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Dissertations / Theses on the topic 'Tensile flexure strength test'

Author: Grafiati

Published: 3 June 2025

Last updated: 1 August 2025

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1

Yin, Penghai. "Tensile Strength of Unsaturated Soils." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/41841.

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Desiccation-induced soil cracking is of significant interest in several engineering disciplines, which include geotechnical and geoenvironmental engineering, mining engineering, and agriculture engineering. The hydraulic, mechanical, thermal and other physico-chemical properties of unsaturated soils can be predominantly influenced due to cracks. Reliable information of these properties is required for the rational design and maintenance of earth structures taking account of the influence the soil-atmosphere interactions (e.g., for expansive soil slopes, earth dams, and embankments). In spite o

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2

Foster, Glenn C. "Tensile and Flexure Strength of Unidirectional Fiber-Reinforced Composites: Direct Numerical Simulations and Analytic Models." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36688.

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A Local Load Sharing (LLS) model recently developed by Curtin and co-workers for the numerical simulation of tensile stress-strain behavior in fiber-reinforced composites is used to predict the tensile strength of metal matrix composites consisting of a Titanium matrix and unidirectionally aligned SiC fibers. This model is extended to include the effects of free boundary conditions and non-constant load gradients and then used to predict the strength of a Ti-6Al-4V matrix reinforced with Sigma SiC fibers under 4-point flexure testing. The predicted tensile and flexure strengths agree ver

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3

Roth, Michael Jason 1975. "Flexural and tensile properties of thin, very high-strength, fiber-reinforced concrete panels." Master's thesis, Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-11062007-215816.

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4

Plochý, Ondřej. "Vývoj sklobetonů s vysokými mechanickými vlastnostmi." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-371943.

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This master thesis summarizes the current knowledge regarding the design and properties of glass fiber reinforced concrete products. It also deals with the design of a new concrete recipe for Dako spol. s.r.o company. There is verified effect of changes in input materials in real conditions the company to increase tensile bending strength above 20 MPa.In particular, verification of the use of building chemistry like superplasticizing additives, polymer-cement matrix or a change type or dose of glass fiber.

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5

Kannan, Manigandan. "The Microstructure, Hardness, Impact Toughness, Tensile Deformation and Final Fracture Behavior of Four Specialty High Strength Steels." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1311884520.

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6

Martoni, Luca. "Strength development of single beech wood veneers considering different climate conditions." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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La tesi di laurea è stata svolta presso l’Università di Scienze Applicate di Rosenheim, in Germania; il progetto di ricerca si basa sulla tecnica di rinforzo conosciuta come “Soil Nailing”, che consiste nella costruzione di un’opera di sostegno nella realizzazione di pareti di scavo o nel consolidamento di versanti instabili. L’obiettivo principale dell’elaborato sarà quello di valutare la fattibilità dell’impiego di tubi fabbricati con legno di faggio, in sostituzione dei chiodi d’acciaio comunemente utilizzati; la scelta di questo tipo di legno è dettata dalla larga disponibilità presente

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7

Baumgarten, Lars. "Gesteinsmechanische Versuche und petrophysikalische Untersuchungen – Laborergebnisse und numerische Simulationen." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2016. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-202612.

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Dreiaxiale Druckprüfungen können als Einstufenversuche, als Mehrstufenversuche oder als Versuche mit kontinuierlichen Bruchzuständen ausgeführt werden. Bei der Anwendung der Mehrstufentechnik ergeben sich insbesondere Fragestellungen hinsichtlich der richtigen Wahl des Umschaltpunktes und des optimalen Verlaufs des Spannungspfades zwischen den einzelnen Versuchsstufen. Fraglich beim Versuch mit kontinuierlichen Bruchzuständen bleibt, ob im Versuchsverlauf tatsächlich Spannungszustände erfasst werden, welche die Höchstfestigkeit des untersuchten Materials repräsentieren. Die Dissertation greift

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LEE, Tung-Ying. "THE EFECT OF IMPURITIES IN WATER FROM LAKE ERIE ON THE ADHESIVE STRENGTH OF ICE TO WIND TURBINE MATERIALS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1310744454.

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Dinh, Quoc Dan. "Brazilian test on anisotropic rocks." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2011. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-76331.

