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Dissertations / Theses on the topic 'Fracture toughness'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Chung, Wai-Nang. "Fracture toughness and creep fracture studies of polyethylenes." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46720.

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2

Daming, Duan. "Fracture toughness and term fracture behaviour of polyethylenes." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243909.

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3

Hayes, D. A. "The fracture toughness of dental amalgams." Thesis, Open University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317412.

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4

SAKAIDA, Yoshihisa, and Keisuke TANAKA. "Evaluation of Fracture Toughness of Porous Ceramics." The Japan Society of Mechanical Engineers, 2003. http://hdl.handle.net/2237/9181.

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5

Sieurin, Henrik. "Fracture toughness properties of duplex stainless steels." Doctoral thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3964.

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6

Kuhl, Adam. "A technique to measure interfacial fracture toughness." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/16626.

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7

Westphal, Mark Emil. "Fracture toughness of coral graphite cast iron." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/16892.

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8

Tinston, S. F. "Fracture toughness of mechanised pipeline girth welds." Thesis, University of Salford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381698.

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9

Smith, Matthew S. "Bone fracture toughness of estrogen deficient rabbits." Morgantown, W. Va. : [West Virginia University Libraries], 2003. http://etd.wvu.edu/templates/showETD.cfm?recnum=3094.

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Thesis (M.S.)--West Virginia University, 2003.<br>Title from document title page. Document formatted into pages; contains x, 100 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 91-96).

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10

de, Faria Teixeira Rita. "Translaminar fracture toughness of CFRP : from the toughness of individual plies to the toughness of the laminate." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/26112.

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The translaminar fracture toughness of fibre reinforced polymers (FRP) is important for characterising the failure resistance of composite structures. Measuring the translaminar fracture toughness for any possible layup is not feasible. Therefore, it is of interest to relate the translaminar toughness of a laminate to that of its plies. Numerous studies have measured the translaminar fracture toughness of composite laminates and of individual plies. However, any attempts to relate the two have so far been very limited, and restricted to initiation values. This work presents experimental and an

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11

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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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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12

To, Theany. "Fracture toughness and fracture surface energy of inorganic and non-metallic glasses." Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1S013/document.

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La ténacité et l’énergie de surface de fracture de verres, de vitrocéramiques et de composites à matrice en verre ont été étudiées. Tout d'abord, un test de flexion bi-axiale (configuration anneau/anneau) a été réalisé sur des verres de silice et des verre-à-vitres avec différentes conditions de surface afin d’identifier la relation entre le défaut de surface, la résistance et la ténacité du verre. Ensuite, trois méthodes d’expérimentation ont été mises en œuvre, principalement la méthode de poutre de flexion à pré-entaille droit (SEPB), la méthode de la poutre entaillée en chevron (CNB) et la

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13

Yang, Kao Z. "MENs Doped Adhesive and Influence on Fracture Toughness." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2487.

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Composites are in high demand; however, fasteners are often required for joining process and can reduce their advantages. One solution is adhesive bonding, but uncertainty exists regarding long term durability and the ability to interrogate bonds noninvasively. One potential solution to qualify bond integrity over its service life is to dope an adhesive with magneto-electric nanoparticles (MENs). MENs can yield output magnetic signatures that are influenced by bond quality and damage state. In this study, adhesives have been doped with MENs prior to bonding at 1% volume concentration. For opti

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14

Cretegny, Laurent. "Fracture toughness behavior of weldments at elevated temperature." Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/19957.

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15

Bernard, Marie. "The development of a new fracture toughness procedure /." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74059.

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16

Ma, Wei. "Fracture toughness characterization of thin Ti/SiC composites." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/9324.

