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Rozprawy doktorskie na temat „Strength of materials”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Soutsos, Marios Nicou. "Mix design, workability heat evolution and strength development of high strength concrete." Thesis, University College London (University of London), 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308062.

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A literature survey of the properties and uses of high strength concrete, defined for this study as having a strength in excess of 60 N/tnm2, has shown that of prime need is a systematic, reproducible procedure for attaining high strength concrete. The "Maximum Density Theory", i.e. the requirement that the aggregate occupies as large a relative volume as possible, has been adopted as an approach to optimisation of the mix proportions. However, this does not consider the effect that the aggregate suIface area has on the requirement of excess paste for lubrication. To investigate the combined e

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2

Wang, Congwei. "On the strength of defective graphene materials." Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/9065.

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Graphene is the first 2D material consisting of carbon atoms densely packed into planar structures. Graphene oxide (GO) is the intermediate derivative of chemically-produced graphene, which retains 2D basal plane structures but is also decorated with functional groups along the basal plane and edges. This functionality allows self-assembly of planar sheets into a paper-like material. However, formations of both intrinsic defects within the sheet structures as well as larger scale extrinsic defects in the paper are expected to significantly degrade mechanical performance. Strength provides the

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3

Bi, Wu. "Racking Strength of Paperboard Based Sheathing Materials." Miami University / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=miami1091059928.

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4

Stone, Robert Michael 1957. "Strength and stiffness of cellular foamed materials." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/289577.

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The use of cellular foams as a core material in light-weight optical and structural systems is of considerable interest. Research and development of these systems, however, have been hampered by the lack of material property data and uncertainty in the use of various suggested material characterizations and the associated constants of proportionality. ASTM standards were researched and, for the most part, found inadequate for testing cellular foam materials. The compression, tension and shear test methods developed are presented, as well as the results from physical tests on closed-cell SXATM

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5

Violette, Melanie Glenn. "Time-dependent compressive strength of unidirectional viscoelastic composite materials /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.

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6

Wen, Edward A. "Compressive strength prediction for composite unmanned aerial vehicles." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=959.

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Thesis (M.S.)--West Virginia University, 1999.<br>Title from document title page. Document formatted into pages; contains ix, 117 p. : ill. (some col.) Includes abstract. Includes bibliographical references (p. 83-84).

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7

Yeung, Conson. "Fracture statistics of brittle materials /." View the Table of Contents & Abstract, 2005. http://sunzi.lib.hku.hk/hkuto/record/B31490323.

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8

楊光俊 and Conson Yeung. "Fracture statistics of brittle materials." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B45015211.

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9

Altzar, Oskar. "Surface Characteristics and Their Impact on Press Joint Strength." Thesis, KTH, Mekanisk metallografi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-205919.

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Press fitting is a commonly used method in the assembly of shafts and gearwheels in gearboxes andare using the friction created between them to hold them together. To increase productivity Scania CVAB in Södertälje, Sweden, are going to replace the current hard machining method for layshafts. Whiletesting the new methods in rig it occurred that the gearwheel slipped in tangential direction towardsthe layshaft at a lower torque then with the current method even through all requirements on thelayshafts surface was meet. The purpose and aim with this study is to investigate differences betweenthe

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10

Case, Scott Wayne. "Micromechanics of strength-related phenomena in composite materials." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09122009-040447/.

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11

Young, Tyler Blaine. "Early-age strength assessment of cement-treated materials /." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1779.pdf.

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12

Branch, James. "Plastic properties of fresh high strength concrete." Thesis, University of Surrey, 2001. http://epubs.surrey.ac.uk/842953/.

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This thesis describes the novel test techniques that were developed to measure the parameters associated with the plastic shrinkage, and subsequent possible plastic shrinkage cracking, of high strength concrete. The parameters measured during the first 24 hours after placing were the stress- strain relationship, negative pore pressure and free shrinkage strain development. The plastic behaviour of eight high strength concrete mixes was quantified and these mixes were then tested to assess their propensity towards plastic shrinkage cracking, using restrained ring tests. A review of the paramete

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13

Ganneau, Francois P. 1979. "From nanohardness to strength properties of cohesive-frictional materials : application to shale materials." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28626.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2004.<br>Includes bibliographical references (p. 213-221).<br>Advanced experimental and theoretical micromechanics such as nanoindentation makes it possible today to break down highly heterogeneous materials to the scale where physical chemistry meets (continuum) mechanics, to extract intrinsic material properties that do not change from one material to another, and to upscale the intrinsic material behavior from the sub-microscale to the macroscale. While well established for elastic properties

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14

El-Zein, Mohamad Samih. "Strength in notched and impact damaged laminates." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54521.

