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Tesi sul tema "Fracture mechanics"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Srivastava, Ankit. "Mechanics and Mechanisms of Creep and Ductile Fracture." Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc283799/.

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The main aim of this dissertation is to relate measurable and hopefully controllable features of a material's microstructure to its observed failure modes to provide a basis for designing better materials. The understanding of creep in materials used at high temperatures is of prime engineering importance. Single crystal Ni-based superalloys used in turbine aerofoils of jet engines are exposed to long dwell times at very high temperatures. In contrast to current theories, creep tests on Ni-based superalloy specimens have shown size dependent creep response termed as the thickness debit effect.

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2

Mansfield-Williams, H. D. "Mode 11 fracture mechanics in solid wood and fracture mechanics in laminated veneer lumber." Thesis, Brunel University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390815.

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3

Tiernan, Declan Martin. "Collocation studies in fracture mechanics and quantum mechanics." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318739.

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4

Denning, Shawn Patrick. "Fracture mechanics of sandwich structures." Thesis, Wichita State University, 2013. http://hdl.handle.net/10057/6809.

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Abstract (sommario):

Over the past few decades both the demand for knowledge as well an increase in the application of composite materials has boomed. This has led to an intensive focus by the research community to gather information and validate the use of such materials. Sandwich composites have been a particular interest and an intense demand for further understanding was sparked by the catastrophic rudder failure of Air Transat 961. This thesis focuses on understanding fracture mechanics and damage tolerance within sandwich composites. Facesheet disbond has severe impacts on the material systems strength and s

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5

Matthews, C. "Fracture mechanics of volcanic eruptions." Thesis, University College London (University of London), 2009. http://discovery.ucl.ac.uk/16280/.

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Abstract (sommario):

Seismology is a key tool in the forecasting of volcanic eruptions. The onset of an eruption is often preceded and accompanied by an increase in local seismic activity, driven by fracturing within the edifice. For closed systems, with a repose interval of the order of a century or more, this fracturing must occur in order to create a pathway for the magma to reach the surface. Time-to-failure forecasting models have been shown to be consistent with seismic acceleration patterns prior to eruptions at volcanoes in subduction zone settings. The aim of this research is to investigate the patterns i

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6

Richardson, James Bruce. "The mechanics of fracture healing." Thesis, University of Aberdeen, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290866.

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Abstract (sommario):

The mechanics applied to healing fractures vary widely. At one extreme rigid internal fixation is advocated, while at the other early mobilisation is recommended using external splints. Kuhn's method of paradigm orientated research was used to define the historical context of current assumptions regarding fracture healing. Conflict between the various schools of thought is the main evidence for failure of these assumptions and the need to evolve a new perspective on fracture healing. A paradigm is presented which proposes healing by external callus as an early stage and 'primary healing' as th

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7

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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8

Jonsson, Anders. "Integral equation methods for fracture mechanics and micro-mechanical problems." Doctoral thesis, KTH, Solid Mechanics, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3336.

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9

Stehn, Lars. "Tensile fracture of ice : test methods and fracture mechanics analysis." Doctoral thesis, Luleå tekniska universitet, Byggkonstruktion och -produktion, 1993. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18394.

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This thesis is concerned with several aspects of fracture of both brackish (low salinity) sea ice and freshwater ice. The tests and analyses are confined to tensile, or in fracture mechanics language, Mode I, fracture. A large part of this thesis is dedicated to demonstrate that Linear Elastic Fracture Mechanics (LEFM) can be applicable on ice by laboratory and in-situ tests of defined specimens. All interpretations are made using the dicipline of LEFM.First, the development of a field test equipment called FIFT ( a Field Instrument for Fracture toughness Tests on ice) is described. The FIFT i

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10

Liu, Guoning. "Application of fracture mechanics in electrical/mechanical failures of dielectrics /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?MECH%202006%20LIU.

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11

Vasic, Svetlana. "Applications of fracture mechanics to wood." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0030/NQ65471.pdf.

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12

Ohlsson, Ulf. "Fracture mechanics analysis of concrete structures /." Luleå, 1995. http://epubl.luth.se/avslutade/0348-8373/179/index.html.

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13

Pollitz, Ernest Theodore. "Studies on elastic-plastic fracture mechanics." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/18363.

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14

Carling, Michael John. "Fracture mechanics of short fibre composites." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/46986.

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15

Quintana, Alonso Ignacio. "Fracture mechanics of brittle lattice materials." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611458.

