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Thèses sur le sujet « Fracture parameter »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

MacLennan, Iain James. "Two parameter engineering fracture mechanics." Thesis, University of Glasgow, 1996. http://theses.gla.ac.uk/6756/.

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The object of this work was to investigate and expand on previously carried out research into elastic-plastic crack tip fields using the first two terms of the Williams expansion to characterise the degree of crack tip constraint. As a precursor to this research a history of fracture mechanics is also presented. In the present work crack tip fields in small scale yielding have been detennined using modified boundary layer formulations in an attempt to model the influence of the second order term of the Williams expansion, the T -stress. The prime object of this thesis was to investigate and ex

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2

Yoon, Kee Bong. "Characterization of creep fatigue crack growth behavior using C[superscript](t[superscript]) parameter." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/17523.

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3

Curtin, William J. "An investigation of a two parameter elastic-plastic fracture mechanics methodology." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/17782.

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4

Reakes, Clayton E. IV. "Nonlinear Fracture Mechanics Analysis of Threaded Fastener Geometry." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1447425945.

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5

Wert, Melissa Jane. "The applicability of modified J-integral as a fracture parameter for polycarbonate." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/18860.

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6

MARTINELLI, MATTIA. "From outcrop to fracture model. A multidisciplinary approach to characterize fracture networks from outcrop analogues in carbonates affected by extensional tectonics." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2020. http://hdl.handle.net/10281/271026.

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I network di fratture hanno un ruolo fondamentale nel controllo della permeabilità e del flusso dei geo-fluidi (e.g. idrocarburi, acqua, fluidi idrotermali ecc.). Nel sottosuolo i parametri delle fratture vengono solitamente caratterizzati utilizzando dati di pozzo e dati sismici, i quali però sono divisi da un salto di scala. Infatti, i dati di pozzo sono sparsi e parziali mentre anche la sismica migliore non è in grado di identificare fratture con dimensione minori di 200 metri. Gli analoghi esumati con dimensioni chilometriche posso aiutare a colmare questo divario permettendo di raccoglier

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7

Wang, Yongyi. "A two-parameter characterization of elastic-plastic crack tip fields and applications to cleavage fracture." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13461.

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8

Hosseinian, Armin. "Numerical simulations of fluid flow through a single rough walled fracture." Thesis, Curtin University, 2011. http://hdl.handle.net/20.500.11937/1764.

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The morphological properties of rock fractures may have a significant influence on their hydromechanical behaviour. Fracture surface roughness could change the fluid flow regime from laminar to turbulent, while it causes the flow properties to deviate from cubic law for smooth channels due to a change in fracture equivalent hydraulic aperture. Different empirical (including the well known Joint Roughness Coefficient, JRC) and statistical methods have been proposed for surface roughness characterisation in an attempt to link them to the hydromechanical behaviour of fractures.This thesis aims to

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9

WATANABE, Katsuhiko, and Hideyuki AZEGAMI. "Proposal of a New Crack Model Considering the Discontinuity in the Cracked Plane and Its Application to the Evaluation of Crack Parameter." 日本機械学会, 1986. http://hdl.handle.net/2237/12161.

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10

渡辺, 勝彦, Katsuhiko Watanabe, 秀幸畔上 та Hideyuki Azegami. "き裂前縁を含む面の非連続性を考慮したき裂モデルの提案とそのき裂パラメータ評価への適用". 日本機械学会, 1985. http://hdl.handle.net/2237/7227.

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11

Shukla, Pratik P. "Viability and characterization of the laser surface treatment of engineering ceramics." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8426.

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Laser surface treatment of engineering ceramics offers various advantages in comparison with conventional processing techniques and much research has been conducted to develop applications. Even so, there still remains a considerable gap in knowledge that needs to be filled to establish the process. By employing a fibre laser for the first time to process silicon nitride (Si3N4) and zirconia (ZrO2) engineering ceramics, a comparison with the CO2 and a Nd:YAG lasers was conducted to provide fundamental understanding of various aspects of the laser beam-material interaction. Changes in the morph

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12

Rasche, Stefan. "Bestimmung von Materialparametern der elastisch-plastischen Verformung und des spröden Versagens aus Small-Punch-Kleinstproben." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2013. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-116905.

