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Tesi sul tema "Ductility"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Mohamed, Z. M. E. Q. "Hot ductility of steels." Thesis, City University London, 1988. http://openaccess.city.ac.uk/8348/.

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The hot tensile test has been used for a variety of steels, to investigate the influence of such factors as inclusions, precipitation, phase transformation and grain size on hot ductility. Tests were performed in the temperature range 700-1000 °C and at a strain .4 _2 1 rates of (10 —10 S ), generally to simulate the conditions experienced during the straightening operation in the continuous casting process in which transverse cracks propagate. Two zones of reduced ductility can be identified. The Y-a transformation zone which has been shown to produce a significant ductility trough due to str

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2

Abu, Shousha R. I. "Hot ductility of steels." Thesis, City University London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305120.

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3

Wassouf, Mohamad. "Bond and ductility of concrete reinforced with various steel bars surface and ductility conditions." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/6272/.

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Reinforced concrete is a wide field for researches and studies in civil engineering subject. It is due to the fact that reinforced concrete is the most widely used material for the infrastructure in the world. Reinforced concrete consists of two main materials: reinforcing steel and concrete, each of those two materials has its own effect on the performance of the structure. In this thesis, the change in RC performance due to different steel properties and specifications will be investigated. The study focuses on the bond interaction between steel and concrete and the flexural behaviour of RC

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4

Crowther, David Neville. "The hot ductility of steels." Thesis, City, University of London, 1986. http://openaccess.city.ac.uk/19368/.

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Hot tensile tests have been performed on a variety of plain carbon and micro-alloyed steels, in order to determine the influence of such factors as phase transformation, grain size and precipitation on hot ductility. The γ-∝ phase transformation has been shown to produce a significant ductility trough in the high temperature tensile behaviour of plain C steels, and factors which alter the A3 temperature, such as cooling rate and C content, have been shown to produce a change in the temperature at which the ductility trough occurs. This ductility trough is due to strain concentration in the fer

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5

Eon, Kang Shin. "Hot ductility of TWIP steels." Thesis, City University London, 2014. http://openaccess.city.ac.uk/13703/.

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TWIP (Twining Induced Plasticity) steel is very promising AHSS (Advanced High Strength Steel) grade owing to its superior toughness and ductility. Recently it has attracted the interest of the automotive and steelmaking industries, as the need for reducing weight to provide better fuel efficiency is of paramount importance with the gradual depletion of fuel resources. A high Al, TWIP steel is being commercially developed as Al has been found very well in delaying fraction in deep drawn products. However these steels are difficult to continuous cast and cracking can occur at the slab surface. T

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6

Occhiuzzi, Antonio. "Seismic ductility of base isolated structures." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/35011.

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7

Henriques, José Alexandre Gouveia. "Ductility requirements in shear bolted connections." Master's thesis, Departamento de Engenharia Civil, 2007. http://hdl.handle.net/10316/15762.

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8

Soesianawati, M. T. "Limited ductility design of reinforced concrete columns." Thesis, University of Canterbury. Department of Civil Engineering, 1986. http://hdl.handle.net/10092/3643.

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This report describes an experimental and analytical investigation of the strength and ductility of reinforced concrete columns. Four columns of square cross-section were tested under axial compression loading and cyclic lateral loading applied at mid-height which simulated seismic loading. The main variable investigated was the quantity of transverse confining steel used, which ranged between 17 to 46 percent of the NZS 3101:1982 recommended quantity for ductile detailing. The experimental results are reported in the form of lateral loaddisplacement and lateral load-curvatures hysteresis loop

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9

Lobato, de Sousa Monteiro de Morais Miguel Nuno. "Ductility of beams prestressed with FRP tendons." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614171.

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10

Wolff, Ira M. "Ductility in high chromium super-ferritic alloys." Doctoral thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/22200.

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Includes reprints of author's related articles.<br>Bibliography: pages 187-201.<br>The competition between microfracture and plastic flow has been studied in relation to the thermomechanical processing parameters and minor element chemistry of wrought super-ferritic alloys based on a composition of Fe-40wt% Cr. These alloys have been developed for corrosion-resistant applications, specifically by micro-alloying with platinum group metals to induce cathodic modification, but their use has been hampered by inadequate toughness at ambient temperatures. Brittle cleavage of the alloys is a conseque

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11

POZZA, LUCA. "Ductility and behaviour factor of wood structural systems - Theoretical and experimental development of a high ductility wood-concrete shearwall system." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3422988.

