Дисертації з теми "Small Fatigue Crack Growth"
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Li, Xu-Dong. "On kinetics of small fatigue crack growth." Thesis, Open University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296607.
Повний текст джерелаZhang, Y. H. "Small fatigue crack growth in high strength aluminium alloys." Thesis, Open University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314821.
Повний текст джерелаHennessey, Conor Daniel. "Modeling microstructurally small crack growth in Al 7075-T6." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53947.
Повний текст джерелаJin, Ohchang. "The characterization of small fatigue crack growth in PH13-8 Mo stainless steel." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/19633.
Повний текст джерелаGockel, Brian Timothy. "Developing the capability to examine environmental effects on small fatigue crack growth." Dayton, Ohio : University of Dayton, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1271184488.
Повний текст джерелаTitle from PDF t.p. (viewed 06/22/10). Advisor: Robert Brockman. Includes bibliographical references (p. 42-44). Available online via the OhioLINK ETD Center.
Goulding, A. "Small fatigue crack growth in a near alpha titanium alloy : crack closure, stress gradient and temperature considerations." Thesis, Swansea University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637082.
Повний текст джерелаSteadman, David Lawrence. "Growth-arrest behavior of small fatigue cracks." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/11731.
Повний текст джерелаGalland, Florent. "An adaptive model reduction approach for 3D fatigue crack growth in small scale yielding conditions." Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00596397.
Повний текст джерелаWard, D'Anthony Allen. "The Effect of Dwell Loading on the Small Fatigue Crack Growth at Notches in IN100." University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1355235018.
Повний текст джерелаJohnston, Stephen R. "FINITE ELEMENT SIMULATIONS OF THREE-DIMENSIONAL MICROSTRUCTURALLY SMALL FATIGUE CRACK GROWTH IN 7075 ALUMINUM ALLOY USING CRYSTAL PLASTICITY THEORY." MSSTATE, 2005. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10242005-133331/.
Повний текст джерелаPatel, Akshay Mahesh. "Growth of small fatigue cracks in PH 13-8 Mo stainless steel." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/18185.
Повний текст джерелаLocke, W. R. "The growth of small fatigue cracks under conditions of confined notch plasticity." Thesis, University of Portsmouth, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303183.
Повний текст джерелаSalgado, Goncalves Flora. "Caractérisation expérimentale et modélisation des interactions entre fissures et perçages multiples à haute température en élastoplasticité généralisée ou confinée." Thesis, Paris, ENMP, 2013. http://www.theses.fr/2013ENMP0094/document.
Повний текст джерелаThe purpose of this study is to investigate crack growth of multi-perforated structures when loading can vary from small scale yielding to large scale yielding conditions. In this study we focus on combustion chambers of aerospace engines. The material used in crack growth tests is the Haynes 188, a cobalt based superalloy, specially developed for this type of applications. Studies on crack growth of multi-perforated structures are often made in small scale yielding conditions. These studies have to be extended to large scale yielding conditions.In order to study interactions between cracks and perforations, an original specimen has been developed. The specimen is perforated in the center by three holes inspired by cooling holes of combustion chambers. Fatigue crack growth tests at 900°C have been conducted with loads from small scale to large scale yielding conditions. These tests were used to study life of a base pattern. Using experimental stresses and strains, tests were modeled at a macroscopic scale with an energy based crack growth model. In order to improve experimental results description, tests were modeled at an intermediate mesoscopic scale using finite element calculations
Kuběna, Ivo. "Early Stages of Fatigue Damage of Steels for Fusion Energetics." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-234021.
Повний текст джерелаJunet, Arnaud. "Étude tridimensionnelle de la propagation en fatigue de fissures internes dans les matériaux métalliques." Thesis, Lyon, 2021. http://www.theses.fr/2021LYSEI006.
Повний текст джерелаFatigue is the main phenomenon causing the failure of mechanical structures. For very long service lives the initiation of cracks leading to the failure of in service mechanical parts changes from surface to volume. Due to experimental difficulties the propagation of internal cracks has only been studied to a limited extent in situ and in 3D. However, it is crucial from a dimensional point of view to know the behaviour of such cracks. In this work, in situ monitoring of the initiation and propagation of internal cracks was carried out by X-ray tomography (synchrotron source). Firstly, a method for manufacturing specimens was developed to enable systematic, non-destructive, and 3D visualization of the propagation of internal cracks in a titanium alloy (Ti-6Al-4V) at 20 Hz. For this purpose, an artificial defect was drilled on the surface of a rolled sheet of this material. A second sheet, placed on top of the first one, was diffusion bonded by spark plasma sintering, making it possible to make the defect volumetric. In situ fatigue tests showed the crucial role of the environment (vacuum) and, to a lesser extent, that of the crystallographic texture on the internal crack propagation rates. Secondly, an ultrasonic fatigue machine (cycling frequency of 20 kHz) allowing in situ testing at the synchrotron was used to study the 3D propagation of internal cracks in A357-T6 aluminium alloy specimens containing an artificial internal defect. The 3D grain distribution obtained by Diffraction Contrast Tomography (DCT) was used to study the interaction mechanisms between the microstructure and the 3D crack path
Ahmad, Haider Yousif. "Fatigue crack growth at notches." Thesis, University of Sheffield, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360410.