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Der Small-Punch-Test (SPT) ist eine vielversprechende minimalinvasive mechanische Prüfmethode, wenn nur sehr wenig Material für Proben zur Verfügung steht. Die vorliegende Arbeit hat das Ziel, aus Small-Punch-Kleinstproben wahre Materialparameter der elastisch-plastischen Verformung und des spröden Versagens zu bestimmen. Die Kraft-Verschiebungs-Kurve des Versuchs stellt die nichtlineare Materialantwort der inhomogen beanspruchten Probe dar. Das inverse Problem der Identifikation konstitutiver Materialparameter wird numerisch mit Hilfe von Finite-Elemente-Simulationen in Verbindung mit einem R

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13

Smith, Daniel J. "Rapid determination of temperature-dependent parameters for the crystal viscoplasticity model." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43670.

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Thermomechanical fatigue life prediction is important in the design of Ni-base superalloy components in gas turbine engines and requires a stress-strain analysis for accurate results. Crystal viscoplasticity models are an ideal tool for this stress-strain analysis of Ni-base superalloys as they can capture not only the anomalous yielding behavior, but also the non-Schmid effect, the strain rate dependence, and the temperature dependence of typically large grained directionally-solidified and single crystal alloys. However, the model is difficult to calibrate even for isothermal conditions beca

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14

Hao, Bin. "Use of fracture mechanics parameters to characterize comminution." Master's thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-02162010-020306/.

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15

Kraus, Michael A. [Verfasser], Geralt [Akademischer Betreuer] [Gutachter] Siebert, Jens [Gutachter] Schneider, and Gerhard [Gutachter] Müller. "Machine Learning Techniques for the Material Parameter Identification of Laminated Glass in the Intact and Post-Fracture State / Michael A. Kraus ; Gutachter: Geralt Siebert, Jens Schneider, Gerhard Müller ; Akademischer Betreuer: Geralt Siebert ; Universität der Bundeswehr München, Fakultät für Bauingenieurwesen und Umweltwissenschaften." Neubiberg : Universitätsbibliothek der Universität der Bundeswehr München, 2019. http://d-nb.info/1183739559/34.

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Kraus, Michael A. Verfasser], Geralt [Akademischer Betreuer] [Gutachter] [Siebert, Jens [Gutachter] Schneider, and Gerhard [Gutachter] Müller. "Machine Learning Techniques for the Material Parameter Identification of Laminated Glass in the Intact and Post-Fracture State / Michael A. Kraus ; Gutachter: Geralt Siebert, Jens Schneider, Gerhard Müller ; Akademischer Betreuer: Geralt Siebert ; Universität der Bundeswehr München, Fakultät für Bauingenieurwesen und Umweltwissenschaften." Neubiberg : Universitätsbibliothek der Universität der Bundeswehr München, 2019. http://d-nb.info/1183739559/34.

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17

Que, Norbert S. Civil &amp Environmental Engineering Faculty of Engineering UNSW. "Identification of cohesive crack fracture parameters using mathematical programming." Awarded by:University of New South Wales. School of Civil and Environmental Engineering, 2003. http://handle.unsw.edu.au/1959.4/19189.

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This thesis is concerned with the characterisation of the parameters governing the tension-softening relations of the cohesive crack model. Parameter identification is an important area in fracture mechanics as it enables the use of a fracture model for the simulation of fracture processes in structures. Research, however, has shown that such a task is not trivial and continues to pose challenging problems to experimentalists and analysts alike. This dissertation presents general and efficient indirect methods for the characterisation of mode I fracture parameters defining the cohesive crack m

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18

LIN, CHUNG-YI. "Determination of the Fracture Parameters in a StiffenedComposite Panel." NCSU, 2000. http://www.lib.ncsu.edu/theses/available/etd-20001122-103139.

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<p>A modified J-integral, namely the equivalent domain integral, is derived for athree-dimensional anisotropic cracked solid to evaluate the stress intensity factor alongthe crack front using the finite element method. Based on the equivalent domain integralmethod with auxiliary fields, an interaction integral is also derived to extract the secondfracture parameter, the T-stress, from the finite element results. The auxiliary fields arethe two-dimensional plane strain solutions of monoclinic materials with the plane ofsymmetry at x3=0 under point loads applied at the crack tip. These solutions

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19

Yang, Lin. "Fracture mechanics parameters for cracks on non-planar interfaces." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/17659.