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Titanium based alloys reinforced uniaxially with silicon carbide fibres (Ti/SiC) are advanced and innovative materials for aerospace vehicles. To avoid potential problems, these new materials should be extensively tested and analyzed before application. This research focuses on experimental fracture toughness study on 0.5 mm thick Ti/SiC composite materials for aerospace applications. The fracture toughness tests are mainly based on BS 7448 with some modifications for transversely isotropic behaviour of the composite materials. By loading on specimens in the direction perpendicular to the fibr

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17

Ratcliffe, J. G. A. "The interfacial fracture toughness characterisation of sandwich structures." Thesis, University of Liverpool, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399287.

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18

Li, Zhongtao 1971. "High fracture toughness and high modules silicone resins." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/8301.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2000.<br>Includes bibliographical references (leaves 159-163).<br>Rigid silicone resins, generally referred to as polyalkylsilsesquioxanes, are an important class of hybrid thermosetting polymers with both inorganic and organic characteristics. They have superior thermal stability, heat resistance, fire resistance, and still can be easily processed. Silicone resins recently have attracted much interest as low dielectric constant materials replacing silicon dioxide as interlevel dielectrics. Unfor

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19

Whitehead, Richard Donaldson. "Assessment of fracture toughness for polyethersulphone injection mouldings." Thesis, University of Surrey, 1988. http://epubs.surrey.ac.uk/848561/.

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This project assessed fracture toughness (K[IC] and G[IC]) for thin-section injection-moulded PES and for which there are no standard fracture-mechanics tests. Standard methods of testing are based on thick specimens that are easily available for metals but unusual for injection mouldings. Tests were, therefore, made which adapted the standard Mode-I (crack-opening) tests to the thin sections of injection-moulded discs. Then the question of the tests' validity arose. Were the elastic assumptions being met? If both critical Mode-I stress-intensity factor and strain-energy release rate were foun

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20

Kamat, Samir V. "Fracture toughness of particulate-reinforced aluminum-matrix composites /." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487592050230594.

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21

Sacks, Natasha. "The fracture toughness of ultrafine WC-Co Alloys." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/20181.

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Bibliography: pages 147-152.<br>This thesis examines the fracture toughness behaviour of a series of cemented carbides having carbide grain sizes between 0.35f.Lm and 4f.Lm, cobalt contents ranging from 6 to 15wt%, and vanadium carbide contents from 0 to 0.8wt%. A series of twenty-four ultrafine WC-Co alloys were sintered from powders produced through three different production routes, namely, the spray conversion process and two variations of the conventional powder production methods. A further twelve WC-Co alloys with three different carbide grain size distributions were produced through co

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22

McCarroll, Catherine Anne. "High rate fracture toughness measurement of laminated composites." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/9037.

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The aim of this research is to understand and analyse the behaviour of specimens used to measure fracture toughness in laminated composites when loaded at high displacement rates. Finite element (FE) analysis is used as a tool to investigate dynamic behaviour of rapidly loaded mode I intralaminar specimens and to investigate of the data reduction strategy. Finally, using knowledge from current literature and experience gathered from the FE analysis, an experimental test procedure for the measurement of intra-laminar fracture toughness at high loading rates is designed and evaluated. To gain co

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23

Kimu, Hyonmin. "Design of Bioactive Materials with High Fracture Toughness." Kyoto University, 1997. http://hdl.handle.net/2433/202290.

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24

Rys, Tomasz. "Mixed mode fracture toughness of stitched laminated composites." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0006994.

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25

Marnock, Patrick J. (Patrick Joseph). "Development of a Simplified Fracture Toughness Tool for Polymers." Thesis, University of North Texas, 1997. https://digital.library.unt.edu/ark:/67531/metadc278473/.

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This thesis presents research toward the development of a simple inexpensive fracture toughness tool for polymeric materials. Experiments were conducted to test the specimen configuration and the fracture toughness tool against an established ASTM standard for polymer fracture toughness, D5045, and a commonly used four-point bend method. The materials used in this study were polycarbonate and high density polyethylene. Reductions in both the production time and the variability resulting from the preparation of the specimens were addressed through the use of specially designed fixtures. The eff

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26

Browne, David J. "Fracture characteristics of coarse grained ceramics." Thesis, University of Newcastle Upon Tyne, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254026.

