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Dissertations / Theses on the topic 'Crack Propagation Analysis'

Author: Grafiati

Published: 6 September 2023

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1

胡思來 and See-loi Wu. "Numerical analysis of dynamic crack propagation." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B31208459.

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2

Al-Falou, Ahmed Amir. "A theoretical analysis of crack propagation." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624858.

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3

Wu, See-loi. "Numerical analysis of dynamic crack propagation /." [Hong Kong] : University of Hong Kong, 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12354569.

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4

Perng, Jia-Der. "Analysis of crack propagation in asphalt concrete using a cohesive crack model." Connect to this title online, 1989. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1094737677.

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5

Tilbrook, Matthew Thomas Materials Science &amp Engineering Faculty of Science UNSW. "Fatigue crack propagation in functionally graded materials." Awarded by:University of New South Wales. Materials Science & Engineering, 2005. http://handle.unsw.edu.au/1959.4/21885.

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Propagation of cracks in functionally graded materials (FGMs) under cyclic loading was investigated via experiments and finite element (FE) analysis. Alumina-epoxy composites with an interpenetrating-network structure and tailored spatial variation in composition were produced via a multi-step infiltration technique. Compressed polyurethane foam was infiltrated with alumina slip. After foam burn-out and sintering, epoxy was infiltrated into the porous alumina body. Non-graded specimens with a range of compositions were produced, and elastic properties and fatigue behaviour were characterised.

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6

Nielsen, Kristin. "Crack Propagation in Cruciform Welded Joints : Study of Modern Analysis." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-145134.

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This thesis is investigating how the effective notch method can be used for fatigue assessment of welded joints. The effective notch method is based on a finite element analysis where the joint is modeled with all notches fictitiously rounded with a radius of 1 mm. Analyses are performed on a cruciform fillet welded joint where parameters such as, load case, steel plate thickness and weld size, are varied. The achieved lifetime estimations are then compared to calculations with other fatigue assessment methods, linear elastic fracture mechanics and the nominal method. The goal is to draw conc

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7

Kim, Dong Sub. "Analysis of fatigue crack propagation behavior of a surface crack at fillet toe of tubular joints /." The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487668215808373.

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8

Blandford, Robert. "Characterization of fatigue crack propagation in AA 7075-T651." Master's thesis, Mississippi State : Mississippi State University, 2001. http://library.msstate.edu/etd/show.asp?etd=etd-04092001-152127.

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9

Figiel, Lukasz. "Sensitivity Analysis of Interface Fatigue Crack Propagation in Elastic Composite Laminates." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2004. http://nbn-resolving.de/urn:nbn:de:swb:14-1102358246078-89903.

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Composite laminates are an important subject of modern technology and engineering. The most common mode of failure in these materials is probably interlaminar fracture (delamination). Delamination growth under applied fatigue loads usually leads to structural integrity loss of the composite laminate, and hence its catastrophic failure. It is known that several parameters can affect the fatigue fracture performance of laminates. These include the constituent material properties, composite geometry, fatigue load variables or environmental factors. The knowledge about effects of these parameters

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10

Echeverria, Molina Maria Ines. "Crack Analysis in Silicon Solar Cells." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4311.

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Solar cell business has been very critical and challenging since more efficient and low costs materials are required to decrease the costs and to increase the production yield for the amount of electrical energy converted from the Sun's energy. The silicon-based solar cell has proven to be the most efficient and cost-effective photovoltaic industrial device. However, the production cost of the solar cell increases due to the presence of cracks (internal as well as external) in the silicon wafer. The cracks of the wafer are monitored while fabricating the solar cell but the present monitoring t

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11

Sohrabi, Maria, and Loarte José Sanchez. "Crack propagation in concrete dams driven by internal water pressure." Thesis, KTH, Betongbyggnad, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-211648.