Повний текст джерелаVethe, Stine. "NUMERICAL SIMULATION OF FATIGUE CRACK GROWTH." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for produktutvikling og materialer, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18721.
Повний текст джерелаChambers, A. C. "Mixed mode creep/fatigue crack growth." Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328464.
Повний текст джерелаRatsimba, Christian H. H. "Fatigue crack growth of filled elastomers." Thesis, Queen Mary, University of London, 2000. http://qmro.qmul.ac.uk/xmlui/handle/123456789/26243.
Повний текст джерелаLin, Xiaobin. "Numerical simulation of fatigue crack growth." Thesis, University of Sheffield, 1995. http://etheses.whiterose.ac.uk/14437/.
Повний текст джерелаVerma, Dhirendra. "Stochastic modeling of fatigue crack growth." Case Western Reserve University School of Graduate Studies / OhioLINK, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=case1054565393.
Повний текст джерелаZhang, Hong Carleton University Dissertation Engineering Mechanical. "Fatigue crack growth and coalescence study." Ottawa, 1993.
Знайти повний текст джерелаNosair, S. I. M. "Fatigue crack growth in aluminium alloy structures." Thesis, University of Salford, 1986. http://usir.salford.ac.uk/26840/.
Повний текст джерелаLjustell, Pär. "On predictions of fatigue crack growth rates /." Stockholm : Royal Institute of Technology, Department of Solid Mechanics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-281.
Повний текст джерелаChahardehi, Amir Ebrahim. "Fatigue Crack Growth in Complex Stress Fields." Thesis, Cranfield University, 2008. http://hdl.handle.net/1826/3481.
Повний текст джерелаHenderson, M. B. "Fatigue crack growth in single crystal superalloys." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314993.
Повний текст джерелаMonahan, Craig C. "Early fatigue crack growth in offshore structures." Thesis, University College London (University of London), 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271908.
Повний текст джерелаIsogai, Takeshi. "Creep-fatigue crack growth in engineering materials." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627408.
Повний текст джерелаBold, P. E. "Multiaxial fatigue crack growth in rail steel." Thesis, University of Sheffield, 1990. http://etheses.whiterose.ac.uk/14807/.
Повний текст джерелаGeary, W. "Fatigue crack growth in iron silicon alloys." Thesis, Sheffield Hallam University, 1985. http://shura.shu.ac.uk/20609/.
Повний текст джерелаShademan, Sassan Steven. "Mechanism-based models of fatigue crack growth /." The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488203857249745.
Повний текст джерелаDoré, Matthew James. "An investigation of fatigue crack growth acceleration." Thesis, Open University, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.700486.
Повний текст джерелаHu, Haiyun. "Fatigue and corrosion fatigue crack growth resistance of RQT501 steel." Thesis, University of Sheffield, 1997. http://etheses.whiterose.ac.uk/5999/.
Повний текст джерелаMohin, Ma. "Fatigue crack growth assessment and fatigue resistance enhancement of aluminium alloys." Thesis, University of Hertfordshire, 2018. http://hdl.handle.net/2299/20824.
Повний текст джерелаNagaralu, Ramesh. "Fatigue Crack Growth Under Residual Stresses Around Holes." MSSTATE, 2005. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11112005-143754/.
Повний текст джерелаDamri, Daniel. "Transient fatigue crack growth in a structural steel." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386012.
Повний текст джерелаFerreira, João Guilherme Gaspar Cordeiro. "Numerical modelling of fatigue crack growth using XFEM." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14344.
Повний текст джерелаThe Finite Element Method (FEM) is one of the most efficient tools used, in computational solid mechanics, for the numerical solution of Partial Differential Equations (PDE). This numerical technique has been extensively used in the past decades for finding approximate solutions to PDE in both engineering and science fields. A main feature of the FEM is the subdivision of a continuum into a discrete set of elements, being these elements connected by a topological map, usually referred to as the finite element mesh. The FEM can generally be used to model and predict the behaviour of continuous structures. However, problems arise when FEM is used on a domain with a discontinuity (like a crack). In this case, it is usual to use adaptive mesh refinement around the discontinuity. This process works ne, but has a very high computational cost. Alternatively, the eXtended Finite Element Method (XFEM) is a numerical method for modelling strong and weak discontinuities using local enrichment. It is a FEM generalization that enables the incorporation of local enrichment of approximation spaces. This enrichment is done through the partition of unity concept by adding special functions to the finite element approximation. For crack modelling in isotropic linear elasticity, the Heaviside function is used to enrich the completely cut elements and an asymptotic function is used to enrich the crack tip elements. This enrichment creates new degrees of freedom that must be integrated into the analysis during a post-processing step. This enables the domain to be modelled without explicitly meshing the crack surfaces and without a remeshing process for the crack propagation. In this context, this work addresses the main concepts of FEM and XFEM, the creation of a pedagogical XFEM software (with its numerical implementation process and software manual) and the differences between a standard FEM implementation and a XFEM program. Finally, some numerical results of the XFEM application are presented.