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The strength of notched and impact damaged laminates was studied. The solution for a plate containing an elliptic opening and inclusion was used as given by Lekhnitskii. The solution for the infinite plate, combined with laminate analysis to determine the ply stresses, and the average stress criterion proposed by Whitney and Nuismer were used to predict the notched strength. However, unlike Whitney and Nuismer, the average stress criterion was used at the ply level. The strength of off-axis unidirectional laminates was predicted by using a matrix oriented failure criterion applied at a critic

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15

Morata, Royes Joan. "Wear resistance of heat-treated Advanced High Strength Steels and casting." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-80526.

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The necessity to improve the durability of the machinery used in the milling industry has lead to several types of research. One study is focused on the plates that are located in the stationary and moving jaws of crushers to diminish particles sizes of Gneiss and Diabase rocks. Thus, one type of approach to increase its durability is by reducing the material loss of the plates. Amongst all the parameters to reduce the wear ratio that includes inputs from geometry to load, just the hardness input of the material can be in constant development. Consequently, there are two well-known types of he

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16

Ibrahim, Wan Mohd Azhar Bin. "Strength parameters of some brittle dental materials : Weibull statistics." Thesis, University of Newcastle Upon Tyne, 1991. http://hdl.handle.net/10443/563.

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There are many factors affecting the mechanical strength of a material. The effects of specimen size and strain rate (crosshead speed of testing) on the compressive, diametral tensile and flexural strengths some of the brittle dental materials are the main factors investigated in this study. The study was composed of two parts. The first part was to study the effect of specimen size and strain rate (crosshead speed of testing) on the compressive, diametral tensile and flexural strengths of a material tested. Weibull and Normal statistics were used to analyse the data. The analysis showed that

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17

Liao, Dongyi 1975. "Atomistic simulation of strength and deformation of ceramic materials." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/30003.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 2001.<br>Includes bibliographical references (p. 203-216).<br>This thesis is a study of atomistic measures of strength and deformation of ceramic materials, utilizing molecular dynamics (MD) simulation that incorporates newly developed theoretical models and computational algorithms to probe the microstructural effects in crystalline, amorphous, and nanocrystalline media. Specific issues of a materials property or mechanics of materials nature are addressed in the context of characterizing the limits to stren

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18

Choudhury, Ajmol H. "Structure, strength and defect characterisation of cement based materials." Thesis, Robert Gordon University, 2014. http://hdl.handle.net/10059/1031.

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In cement based systems, the residual stresses are created by internal expansion. This provides toughening by the release of the residual stresses as the macro-crack propagates. While circumstantial evidence of the residual stresses exist (e.g. micro-crack formation leading to permanent deformation in flexural tests), it is very difficult to observe the mechanism in action. The quantitative estimate of the changes occurring in such cement-based systems is challenging due to the anisotropy and complexity of the material. Non-Destructive Testing (NDT) techniques were used in this research to obs

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19

Cazamias, James Ulysses. "Characterizing the dynamic strength of materials for ballistic applications /." Full text (PDF) from UMI/Dissertation Abstracts International, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p3004229.

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20

Wright, Wayne Clifton Augustus. "Blending of polyethylene materials for pipe applications." Thesis, Brunel University, 1989. http://bura.brunel.ac.uk/handle/2438/7120.

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Melt blending of polyethylene, in particularly HDPE and LLDPE, have been shown to be a major success, especially in the film markets. In this thesis studies are reported on the stress rupture performance of pipes produced from selected polyethylene materials blended to a chosen MDPE pipe grade. The pipes were tested, notched or unnotched, at a single temperature of 80oC and at internal pressures designed to induce slit-mode failure. Results showed the simple concept of increasing the stress rupture performance of a pipe material by the addition of a higher molecular weight polymer was invalida

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21

Li, Hong. "Experimental micromechanics of composite buckling strength." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/11719.

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22

Du, Lianxiang. "Laboratory investigations of controlled low-strength material." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3031045.

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23

Edwards, Derek Oswald. "An investigation into possible means of increasing the strength of lightweight high strength concrete." Thesis, [Hong Kong] : University of Hong Kong, 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1331161X.

