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Dissertations / Theses on the topic 'Crack initiation and propagation'

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Published: 4 June 2021

Last updated: 15 February 2022

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1

Burman, Magnus. "Fatigue crack initiation and propagation in sandwich structures." Doctoral thesis, KTH, Flygteknik, 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2696.

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The focus throughout this thesis is on the fatigue characteristics of core materials used insandwich structures. Three sandwich configurations are investigated, two with cellular foamsand one with honeycomb core material These corresponds to typical materials and dimensionsused in the marine and aeronautical industry.A modified four-point bending rig, which enables reversed loading, is successfully used forconstant amplitude fatigue tests of all material configurations. The core materials are tested asused in composite sandwich beams and through the design of the specimens the desiredfailure i

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2

Hejman, Ulf. "On initiation of chemically assisted crack growth and crack propagation paths of branching cracks in polycarbonate." Licentiate thesis, Malmö högskola, Teknik och samhälle, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-7790.

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Stress corrosion, SC, in some cases gives rise to stress corrosion cracking, SCC, which differs from purely stress intensity driven cracks in many aspects. They initiate and grow under the influence of an aggressive environment in a stressed substrate. They grow at low load and may branch. The phenomenon of SCC is very complex, both the initiation phase and crack extension itself of SCC is seemingly associated with arbitrariness due to the many unknown factors controlling the process. Such factors could be concentration of species in the environment, stress, stress concentration, electrical co

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3

Zhai, Zhen-Hua. "A study of fatigue crack initiation and early propagation /." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75900.

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This thesis proposes a quantitative model of fatigue crack initiation and early propagation based on a plastic strain intensity factor $ Delta{K} sb{p}$. In this model, the crack growth rate in the initiation region is simplified as a straight line on the log-log scale of da/dN verses $ Delta{K} sb{p}$ curve. A turning point which divides crack growth into the initiation and propagation regions is introduced as the plastic crack propagation threshold, $ Delta{K} sb{pth}$, whose value is determined by the plastic crack propagation threshold in the $ Delta{J}$-integral form, $ sqrt{ Delta{J} cdo

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4

Yu, Ligang. "Orthotropic damage models for fatigue crack initiation and propagation /." [Hong Kong : University of Hong Kong], 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13570377.

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5

Gonçalves, da Silva Bruno Miguel. "Modeling of crack initiation, propagation and coalescence in rocks." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/55156.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 254-260).<br>Natural or artificial fracturing of rock plays a very important role in geologic processes and for engineered structures in and on rock. Fracturing is associated with crack initiation, propagation and coalescence, which have been studied experimentally and analytically by many researchers. The analytical models developed to describe the initiation and propagation of cracks in brittle materials

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6

Noury, Philippe. "Shear crack initiation and propagation in foam core sandwich structures." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326642.

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7

Keller, Scott. "Creep-Fatigue Crack Initiation and Propagation of a Notched Stainless Steel." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5659.

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Premature failures of vital gas turbine components, such as blades and vanes, have been the result of increasing demands of power generation facilities. As power needs fluctuate throughout the day, operators are quickly firing up gas turbines as a means of providing instant power. Traditionally, these engines run at constant operating conditions; however, contemporary operating conditions call for these engines to be applied on an “as necessary” basis. The result of the cyclic startup and shutdown of gas turbines has led to a phenomenon known as creep-fatigue (CF). A coupling of two primar

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8

Dharmarajan, Vignesh. "An Investigation on Spur Gear Rolling Contact Fatigue Crack Initiation and Crack Propagation under EHL Condition." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1578319670376195.

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9

Andrews, Robert G. (Robert Garth) Carleton University Dissertation Engineering Mechanical. "High temperature fatigue crack initiation and propagation behaviour in Inconel 718 turbine discs." Ottawa, 1991.

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10

Bhattacharjee, Debashish. "Micromechanisms of fracture under mixed mode I and II loading." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320000.

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11

Abdul-Wahab, Mokbel Amin. "Grinding of advanced ceramic materials : experimental and theoretical investigation into crack initiation and propagation." Thesis, University of South Wales, 1997. https://pure.southwales.ac.uk/en/studentthesis/grinding-of-advanced-ceramic-materials(a7b89f2f-fef0-4e4a-85f8-1a01f1069bfe).html.