O Método dos Elementos Finitos (Finite Element Method - FEM) é uma das ferramentas mais eficientes para a obtenção de soluções numéricas de Equações Diferenciais Parciais (EDP) em mecânica dos sólidos computacional. Esta técnica numérica tem vindo a ser utilizada extensivamente durante as últimas décadas para a obtenção de soluções aproximadas de EDP, tanto a nível de engenharia como a nível científico. Uma das principais características do FEM é a subdivisão de um meio contínuo numa série de elementos discretos, estando esses elementos ligados por um mapa topológico, normalmente referido como malha dos elementos finitos. O FEM é utilizado geralmente para modelar e prever o comportamento de estruturas contínuas. Contudo, surgem problemas quando o FEM é utilizado em domínios que contenham descontinuidades (tais como fendas). Neste caso, é normalmente utilizado um refinamento de malha adaptativo em torno da descontinuidade. Este processo funciona perfeitamente, mas acarreta um enorme custo computacional. Alternativamente, o Método dos Elementos Finitos Estendidos (eXtended Finite Element Method - XFEM) é um método numérico utilizado para modelar descontinuidades fortes e fracas, utilizando enriquecimento local. É uma generalização do FEM que permite a incorporação de enriquecimento local de aproximação de espaços. Este enriquecimento é feito através do conceito de partição de unidade, ao adicionar funções especiais à aproximação por elementos finitos. Para a modelação de uma fenda em regime linear elástico isotrópico, é utilizada a função de Heaviside para enriquecer os elementos que são completamente cortados pela fenda, e a função assimptótica para enriquecer os elementos que contenham a ponta de fenda. Este processo de enriquecimento cria novos graus de liberdade que têm de ser incorporados no sistema, através de uma etapa de pós-processamento. Isto permite que o domínio possa ser modelado, sem que exista a preocupação de fazer coincidir a malha com a localização da fenda, e que seja preciso recorrer a um processo de remalhamento caso exista propagação da fenda. Neste contexto, o presente trabalho aborda os principais conceitos de FEM e XFEM, a criação de um software pedagógico de XFEM (com o seu processo de implementação numérica e manual do software) e as principais diferenças entre a implementação padrão do FEM e um programa de XFEM. Finalmente, são apresentados alguns resultados numéricos da aplicação do XFEM.
McFadyen, Neil B. (Neil Barry) Carleton University Dissertation Engineering Mechanical. "Fatigue crack growth in semi-elliptical surface cracks." Ottawa, 1987.
Знайти повний текст джерелаBian, Lichun, and 卞立春. "Fatigue crack growth analysis of metallic plates with an inclinedsemi-elliptical crack." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31242844.
Повний текст джерелаSabuncuoglu, Baris. "Fatigue Crack Growth Analysis Models For Functionally Graded Materials." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12607024/index.pdf.
Повний текст джерелаinfluence for a certain number of cyclic loading.
De, Noronha Motta Carlos Henrique. "A fatigue crack growth model with mean stress effects." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq21163.pdf.
Повний текст джерелаLaRue, James Edward. "The Influence of Residual Stress on Fatigue Crack Growth." MSSTATE, 2005. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04072005-095303/.
Повний текст джерелаAdair, Benjamin Scott. "Thermo-mechanical fatigue crack growth of a polycrystalline superalloy." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/46027.
Повний текст джерелаWoollin, Paul. "Aspects of fatigue crack growth in nickel-based superalloys." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316765.
Повний текст джерелаYang, Rong. "Creep-fatigue crack growth in a nickel base superalloy." Thesis, Imperial College London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320941.
Повний текст джерелаHall, Rodney H. F. "Crack growth under combined high and low cycle fatigue." Thesis, University of Portsmouth, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290404.
Повний текст джерелаHawkyard, Miles. "The fatigue crack growth resistance of Ti-6Al-4V." Thesis, University of Portsmouth, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339512.
Повний текст джерелаDodd, A. "Fatigue crack growth in an aluminium-lithium (8090) alloy." Thesis, University of Nottingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381174.
Повний текст джерелаStacey, A. "Prediction of fatigue crack growth in thick-walled tubing." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37864.
Повний текст джерелаHughes, Rachelle J. (Rachelle Jane) 1974. "Fatigue crack growth of Incoloy 908 at high temperature." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/85272.
Повний текст джерелаIncludes bibliographical references (leaves 155-159).
by Rachelle J. Hughes.
S.M.