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24

Olupot, Peter Wilberforce. "Assessment of ceramic raw materials in Uganda for electrical porcelain." Licentiate thesis, Stockholm : Royal Institute of Technology (KTH), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4013.

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25

張顯基 and Hin-kei Cheung. "Study on the strength of polymer melt." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31215087.

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26

Cheung, Hin-kei. "Study on the strength of polymer melt /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19471415.

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27

Asia, Winifred. "An in-vitro study of the physical properties of core build-up materials." University of the Western Cape, 2017. http://hdl.handle.net/11394/6307.

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Magister Chirurgiae Dentium - MChD (Prosthodontics)<br>The aim of this study was to evaluate and compare the physical properties of two core build-up materials (ParaCore and CoreXflow) and compare this to conventional composite material (Filtek Supreme Plus and SDR Flow) used as core build-up material.

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28

Maguire, Dawn Laurel. "Failure mechanisms in VLSI bonds subjected to mechanical and environmental stresses." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/30523.

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29

Haidemenopoulos, Gregory N. "Dispersed-phase transformation toughening in ultrahigh-strength steels." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14564.

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30

Gedeon, Steven Anthony. "Hydrogen assisted cracking of high strength steel welds." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14842.

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31

Hou, An. "Strength of composite lattice structures." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/12475.

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32

Heying, Jamie John Gratton David G. "Flexural strength of interim fixed prosthesis materials after simulated function." [Iowa City, Iowa] : University of Iowa, 2009. http://ir.uiowa.edu/etd/377.

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33

Fahad, M. K. "The strength of brittle materials under complex states of stress." Thesis, University of Newcastle Upon Tyne, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315564.

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34

Bouzalakos, Steve. "Controlled Low-Strength Materials Containing Solid Waste from Minerals Bioleaching." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/4265.

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Sustainable treatment and disposal of mine waste is a serious environmental issue faced by the mining industry worldwide. Conventional methods of mine waste management predominantly involve indefinite retention in engineered tailings dams. The cost and liability of such surface storage facilities have increased significantly in recent years as an outcome of stringent environmental legislation and mine closure requirements gradually transforming the economics of mine waste disposal. Backfill methods, particularly cemented paste backfill, are increasingly perceived as sustainable, environmentall

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35

Hatzitheodorou, Alexandros. "In-situ strength development of concretes with supplementary cementitious materials." Thesis, University of Liverpool, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441936.

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36

Heying, Jamie John. "Flexural strength of interim fixed prosthesis materials after simulated function." Thesis, University of Iowa, 2009. https://ir.uiowa.edu/etd/377.

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Statement of Problem There are limited studies evaluating the effect of a cyclic load on interim fixed prosthetic materials and its effect on flexural strength. Purpose of Study 1) To verify the flexural strength of previously studied interim fixed prosthetic materials. 2) To establish the flexural strength of new, advanced generation and untested interim fixed prosthetic materials. 3) To determine the effect of cyclic load on the flexural strength of interim fixed prosthetic materials. Materials and Methods Bar-type specimens of Caulk Temporary Bridge Resin, VitaVM CC, Protemp 3 Garant and Ra

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37

Schuetz, Daniel Philip. "Investigation of high strength stainless steel prestressing strands." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47744.

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Bridges and other coastal structures in Georgia and throughout the Southeast are deteriorating prematurely due to corrosion. Numerous corrosion initiated failures have occurred in precast prestressed concrete (PSC) piles and reinforced concrete (RC) pile caps, leading to the costly repair and replacement of either the entire bridge or the affected members. With the Federal Highway Administration's goal of a 100-year bridge service life and recent legislative action such as the Bridge Life Extension Act, new emphasis has been placed on the development and implementation of new corrosion mitigat

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38

Ryan, Joanne Maureen. "Relating moisture ingress to component strength and stiffness for carbon-fibre composites." Thesis, Swansea University, 2011. https://cronfa.swan.ac.uk/Record/cronfa42389.

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Moisture diffusion studies were performed using unidirectional (UD) tape and quasiisotropic (QI) woven 5-harness satin fabric, carbon fibre reinforced (CFR) epoxy composite materials. Firstly the moisture constants, (i.e. diffusion coefficient, D[x], and equilibrium moisture content, M[max]) were experimentally derived at 70°C and 85% relative humidity (%RH), for the two CFR materials. To investigate moisture absorption as a function of %RH test coupons were conditioned to differing equilibrium moisture levels viz., 70°C/60%RH, 70°C/75%RH, 70°C/85%RH, and 70°C/95%RH. Also o

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39

Ericsson, Mats. "Fatigue Strength of Friction Stir Welded Joints in Aluminium." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160.