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The present work describes investigations on the anisotropic strength behavior of rocks in the splitting tensile test (Brazilian test). Three transversely isotropic rocks (gneiss, slate and sandstone) were studied in the Lab. A total of more than 550 indirect tensile strength tests were conducted, with emphasis was placed on the investigation of the influence of the spatial position of anisotropic weakness plane to the direction of the load on the fracture strength and fracture or fracture mode. In parallel, analytical solutions were evaluated for stress distribution and developed 3D numerical

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10

Krossa, Alexander. "Material characteristics of new ultra high-strength steels manufactured by Giflo Steels." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/236243/1/Alexander%2BKrossa%2BThesis%281%29.pdf.

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This thesis has investigated the material characteristics of the new high-strength steel (HSS) produced by Giflo Steels (F-series steel) using detailed experimental studies involving ambient and elevated temperature mechanical property tests, post-fire mechanical property tests and V-Charpy notch tests for hardness. Its findings have shown that the new F-series steel has an advantage over similar HSS as it has superior post-fire mechanical properties, while retaining also the other mechanical properties within the requirements of relevant design standards.

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11

Diaz, Infante Hernandez David Alberto. "Prediction and Prevention of Edge Fracture in Forming of AHSS." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1563371149338966.

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12

VIALE, NICOLA. "A new flat jack test for evaluating shear properties on unreinforced masonry." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2846617.

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13

Tazaly, Zeinab. "Punching Shear Capacity of Fibre Reinforced Concrete Slabs with Conventional Reinforcement : Computational analysis of punching models." Thesis, KTH, Bro- och stålbyggnad, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118825.

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Steel fibre reinforced concrete is not a novel concept, it has been around since the mid-1900s, but despite its great success in shotcrete-reinforced rock walls and industrial floors it has not made any impact on either beams or elevated slab. Apparently, the absence of standards is the main reason. However, the combination of steel fibre reinforced concrete and conventional reinforcement has in many researches shown to emphasize good bearing capacrty. In this thesis, two punching shear capacity models have been analysed and adapted on 136 test slabs perfomred by previous researchers. The firs

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14

Eppers, Sören. "Assessing the autogenous shrinkage cracking propensity of concrete by means of the restrained ring test." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-65454.

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The autogenous shrinkage due to self-desiccation of high- and ultra-high performance concretes with very low water-cement ratio in case of restraint leads to considerable stresses starting from very early age. The resultant risk of cracking presently cannot be adequately investigated. Parameters that are particularly difficult to capture experimentally are the concrete temperature and the viscoelasticity. The primary objective of this work was to assess as precise as possible the autogenous shrinkage cracking propensity of representative concretes at strong restraint and constant room temperat

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Carlesso, Rodrigo. "Estudo do comportamento mecânico de juntas soldadas de um aço de alta resistência mecânica." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/169810.

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A aplicação de aços de alta resistência está fortemente difundida na indústria mecânica, principalmente em aplicações onde a redução de peso é importante, como por exemplo, a indústria de implementos rodoviários e maquinários agrícolas. Esta dissertação visa analisar a influência de diferentes aportes térmicos no comportamento microestrutural e mecânico de juntas soldadas através do processo MAG de modo a obter juntas com propriedades otimizadas. Para este estudo foram utilizadas chapas metálicas com espessura de 3 mm do aço de alta resistência e baixa liga USI LNE700. Os parâmetros nominais d

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16

Chen, Guodong. "Thermal and Mechanical Behavior of Nano-structured Materials." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1326398846.

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17

Domingos, Cristiane Spolador Pátaro. "Estudo da resistência mecânica do ligamento cruzado anterior de ratos submetidos à imobilização." Universidade de São Paulo, 1998. http://www.teses.usp.br/teses/disponiveis/82/82131/tde-17102017-112127/.

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O efeito da imobilização no ligamento cruzado anterior, através de atadura gessada por um período de 6 semanas, foi estudado em ratos machos, adultos da raça Wistar. Para esta análise foram desenvolvidos dispositivos que permitiram a fixação do espécime à Máquina de Ensaio Universal e a realização de ensaio mecânico de tração. Através desta metodologia a tração foi aplicada na interlinha articular, somente na junção osso-ligamento-osso. Os dados obtidos foram analisados, quanto à carga máxima, deformação máxima, e energia absorvida pelo ligamento até o momento da ruptura. Nos resultados obtido

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18

Dolamune, Kankanamge Nirosha. "Structural behaviour and design of cold-formed steel beams at elevated temperatures." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/33221/1/Nirosha_Dolamune_Kankanamge_Thesis.pdf.