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20

CALAND, VERONICA DE SOUZA. "EXPERIMENTAL RESULTS OF FRACTURE PARAMETERS FOR HIGH PERFORMANCE CONCRETE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2001. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1995@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>A utilização mais freqüente dos concretos de alto desempenho na Construção Civil exige um melhor conhecimento sobre o comportamento deste material e a verificação de possíveis modificações no dimensionamento de elementos estruturais, como a consideração do efeito de escala. Recentemente, os conceitos da teoria da mecânica da fratura para a análise do comportamento das estruturas começaram a ser utilizados. A energia de fraturamento passa a ser uma propriedade intrínseca do material, fundamental no controle da resistência à f

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21

Ekman, Matthew J. "Automated photoelastic determination of fracture parameters for bimaterial interface cracks." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/10421.

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This thesis details an experimental study on the determination of the fracture parameters for a crack located at the interface between two dissimilar materials using the method of photoelasticity. The interface is potential1y an inherent weak spot of any composite material, structure"or adhesively bonded joint. Accurate description of the state of stress at the crack tip is required for strength prediction. The concept of the complex stress intensity factor is used to characterise the elastic crack tip stress field for an interface crack. Complex stress intensity factors and their moduli have

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22

Hrstka, Miroslav. "Evaluation of Fracture Mechanical Parameters for Bi-Piezo-Material Notch." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399212.

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Předkládaná dizertační práce se zabývá stanovením hlavních členů Williamsova asymptotického rozvoje popisujícího rovinné elektro-elastické pole v okolí piezoelektrických bi-materiálových vrubů a trhlin na rozhraní za použití rozšířeného Lechnického-Eshelbyho-Strohova formalismu v návaznosti na čistě anizotropní pružnost. Je ukázáno, že rozšířený Lechnického-Eshelbyho-Strohův formalismus představuje spolu s moderními programovacími koncepty v jazyku Python efektivní a také praktický nástroj pro lomovou analýzu piezoelektrických bi-materiálů. Teoretická část práce popisuje aspekty anizotropní pr

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23

Macdonald, Vincent. "Détermination d’un critère de rupture des gaines de Zircaloy-4 détendu hydruré contenant un blister d’hydrures, en conditions d’accident d’injection de réactivité." Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM038/document.

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Cette étude porte sur la détermination d’un critère de rupture des gaines de combustible de Zircaloy-4 détendu hydruré contenant un blister d’hydrures, en conditions accidentelles représentatives d’un accident d’injection de réactivité. Deux plages de comportement différentes en fonction de la température ont clairement été mises en évidence grâce à l’étude bibliographique, aux différentes campagnes d’essais mécaniques et aux analyses des faciès de rupture des éprouvettes rompues : une rupture de type fragile pour la gaine à 25°C et une rupture ductile à 350°C.A 25°C, la rupture fragile a été

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24

Sajjadian, Valiahmad. "Gravity drainage : microscopic studies and free fall in fractured reservoirs." Thesis, Heriot-Watt University, 1999. http://hdl.handle.net/10399/595.

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25

Healy, David. "Fracture prediction and the inversion of fault parameters using elastic dislocation theory." Thesis, University of Liverpool, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402306.

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26

Koutsolelos, Evangelos. "Numerical analysis of a shear ram and experimental determination of fracture parameters." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74982.

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Thesis (Nav. E. and S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 127-129).<br>The human, economic and environmental disaster that followed the Deepwater Horizon catastrophe at the Gulf of Mexico in April 2010 revealed how much the offshore drilling industry relies on the Blowout Preventer (BOP) as the primary means of controlling a 'well kick' or 'blowout'. One of the most important components of the BOP are the shear rams which are tasked with cutting the drilling string

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27

Deng, Hailin. "Upscaling reactive transport parameters for porous and fractured porous media." Tallahassee, Florida : Florida State University, 2009. http://etd.lib.fsu.edu/theses/available/etd-10292009-103844/.

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Thesis (Ph. D.)--Florida State University, 2009.<br>Advisor: Ming Ye, Zhenxue Dai, Florida State University, College of Arts and Sciences, Dept. of Geological Sciences. Title and description from dissertation home page (viewed on Apr. 26, 2010). Document formatted into pages; contains xxii, 167 pages. Includes bibliographical references.

