimental results and a good agreement is achieved.

APA, Harvard, Vancouver, ISO, and other styles

40

Thrower, Edward Neal. "Permanent deformation of flexible road pavements by visco-elastic analysis." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37877.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Cottle, Paul Wesley. "Aerosol type analysis with single wavelength, dual polarization elastic LIDAR." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/57069.

Full text

Abstract:

Aerosols play an important role in many atmospheric processes but their highly heterogeneous nature makes them difficult to study. Thus, new advancements in the field frequently focus on finding ways to more accurately determine more information about aerosols as they occur. LIght Detection And Ranging (LIDAR) systems have become an important tool in the study of aerosols because they can provide high resolution vertical profiles of quantities of interest (including aerosol concentrations, temperature, and wind speed, among others) over several kilometres of altitude. But on the other hand, the data can be ambiguous or difficult to correctly interpret and LIDAR systems can be costly and usually require a great deal of technical expertise to maintain and operate. In recent years, technological developments in lasers and detectors have led to the development of relatively inexpensive LIDAR systems that are robust and simple to operate, but to date these single-wavelength elastic LIDARs have provided only basic analysis products, such as determining the heights of clouds or qualitative monitoring of aerosol layers. There is a need for more extensive analyses using these simpler LIDARs. To this end, an algorithm has been developed that employs ground-based, single-wavelength elastic LIDAR to create high resolution maps of aerosol and cloud types as well as backscatter and extinction coefficients. Applications for maps such as these include studies of long-range transport of aerosols, air quality within the planetary boundary layer, cloud-aerosol interactions, and visibility. Algorithms similar to this have been developed in the past, but they have required either multi-wavelength LIDAR systems or have stopped short of differentiating between aerosol and cloud types. This algorithm also includes a novel utilization of depolarization ratio profiles for sub-layer discrimination. Thus far, the algorithm has been applied to limited number of cases, resulting in a high degree of uncertainty compared to some more complex systems. The algorithm is thus merely a first step, and further refinements are suggested as a way to continue to improve its performance.
Science, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate

APA, Harvard, Vancouver, ISO, and other styles

42

Kumar, Atul. "Diffraction stress analysis of thin films; investigating elastic grain interaction." Stuttgart Max-Planck-Inst. für Metallforschung, 2005. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-24805.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Peters, James Edward II. "Group analysis of the nonlinear dynamic equations of elastic strings." Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/29348.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Steward, Julian Holmes. "Elastic analysis of load distribution in wide-faced spur gears." Thesis, University of Newcastle Upon Tyne, 1989. http://hdl.handle.net/10443/804.

Full text

Abstract:

The load distribution across the contact line(s) of spur gears is essential for the gear designer to be able to accurately stress gears for a given application. Existing gear standards (eg BS 436, AGMA 218 DIN 3990) use a thin slice (2D) model of the meshing gear teeth to estimate the contact line load distribution. This approach clearly fails to model properly teeth subjected to mal-distributed loads, since the buttressing effect of adjacent tooth sections tends to flatten the load distribution. Non-linear tooth modifications such as crowning and some forms of lead correction are also inadequately modelled. This thesis sets out the theory for a 3D elastic model of widefaced- spur gears that has been implemented on a micro-computer. The required 3D contact line influence coefficients for standard form zero modification spur gears with 18 to 100 teeth have been determined by Finite Element analysis. These theoretical values have been compared with results from experiments carried out on a complete large module (18. Omm) wide-faced spur gear. The effect of the various elemental gear errors (eg pitch, profile, lead) and profile modifications have been investigated using the 3D computer model; the results compared with results predicted by the existing gear design standards. The existing gear standards use 2D tooth compliance values up to 50% less than those obtained in this work, largely due to inadequate modelling of the gear body compliance, which is most significant in gear wheels. Comparison of 3D tooth compliance values shows a large discrepancy between author's results again due to inadequate modelling of the gear body.