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Cold-formed steel members are extensively used in the building construction industry, especially in residential, commercial and industrial buildings. In recent times, fire safety has become important in structural design due to increased fire damage to properties and loss of lives. However, past research into the fire performance of cold-formed steel members has been limited, and was confined to compression members. Therefore a research project was undertaken to investigate the structural behaviour of compact cold-formed steel lipped channel beams subject to inelastic local buckling and yieldi

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19

Silva, Natalia Vieira da. "Método de determinação de resistência à tração e módulo de elasticidade de partículas de agregados graúdos naturais." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3146/tde-23052018-074920/.

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Esse trabalho tem como objetivo estabelecer um método simples de ensaio que permita determinar a resistência à tração e módulo elástico de partículas individuais de agregados graúdos naturais submetidas à carga de compressão. O método de ensaio foi desenvolvido baseado no ensaio de carga pontual (Point Load Test) que permite obter a resistência à tração de partículas. Para a determinação do módulo de elasticidade foi acoplado ao método um LVDT e foi satisfeita a condição para aplicação da teoria de contato de Hertz (contato curvo-plano entre as partículas e as fixações de aplicação da carga).

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20

Ben, Salem Naoufel. "Fiabilité des assemblages structuraux collés pour applications spatiales." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14681/document.

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Le dimensionnement des joints collés est une préoccupation majeure du CNES pour lesapplications spatiales des futurs lanceurs. Pour dimensionner une structure collée, il est nécessaire depouvoir apprécier les caractéristiques mécaniques du joint collé.Dans cette étude, trois adhésifs structuraux ont été sélectionnés (Hysol®EA 9321, Hysol®EA9394 et Hysol EA® 9395). Après leur caractérisation massique, une étude statistique pour mettre enévidence les effets des différents paramètres (vitesse d’essai, géométrie éprouvette, le degré depolymérisation…) a été entreprise.La deuxième étape a pour obje

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21

Bauer, José Roberto de Oliveira. "Propriedades mecânicas do titânio comercialmente puro e da liga Ti-6Al-4V fundidos em diferentes ambientes." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/23/23140/tde-02012008-153128/.

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Problema: O emprego do titânio e ligas de titânio para aplicações médicas e odontológicas tem aumentado nas últimas décadas, porém, o alto custo do material desestimula o seu uso rotineiro. Objetivos: Avaliar o efeito da pureza do argônio nas propriedades mecânicas, microestrutura e modo de fratura do titânio comercialmente puro (Grau I) e da liga Ti-6Al-4V. Material e Métodos: As fundições para cada liga foram realizadas em uma máquina de indução eletromagnética com um argônio de alta pureza (99,999%) e um argônio conhecido como industrial (99,98%). Os testes de resistência à tração, limite d

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22

Shaheen, Ehab T. "Long Term Performance of Corrugated HDPE Pipes Produced with Post-Consumer Recycled Materials Under Constant Deflection." Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1541422245636659.

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23

Martuci, Ricardo Ruiz. ""Avaliação de cerâmicas odontológicas quanto à resistência de união com a dentina, por ensaio de tração, microdurezas Knoop e Vickers, rugosidade superficial e microscopia de força atômica"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/23/23140/tde-04082006-095610/.

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Foram ensaiadas quatro cerâmicas VMK 95, Omega 900, IPS d. Sign e Cergogold. Os ensaios realizados foram: 1) resistência de união, por ensaio de tração, à dentina humana, de cones (6 x 3 x 5mm) de cerâmica, unidos por meio de cimentos fosfato de zinco, resinosos Rely X e Panávia F (n=10); 2) rugosidade pelos parâmetros Ra, Rt, Ry, Rz e Rp, de superfícies tratadas com ácido fluorídrico a 10% e polidas (n=10); 3) durezas Knoop e Vickers (n=4); 4) análise por microscopia de força atômica de superfícies polidas apenas (n=5). Os dados foram analisados pela análise de variância e testes de Tukey for

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24

Hegron, Lise. "Suivi par émission acoustique de la compaction de particules fragiles d' UO2." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4740/document.