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28

Bejček, Michal. "Vyhodnocení lomově-mechanických parametrů betonu po vystavení vysokým teplotám." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-371838.

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The diploma thesis is focused on the evaluation of mechanical fracture parameters of concrete after exposure to high temperatures. In the introductory theoretical part general principles of fracture mechanics with the concentration on a linear elastic fracture mechanics and non-linear fracture models for the concrete are summarized. The meaning of the three-point bending fracture test used for determination of fracture parameters is also explained. Further the influence of high temperatures on the partial components of concrete and general modeling of temperature loading is described. The prac

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Baietti, Giulia <1991&gt. "Mode-I fracture parameters of quasi-brittle materials: direct evaluation using DIC and relationship with Mode-II interfacial parameters." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amsdottorato.unibo.it/9788/1/baietti_giulia_tesi.pdf.

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The objective of this thesis is the investigation of the Mode-I fracture mechanics parameters of quasi-brittle materials to shed light onto the influence of the width and size of the specimen on the fracture response of notched beams. To further the knowledge on the fracture process, 3D digital image correlation (DIC) was employed. A new method is proposed to determine experimentally the critical value of the crack opening, which is then used to determine the size of the fracture process zone (FPZ). In addition, the Mode-I fracture mechanics parameters are compared with the Mode-II interfacial

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Dubravec, Kristián. "Elastoplastická analýza napětí a deformace a stanovení lomových parametrů při tahovém namáhání těles s koncentrátory napětí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443729.

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The aim of this thesis is the construction of a diagram of fracture strain for high strength steel OCHN3MFA and its application for the estimation of fracture toughness of this material. The first part of the thesis contains the necessary theoretical framework for numerical modelling of tensile tests of various specimens - smooth specimen, specimen with a notch and specimen with a circumferential crack, it describes the influence of triaxiality on the fracture of bodies and the possibilities of construction of the diagram of fracture strain. Subsequently, a numerical model of these specimens i

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Michniak, Radomír. "Možnosti využití rozptýlené výztuže pro konstrukční betony." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226092.

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The master's thesis is focused on polypropylene fibres, their properties, availability, pitfalls associated with the use in practice. In the experimental part are the results of testing specimens with dispersed reinforcement fibers in varying proportions and their comparison.

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Nadri, Dariush. "Joint non-linear inversion of amplitudes and travel times in a vertical transversely isotropic medium using compressional and converted shear waves." Thesis, Curtin University, 2008. http://hdl.handle.net/20.500.11937/1810.

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Massive shales and fractures are the main cause of seismic anisotropy in the upper-most part of the crust, caused either by sedimentary or tectonic processes. Neglecting the effect of seismic anisotropy in seismic processing algorithms may incorrectly image the seismic reflectors. This will also influence the quantitative amplitude analysis such as the acoustic or elastic impedance inversion and amplitude versus offsets analysis. Therefore it is important to obtain anisotropy parameters from seismic data. Conventional layer stripping inversion schemes and reflector based reflectivity inversion

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Yi, Jangho. "Effect of Microstructural Parameters on Mechanical Properties and Fracture in α+β Titanium Alloy". Doctoral thesis, Kyoto University, 2019. http://hdl.handle.net/2433/244547.

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京都大学<br>0048<br>新制・課程博士<br>博士(工学)<br>甲第22066号<br>工博第4647号<br>新制||工||1725(附属図書館)<br>京都大学大学院工学研究科材料工学専攻<br>(主査)教授辻伸泰, 教授安田秀幸, 教授宇田哲也<br>学位規則第4条第1項該当<br>Doctor of Philosophy (Engineering)<br>Kyoto University<br>DFAM

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34

Botros, Farag Elia Farag. "On upscaling groundwater flow and transport parameters in porous and fractured media." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3275828.

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Young, Catherine Mary. "Do In-Line Dance, Progressively Loaded Squats and Foot Stomping Affect the Parameters of Fracture Risk in Postmenopausal Women?" Thesis, Griffith University, 2007. http://hdl.handle.net/10072/366122.