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This dissertation focuses on the seismic behavior, ductility and dissipative capacity of modern timber buildings. A number of innovations in the field of timber structures are reported with special regard to the modeling techniques suitable for timber joints and to the characterization of the seismic behavior of modern timber systems. A preliminary overview on the seismic-resistant timber building technology and on their evolution from the past to nowadays is reported in the introduction of this thesis work. A review of the state of art about the available seismic codes is also reported and t

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12

Gardner, Christopher Andrew. "Ductility capacity of HPS70W net-section tensile members /." Diss., ON-CAMPUS Access For University of Minnesota, Twin Cities Click on "Connect to Digital Dissertations", 2001. http://www.lib.umn.edu/articles/proquest.phtml.

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13

Dávila-Sänhdars, Migual Angel. "Ductility of RC beams with FRP reinforcing bars /." Title page, synopsis and contents only, 1998. http://web4.library.adelaide.edu.au/theses/09ENS/09enss127.pdf.

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14

Lau, Tak-bun Denvid. "Flexural ductility improvement of FRP-reinforced concrete members." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B38907756.

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15

Watson, Soesianawati. "Design of reinforced concrete frames of limited ductility." Thesis, University of Canterbury. Department of Civil Engineering, 1989. http://hdl.handle.net/10092/3745.

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An experimental programme was carried out to investigate the flexural strength and ductility. of reinforced concrete columns under simulated earthquake loading. The main variable examined was the quantity of transverse reinforcement for concrete confinement. The experimental results were described and compared with theoretical studies. It was found that to achieve adequate ductility in columns, the current New Zealand concrete design code NZS3101:1982 equations for concrete confinement need to be refined. Using design charts for ductility, which were previously derived from a theory for cyclic

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16

Lau, Tak-bun Denvid, and 劉特斌. "Flexural ductility improvement of FRP-reinforced concrete members." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B38907756.

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17

Du, Yingang. "Effect of reinforcement corrosion on structural concrete ductility." Thesis, University of Birmingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368516.

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This thesis presents the experimental and analytical results to investigate the effect of corrosion on the mechanical properties of reinforcing bars and concrete beams, with particular reference to their ductility. In the experimental works, specimens were electrochemically corroded, before they were loaded to failure. In the finite element analysis, the corrosion of reinforcement was modelled as either internal pressure or radial expansion around corroded bars. The study indicates that the amount of corrosion to cause cracking at the bar and concrete surfaces almost linearly increased with th

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18

Diao, Hele. "Carbon fibre reinforced polymer composites with enhanced ductility." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/44273.

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Abstract (sommario):

Carbon fibre reinforced polymers (CFRPs) have high strength and stiffness, low density, long fatigue life in the fibre direction and good corrosion resistance. Nowadays, CFRPs are been used in aeronautics, wind turbine blades, sports goods and civil industry. However, one fundamental limitation of CFRPs is their brittleness (low ductility): CFRPs fail catastrophically at a relatively low strain (1.5% to 1.8%) under the tension with little warning or residual load-carrying capacity. To overcome this weakness, there is considerable interest to enhance the ductility of CFRPs exhibiting increased

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19

Li, Jian Xing. "Ductility and fracture mechanisms of particulate filled thermoplastics." Case Western Reserve University School of Graduate Studies / OhioLINK, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=case1060703053.

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20

Fuller, Jonathan. "Pseudo-ductility of thin ply angle-ply laminates." Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.683726.

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Composite materials usage is limited by the sudden, brittle failure they often exhibit. It has been shown in this work that it is possible to remove this inherent limitation and enlarge the design space by using thin ply angle-ply laminates that exhibit a non-linear 'pseudo-ductile' stress-strain response. Characterisation of the spread tow thin ply carbon-epoxy prepreg material (ply thickness of 0.03 mm) was conducted in order to allow an experimental study of the potential for pseudo-ductility. It has been shown that highly non-linear stress-strain responses can be achieved with angle-ply la

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21

Shitindi, Rowland V. "IMPROVEMENT OF DUCTILITY IN FRP-CONCRETE FLEXURAL MEMBERS." Kyoto University, 1999. http://hdl.handle.net/2433/181308.

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22

Jamwal, Ranbir Singh. "Microstructural origins of variability in the tensile ductility of dual phase steels." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39477.

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Quantitative relationships among processing parameters, microstructure, and material properties are of considerable interest in the context of development of robust processing routes that optimize the required material properties. As a result, the scientific literature contains a large number of experimental and theoretical studies on microstructure-properties relationships. Fracture sensitive mechanical properties such as ductility, ultimate tensile strength, fatigue life, and fracture toughness depend on the average microstructural parameters as well as the distributions of microstructural p

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23

El-wazri, Abdelbaset M. "Effect of thermal history on hot ductility of steel." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0022/MQ50604.pdf.

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24

Ingram, Gregory O. "Experimental characterization of the effect of inertia on ductility." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/16087.