APA, Harvard, Vancouver, ISO, and other styles

45

蘇啓亮 and Kai-leung Su. "Fractal two-level finite element method for elastic crack analysis." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31235323.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Yang, Chunhui, and 楊春暉. "Numerical and experimental damage analysis of elastic bodies containing defects." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B3124385X.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Munoz, Hermogenes Reyes. "Elastic second-order computer analysis of beam-columns and frames." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/25892.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

CARLETTI, RAFAEL CARREIRO. "ANALYTICAL MODEL FOR STABILITY ANALYSIS OF TUBES ON ELASTIC MEDIA." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2001. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=2507@1.

Full text

Abstract:

COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
Com o crescimento e avanço da indústria do petróleo há necessidade de se ter melhores condições de transporte para líquidos e gases. Há preocupações com a economia de materiais nas estruturas que os transportam e com as questões ambientais como vazamentos.Meios de transporte de líquidos e gases muito usados são dutos cilíndricos, tubulações apoiadas ou enterrados no solo. É muito importante conhecer melhor as propriedades estruturais dos cilindros, como boa estabilidade sob cargas de compressão e momentos.O avanço da análise computacional nos permite desenvolver modelos matemáticos sofisticados para a análise por Elementos Finitos.O estudo objetivou elaborar um arcabouço teórico para análise estrutural de dutos ou tubulações, com base em modelos de elementos finitos de viga (com efeitos de deformações axiais e de flexão), enriquecidos com modos de deformação de cascas cilíndricas. Esses modos deverão conter o modo assimétrico e alguns poucos modos de mudança de forma da seção transversal. O elemento finito desenvolvido terá formulação hierárquica com combinação de modos polinomiais e trigonométricos. Também será incluído o efeito de contenção do tubo em meio elástico do tipo Winkler. Foram estudados problemas básicos de análise estática e flambagem de tubos em meio elástico, utilizando-se um programa de computação numérica e simbólica (Mathcad), variandose a geometria dos tubos e as constantes do meio elástico. Os resultados obtidos foram as cargas críticas e respectivos modos de flambagem, que foram comparados com os resultados teóricos existentes.
With the growth and advance of the petroleum industry there is a need for better transportation facilities for liquid and gaseous materials. Concerns are raised with respect to savings in materials in structures and environmental problemas connected with failures and spills. Usual transportation media are cilindrical tubes, functioning as pipelines embedded in the soil or supported by it. It is quite important to know better the structural properties of cilinders, such as its stability when subjected to compressive forces and moments. The advances in computational analysis allow us to develop new sophisticated mathematical models for finite element analysis.The objective of this work is to provide an analytical model for structural analysis of pipelines, based on beam finite elements (including axial and bending deformation), enhanced with cylindrical shell deformation modes. The resulting finite element has a hierarchical formulation with combination of convencional polinomial modes and trigonometric functions. The effect of a Winkler- type elastic foundation is also included.Basic examples of static and buckling analysis of tubes in elastic media are studied, using a program for numerical and symbolic computation (Mathcad), varying the tube geometry and the foundation constants. The results obtained are critical loads and respective buckling modes, which are compared to the available theoretical results.

APA, Harvard, Vancouver, ISO, and other styles

49

SOBREIRA, GUSTAVO HENRIQUE OLIVEIRA. "EVALUATION OF ELASTIC PROPERTIES OF CARBONATIC ROCKS FROM MICROSTRUCTURAL ANALYSIS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=29612@1.