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Advanced ceramic materials are assuming increasing industrial importance because of their special properties. However, the extreme hardness and brittleness of these materials make their machining efficiency low. The difficulty arises from shaping ceramics whilst conserving their surface integrity, strength and high quality surface finish. Manufacturing processes such as grinding with diamond bonded wheels present one solution. The use of a diamond grinding wheel on the surface of ceramics, creates a complex system of elastic/plastic deformation, and subsequent cracking. For ceramic materials s

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12

Sirimamilla, Pavana Abhiram. "MECHANISTIC STUDY OF CRACK INITIATION AND PROPAGATION IN CROSSLINKED ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENES (UHMWPE) SUBJECTED TO STATIC AND CYCLIC LOADING." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1345862222.

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13

Bogdanoff, Toni. "The influence of microstructure on the crack initiation and propagation in Al-Si casting alloys." Licentiate thesis, Jönköping University, JTH, Material och tillverkning, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-52087.

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For reducing the CO2 footprint in many industrial fields, the goal is to produce lighter components. The aluminium-silicon (Al-Si) cast alloys are promising candidates to fulfill these goals with a high weight-to-strength ratio, good corrosion properties, excellent castability, and recyclable material. However, the variations within these components need to be understood to produce high-performance components for critical applications. The main reason for the rejection in these applications is defects and microstructural features that reduce the mechanical properties. The addition of copper (C

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14

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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15

Pommier, Sylvie. "Amorçage et propagation de fissures courtes en fond d'entaille : étude du superalliage base nickel N18 en fatigue fluage à 650°C." Châtenay-Malabry, Ecole centrale de Paris, 1995. http://www.theses.fr/1995ECAP0422.

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Le matériau étudié est le superalliage base nickel n18, élaboré par métallurgie des poudres MDP. La présence d'inclusions exogènes en fond d'entaille peut entrainer l'amorçage très précoce de petites fissures. En premier lieu, un dispositif d'essai a été mis en œuvre pour pouvoir mesurer la propagation à 650°C de fissures semi-elliptique en fond d'entaille dont la taille est comprise entre 100 m et 1 mm. D’autre part une étude approfondie de l'état de contrainte et de déformation dans la structure entaillée, en prenant en compte le comportement élastoviscoplastique du matériau a été conduite.

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16

Jiang, Rong. "Study of fatigue crack initiation and propagation mechanisms in an advanced Ni-based superalloy : effects of microstructures and oxidation." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/386208/.

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Low Solvus, High Refractory (LSHR) alloy is a latest generation of turbine disc alloy which contains relatively high Co and Cr levels compared with incumbent alloys, this provides a low solvus temperature for enhanced high temperature processing versatility, and the alloy is designed to operate at higher temperatures to achieve higher thrust-to-weight ratio and higher fuel efficiency. Understanding the fatigue performance of the LSHR alloy along with the coupled influences of deformation and oxidation damage is important for both its practical application and in further development of turbine

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17

Joudon, Vincent. "Caractérisation expérimentale de l'initiation et de la propagation de fissure dans une résine époxy sous chargement dynamique." Thesis, Valenciennes, 2014. http://www.theses.fr/2014VALE0029/document.

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Les résines époxy renforcées par des nodules thermoplastiques sont largement utilisées dans les matériaux composites à matrice organique de l’industrie aéronautique. Dans le cas particulier des stratifiés, les résines époxy déterminent la résistance du milieu inter-laminaire au délaminage. Ce processus de décohésion macroscopique apparaît classiquement lors d’un impact dynamique et compromet fortement l’intégrité des structures composites légères. Pourtant, les modèles cohésifs actuels ne sont pas prévus pour la simulation du délaminage sous sollicitation rapide. Notamment, l’influence présumé

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18

Roungos, Ioannis C. "The effect of sequential action of corrosion and fatigue on fatigue crack initiation and propagation in 2024-T3 aluminium alloy." Thesis, Cranfield University, 1997. http://dspace.lib.cranfield.ac.uk/handle/1826/11122.

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The influence of sequential action of corrosion and fatigue on fatigue behaviour of 2024- T3 aluminium alloy was investigated. EXCO solution was used for corrosion development. Corrosion evolution and penetration were investigated in terms of exposure time, dimensional characteristics, orientation, microstructure of material, incremental corrosion application and sequential application of corrosion and fatigue. Single Edge Notch Tensile specimens were used in the fatigue-corrosion tests. Fatigue intervals were interrupted by corrosion application. Four fatigue intervals and four corrosion segm

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Roungos, I. C. "The effect of sequential action of corrosion and fatigue on fatigue crack initiation and propagation in 2024-T3 aluminium alloy." Thesis, Cranfield University, 1997. http://dspace.lib.cranfield.ac.uk/handle/1826/11122.