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Concrete structures are in general expected to be subjected to cracking during its service life. This is the reason why concrete is reinforced, where the reinforcement is only activated after cracks occur. However, cracks may be a concern in large concrete structures, such as dams, since it may result in reduced service life. The underlying mechanisms behind crack formations are well known at present day. On the other hand, information concerning the crack condition over time and its influence on the structure is limited, such as the influence of water pressure within the cracks. The aim of th

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12

Ueda, Naoshi, Minoru Kunieda, Hikaru Nakamura, and Khoa Kim Tran. "Analysis of crack propagation behavior in concrete due to multi-rebar corrosion." 土木学会, 2012. http://hdl.handle.net/2237/20868.

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13

Kunaporn, Chalitphan. "Probabilistic Analysis of a Thin-walled Beam with a Crack." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77072.

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It is reasonable to assume that an aircraft might experience some in-flight discrete source damage caused by various incidents. It is, thus, necessary to evaluate the impact of such damage on the performance of the aircraft. This study is focused on evaluating the effect of a simple discrete damage in an aircraft wing on its static and dynamic response. The damaged wing is modeled by a thin-walled beam with a longitudinal crack the response of which can be obtained analytically. As uncertainties are present in the location and size of the crack as well as in the applied loads, their effects ar

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14

Din, Khafilah Binti. "Fatigue crack propagation under variable amplitude loading analysed by fracture mechanics and finite element analysis." Thesis, University of Manchester, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334012.

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15

Hashtroodi, Seyedowjan. "Crack Propagation Analysis of a Pre-stressed L-shaped Spandrel Parking Garage Beam." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1420753991.

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16

Nešpůrek, Lukáš. "STOCHASTIC CRACK PROPAGATION MODELLING USING THE EXTENDED FINITE ELEMENT METHOD." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-233900.

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Tato disertační práce vychází z výzkumu v rámci francouzsko-českého programu doktorátu pod dvojím vedením na pracovišti Institut français de mécanique avancée v Clermont-Ferrand a na Ústavu fyziky materiálu AV v Brně. Úvodní výzkumný úkol na brněnském pracovišti se zabýval numerickou analýzou pole napětí v okolí čela trhliny v tenké kovové fólii. Zvláštní pozornost byla zaměřena na vliv speciálního typu singularity v průsečíku čela trhliny s volným povrchem. Těžiště disertační práce spočívá v numerickém modelování a stochastické analýze problémů šíření trhlin se složitou geometrií v dvojrozměr

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17

Nilsen, Oda Kulleseid. "Simulation of crack propagation using isogeometric analysis applied with NURBS and LR B-splines." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for matematiske fag, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19545.

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This report features the isogeometric finite element method applied to the elastodynamic problem in a brittle medium with a potential for cracking. Griffith's theory for fracturing is used. The development of the model is outlined, complete with the Euler-Lagrange equations. The cracking is described with a phase field supplemented with a history field, contrary to the usual way of building the crack directly into the geometry by modification of the basis, facilitating the use of isogeometric analysis even with simplistic basis functions such as Non-Uniform Rational B-Splines (NURBS). The intr

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18

Prawoto, Yunan. "LEFM based analysis of the effect of tensile residual macrostress on fatigue crack propagation /." free to MU campus, to others for purchase, 2000. http://wwwlib.umi.com/cr/mo/fullcit?p9974672.

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19

Butt, Ali. "Dynamic calibration and analysis of crack tip propagation in energetic materials using real-time radiography." Thesis, The University of Alabama in Huntsville, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1603134.

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<p> Crack propagation in a solid rocket motor environment is difficult to measure directly. This experimental and analytical study evaluated the viability of real-time radiography for detecting bore regression and propellant crack propagation speed. The scope included the quantitative interpretation of crack tip velocity from simulated radiographic images of a burning, center-perforated grain and actual real-time radiographs taken on a rapid-prototyped model that dynamically produced the surface movements modeled in the simulation. The simplified motor simulation portrayed a bore crack that

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20

Hütter, Geralf. "Multi-scale simulation of crack propagation in the ductile-brittle transition region." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2013. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-121281.