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16

Karstensen, Annette Degn. "Constraint estimation schemes in fracture mechanics." Thesis, University of Glasgow, 1996. http://theses.gla.ac.uk/7228/.

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Abstract (sommario):

Elastic-plastic crack tip constraint has been estimated for the common planar crack geometries. These include single edge cracked bars in tension and bending, centre cracked panels, and double edge cracked bars. The description of the stress field has been modified from a one parameter characterisation, based on K or J, to include a second term. The second parameter is a non-singular term, described either in terms of an elastic T-stress or a Q field. The limits of one and two parameter characterisation are discussed for single edge bars in tension and bending and for centre cracked panels. Fo

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17

Zhang, Guihua. "Development of numerical approaches to predict ductile and cleavage fracture of structural materials." Akron, OH : University of Akron, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1196174104.

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Dissertation (Ph. D.)--University of Akron, Dept. of Mechanical Engineering, 2007.<br>"December, 2007." Title from electronic dissertation title page (viewed 03/27/2008) Advisor, Xiaosheng Gao; Committee members, T.S. Srivatsan, Fred Choy, Wieslaw Binienda, Kevin Kreider; Department Chair, Celal Batur; Dean of the College, George K. Haritos; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.

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18

Kasturi, Krishna Kumar. "Microcracking Fracture Toughness for Graphite Epoxy Composite Laminates Using Finite Fracture Mechanics." ScholarWorks@UNO, 2006. http://scholarworks.uno.edu/td/427.

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Abstract (sommario):

Graphite/epoxy composite laminates are widely used in the aerospace industry. However the industry cannot take full advantage of the superior strength and stiffness of composite materials until their failure mechanisms can be thoroughly understood by engineers. Recognizing the importance of such understanding, the current study was undertaken to determine the microcracking fracture toughness in composite laminates using the energy release rate criteria. Three materials of specific interest in the aerospace industry – IM7/977-2, IM7/5555 and IM7/5276-1 – were analyzed. To evaluate the microcrac

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19

Averett, Rodney Dewayne. "Fracture Mechanics of High Performance Nylon Fibers." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5238.

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Abstract (sommario):

A fracture mechanics protocol appropriate for small fibers (35 micron diameter) is presented, which allows for the determination of the strength limitations of high performance nylon 6,6 fibers. Specifically, linear elastic fracture mechanics (LEFM) techniques are employed in addition to elastic-plastic fracture mechanics (EPFM) theories to achieve this. We assume that a minute semi-elliptical flaw of an unknown size exists in the specimen, as a result of the detrimental effects of the manufacturing process (melt spinning). Next, we seek to propagate this flaw in a stable manner throu

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20

Walker, Peter David. "“CAD-on” interfaces - a fracture mechanics characterization." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62663.

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Abstract Objective: “CAD-on” crowns, consisting of CAD/CAM milled lithium disilicate (LS2) veneers glass-fused to CAD/CAM milled yttrium oxide stabilized tetragonal zirconia polycrystal (Y-TZP) framework, have shown promise in increasing veneer fracture resistance. The glass fusion technique is purported to result in stronger bonding between veneer and framework when compared to conventional veneering. The objective of this study was to apply fracture mechanics methodology to characterize the interfaces present in “CAD-on” crowns. Methods: The notchless triangular prism (NTP) specimen f

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21

Abdussalam, Saleh R. "Damage and fracture mechanics of composite materials." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0005/NQ41601.pdf.

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22

Du, Jiaji. "A fracture mechanics study of concrete failure /." Thesis, Connect to this title online; UW restricted, 1988. http://hdl.handle.net/1773/7060.

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23

Sticko, Simon. "Smooth Particle Hydrodynamics Applied to Fracture Mechanics." Thesis, Uppsala universitet, Tillämpad mekanik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-202881.

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Abstract (sommario):

A numerical method commonly referred to as smooth particle hydrodynamics (SPH) is implemented in two dimensions for solid mechanics in general and fracture mechanics in particular. The implementation is tested against a few analytical cases: a vibrating plate, a bending plate, a modus I crack and a modus II crack. A conclusion of these tests is that a better way of treating a shortcoming of SPH called tensile instability is needed. A study is made on the best choice of a vital parameter called the smoothing radius, and it is found that a good choice of the smoothing radius is roughly 1.5 times

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24

Sun, Gexin. "Application of fracture mechanics to mine design." Thesis, University of Nottingham, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.480734.