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The influence of sequential action of corrosion and fatigue on fatigue behaviour of 2024- T3 aluminium alloy was investigated. EXCO solution was used for corrosion development. Corrosion evolution and penetration were investigated in terms of exposure time, dimensional characteristics, orientation, microstructure of material, incremental corrosion application and sequential application of corrosion and fatigue. Single Edge Notch Tensile specimens were used in the fatigue-corrosion tests. Fatigue intervals were interrupted by corrosion application. Four fatigue intervals and four corrosion segm

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20

Neumann, James 1958. "THE INITIATION AND PROPAGATION OF HERTZIAN AND RADIAL CRACKS IN NICKEL-ZINC FERRITE." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/276523.

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This investigation was initiated by IBM to determine the types of cracks formed in hot-isostatic-pressed (HIP) Ni-Zn ferrite under impact and static loading conditions. A 1/8-inch tungsten carbide (WC) ball was used to apply the load in both cases. The impact loading condition was accomplished by dropping the WC ball from various heights between 40 and 200 cm. The static loading condition was accomplished by applying loads of 10 kg, 15 kg, and 30 kg on a Rockwell Hardness Tester. The response of HIP Ni-Zn ferrite to impact and static loading was elastic/plastic yielding permanent indentations.

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21

Fan, Zhengxuan. "Atomistic simulation of fatigue in face centred cubic metals." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX076/document.

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La fatigue induite par chargement cyclique est un mode d'endommagement majeur des métaux. Elle se caractérise par des effets environnementaux et de grandes dispersions de la durée de vie qui doivent être mieux comprises. Les matériaux analysés sont de type cfc : aluminium, cuivre, nickel et argent. Le comportement de marches naturellement créées en surface par le glissement cyclique de dislocations est examiné par simulations en dynamique moléculaire sous vide et sous environnement oxygène pour le cuivre et le nickel. Un phénomène de reconstruction est observé sur les marches en surface, qui p

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22

Li, Jinxia. "THE EFFECT OF MICROSTRUCTURE AND TEXTURE ON HIGH CYCLE FATIGUE PROPERTIES OF AL ALLOYS." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_diss/522.

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High cycle fatigue tests were carried out on a medium strength continuous casting AA 5754 Al alloy, and new generation high strength AA 2026 and AA 2099 Al alloys. The effect of texture on fatigue properties and short crack behavior were studied. The strengthening mechanisms were also thoroughly investigated for the two high strength alloys.Texture played an important role in the anisotropy of fatigue strength for the AA 5754 Al alloy. Being a solution strengthened alloy, it had a fatigue strength of 120% σy. High strength Al alloys had a strong tendency for planar slip due to the high density

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23

Wen, Wei. "A THREE-DIMENSIONAL QUANTITATIVE UNDERSTANDING OF SHORT FATIGUE CRACK GROWTH IN HIGH STRENGTH ALUMINUM ALLOYS." UKnowledge, 2013. http://uknowledge.uky.edu/cme_etds/18.

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The behaviors of short fatigue crack (SFC) propagation through grain boundaries (GBs) were monitored during high cycle fatigue in an Al-Li alloy AA8090. The growth behaviors of SFCs were found to be mainly controlled by the twist components (α) of crack plane deflection across each of up to first 20 GBs along the crack path. The crack plane twist at the GB can result in a resistance against SFC growth; therefore SFC propagation preferred to follow a path with minimum α at each GB. In addition to the grain orientation, the tilting of GB could also affect α. An experiment focusing on quantifying

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24

Cusset, Raphael. "Effet du formage à froid sur la tenue en fatigue à la propagation d'une structure d'alliage Al2024T351." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEM036/document.

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Le groupe Dassault Aviation conçoit et construit chaque année un large choix de modèles d’avions, à la fois à usage privé comme à usage militaire. Nous nous intéressons ici à certaines pièces structurelles de l'avion, se présentant sous la forme de panneaux renforcés de raidisseurs usinés directement dans la masse de tôles épaisses en alliage Al2024T351. Dans le cadre du processus de mise en forme, ces éléments doivent être formées à froid afin de leur donner une courbure définitive. Ce procédé a pour conséquence de pré-déformer sévèrement certaines régions de la structure. De plus, ces zones

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25

Recho, Naman. "Amorçage et propagation d'une fissure de fatigue des éléments de structures métalliques soudés." Paris 6, 1987. http://www.theses.fr/1987PA066198.