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27

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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28

Wu, Shang-Xian. "Fracture analyses and toughness : measurement of specimens with deep and shallow cracks." Thesis, The University of Sydney, 1990. https://hdl.handle.net/2123/26383.

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Slip—line ﬁeld analyses and ﬁnite element analyses have been conducted for three— and four-point bend specimens with deep and shallow cracks. The results show that under large scale yielding the stress and strain ﬁelds ahead of deep and shallow cracks are quite different and there is no single—parameter characteristics in these ﬁelds. Specially, the maximum hydrostatic stress is substantially lower ahead of shallow cracks than ahead of deep cracks and this strongly affects the fracture behaviour of specimens with shallow cracks. A preliminary crack length requirement for valid J—characterizati

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29

Horvath, Andrew T. "Chemical Methods for Improving the Fracture Toughness of Paper." Doctoral thesis, KTH, Fiberteknologi, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4752.

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Paper is a network material composed of a great number of fibers that interact with each other through fiber joints. In order to make a clear statement regarding observed changes being made in paper, it is vital to determine the structural level of paper that is being affected by chemical modifications. Polyelectrolytes having a wide range in molecular properties have been synthesized to investigate the adsorption behavior of cationic polyelectrolytes to cellulosic fibers. The interaction with the porous cell wall of cellulosic fibers is governed by the molecular properties of the polyelectrol

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30

Watring, Dillon S. "Development of Novel, Microscale Fracture Toughness Testing for Adhesives." FIU Digital Commons, 2017. http://digitalcommons.fiu.edu/etd/3474.

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The purpose of this thesis was to develop microscale fracture toughness tests to be performed in situ based off previously used macroscale fracture toughness tests. The thesis also was to use these tests to perform in situ analysis and imaging of reinforced adhesives during crack propagation. Two different fracture toughness tests were developed for this thesis through developing fixtures and sample geometry. A microscale double cantilever beam (DCB) test was developed for mode I fracture (opening mode). A microscale end notch flexure (ENF) test was developed for mode II fracture (sliding mode

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31

Bateman, Joseph A. "High temperature fracture toughness of Cr-Mo-V welds." Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/15025.

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32

Smith, Kevin. "Fracture Toughness of a Hyperelastic Material During Surgical Cutting." Honors in the Major Thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/1564.

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Despite being one of the most important organs of vertebrates, the material properties of skin are also one of the most poorly understood. In the field of designing medical devices and surgical tools there are significant advantages to having a model that describes the interaction of forces between a blade tip and skin during surgical cutting. In general, skin can best be described as a composite layer consisting of a viscoelastic dermis with interwoven collagen and elastin fibers beneath a superficial epidermis. The purpose of this research is to study the fracture toughness of porcine skin d

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33

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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34

Li, Yan. "Prediction of material fracture toughness as function of microstructure." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52999.

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Microstructure determines fracture toughness of materials through the activation of different fracture mechanisms. To tailor the fracture toughness through microstructure design, it is important to establish relations between microstructure and fracture toughness. To this end, systematic characterization of microstructures, explicit tracking of crack propagation process and realistic representation of deformation and fracture at different length scales are required. A cohesive finite element method (CFEM) based multiscale framework is proposed for analyzing the effect of microstructural hetero

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35

Rothwell, Glynn. "Fracture toughness determination using constraint enhanced sub-sized specimens." Thesis, Liverpool John Moores University, 2003. http://researchonline.ljmu.ac.uk/4971/.

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36

Prakash, Sunil. "Modeling the Constraint Effects on Fracture Toughness of Materials." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1259271280.

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37

Strebel, Jeffrey Jerome. "The measurement and origin of fracture toughness in polyethylene." Case Western Reserve University School of Graduate Studies / OhioLINK, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=case1056650936.