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In the present thesis the crack propagation in the ductile-brittle transition region is studied on two scales with deterministic models. In the macroscopic model the ductile failure is described by a non-local Gurson-model whereas the discrete void microstructure is resolved around the crack tip in the microscopic model. The failure by cleavage is not evaluated by means of a post-processing criterion but is modeled equivalently using a cohesive zone model on both scales. Thus, cleavage is not a priori identified with unstable crack propagation but the transition between stable and unstable mod

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21

Rouault, Thomas. "Propagation de coupure en fatigue sur composites tissés – Etude expérimentale et modélisation." Thesis, Toulouse, ISAE, 2013. http://www.theses.fr/2013ESAE0018/document.

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Les pales d’hélicoptère sont des structures composites soumises à un chargement cyclique multiaxial, et leur criticité impose de porter une attention particulière à la tolérance aux dommages. Leur revêtement peut potentiellement présenter des criques suite à certains évènements (impact, défaut, foudre). Ces travaux se focalisent sur un matériau de revêtement donné (tissu de verre) et concernent l’étude de la propagation de coupure (crique) sous chargement cyclique. Les sollicitations de service ont amené à considérer la traction et le cisaillement plan. Une étude expérimentale a été menée afin

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22

Karedla-Ravi, Shankar. "Modeling of crack tip high inertia zone in dynamic brittle fracture." Texas A&M University, 2003. http://hdl.handle.net/1969.1/5783.

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A phenomenological cohesive term is proposed and added to an existing cohesive constitutive law (by Roy and Dodds) to model the crack tip high inertia region proposed by Gao. The new term is attributed to fracture mechanisms that result in high energy dissipation around the crack tip and is assumed to be a function of external energy per volume input into the system. Finite element analysis is performed on PMMA with constant velocity boundary conditions and mesh discretization based on the work of Xu and Needleman. The cohesive model with the proposed dissipative term is only applied in the hi

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23

Fu, Chaoran, and Bjartmar Hafliðason. "Progressive failure analyses of concrete buttress dams : Influence of crack propagation on the structural dam safety." Thesis, KTH, Betongbyggnad, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-169707.

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Concrete buttress dams are the most common type of concrete dams for hydropower production in Sweden. Cracks have been observed in some of the them. However, only limited research has been made concerning the influence of these cracks on the structural dam safety. In conventional analytical stability calculations, a concrete dam is assumed to be a rigid body when its safety is verified. However, when cracks have been identified in a dam structure, the stability may be influenced and hence the information of cracks may need to be included in the stability calculations. The main aim of this proj

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24

Anyintuo, Thomas Becket. "Seepage-Coupled Finite Element Analysis of Stress Driven Rock Slope Failures for BothNatural and Induced Failures." Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7731.

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Rock slope failures leading to rock falls and rock slides are caused by a multitude of factors, including seismic activity, weathering, frost wedging, groundwater and thermal stressing. Although these causes are generally attributed as separate causes, some of them will often act together to cause rock slope failures. In this work, two of the above factors, seepage of water through cracks and crack propagation due to the after effects of blasting are considered. Their combined impact on the development of rock falls and rock slides is modeled on ANSYS workbench using the Bingham Canyon mine sl

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25

Malm, Richard. "Predicting shear type crack initiation and growth in concrete with non-linear finite element method." Doctoral thesis, KTH, Bro- och stålbyggnad, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10156.

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In this thesis, the possibility to numerically describing the behaviour that signifies shear type cracking in concrete is studied. Different means for describing cracking are evaluated where both methods proposed in design codes based on experiments and advanced finite element analyses with a non-linear material description are evaluated. It is shown that there is a large difference in the estimation of the crack width based on the calculation methods in design codes. The large difference occurs due to several of these methods do not account for shear friction in the crack face. The finite ele

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26

Ozcan, Riza. "Fatigue And Fracture Analysis Of Helicopter Fuselage Structures." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615497/index.pdf.

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In this study a methodology is developed for the fatigue and fracture analysis of helicopter fuselage structures, which are considered as the stiffened panels. The damage tolerance behavior of the stiffened panels multiaxially loaded is investigated by implementing virtual crack closure technique (VCCT). Validation of VCCT is done through comparison between numerical analysis and the studies from literature, which consists of stiffened panels uniaxially loaded and the panel with an inclined crack. A program based on Fortran programming language is developed to automate the crack growth analysi

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27

Davis, Timothy [Verfasser], Torsten [Akademischer Betreuer] Dahm, and Eleonora [Akademischer Betreuer] Rivalta. "An analytical and numerical analysis of fluid-filled crack propagation in three dimensions / Timothy Davis ; Torsten Dahm, Eleonora Rivalta." Potsdam : Universität Potsdam, 2021. http://d-nb.info/1236786645/34.