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26

Varadarajan, Ravikumar. "On the Nature of Static and Cyclic Fracture Resistance of Ultra High Molecular Weight Polyethylenes Used in Total Joint Replacements." Case Western Reserve University School of Graduate Studies / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=case1164903681.

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27

Cini, Andrea. "Scribe marks at fuselage joints : initiation and propagation of fatigue cracks from mechanical defects in aluminium alloys." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7895.

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Mechanical damages, like scratches, are commonly detected on the surfaces of aircraft components and structures. They can be accidentally introduced during machining or maintenance operations or be the result of wear and impacts during aircraft service. Under the action of service loads, such mechanical damage can generate fatigue cracks reducing the component fatigue life and compromising the aircraft structural integrity. The evaluation of the effect of scratches and other small mechanical defects on the structure and component fatigue lives is therefore necessary to define an inspections pr

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28

Hamdi, Jabrane Khalil. "Modélisation explicite de l’initiation et la propagation de fractures." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0353/document.

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L’étude du comportement des roches nécessite de comprendre leur réponse sous diverses sollicitations. L’étude énergétique de l’endommagement des roches est indispensable pour prédire les phénomènes dynamiques. Ces phénomènes sont dus au développement de fissures dans les roches soumises à des fortes contraintes initiales et induites. La fissuration est une forme de dissipation d’énergie qui permet de rétablir l'équilibre du milieu. L’objectif de la thèse est de modéliser la fissuration dans les milieux rocheux dans la perspective d’étudier le comportement des ouvrages souterrains à grande prof

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29

Piques, Roland. "Mecanique et mecanismes de l'amorcage et de la propagation des fissures en viscoplasticite dans un acier inoxydable austenitique." Paris, ENMP, 1989. http://www.theses.fr/1989ENMP0128.

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Etude de l'amorcage et de la propagation d'une fissure macroscopique d'acier inoxydable ductible type 316l a 575**(o)c-650**(o)c en utilisant differentes eprouvettes de mecanique de la rupture et un large domaine de conditions d'essais. Proposition d'une approche locale de la fissuration en fluage

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30

Nizery, Erembert. "Amorçage et propagation des fissures de fatigue dans les alliages d'aluminium 2050-T8 et 7050-T7451." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0131/document.

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Les alliages d'aluminium utilisés dans les structures aéronautiques (fuselage, voilure) sont soumis à des chargements cycliques, faisant de la fatigue l'un des facteurs dimensionnant. Dans cette thèse, les mécanismes d'amorçage de ces fissures de fatigue – au niveau des particules intermétalliques – et de micropropagation sont étudiés expérimentalement et numériquement sur les alliages 2050-T8 et 7050-T7451. Les analyses des premiers chapitres portent sur la description des particules intermétalliques qui sont les plus susceptibles de donner lieu à une amorce de fissure dans la matrice d'alumi

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31

Kianzad, Siamak. "Measurement of Thermal Insulation properties of TBC inside the Combustion chamber." Thesis, Luleå tekniska universitet, Materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-61917.

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This master thesis project was performed in collaboration with Scania CV AB, Engine Materials group. The purpose with the project was to investigate different ceramic TBC (Thermal Barrier Coating) thermal insulation properties inside the combustion chamber. Experimental testing was performed with a Single-Cylinder engine with TBC deposited on selected components. A dummy-valve was developed and manufactured specifically for this test in order to enable a water cooling system and to ease the testing procedure. The dummy-valve consists of a headlock, socket, valve poppet and valve shaft. Additio

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32

Scharnweber, Michael. "Initiierung und Ausbreitung kurzer Ermüdungsrisse in ein- und zweiphasigem Edelstahl." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-143798.

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In der vorliegenden Arbeit wurden Untersuchungen zum Initiierungs- und Ausbreitungsverhalten kurzer Ermüdungsrisse in einem austenitischen sowie einem austenitisch-ferritischen Edelstahl durchgeführt. Dazu erfolgten zyklische Verformungsexperimente sowohl ex situ als auch in situ im Rasterelektronenmikroskop. Die Auswertung der Experimente erfolgte im Rasterelektronenmikroskop sowohl abbildend in verschiedenen Modi als auch über Rückstreuelektronenbeugungsmessungen. Bezüglich der Rissinitiierung wurde eine Häufigkeitsverteilung der Rissinitiierungsorte für beide Stähle erstellt. Die dabei ermi

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33

Gautrelet, Christophe. "Développement et exploitation d'un banc vibratoire en flexion pour les essais de fatigue Linearity investigation from a vibratory fatigue bench Fatigue curves of a low carbon steel obtained from vibration experiments with an electrodynamic shaker." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMIR21.