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38

Velpuri, Seshagirirao V. "Fracture Toughness Testing of Plastics under Various Environmental Conditions." Thesis, University of North Texas, 1997. https://digital.library.unt.edu/ark:/67531/metadc278346/.

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The primary objective of this study is to test the applicability to plastics of a fracture toughness testing tool developed for metals. The intent is to study pre-test conditioning of several plastic materials and the effect of the depth of the razor notch cut in the chevron notched fracture toughness test specimens. The study includes the careful preparation of samples followed by conditioning in various environments. Samples were subjected to laboratory air for a specific duration or to a controlled temperature-humidity condition as per the ASTM D1870. Some of the samples were subjected to v

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39

Swadener, John Gregory. "Primary fracture toughness mechanisms of a glass/epoxy interface /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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40

Kalarikkal, Sujith G. "Fracture toughness of graphite/epoxy laminates at cryogenic conditions." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0006960.

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41

Winfield, P. H. "Toughness development in fibre reinforced metals." Thesis, Cranfield University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259794.

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42

Naidu, Thevashen. "A fracture mechanics study of the fracture toughness testing techniques applied to brittle materials." Master's thesis, University of Cape Town, 2002. http://hdl.handle.net/11427/4960.

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Includes bibliographical references.<br>This dissertation describes an investigation into the application of fracture mechanics to brittle materials, with particular emphasis on the fracture toughness testing techniques used on these materials.

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43

Cai, Huasu. "The toughness of high strength aluminium alloys." Thesis, University of Newcastle Upon Tyne, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315472.

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44

Ayatollahi, Majid Reza. "Geometry and constraint effects in mixed mode fracture." Thesis, University of Bristol, 1998. http://hdl.handle.net/1983/fa0c832a-e66f-478a-a572-746f8ab21352.

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45

Shin, Dong-Woo. "Microstructure-property relationships of SiC fibre-reinforced borosilicate glass." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282096.

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46

Zhang, Zhuyao. "Microstructure and continuous cooling transformation of C-Mn-Ni and C-Mn-Ni-Mo weld metals." Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386602.

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47

Ingham, Edward John. "The development of impact toughness and resistance to slow crack growth in modified polyvinyl chloride and polyethylene pipe grade polymers." Thesis, Manchester Metropolitan University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271274.

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48

Kiiru, Beatrice Maiwa. "Effect of curing on the fracture toughness of composite materials." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19124/.

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This thesis studies the effect of the degree of cure of a prefabricated part on the fracture toughness of co-cured composite part. A novel resin system, Airstone 780E/785H, that is used in the manufacture of wind turbine blades, is under consideration. Chemical characterization of the resin tells us its curing behavior while thermal characterization analyses the material’s response to temperature variations. From these experimental findings,an optimized heat transfer model that can identify the degree of cure and the temperature distribution at any given time during the manufacturing process

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49

Nevalainen, Markku J. "The effect of speciment and flaw dimensions on fracture toughness /." Espoo : Technical Research Centre of Finland, 1997. http://www.vtt.fi/inf/pdf/publications/1997/P314.pdf.

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50

Rider, Andrew Chemistry Faculty of Science UNSW. "Surface Properties Influencing the Fracture Toughness of Aluminium-Epoxy Joints." Awarded by:University of New South Wales. School of Chemistry, 1998. http://handle.unsw.edu.au/1959.4/17804.

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This thesis systematically investigates the properties of the aluminium adherend which influence the fracture toughness of aluminium-epoxy adhesive joints in humid environments. The fracture energy of the adhesive joint exposed to a humid environment in comparison with the fracture energy in a dry environment provides a measure of the joint durability. A 500C and 95% relative humidity environment is used to simulate aging of an adhesive joint over several years under normal service conditions. Initially, surface roughness is found to have a significant influence on the fracture toughness of t

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