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Introduction: The incidence of hip fracture is increasing and the associated costs to individuals and the community needs to be vigorously addressed. This study was a randomized controlled intervention designed to examine the effects of a simple-to-do, easy-to-implement exercise programme on the elements of hip fracture risk which are known to be amenable to exercise therapy. Methods: Forty-five volunteers were randomly assigned to one of three groups. All groups attended one line dance class per week. Two groups additionally performed progressively loaded squats five times a week. One group

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Anjos, Ana Alexandra da Cunha Pereira. "" Objective Assessment of Acupuncture Effects By Microcirculation-Related Parameters in Patients With Proximal Femur Fracture "." Master's thesis, Instituto de Ciências Biomédicas Abel Salazar, 2011. http://hdl.handle.net/10216/57085.

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Anjos, Ana Alexandra da Cunha Pereira. "" Objective Assessment of Acupuncture Effects By Microcirculation-Related Parameters in Patients With Proximal Femur Fracture "." Dissertação, Instituto de Ciências Biomédicas Abel Salazar, 2011. http://hdl.handle.net/10216/57085.

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Aksu, Engin. "The Effect Of Austempering Parameters On Impact And Fracture Toughness Of Din 35nicrmov12.5 Gun Barrel Steel." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606240/index.pdf.

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In this study the effects of different austempering times and temperatures on impact toughness, hardness and fracture toughness properties of 35NiCrMoV12.5 gun barrel steel are investigated. 300 &deg<br>C, 325 &deg<br>C and 350 &deg<br>C were chosen as austempering temperatures. Isothermal holding times at these temperatures were chosen as 1 minute, 10 minutes, 1 hour and 10 hours. It was found that, 350 &deg<br>C being an exception, austempering temperature and impact toughness has an inverse relationship and impact toughness increases as isothermal holding time increases. However this behavi

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Freeman, P. N. "A study of parameters influencing fracture development in longwall coalfaces with particular reference to powered support." Thesis, Cardiff University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329635.

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40

AZEVEDO, CECILIA TOLEDO DE. "FRACTURE PARAMETERS ESTIMATION THROUGH THE ANALYSIS OF THE PRESSURE CURVE DURING FRACTURING OF HIGH PERMEABILITY FORMATION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34622@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>Valkó e Oligney propuseram um modelo que estima a evolução da fratura utilizando uma interpretação direta da curva de pressão de fundo medida durante uma operação de fracpack. Os únicos dados de entrada necessários para a aplicação do modelo são os registros geralmente disponíveis durante e após a operação. Considerando uma fratura de geometria radial e utilizando equações simples de fluxo e de geomecânica, o modelo obtém raios de empacotamen

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Kay, Norman R. "A combined experimental and analytical approach for interface fracture parameters between dissimilar materials in electronic packages." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/289886.

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Failure of materials and interfaces are commonly linked to the fracture parameters such as the stress intensity factors and the energy release rate. However, there exists no experimental procedure for the direct measurement of these fracture parameters. This dissertation reports on the development of a new technique to obtain these parameters by testing specimens created from post-production electronic packages. The results from the experimental testing are then used as the input for an analytical model which computes the desired parameters. The specimens are thin strips of post production ele

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42

Nadri, Dariush. "Joint non-linear inversion of amplitudes and travel times in a vertical transversely isotropic medium using compressional and converted shear waves." Curtin University of Technology, Department of Exploration Geophysics, 2008. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=17631.

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Massive shales and fractures are the main cause of seismic anisotropy in the upper-most part of the crust, caused either by sedimentary or tectonic processes. Neglecting the effect of seismic anisotropy in seismic processing algorithms may incorrectly image the seismic reflectors. This will also influence the quantitative amplitude analysis such as the acoustic or elastic impedance inversion and amplitude versus offsets analysis. Therefore it is important to obtain anisotropy parameters from seismic data. Conventional layer stripping inversion schemes and reflector based reflectivity inversion

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Milenko, Perović. "Uticaj parametara zavarivanja trenjem - miješanjem na otpornost prema lomu suočenog spoja legure aluminijuma visoke čvrstoće." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2018. https://www.cris.uns.ac.rs/record.jsf?recordId=107429&source=NDLTD&language=en.