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28

Punnam, Pradeep Reddy, and Chitendar Reddy Dundeti. "A Finite Element Analysis of Crack Propagation in Interface of Aluminium Foil - LDPE Laminate During Fixed Arm Peel Test." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-14100.

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This thesis deals with numerical simulation of a peel test with an Aluminium foil and Low Density Poly-Ethylene (LDPE) laminate. This work investigates the effects of the substrate thickness and studies the influences of interfacial strength and fracture energy of the cohesive zone between the Aluminium and LDPE. This study evaluates the proper guidelines for defining cohesive properties. A numerical cohesive zone model was created in ABAQUS. Continuum tensile tests were performed to extract LDPE material properties. The aluminium properties were found in literature. After acquiring material p

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29

Li, Simin. "Cutting of cortical bone tissue : analysis of deformation and fracture process." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/13411.

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Cortical bone tissue - one of the most intriguing materials found in nature - demonstrate some fascinating behaviours that have attracted great attention of many researchers from all over the world. In contrast to engineering materials, bone has its unique characters: it is a material that has both sufficient stiffness and toughness to provide physical support and protection to internal organs and yet adaptively balanced for its weight and functional requirements. Its structure and mechanical properties are of great importance to the physiological functioning of the body. Still, our understand

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30

Aure, Temesgen W. "Numerical Analysis of Cracking in Concrete Pavements Subjected to Wheel Load and Thermal Curling." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1382427417.

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31

Shibanuma, Kazuki. "Reformulation of XFEM and its application to fatigue crack simulations in steel structures." 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/120941.

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32

Bayraktar, Funda Seniz [Verfasser], and Norbert [Akademischer Betreuer] Huber. "Analysis of residual stress and fatigue crack propagation behaviour in laser welded aerospace Aluminium T-joints / Funda Seniz Bayraktar. Betreuer: Norbert Huber." Hamburg-Harburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2012. http://d-nb.info/1048542289/34.

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33

Bayraktar, Funda Seniz Verfasser], and Norbert [Akademischer Betreuer] [Huber. "Analysis of residual stress and fatigue crack propagation behaviour in laser welded aerospace Aluminium T-joints / Funda Seniz Bayraktar. Betreuer: Norbert Huber." Hamburg-Harburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2012. http://nbn-resolving.de/urn:nbn:de:gbv:830-tubdok-11318.

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34

Ouagne, Pierre. "Fracture property changes with oxidation and irradiation in nuclear graphites." Thesis, University of Bath, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341675.

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35

Carvalho, Marcelo de Rezende. "Computational Framework for Fracture Simulation of Concrete Structures until Failure." Thesis, University of Sydney, 2019. https://hdl.handle.net/2123/23283.

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The need to predict the fractured behaviour of a structure with a high degree of certainty is becoming a significant problem in the construction industry, whether for designing new structures or for assessing and strengthening existing structures. Considerable advances in the construction industry – with the introduction of new materials and technologies and constant demand for safer, more cost-efficient, sustainable and bold designs – are overturning established design rules. It is becoming critical to bring new predictive tools to assure the safety and serviceability of these structures, and

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36

Wang, Xiaofeng. "Computational technology for damage and failure analysis of quasi-brittle materials." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/computational-technology-for-damage-and-failure-analysis-of-quasibrittle-materials(a7c91eb6-5058-4e73-95de-b2f3efd645d2).html.

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The thesis presents the development and validation of novel computational technology for modelling and analysis of damage and failure in quasi-brittle materials. The technology is demonstrated mostly on concrete, which is the most widely used quasi-brittle material exhibiting non-linear behaviour. Original algorithms and procedures for generating two-dimensional (2D) and three-dimensional (3D) heterogeneous material samples are developed, in which the mesoscale features of concrete, such as shape, size, volume fraction and spatial distribution of inclusions and pores/voids are randomised. Firs

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37

Robinson, Elinirina Iréna. "Filtering and uncertainty propagation methods for model-based prognosis." Thesis, Paris, CNAM, 2018. http://www.theses.fr/2018CNAM1189/document.