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25

Banerjee, Anuradha. "The fracture mechanics of bi-material systems." Thesis, University of Glasgow, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398770.

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26

Anandarajah, Arumugam. "Fracture mechanics of adhesive joints in shear." Thesis, University of Dundee, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357160.

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27

Portillo, Oscar. "Fracture mechanics of bitumen and asphalt mixes." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608512.

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28

Abdul, Manan Muhamad Saifuildin. "Fracture mechanics analysis of multiple edge cracks." Thesis, University College London (University of London), 2008. http://discovery.ucl.ac.uk/1444086/.

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This thesis is concerned with the evaluation of crack propagation in the presence of other cracks within the same two-dimensional body. The parameter known as the Stress Intensity Factor (SIF) is used within Linear Elastic Fracture Mechanics (LEFM) to predict crack propagation rate knowing the appropriate material properties. Unfortunately the number of SIF solutions for multiple cracks is very small especially for real engineering cases. This thesis investigates the use of the SIF weight function for the efficient evaluation of SIFs for two one-dimensional cracks in close proximity to each ot

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29

Huang, Xiyong. "Probabilistic fracture mechanics by boundary element method." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6192.

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In this work, a new boundary element method is presented for the Probabilistic Fracture Mechanics analysis. The method developed allows the probabilistic analysis of cracked structure accomplished by the dual boundary element method (DBEM), in which the traction integral equation is used on one of the crack faces as opposed to the usual displacement integral equation. The stress intensity factors and their first order derivatives are evaluated for mode-I and mixed-mode fracture problems. A new boundary element formulation is derived and implemented to evaluate the design variables sensitivitie

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30

Alessi, Roberto. "Variational approach to fracture mechanics with plasticity." Palaiseau, Ecole polytechnique, 2013. http://pastel.archives-ouvertes.fr/pastel-00847970.

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Dans le cadre des systèmes rate-independent, un modèle de plasticité avec endommagement, visant à la description des processus de rupture ductile, est proposé et étudié par une formulation variationnelle. Une fissure cohésive, ou ductile, se produit lorsque le champ de déplacement subit une discontinuité, tout en étant encore associé à une contrainte de traction non nulle. Prévoir et décrire efficacement les phénomènes de rupture ductile est une tâche cruciale pour de nombreux matériaux d'ingénierie (métaux, polymères,. . . ), comme en témoigne le grand intérêt de la communauté scientifique su

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31

Pfeil, Michael Channing. "A fracture mechanics analysis of electronic packages /." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487862399450324.

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32

Liu, Shubin Carleton University Dissertation Engineering Aerospace. "Boundary element analysis in contact fracture mechanics." Ottawa, 1994.

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33

Yan, Jia-Hau. "Elastic-plastic fracture mechanics of compact bone." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011641.

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34

Li, Yong <1985&gt. "Fracture Mechanics Investigation of Structures with Defects." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5946/1/li_yong_tesi.pdf.

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Abstract (sommario):

Fracture mechanics plays an important role in the material science, structure design and industrial production due to the failure of materials and structures are paid high attention in human activities. This dissertation, concentrates on some of the fractural aspects of shaft and composite which have being increasingly used in modern structures, consists four chapters within two parts. Chapters 1 to 4 are included in part 1. In the first chapter, the basic knowledge about the stress and displacement fields in the vicinity of a crack tip is introduced. A review involves the general methods of

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35

Li, Yong <1985&gt. "Fracture Mechanics Investigation of Structures with Defects." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5946/.

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Abstract (sommario):

Fracture mechanics plays an important role in the material science, structure design and industrial production due to the failure of materials and structures are paid high attention in human activities. This dissertation, concentrates on some of the fractural aspects of shaft and composite which have being increasingly used in modern structures, consists four chapters within two parts. Chapters 1 to 4 are included in part 1. In the first chapter, the basic knowledge about the stress and displacement fields in the vicinity of a crack tip is introduced. A review involves the general methods of

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36

Oates, William Sumner. "Fracture of Ferroelectric Materials." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4769.

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Ferroelectric materials continue to find increasing use in actuator, sensor and transducer design. Questions regarding lifetime and reliability remain a concern due to the inherent low fracture toughness and complex material behavior. The poling procedure required for use in actuator and sensing devices introduces anisotropy in elastic and dielectric coefficients as well as piezoelectric coupling between the mechanical and electrical fields. This introduces complex fracture behavior which necessitates advanced analytical techniques and fracture characterization. In this dissertation, fract

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37

Gerde, Eric Stendahl. "Fracture and friction /." Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3008334.