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U disertaciji je predstavljen postupak spajanja topljenjem nezavarljive legure aluminijuma EW AN 7049A u stanju T 652 postupkom zavarivanja trenjem -miješanjem. Korišćenjem pet različitih tipova alata za zavarivanje, varijacijom brzine zavarivanja i broja obrtaja, zavareni spoj dostiže efikasnost od 70% do 80 % zatezne čvrstoće osnovnog materijala. Karakterizacija zavarenog spoja izvedena je standardnim metodama za eksperimentalno određivanje energije udara i udarne žilavosti na Charpy epruvetama, a ispitivanja mehanike loma zavarenih spojeva savijanjem u tri tačke SENB epruveta (ASTM E 1820),

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Taskonak, Burak. "The effects of residual stress, viscoelastic and thermodynamic parameters on apparent fracture toughness of dental bilayer ceramic composites." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0006425.

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Guo, Xiaofei [Verfasser]. "Influences of Microstructure, Alloying Elements and Forming Parameters on Delayed Fracture in TRIP/TWIP-Aided Austenitic Steels / Xiaofei Guo." Aachen : Shaker, 2012. http://d-nb.info/1066197296/34.

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Melin, Hanna. "Controlling parameters for normal and shear behaviour of rock fractures-a study of direct shear test data from SKB." Thesis, KTH, Jord- och bergmekanik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93976.

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The deep mining and civil engineering industry need to perform rock stability analyses during excavation projects. The stability is mainly controlled by the shear strength of the rock fractures, which are the weakest point of the rock mass. In turn, the shear strength is governed by the mechanical properties of the fractures. It is both time and cost demanding to determine the properties of the rock fractures in laboratory. Also, the interpretation of the results requires a deep understanding of the normal and shear behaviour of rock fractures. This study aims to investigate if it is possible

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Holušová, Táňa. "Analýza napjatosti a porušení ve zkušebních tělesech používaných pro určování lomově-mechanických parametrů kvazikřehkých materiálů." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225575.

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The thesis is focused on a test on determination of the fracture-mechanical parameters of quasi-brittle materials, especially concrete. What is referred to as the wedge-splitting test is considered, for which a variety of shapes of notched specimen can be used. This work is exclusively focused on the cylinder-shaped specimen of diameter 150 mm and breadth of 100 mm. The test is performed virtually using Atena 2D FEM software. Progress of failure is observed during loading of the specimen for various notch lengths. The amount of energy released for the development the failure outside of the tes

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Benmabrouk, Sélia. "Ιnvestigation of the influence of the process parameters on the microstructure and fracture behavior of a Ni20wt.%Cr alloy produced by Laser Powder Bed Fusion". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMIR22.

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Le comportement à rupture d’alliages base-nickel conventionnels (coulés, forgés…) est depuis longtemps étudié dans le cadre du dimensionnement des structures. Cependant, les microstructures complexes issues des procédés de fabrication additive métallique induisent des comportement mécaniques différents, compliquant la transposition des savoir-faire. Afin de contribuer à mieux comprendre les mécanismes de rupture issus de ces procédés, ces travaux de thèse s’intéressent au comportement à rupture de l’alliage Ni20wt.%Cr produit par Fusion Laser sur Lit de Poudre. L’influence de trois paramètres

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Lombard, Hannalie. "Optimized fatigue and fracture performance of friction stir welded aluminium plate : a study of the inter-relationship between process parameters, TMAZ, microstructure, defect population and performance." Thesis, University of Plymouth, 2007. http://hdl.handle.net/10026.1/2389.

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Friction stir welding (FSW) is an exciting new solid-state welding process with the potential to advantageously impact many fabrication industries. Current take-up of the process by industry is hindered by lack of knowledge of suitable welding parameters for any particular alloy and sheet thickness. The FSW process parameters are usually chosen empirically and their success is evaluated via simple mechanical property testing. There are severe drawbacks with such methods of determining manufacturing conditions. These include indirect relationships between tensile and fatigue properties, particu

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LE, GIA VINH. "Extraction de parametres de texture d'images de croissance cristalline dendritique." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10181.

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La croissance cristalline de cucl#2, 2h#2o par evaporation en presence d'impuretes de type biologique donne naissance a une structure dendritique quasi-bidimensionnelle dont l'image est caracteristique des impuretes introduites. Cette methode est appliquee dans les domaines du vivant (agro-alimentaire et sante) sous le nom de thesigraphie. L'etude a pour objectif, apres un bilan de l'etat de l'art de methodes d'analyse visuelle, de definir une methodologie de caracterisation de ces images par les techniques de traitement d'image et de classification. Apres un recensement des caracteristiques v

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