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Les travaux présentés dans ce mémoire concernent le développement de méthodes de pronostic à base de modèles. Le pronostic à base de modèles a pour but d'estimer le temps qu'il reste avant qu'un système ne soit défaillant, à partir d'un modèle physique de la dégradation du système. Ce temps de vie restant est appelé durée de résiduelle (RUL) du système.Le pronostic à base de modèle est composé de deux étapes principales : (i) estimation de l'état actuel de la dégradation et (ii) prédiction de l'état futur de la dégradation. La première étape, qui est une étape de filtrage, est réalisée à parti

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38

Hartmann, Christoph [Verfasser], Wolfram [Akademischer Betreuer] Volk, den Boogaard Ton [Gutachter] van, and Wolfram [Gutachter] Volk. "Spatio-temporal optical flow methods for process analysis : Robust strain, strain rate, and crack propagation measurement in shear cutting / Christoph Hartmann ; Gutachter: Ton van den Boogaard, Wolfram Volk ; Betreuer: Wolfram Volk." München : Universitätsbibliothek der TU München, 2020. http://d-nb.info/1240832680/34.

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39

Soares, Claudio Roberto. "Métodos numéricos aplicados a mecânica da fratura: avaliação da integridade estrutural de componentes nucleares." CNEN - Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, 2009. http://www.bdtd.cdtn.br//tde_busca/arquivo.php?codArquivo=114.

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Nenhuma<br>A tenacidade à fratura avalia a resistência à propagação de uma trinca e tornou-se uma importante propriedade a ser considerada em metodologias para avaliação de integridade estrutural de componentes mecânicos em geral. A principal metodologia para avaliação dos efeitos da perda de restrição à plasticidade (Teoria J-Q) representa um grande passo para a inclusão dos efeitos geométricos nos estudos da fratura. Alguns avanços têm sido propostos para a obtenção de um parâmetro para transferência de valores de tenacidade obtidos em laboratório para o componente estrutural real. Assim, ne

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40

Lee, Jonghee. "Fracture analysis of a propagating crack in a ductile material /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/7081.

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41

May, Daniel. "Transiente Methoden der Infrarot-Thermografie zur zerstörungsfreien Fehleranalytik in der mikroelektronischen Aufbau- und Verbindungstechnik." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-163082.

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In dieser Arbeit wurde eine neue fehleranalytische Methode zur industriellen Anwendung an neuen Technologien der Aufbau- und Verbindungstechnik entwickelt. Das Verfahren basiert auf der Wechselwirkung von thermischen Wellen und Defekten. Die Besonderheit ist dabei die Zerstörungsfreiheit, die Geschwindigkeit, das Auflösungsvermögen und die durch neueste IR-Detektoren erreichte Temperaturempfindlichkeit. Es wurden grundlegende Studien bezüglich Auflösung und parasitären Effekten bei der Anwendung unter industriellen Randbedingungen durchgeführt. Dabei wurde eine systematische Vorgehensweise bez

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42

Cordeiro, Sérgio Gustavo Ferreira. "Contribuições às análises de fratura e fadiga de componentes tridimensionais pelo Método dos Elementos de Contorno Dual." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-05062018-104832/.

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O presente trabalho consiste no desenvolvimento de uma ferramenta computacional para análises de fratura e fadiga de componentes tridimensionais a partir de modelos geométricos de Desenho Assistido por Computador (CAD, acrônimo do inglês). Modelos de propagação de fissuras associados a leis empíricas de fadiga permitem a determinação da vida útil de peças mecânico-estruturais. Tais análises são de vital importância para garantir a segurança estrutural em diversos projetos de engenharia tais como os de pontes, plataformas off-shore e aeronaves. No entanto, a criação de modelos de análise a part

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43

Aminpour, Mohammad Ali. "Finite element analysis of propagating interface cracks in composites /." Thesis, Connect to this title online; UW restricted, 1986. http://hdl.handle.net/1773/9993.