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38

Arteaga-Gomez, Joaquin M. "Development of crack generation and propagation algorithms for computational structural mechanics." Fairfax, VA : George Mason University, 2009. http://hdl.handle.net/1920/3430.

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Thesis (M.S.)--George Mason University, 2009.<br>Vita: p. 64. Thesis director: Rainald Löhner. Submitted in partial fulfillment of the requirements for the degree of Master of Science in Computational Sciences. Title from PDF t.p. (viewed June 10, 2009). Includes bibliographical references (p. 60-63). Also issued in print.

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39

Hosoglu, Selcuk. "Cellular automata an approach to wave propagation and fracture mechanics problems." Thesis, Monterey, Calif. : Naval Postgraduate School, 2006. http://bosun.nps.edu/uhtbin/hyperion.exe/06Dec%5FHosoglu.pdf.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, December 2006.<br>Thesis Advisor(s): Young W. Kwon. "December 2006." Includes bibliographical references (p. 63-64). Also available in print.

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40

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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41

Hu, Kai Xiong. "Stress and fracture analysis for systems with inhomogeneities." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186588.

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The inhomogeneities situated in materials render the diversification of composite families, and can provide synergistic effects for tailoring materials to a specified and often hostile environment. The work presented here focuses on the fracture and stress analysis of systems with various inhomogeneities. In Chapter 1, interactions among cracks and rigid-line inclusions are investigated. Rigid-line inclusions are represented by a distribution of forces while cracks are modeled by the standard dislocation approach. Chapter 2 presents an analysis of composite systems with interacting cracks and

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42

Dhansay, Nur Mohamed. "Fracture mechanics based fatigue and fracture toughness evaluation of SLM Ti-6Al-4V." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/24326.

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The focus of this research project was to determine experimentally the fatigue and fracture toughness characteristic, from a fracture mechanics perspective, of Ti-6Al-4V titanium alloy manufactured by Selective Laser Melting (SLM). Three build orientations are considered where a fatigue crack is grown parallel and two are grown perpendicular to the build orientation. The project then endeavours to generate a fracture mechanics based Paris equation from the fatigue crack growth rate results and together with the fracture toughness, fatigue life predictions may be determined based on crack propa

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43

Gieseke, Brian G. "Mechanics and mechanisms of creep-fatigue crack growth in Cu-1 wt% Sb." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/19982.

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44

Yin, Xiaochen. "Concrete fracture process zone characteristics /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/10183.

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45

Hauch, Jens Andreas. "Dynamic fracture in brittle materials /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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46

Bahr, Douglas. "Fracture mechanics characterization of a single crystal nickel alloy." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/19604.

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47

Zhang, Wenbing. "A method and program for quantitative description of fracture data and fracture data extrapolation from scanline or wellbore data /." May be available electronically:, 2001. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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48

Abbas, Safdar [Verfasser]. "High gradient XFEM for fracture mechanics / Safdar Abbas." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2012. http://d-nb.info/1025514246/34.

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49

Terfas, Osama Abdulhamid. "Quantification of constraint in three-dimensional fracture mechanics." Thesis, University of Glasgow, 2010. http://theses.gla.ac.uk/2119/.

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Abstract The role of crack tip constraint in three dimensional fracture mechanics has been investigated under elastic-plastic conditions using finite element techniques. Out-of-plane constraint loss has been identified by comparing the mean stress of the three dimensional cracked body with a reference plane strain configuration. This has allowed the quantification of constraint loss due to thickness. This is important for fitness-for-service procedures where the use of standard thick deeply cracked samples inherently leads to conservative assessments. The proximity to plane–strain conditions w

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50

Moore, Andrew J. "Strain analysis using ESPI applied to fracture mechanics." Thesis, Loughborough University, 1993. https://dspace.lboro.ac.uk/2134/11889.

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Abstract (sommario):

Electronic speckle pattern interferometry (ESPI) has become an established technique for surface deformation studies. However, difficulties remain in the practical use of ESPI, primarily because results require skilled and time-consuming interpretation. The work reported here has enabled automated acquisition and processing of ESPI displacement data. Further processing has enabled the components of surface strain and stress to be, determined automatically. Such measurements are of great importance for experimental fracture mechanics studies, a quantitative approach to measuring the severity of

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