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Une option à l'étude pour le recyclage des actinides mineurs consiste à en incorporer environ 10% à une matrice d'UO2. La présence de pores ouverts interconnectés au sein de ce combustible devrait permettre d'évacuer l'hélium et les gaz de fission pour prévenir le gonflement de la pastille et in fine son interaction avec la gaine qui l'entoure. La mise en oeuvre des actinides mineurs oblige à travailler en cellule blindée, à minimiser leur rétention et à proscrire les ajouts de produits organiques. L'emploi de particules fragmentables de quelques centaines de micromètres paraît une solution in

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Melo, Diego Meneses de. "Estudo de misturas asfálticas com resíduo de construção e demolição oriundo do município de Manaus-AM." Universidade Federal do Amazonas, 2010. http://tede.ufam.edu.br/handle/tede/4299.

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Submitted by Kamila Costa (kamilavasconceloscosta@gmail.com) on 2015-07-07T20:39:11Z No. of bitstreams: 1 Dissertação-Diego Meneses de Melo.pdf: 12978397 bytes, checksum: b2f17a79227222cd6931f419830d812b (MD5)<br>Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2015-07-09T13:36:08Z (GMT) No. of bitstreams: 1 Dissertação-Diego Meneses de Melo.pdf: 12978397 bytes, checksum: b2f17a79227222cd6931f419830d812b (MD5)<br>Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2015-07-09T13:34:01Z (GMT)

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Pokluda, Radim. "Stavební recykláty pro stmelené směsi vozovek." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226040.

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In the theoretical part of the thesis are generally characterized hydraulically bound mixtures, their types, classification systems, manufacturing technology and the laying. There are also described experiences from abroad with the use secondary and recycled materials in hydraulically bound mixtures. The practical part deals with the experimental verification of the possibility of the use of secondary materials in hydraulically bound mixtures in construction of road infrastructure. In road laboratory Institute of road structures Brno university of technology was the five proposed mixtures, an

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27

Kesawan, Sivakumar. "Fire performance and design of light gauge steel frame wall systems made of hollow flange sections." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/120153/1/Kesawan_Sivakumar_Thesis.pdf.

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Load bearing Light Gauge Steel Frame (LSF) wall system is a cold-formed steel structure made of cold-formed steel studs and lined on both sides by gypsum plasterboards. In recent times its use and demand in the building industry has significantly increased due to their advantages such as light weight, acoustic performance, aesthetic quality of finished wall, ease of fabrication and rapid constructability. Fire Resistant Rating (FRR) of these walls is given more attention due to the increasing number and severity of fire related accidents in residential buildings that have caused significant lo

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Clark, Tad Dee. "An Analysis of Microstructure and Corrosion Resistance in Underwater Friction Stir Welded 304L Stainless Steel." Diss., BYU ScholarsArchive, 2005. http://contentdm.lib.byu.edu/ETD/image/etd872.pdf.

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Dai, Feng Jr. "Dynamic Tensile, Flexural and Fracture Tests of Anisotropic Barre Granite." Thesis, 2010. http://hdl.handle.net/1807/26141.

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Granitic rocks usually exhibit strongly anisotropy due to pre-existing microcracks induced by long-term geological loadings. The understanding of anisotropy in mechanical properties of rocks is critical to a variety of rock engineering applications. In this thesis, the anisotropy of tension-related failure parameters involving tensile strength, flexural strength and Mode-I fracture toughness/fracture energy of Barre granite is investigated under a wide range of loading rates. Three sets of dynamic experimental methodologies have been developed using the modified split Hopkinson pressure bar sy

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Zheng, Sheng-Ren, and 鄭勝仁. "Development length of deformed bar in tension for high strength concrete flexural test of beam." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/81347509473793283431.

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KO, HSING-FEI, and 柯星妃. "The Study of Tensile Strength Measurement and Application for Die Pull Test." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/45168273599185332671.

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碩士<br>國立高雄大學<br>電機工程學系--先進電子構裝技術產業研發碩士專班<br>104<br>Usually, mechanized strength test is time consuming and may have errors caused by defects and issues of accuracy. In this thesis a new method of grain tensile strength tests(Die Pull Test) was to verify the strength of the adhesion film in package. If shows that this method can improve the testing time and yield rate of package with grade structure layers. In convention, Die Pull Test may also limited by sample size which is too small to be tested by conventional testing approach. 　　We show that this new method of Die Pull Test is able to impr

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金家輝. "Study on the SPC of Polypropylene Woven Geotextile with Tensile Strength Test." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/55558207003543531782.