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44

Ahmadivala, Morteza. "Vers une planification optimale de la maintenance des structures existantes sur la base d'une analyse de fiabilité en fonction du temps." Thesis, Université Clermont Auvergne‎ (2017-2020), 2020. http://theses.bu.uca.fr/nondiff/2020CLFAC056_AHMADIVALA.pdf.

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Les structures de génie civil jouent un rôle important dans tout pays pour améliorer l'économie ainsi que le bien-être social et environnemental. Une défaillance indésirable peut avoir des impacts significatifs à différents niveaux pour le propriétaire de la structure et pour les utilisateurs. La fatigue est l'un des principaux processus de dégradation des structures en acier qui provoque une défaillance structurelle avant la fin de la durée de vie prévue. Pour éviter des défaillances imprévues à cause de la fatigue, une Gestion complète du Cycle de Vie structurelle (GCV) est nécessaire pour m

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45

Rodrigues, Eduardo Alexandre. "Um modelo multiescala concorrente para representar o processo de fissuração do concreto." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3144/tde-10052016-113532/.

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Este trabalho propõe uma técnica de modelagem multiescala concorrente do concreto considerando duas escalas distintas: a mesoescala, onde o concreto é modelado como um material heterogêneo, e a macroescala, na qual o concreto é tratado como um material homogêneo. A heterogeneidade da estrutura mesoscópica do concreto é idealizada considerando três fases distintas, compostas pelos agregados graúdos e argamassa (matriz), estes considerados materiais homogêneos, e zona de transição interfacial (ZTI), tratada como a parte mais fraca entre as três fases. O agregado graúdo é gerado a partir de uma c

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46

Klimis, Nikolaos. "Etude en laboratoire de l'attenuation des ondes longitudinales : application a la caracterisation geotechnique des roches." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0054.

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Etude en laboratoire de roche par essais non destructifs. On s'interesse aux differentes causes d'attenuation d'une onde longitudinale. Pour des roches plutoniques, la diffraction sur grains domine; pour un calcaire cristallin, l'attenuation suit l'evolution du champ microfissural; pour une roche poreuse, l'attenuation est influencee par la dimension du milieu poreux; l'attenuation augmente par ailleurs avec l'alteration; essai sur une aplite

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47

Papamichail, Chrysanthi. "Estimation of dynamical systems with application in mechanics." Thesis, Compiègne, 2016. http://www.theses.fr/2016COMP2284.

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Cette thèse porte sur inférence statistique, les méthodes bootstrap et l’analyse multivariée dans le cadre des processus semi-markoviens. Les applications principales concernent un problème de la mécanique de la rupture. Ce travail a une contribution double. La première partie concerne la modélisation stochastique du phénomène de la propagation de fissure de fatigue. Une équation différentielle stochastique décrit le mécanisme de la dégradation et le caractère aléatoire inné du phénomène est traité par un processus de perturbation. Sous l'hypothèse que ce processus soit un processus markovien

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48

Staudinger, Ulrike. "Morphologie und Bruchverhalten von Block- und Multipfropfcopolymeren." Doctoral thesis, [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1187261828675-34703.

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Mattrand, Cécile. "Approche probabiliste de la tolérance aux dommages." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2011. http://tel.archives-ouvertes.fr/tel-00738947.

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En raison de la gravité des accidents liés au phénomène de fatigue-propagation de fissure, les préoccupations de l'industrie aéronautique à assurer l'intégrité des structures soumises à ce mode de sollicitation revêtent un caractère tout à fait essentiel. Les travaux de thèse présentés dans ce mémoire visent à appréhender le problème de sûreté des structures aéronautiques dimensionnées en tolérance aux dommages sous l'angle probabiliste. La formulation et l'application d'une approche fiabiliste menant à des processus de conception et de maintenance fiables des structures aéronautiques en conte

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Wen-ChengYeh and 葉文正. "Analysis of Crack Stress Intensity Factors and Stochastic Modeling of Crack Propagation." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/15526261102343701788.

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