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25

El-Wazri, Abdelbaset M. "Effect of thermal history on hot ductility of steel." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=20904.

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One of the major quality problems encountered in continuous casting is the formation of transverse cracks, which is partly due to the poor hot ductility of the cast steel. In this work, high temperature tensile testing is used to determine the hot ductility of a Nb-Ti and Ti-B microllayed steels. The influence of reheat treatment on hot ductility of the alloys is studied. In order to accomplish this task, steel specimens were reheated near the incipient melting temperature, and subsequently tensile tested to fracture at a strain rate typical of the unbending operation over a range of temperatu

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26

Davies, Paul. "Ductility and Deformability of FRP Strengthened Reinforced Concrete Structures." Thesis, University of South Wales, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517957.

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27

Ratkovich, John. "Processing and elevated temperature ductility of Aluminum alloy 7475." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27223.

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28

Roberts, R. J. "The elasticity, ductility and fracture toughness of pharmaceutical powders." Thesis, University of Bradford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320442.

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29

Chuang, Eugene (Eugene Yu) 1975. "Ductility enhancement of high performance cementitious composites and structures." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/33272.

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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2002.<br>Includes bibliographical references (p. 280-287).<br>High performance cementitious composites (HP2C) are a new generation of fiber reinforced cementitious composites (FRCC) with substantial improvements in mechanical behavior. The most important development in these HP2C materials may be the nearly elasto-plastic ductile behavior, which allows safe exploitation of the tensile and shear capacity in structural elements. This thesis presents a comprehensive investigation into the ductili

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30

Azizi, Abdul R. "Modelling moment redistribution in continuous reinforced concrete beams." Thesis, Durham University, 1996. http://etheses.dur.ac.uk/1578/.

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31

Kim, SangHun Aboutaha Riyad S. "Ductility of carbon fiber-reinforced polymer (CFRP) strengthened reinforced concrete." Related Electronic Resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2003. http://wwwlib.umi.com/cr/syr/main.

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32

Fielding, Lucy Chandra Devi. "Understanding toughness and ductility in novel steels with mixed microstructures." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/245654.

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The purpose of the work presented in this thesis was to explore and understand the mechanisms governing toughness, ductility and ballistic performance in a class of nanostructured carbide-free bainite-austenite steels, sometimes known as ‘superbainite’. The mechanical properties of these alloys have been extensively reported, but their interpretation is not clear. The thesis begins with an introduction to both the relevant nanostructures and some of the difficulties involved in explaining observed properties, alongside a summary of the role of mixed- microstructures in alloy development. An ov

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33

Ewen, Kristian A. J. "Ductility in FRP rods for concrete reinforcement by interfacial shearing." Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/10798.

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Non-corrosive reinforcement of concrete provides great potential for reducing life cycle costs (LCC) of highway infrastructure (bridge decks and columns, light-standards, dividers) and concrete structures near water (piers, retaining walls, platforms). This is especially important in areas where salts are common (cold weather road salting, coastal regions) and is achieved by extending the life of structures and the period between major repairs. Costs of infrastructure rehabilitation due to corrosion of reinforcement are estimated to be $1.2 billion dollars in Ontario in the next few years, and

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34

Zaina, Mazen Said Civil &amp Environmental Engineering Faculty of Engineering UNSW. "Strength and ductility of fibre reinforced high strength concrete columns." Awarded by:University of New South Wales. School of Civil and Environmental Engineering, 2005. http://handle.unsw.edu.au/1959.4/22054.

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The main structural objectives in column design are strength and ductility. For higher strength concretes these design objectives are offset by generally poor concrete ductility and early spalling of the concrete cover. When fibres are added to the concrete the post peak characteristics are enhanced, both in tension and in compression. Most of the available experimental data, on fibre reinforced concrete and fibre reinforced high strength concrete columns, suggest that an improvement in both ductility and load carrying capacity due to the inclusion of the fibres. In this thesis the ductility

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35

Mostofinejad, Davood. "Ductility and moment redistribution in continuous FRP reinforced concrete beams." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ26859.pdf.

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36

Zahn, Franz August. "Design of reinforced concrete bridge columns for strength and ductility." Thesis, University of Canterbury. Department of Civil Engineering, 1985. http://hdl.handle.net/10092/2872.

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Methods for the design of reinforced concrete bridge columns and piers for strength and ductility are considered. The investigations cover the following areas. An experimental investigation of the influence of reinforcing steel grade and amount of confining steel on the stress-strain behaviour of confined concrete is presented. The results are discussed and compared with theoretical models. Special attention is given to the possibility of fracture of the confining steel. An extensive experimental investigation into the ductile performance of a range of reinforced concrete columns is presented.