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碩士<br>國立嘉義大學<br>土木與水資源工程學系研究所<br>98<br>In this study, the polypropylene (PP) green fabric with the strength about 55kN / m were used as the samples to explore the different test methods for the confidence interval is to control the product quality stability through Shewhart statistical process control (SPC) theroy for evaluating process variation of various test methods. Summarizing the main results in this study are as follows: Width-type, strip-type tensile test methods, whose confidence interval and the average-range control chart shows the same trend, but wide method can show clearly that

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Wu, Meng-Chieh, and 吳孟潔. "Effects Study for the Applicability of Clamps on the Geogrid Tensile Strength Test." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/66918956698061754749.

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碩士<br>中原大學<br>土木工程研究所<br>101<br>Abstract Keywords：Stiff Geogrid、Fiberglass geogrid、Clamps、Single Rib Strength Test、Geogrid Junction Strength 　　In recent years, the application of geogrid on reinforced soil in civil engineering has received global recognition. It is due to the construction of geogrid is simple, low cost, minimum land space is required, earthquake energy absorption, and it can achieve the safety requirement of the economy. Therefore, further research and analyze on geogrid is essential. 　　Geogrid parameters can be obtained through some simple test like single rib strength test a

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Huang, Yu-Hsiu, and 黃于修. "A study on the tensile strength of the plastic injection test pieces after annealing." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/73468131892923716034.

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碩士<br>國立交通大學<br>工學院碩士在職專班精密與自動化工程組<br>97<br>This purpose research is to find out tensile strength of the plastic injection test pieces after annealing. The test pieces are made of PC, POM, PS, and PP materials. The relation of the crystalline micro-structure of the plastics with tensile strength was also studied. Plastics often present internal and residual stress in injection molding. Besides, fountain flow effect and shearing of the molten plastics in the mold change the micro-structure. This experiment is emphasized on the effect of annealing of the injected plastic test pieces. This study

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Lu, Pei-Ying, and 呂佩穎. "Simulation of Artificial Sclerotic Dentin Model for in vitro Micro-tensile Bond Strength Test." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3ykfzu.

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碩士<br>國立臺灣大學<br>臨床牙醫學研究所<br>107<br>The common artificial dentin models used for in vitro adhesive studies can be classified into two categories: the chemical-pH cycling model and the biofilm model. The chemical-pH cycling model executes different pH values to simulate the demineralization and remineralization of caries initiation process. However, it’s a tough work to mimic the real progress of caries, cervical abrasion, abfraction, attrition or erosion. When restoring teeth with these lesions, we always have to face the challenge of sclerotic dentin which was filled with Mg-β-tricalcium phosp

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Chieh, Chin Man, and 秦滿傑. "Combination of Brazilian Test and BEM to determine the elastic constant and tensile strength of anisotropic rocks." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/92441264393395358795.

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碩士<br>國立成功大學<br>資源工程研究所<br>89<br>This study presents a combination of Brazilian test, Boundary Element Method (BEM) and iterative procedure for determining the elastic constants and tensile strength of anisotropic rocks. There are a lot of advantages of the proposed method, such as convenient specimen preparation, simple testing procedure and apparatus, and lower cost. Therefore it has been used to determine the indirect tensile strength of isotropic rocks for a long time. The measurements of strains on the center of Brazilian disc by Chen (1998) and Xiao (2000) were used to be the input of th

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Peng, Cheng-hung, and 彭成宏. "The Test and Research of Various Tensile Strength for The Concrete Coarse Aggregate with The Gravel and The Cobble." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/867z5g.

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碩士<br>國立臺北科技大學<br>土木與防災研究所<br>96<br>The concrete is in the world uses most also most widespread construction builds the material, because the concrete has the outstanding resistant to compression ability and other merits, but the concrete belongs to the brittle material, therefore the tensile strength is low, its tensile strength approximately only has the compressive strength 1,/10, in order to improve the tensile strength of the concrete, usually can place the reinforce in the concrete,increases the tensile strength of the concrete. Other structure of the highways, the runway and so on all a

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Woods, Aaron Paul. "Double-punch test for evaluating the performance of steel fiber-reinforced concrete." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-05-5452.

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The objective of this study is to develop test protocols for comparing the effectiveness of fiber-reinforced concrete (FRC) mixtures with high-performance steel fibers. Steel fibers can be added to fresh concrete to increase the tensile strength, ductility, and durability of concrete structures. In order to quantify steel fiber-reinforced concrete (SFRC) mixtures for field applications, a material test capable of predicting the performance of SFRC for field loading conditions is required. However, current test methods used to evaluate the structural properties of FRC (such as residual strength

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Aderibigbe, Aderonke. "Rock-Fluid Chemistry Impacts on Shale Hydraulic Fracture and Microfracture Growth." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-11129.