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Dans le but de fournir des données expérimentales pour alimenter les modèles numériques développés au Laboratoire de Mécanique de Normandie, nous avons mis en place un banc d'essais uniaxiaux en fatigue vibratoire permettant de tester des structures à grand nombre de cycles. Après la rédaction d’un cahier des charges pour définir les caractéristiques d’excitations et de mesures, une étude de qualification de ce moyen d’essais est présentée afin d’obtenir les plages de performance basée sur l’hypothèse de linéarité du système. Ensuite, pour vérifier la faisabilité en fatigue, nous avons réalisé

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Trottier, Cassandra. "Evaluation of Alkali-Silica Reaction (ASR)-Induced Damage Generation and Prolongation in Affected Recycle Concrete." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/41093.

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Recycled concrete is among the rising eco-friendly construction materials which helps to reduce waste and the need for new natural resources. However, such concrete may present previous deterioration due to, for instance, alkali-silica reaction (ASR), which is an ongoing distress mechanism that may keep being developed in the recycled material. This work aims to evaluate the potential of further distress and crack development (i.e. initiation and propagation) of AAR-affected RCA concrete in recycled mixtures displaying distinct past damage degrees and reactive aggregate types. Therefore, concr

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Ouarabi, Mohand Ouramdane. "Influence de la fréquence de chargement sur la résistance à l'amorçage et la croissance des fissures de fatigue dans des aciers utilisés dans des applications mécaniques exigeantes." Thesis, Paris 10, 2018. http://www.theses.fr/2018PA100034.

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Les essais de fatigue peuvent être effectués dans une gamme de fréquences similaire, mais les fréquences les plus élevés sont généralement préférables afin de réduire le temps de test et d'obtenir des résultats dans une période raisonnable. La question reste à savoir si un effet de fréquence existe. Cette étude traite de l'effet de la fréquence de chargement sur la résistance à l'amorçage et à la propagation des fissures sur 3 matériaux (M800HY, CP1000 et DP1180) utilisés dans le domaine automobile. Deux rapports de charge (R=-1 et 0.1) et cinq fréquences de chargement (25 Hz, 30 Hz, 150 Hz et

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36

Messager, Alexandre. "Étude de l'amorçage et de la propagation de fissures de fatigue internes courtes en régime gigacyclique dans un alliage d'aluminium de fonderie." Thesis, Paris, HESAM, 2020. http://www.theses.fr/2020HESAE032.

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Le procédé de fonderie permet de produire en grande série des pièces à géométrie complexe à faible coût. Cependant, les défauts inhérents à ce procédé de fabrication (soufflures, retassures, etc.) sont des sites privilégiés d’amorçage de fissures de fatigue. La position d'un défaut par rapport à la surface de la pièce influe sur sa nocivité et sur la résistance en fatigue du composant. Les connaissances actuelles sur les mécanismes d'amorçage et de propagation de fissures de fatigue internes sont bien moins développées que celles sur les fissures amorcées à partir de défauts de surface. L’obje

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Malpertu, Jean-Louis. "Fatigue mecano-thermique d'un superalliage a base de nickel." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0075.

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Etude sur une eprouvette tubulaire en alliage in100 soumise simultanement a un cycle de temperature (600 a 1050c) et a un cycle de deformation. Determination experimentale des lois de comportement anisotherme. Influence de divers parametres sur l'amorcage et le debut de propagation des fissures. Analyse des mecanismes d'endommagement lies a la fragilisation de l'alliage par la diffusion de l'oxygene. Proposition d'un modele d'endommagement prenant directement en compte l'interaction fatigue-oxydation. Prevision de la duree de vie en fatigue isotherme a 1000c et en fatigue mecano-thermique

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38

German, Roman. "Vliv zbytkových napětí na kontaktní porušování keramických laminátů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382550.