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37

Cowley, Andrew. "Hot ductility and its relationship to transverse cracking in steels." Thesis, City University London, 2004. http://openaccess.city.ac.uk/8416/.

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The influence of the Ara on the hot ductility of steels was examined. Tensile samples were heated to 1603K, cooled at 60Kmin" and tested in the temperature range 1323-873K at a strain rate of 3x10-3S-1. The Ara was altered by variations in C, (0.1 to 0.15%C), Mn, (0.6 to 1.4%Mn), Si (0.1 to 0.5%Si) and P, (0.001 to 0.025%P). Elements that raise the Ara e. g. Si and P were found to lead to recovery in ductility at slightly higher temperatures at the low temperature end of the trough. However, reducing C levels to <0.1C had the most pronounced influence on hot ductility since ductility was then

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38

Zouzou, Ammar. "The ultimate strength and ductility of structural concrete corner joints." Thesis, Heriot-Watt University, 1993. http://hdl.handle.net/10399/1408.

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39

Li, Tieqiang. "The analysis and ductility requirements of semi-rigid composite frames." Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239925.

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40

Raffoul, Samar. "Development of confined rubberised concrete for high ductility structural applications." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/20030/.

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The global environmental and economic implications of the disposal of waste tyres have prompted research exploring valuable outlets for their components. Concrete is an inherently brittle material and can benefit from tyre rubber properties to achieve higher ductility and energy dissipation for special applications in locations of high deformation demands, such as coupling beams. Despite the prospective benefits, the use of rubber as partial mineral aggregate replacement negatively affects concrete workability and strength. Recent research has shown that the external confinement of RuC can ben

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41

Shrestha, Umesh Shahu. "Modified Composite Application to Improve Strength and Ductility ofStructural Components." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1418403567.

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42

Sjöström, Julia, and Helena Åkesson. "Investigation of Ductility Dip at 1000˚C in Alloy 617." Thesis, KTH, Materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-209823.

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Alloy 617 displays a ductility dip during straining at exactly 1000˚C, leading to brittle fracture. A sudden decrease in ductility appearing during Gleeble hot ductility tests of Ni-based superalloys is a well-known phenomenon, while its cause is unknown. Many mechanisms have been established as possible contributors to the issue, and in later years not one, but the simultaneous presence of several of these mechanisms were confirmed as the cause. The ductility dip leads to solid state cracking and a specific solid state cracking phenomenon known as ductility dip cracking is specifically common

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43

Mostofinejad, Davood Carleton University Dissertation Engineering Civil and Environmental. "Ductility and moment redistribution in continuous FRP reinfoced concrete beams." Ottawa, 1997.

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44

Hervillard, Thomas P. C. "Effectiveness of polymer fibers for improving the ductility of masonry structures." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Thesis/Fall2005/T%5FHervillard%5F110705.pdf.

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45

Ho, Yin Bon. "Enhancing the ductility of non-seismically designed reinforced concrete shear walls /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202006%20HO.

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46

Norouzi, Siavash. "A Micromechanical Model for Numerical Study of Rock Dilation and Ductility." Thesis, New Mexico Institute of Mining and Technology, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10688951.

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<p> The newly implemented micromechanical model in the CA2 computer program was studied in this work. The purpose was to address some of the issues in the numerical studies involving the Bonded Particle Model (BPM) including unrealistically low <i>q<sub>u</sub></i>/σ<sub> t</sub> ratios, overall dilation behavior, and the post-failure response of rocks. The plasticity model allows both tensile and shear softening of the filling material at the contact points of the particles. It is shown that for a more ductile material, there is less scatter of micro-cracking at the peak load. Furthermo

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47

Whittaker, Jarrod Talbott. "Ductility and Use of Titanium Alloy and Stainless Steel Aerospace Fasteners." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5796.

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The main purpose of this thesis is to investigate the ductility and application of titanium alloys, like titanium 6Al-4V, when used in aerospace fasteners compared to more conventional stainless steel aerospace fasteners such as A286. There have been concerns raised about the safe usability of titanium 6-4 in the aerospace industry due to its lack of strain hardening. However, there is a lack of data pertaining to this concern of safe usage which this thesis aims to address. Tensile tests were conducted to find the ductility indexes of these fasteners which quantify the amount of plastic to el

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48

Rahgozar, Mohammad Ali. "Ductility and strength demands in building structures subjected to earthquake forces." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0006/NQ32349.pdf.

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49

Randelius, Mats. "Influence of microstructure on fatigue and ductility properties of tool steels." Licentiate thesis, Stockholm : Materialvetenskap, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4624.

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50

Li, Xiaohui [Verfasser]. "Enhanced ductility of Mg alloys containing rare earth elements / Xiaohui Li." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2013. http://d-nb.info/1037333403/34.

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