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The role of surface chemical effects in hydraulic fracturing of shale is studied using the results of unconfined compression tests and Brazilian tests on Mancos shale- cored at depths of 20-60 ft. The rock mineralogy, total organic carbon and cation exchange capacity were determined in order to characterize the shale. Adsorption tests to study the interaction of the shale and aqueous fluid mixture were also carried out using surface tension measurements. The uniaxial compressive strengths and tensile strengths of individual shale samples after four hours exposure to water, 2.85 x 10^-3 M cati

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Baumgarten, Lars. "Gesteinsmechanische Versuche und petrophysikalische Untersuchungen – Laborergebnisse und numerische Simulationen." Doctoral thesis, 2015. https://tubaf.qucosa.de/id/qucosa%3A23031.

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Dreiaxiale Druckprüfungen können als Einstufenversuche, als Mehrstufenversuche oder als Versuche mit kontinuierlichen Bruchzuständen ausgeführt werden. Bei der Anwendung der Mehrstufentechnik ergeben sich insbesondere Fragestellungen hinsichtlich der richtigen Wahl des Umschaltpunktes und des optimalen Verlaufs des Spannungspfades zwischen den einzelnen Versuchsstufen. Fraglich beim Versuch mit kontinuierlichen Bruchzuständen bleibt, ob im Versuchsverlauf tatsächlich Spannungszustände erfasst werden, welche die Höchstfestigkeit des untersuchten Materials repräsentieren. Die Dissertation greift

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Hasanah, Uswah. "Aggregate coalescence and factors affecting it." 2007. http://hdl.handle.net/2440/45428.

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The phenomenon called soil aggregate coalescence occurs at contact-points between aggregates and causes soil strength to increase to values that can inhibit plant root exploration and thus potential yield. During natural wetting and drying, soil aggregates appear to ‘weld’ together with little or no increase in dry bulk density. The precise reasons for this phenomenon are not understood, but it has been found to occur even in soils comprised entirely of water stable aggregates. Soil aggregate coalescence has not been widely observed and reported in soil science and yet may pose a significant r

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Hasanah, Uswah. "Aggregate coalescence and factors affecting it." Thesis, 2003. http://hdl.handle.net/2440/45428.

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The phenomenon called soil aggregate coalescence occurs at contact-points between aggregates and causes soil strength to increase to values that can inhibit plant root exploration and thus potential yield. During natural wetting and drying, soil aggregates appear to ‘weld’ together with little or no increase in dry bulk density. The precise reasons for this phenomenon are not understood, but it has been found to occur even in soils comprised entirely of water stable aggregates. Soil aggregate coalescence has not been widely observed and reported in soil science and yet may pose a significant

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Eppers, Sören. "Assessing the autogenous shrinkage cracking propensity of concrete by means of the restrained ring test." Doctoral thesis, 2010. https://tud.qucosa.de/id/qucosa%3A25520.

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The autogenous shrinkage due to self-desiccation of high- and ultra-high performance concretes with very low water-cement ratio in case of restraint leads to considerable stresses starting from very early age. The resultant risk of cracking presently cannot be adequately investigated. Parameters that are particularly difficult to capture experimentally are the concrete temperature and the viscoelasticity. The primary objective of this work was to assess as precise as possible the autogenous shrinkage cracking propensity of representative concretes at strong restraint and constant room tempera

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Botelho, José Carlos Castro. "Análise do calor gerado por deformação plástica em aços de alta resistência." Master's thesis, 2018. http://hdl.handle.net/10316/85977.

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Dissertação de Mestrado Integrado em Engenharia Mecânica apresentada à Faculdade de Ciências e Tecnologia<br>Nos últimos anos a utilização dos aços de alta resistência têm vindo a aumentar na indústria automóvel. A elevada resistência mecânica destes aços permite reduzir o peso dos veículos em relação aos aços convencionais. A redução do seu peso permite a diminuição do consumo de combustível, levando a uma diminuição dos impactos ambientais provocados pelos automóveis. Porém a utilização deste tipo de aços impõe novos desafios do ponto de vista tecnológico uma vez que a formabilidade é menor.

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