Full text

Abstract:

PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
Reservatórios carbonáticos contêm entre 50 e 60 porcento de petróleo e gás do mundo. No entanto, estas rochas têm apresentado problemas operacionais consideráveis durante as etapas de perfuração e produção. Tais problemas são originados pelas dificuldades na caracterização adequada destas rochas em função da complexa distribuição espacial de suas micro e macro estrutura. Enquanto ambas as escalas possuem importância no entendimento do comportamento de carbonatos, o presente trabalho trata da análise da microestrutura. Nesse âmbito, a proposta deste trabalho integra o processamento e análises de imagens digitais, elaboração de malhas de elementos finitos e simulação numérica de forma a prever propriedades elásticas, com o objetivo de correlacionar a microestrutura e o módulo de Young. Foram utilizadas imagens digitais de amostras de afloramento (travertinos) considerados como possíveis análogas a rochas carbonáticas de reservatório. A metodologia implementada permitiu obter subamostras que incluem uma gama de microestruturas e porosidades numa única amostra para assim simular numericamente o módulo de Young. Conclui-se neste estudo que os poros maiores (vuggys) são os principais responsáveis pelo comportamento do material quando o mesmo é carregado, e também a influência da estrutura porosa nos resultados, foi possível observar que a posição dos poros afeta o módulo de elasticidade do corpo de prova.
Carbonate reservoirs contain between 50 and 60 percent of oil and gas reserves in the world. However, these rocks have presented considerable operating problems during the phases of drilling and production. Such problems are originated by the difficulties in the proper characterization of these rocks due to the complex spatial distribution of its micro and macro structure. While both scales have importance on the carbonate behavior understanding, this paper deals with the analysis of the microstructure. In this context, the aim of this work is part of the processing and digital image analysis, mesh preparation and finite element numerical simulation to predict elastic properties, in order to correlate the microstructure and the Young s modulus. Using digital images of outcrop samples (travertine) considered as possible analogous to carbonate rocks reservoir. The methodology implemented afforded sub-samples that include a range of porosities and microstructures for a single sample well numerically simulate the Young s modulus. It is concluded in this study that the larger pores (vuggys) are mainly responsible for the behavior of the material when it is loaded, and also the influence of the porous structure in the results, it was observed that the position of pores affects the modulus of elasticity of sample.

APA, Harvard, Vancouver, ISO, and other styles

50

DOMINGUES, STELLA MARIS PIRES. "ANALYSIS OF BRITTLE ELASTIC MATERIALS THROUGH A CONTINUOUS DAMAGE MODEL." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1996. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33202@1.

Full text

Abstract:

COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Este trabalho lida com uma teoria de dano contínuo, desenvolvida em um contexto termodinâmico, capaz de realizar uma descrição macroscópica da degradação de um material induzida pela deformação em estruturas elásticas frágeis (isto é, falha ocorre sem deformações permanentes). Na modelagem, supõe-se que a energia livre de Helmholtz não depende apenas da deformação e da temperatura absoluta, mas também da variável dano e de seu gradiente. Além disso, para levar em conta os efeitos microscópicos, a potência dos esforços internos não depende apenas da velocidade e de seu gradiente, mas também da taxa de evolução do dano e de seu gradiente. Apesar da sofisticação mecânica da teoria, uma técnica numérica simples, baseada no método dos elementos finitos, é proposta para aproximar a solução dos problemas matemáticos não lineares resultantes. Nestes problemas o acoplamento entre as variáveis dano e deformação é contornado por meio da técnica de partição dos operadores. Para validar o modelo e investigar as características principais do método numérico, diversos exemplos são apresentados para mostrar que os algoritmos utilizados não são sensíveis à malha (mesh dependent).
The present work deals with a continuum damage theory, developed within a thennodynamical framework, able to perform a macroscopic description of material degradation induced by deformation in brittle elastic structures (i.e. failure occurs without permanent deformations). In the modeling, the Helmholtz free energy is supposed to depend not only on the strain and on the absolute temperature but on a damage variable and its gradient as well. Besides, to account for microscopic effects, the power of internal forces depends not only on the velocity and its gradient, but also on the damage velocity and its gradient. Despite the mechanical sophistication of the theory, a simple numerical technique, based on the únite element method, is proposed to approximate the solution of the resulting non linear mathematical problems. The coupling between damage and strain variables in these problems is circumvented by means of a splitting technique. In order to analyse the physical coherence of the model and to access the main features of the numerical method, a number of examples is presented showing that the numerical computations are not mesh dependent.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!