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The presence of the compressive or tensile thermal residual stresses in layers of a ceramic laminate induced due to different volume change of each layer´s material during the cooling from the sintering temperature can considerably affect resistivity of ceramics against contact damage. Within this work 2D parametric FEM models were created, in order to study the effect of the surface layer thickness, residual stress values and indenting body dimension on the initiation and propagation of the cone crack in the surface layer of the laminate. For the analysis of the critical conditions for the cr

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Bassaw, Benjamin. "Comportement en fatigue d'un alliage expérimental Cu-Al(2)O(3) : (base cuivre à dispersion d'alumine) élaboré par métallurgie des poudres." Poitiers, 1988. http://www.theses.fr/1988POIT2263.

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Des essais de traction-compression dans le domaine de fatigue plastique ont revele la grande stabilite cyclique du materiau. Analyse des conditions d'amorcage et de propagation des fissures. Mise en evidence du role des defauts de frittage ou des inclusions. Des essais de fissuration sont effectues dans le domaine des moyennes et basses vitesses en considerant l'effet du rapport de charge et de l'environnement. Description par la mecanique lineaire de rupture du comportement des microfissures

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40

Nakamura, Takatoshi. "Fatigue crack initiation in weldments." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/38349.

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Thesis (Ocean. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1994, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.<br>Includes bibliographical references (leaves 160-162).<br>by Takatoshi Nakamura.<br>M.S.<br>Ocean.E.

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41

DOQUET-DARIDON, VERONIQUE. "Comportement et endommagement de deux aciers a structure cubique centree et cubique a faces centrees, en fatigue oligocyclique, sous chargement multiaxial non-proportionnel." Paris, ENMP, 1989. http://www.theses.fr/1989ENMP0137.

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Precision des mecanismes de durcissement cyclique anormal manifeste par certains materiaux sous chargement non proportionnel, ainsi que des reductions d'endurance qui l'accompagnent. Etude dans le cas de l'acier inoxydable austenitique 316 l et d'un acier doux

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42

Hodgkins, Andrew D. "Crack propagation in nuclear graphite." Thesis, University of Manchester, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488486.

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43

Dumpleton, P. "Fatigue crack propagation in polyethylene." Thesis, Cranfield University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373987.

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Dzugan, Jan. "Crack initiation determination for Charpy size specimens." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-29268.

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An investigation in the field of the crack initiation determination for Charpy size specimens was carried out. An extensive literature survey of published methods for the crack initiation was performed. Methods based on the stretch zone width measurement, blunting line, multiple gauge measurement, electric potential drop, compliance changing rate, acoustic emission, ultrasonic method and magnetic emission are discussed in the theoretical part of the report. Analytical methods for the critical J-integral evaluation were also taken into account, as well as the expressions for the J-integral calc

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Dzugan, Jan. "Crack initiation determination for Charpy size specimens." Forschungszentrum Rossendorf, 2003. https://hzdr.qucosa.de/id/qucosa%3A21753.

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An investigation in the field of the crack initiation determination for Charpy size specimens was carried out. An extensive literature survey of published methods for the crack initiation was performed. Methods based on the stretch zone width measurement, blunting line, multiple gauge measurement, electric potential drop, compliance changing rate, acoustic emission, ultrasonic method and magnetic emission are discussed in the theoretical part of the report. Analytical methods for the critical J-integral evaluation were also taken into account, as well as the expressions for the J-integral calc

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46

Fuleki, Daniel M. Carleton University Dissertation Engineering Mechanical and Aerospace. "Crack initiation and short crack growth characteristics of notched merl 76 specimens." Ottawa, 1995.

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47

Santos, e. Lucato Sergio Luis dos. "Constraint induced crack initiation and crack growth at electrode edges in piezoelectric ceramics." Phd thesis, [S.l.] : [s.n.], 2002. http://elib.tu-darmstadt.de/diss/000191.

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Beever, P. F. "Initiation and propagation of smouldering reactions." Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374171.

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Rossi, Adriano Giorgio. "Initiation, propagation and resolution of inflammation." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/24284.

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In order to gain a better understanding of the mechanisms controlling inflammatory processes with a view to developing novel therapies for inflammatory disease, the research presented in this thesis has been focused on unravelling the molecular complexities associated with the initiation, propagation and resolution of inflammation. Although neutrophilic and eosinophilic granulocytes are key effector cells in orchestrating host defence against invading bacteria and parasites, their over-recruitment, uncontrolled activation and defective removal by macrophages play a prominent role in generating

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Coates, Matthew. "Crack initiation and the fracture of ferritic steels." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410320.

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