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40

Yao, Jian. "High strength and high modulus electrospun nanofibres." Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/9120.

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In the last two decades, a rapidly growing polymer processing technology, electrospinning, has attracted great interests as it provides a viable and simple method to create ultra-fine continuous fibres. Despite the potential utilization of electrospun nanofibres in many fields, their success is limited so far due to their poor mechanical properties compared to corresponding textile fibres made from the same polymers, which is mainly ascribed to the low degree of orientation and chain extension of the macromolecules along the fibre axis in such fibres. In this thesis, first an in-depth review o

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41

Konstantarakis, Christos. "Hydrogen degradation of high strength steel weldments." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/47338.

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Thesis (Ocean. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1993, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science & Engineering, 1993.<br>Includes bibliographical references (leaves 37-43).<br>by Christos Konstantarakis.<br>M.S.<br>Ocean.E.

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42

Banna, Trinadha Rao. "The retentive strength of bonded amalgam restorations." Thesis, University of the Western Cape, 2005. http://hdl.handle.net/11394/2040.

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Magister Scientiae - MSc<br>Amalgam bonding agents have been shown to enhance retention of amalgam restorations by mechanical means. However, recent studies showed that the use o glass ionomer cements and resin cements as lining and bonding materials to amalgam restorations will increase the retentive strength of the amalgam restorations, hence reducing the micro leakage and secondary caries. The purpose of this study was to compare the relative retentive strength of conventional amalgam restorations and bonded amalgam restorations using resin adhesive, glass ionomer cements and resin cements.

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43

Lee, Seunghun Marghitu Dan B. "Impacts of kinematic links with a granular material." Auburn, Ala., 2009. http://hdl.handle.net/10415/1751.

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44

Clarke, D. A. "The strength of model composites incorporating silicon carbide fibres." Thesis, University of Surrey, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380359.

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45

Cui, Guiyong. "Experimental study of the through-thickness strength of laminated composites." Thesis, University of Oxford, 1994. http://ora.ox.ac.uk/objects/uuid:80258f41-5358-447c-8047-0769c93f062c.

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Complicated structures made of fibre reinforced laminates will suffer the failure of delamination which is the main through-thickness failure mode and is usually caused by the combined through-thickness stress state. Three tests, namely the oblique test, the waisted C-specimen test and the notched beam test, have been developed to reveal the failure activities under the combined stress state of in-plane normal stress, through-thickness normal stress and interlaminar shear, and, as a part of the big project, to establish a 3-D failure map in the coordinates of the three stress components. All t

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46

Owens, Anthony Taylor Tippur Hareesh V. "Development of a split Hopkinson tension bar for testing stress-strain response of particulate composites under high rates of loading." Auburn, Ala., 2007. http://repo.lib.auburn.edu/Send%2002-04-08/OWENS_ANTHONY_54.pdf.

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47

Widjaja, Budi R. "Analytical investigation of composite diaphragms strength and behavior." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07112009-040307/.

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48

Brach, Stella. "Strength properties of nanoporous materials : theoretical analyses and molecular dynamics computations." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066618.

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L’objectif principal de la thèse a été d’étudier les propriétés de résistance des matériaux nanoporeux par des approches théoriques et numériques. Dans le contexte des méthodes d’homogénéisation, des critères de résistance macroscopiques ont été établis par des approches analytiques à l’homogénéisation non-linéaire et à l’analyse limite. Les critères de résistance ainsi obtenus permettent de tenir en compte les effets de taille, tout en améliorant les formulations déjà existantes. En outre, dans le but de servir de référence pour la calibration et/ou la validation des modèles analytiques, des

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49

Caliskan, Ari Garo. "Micromechanics-based approach to predict strength and stiffness of composite materials." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-09052009-041025/.

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50

AHMAD, SAJJAD. "Innovative mix design of cementitious materials for enhancing strength and ductility." Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2604771.

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Cement based composites i.e. paste, mortar and concrete are the most utilized materials in the construction industry all over the world. Cement composites are quasi-brittle in nature and possess extremely low tensile strength as compared to their compressive strength. Due to their low tensile strength capacity, cracks develop in cementitious composites due to the drying shrinkage, plastic settlements and/or stress concentrations (due to external restrains and/or applied stresses) etc. These cracks developed at the nanoscale may grow rapidly due to the applied stresses and join together to form

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