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Dissertations / Theses on the topic 'Creep'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Djavanroodi, Faramarz. "Creep and creep-fracture crack growth." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47412.

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2

Whitt, Harrison Collin. "Creep and Creep-fatigue Deformation Studies in 22V and P91 Creep-strength EnhancedFerritic Steels." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555603135480185.

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3

Giannopoulos, Ioannis. "Creep and creep-rupture behaviour of Aramid fibres." Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/252181.

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To obtain creep-rupture data at low level within a reasonably short time-scale, two accelerated techniques have been investigated. Stepped Isothermal Method (SIM) testing involves loading a single specimen, under constant load, with the temperature increased in a series of steps to accelerate the creep. Careful choice of the temperature step and step duration allow the test to be completed in about 24 hours. At each temperature step a creep curve is obtained; these are then adjusted to compensate for the different temperature levels and a creep master curve at a reference temperature is produc

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4

Jones, J. P. "Creep and creep fracture of alpha/beta brass." Thesis, Swansea University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637455.

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The uniaxial creep and creep fracture properties of α/β brass in air, have been determined over the stress range 9MPa - 185MPa at 523-673 K, using high precision constant stress creep testing machines. In the majority of cases, normal creep curves were recorded however, under certain conditions, due to the interactions of the two constituent phases some curves exhibited two areas of primary creep. Traditional Power Law analysis was carried out, and was found to be in agreement with published data. An alternative approach, known as the θ Projection Concept accurately described the accumulation

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5

Abdallah, Zakaria. "Creep lifing methods for components under high temperature creep." Thesis, Swansea University, 2010. https://cronfa.swan.ac.uk/Record/cronfa43065.

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6

Hayes, Troy Allyn. "Creep and creep fracture of zirconium and zirconium alloys /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2004. http://wwwlib.umi.com/cr/ucsd/fullcit?p3123657.

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7

Thornton, Gail Marilyn. "Creep behaviour and creep mechanisms of normal and healing ligaments." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0023/NQ49542.pdf.

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8

Pearce, I. "Creep rupture and creep life prediction of aluminium airframe alloys." Thesis, Swansea University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638435.

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Aluminium alloys 2419-T851, 2124-T851 and 7010-T7351 are candidates to succeed the current airframe alloy, RR58. In the present work, high precision constant stress creep curves have been obtained for alloys 2419-T851 and 7010-T7351 over an approximate stress range 100-400MPa at 373-463K. In the case of alloy 2419-T851, the creep curves recorded were predominantly primary in nature, alloy 7010-T7351 exhibited predominantly tertiary curves, while creep curves reported <SUP>(2)</SUP> for 2124-T851 showed an intermediate curve shape. These results have been analysed to allow comparisons to be mad

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9

Ward, A. R. "Creep and creep fracture of alpha + beta titanium alloy 6.2.4.6." Thesis, Swansea University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.639344.

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High precision uniaxial constant stress creep tests were carried out at 773K for the α+β titanium alloy Ti 6.2.4.6. Repeat data at 580 MPa provided a unique opportunity to identify stochastic creep properties and to use this information to build a probabilistic creep damage assessment for this alloy. The stochastic nature of creep properties both at a single test condition (using a generalised gamma distribution) and at various test conditions (by combining this distribution with the Monkman - Grant relation) was identified. In addition, the theta prediction methodology was extended so that li

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10

Girdwood, R. B. "Creep and creep recovery of the nickel-base superalloy Nimonic 105." Thesis, Swansea University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637059.

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Uniaxial constant stress creep tests have been performed on the wrought nickel-base superalloy Nimonic 105 at 1098, 1123, 1148, 1173 and 1198K over the stress range 50-450MPa. Entire creep curves were recorded and creep curve shapes analysed. Rejuvenative procedures were applied to pre-crept samples and creep recovery quantitatively assessed.

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11

Hull, R. J. "Creep and creep fracture of the near-alpha titanium alloy IMI834." Thesis, Swansea University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637341.

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High precision uniaxial constant stress tests were carried out for the near-alpha titanium alloy IMI834. Testing was completed at 823, 848, 873, 898 and 923 K, and at stresses chosen to give rupture lives in the range of about one day to six months at each temperature. Over the entire range of testing conditions, predominantly tertiary normal creep curves were recorded. During creep an alpha-case developed at air exposed surfaces, whose depth varied according to a parabolic rate law with an activation energy of 208 kJmol<SUP>-1</SUP>. For tests failing after about 1000 hours at 848, 873 and 89

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12

Stewart, Calvin. "A Hybrid Constitutive Model For Creep, Fatigue, And Creep-Fatigue Damage." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6023.

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In the combustion zone of industrial- and aero- gas turbines, thermomechanical fatigue (TMF) is the dominant damage mechanism. Thermomechanical fatigue is a coupling of independent creep, fatigue, and oxidation damage mechanisms that interact and accelerate microstructural degradation. A mixture of intergranular cracking due to creep, transgranular cracking due to fatigue, and surface embrittlement due to oxidation is often observed in gas turbine components removed from service. The current maintenance scheme for gas turbines is to remove components from service when any criteria (elongation,

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13

Lieu, T. D. "Creep and creep fracture of MA 957 oxide dispersion-strengthened ferritic steel." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637910.

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The creep and creep fatigue properties of a 14% Cr ferritic steel (MA 957) strengthened with a dispersion of Y<SUB>2</SUB>O<SUB>3</SUB> particles have been determined using high precision constant stress creep machines. Creep testing was carried out under tension over a stress range of 250 to 420 MPa at 873 to 973K. In addition, compression creep tests were also performed over a stress range of 250 to 320 MPa at 948K. Normal creep curves were observed under all tensile conditions, i.e. after the initial strain on loading, the strain rate decreased to an apparently steady state before the onset

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14

Havel, Frantisek. "Creep in soft Soils." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-297.

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<p>As more and more constructions are concentrated in densely populated urban areas, there is an increasing need to construct buildings and geotechnical structures on soft clay materials, which usually produce significant creep deformation. Although a lot of research work has been related to the creep behaviour of a natural clay material, there are still many questions about this phenomenon. Even today, prediction of the time dependent deformation is generally very problematic. Detailed laboratory, in-situ and numerical studies of soft soil creep are necessary for the better understanding and

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15

Feng, Gang, and 封剛. "Creep effects in nanoindentation." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31224350.

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16

Resen, Abdul-Amir S. "Biaxial creep of plastics." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.256753.

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17

Liu, Qida. "Electromechanical creep in ferroelectrics." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613330.

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18

Feng, Gang. "Creep effects in nanoindentation." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23273288.

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19

Yu, Chi-Wen. "Creep characteristics of soft rock and modelling of creep in tunnel : determination of creep characteristics of soft rock and development of non-linear creep analysis code for squeezing tunnel problem." Thesis, University of Bradford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.586717.

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Squeezing or time-dependent creep deformation of rock has been encountered frequently in tunnels. It is particularly common in tunnels excavated in very soft rock or heavily fractured rock under significant in-situ stresses. In Taiwan, due to the inferior geological setting and the young sedimentary rock formations, squeezing in tunnels was found to be a very common problem from the recent case histories of some large span road tunnels. This research reviewed the existing rock creep models, and an adequate creep model for representing the creep behaviour of soft rock or a weak rock mass in gen

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20

Palmer, C. J. "High temperature creep of copper." Thesis, Swansea University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638403.

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The key observations that have underpinned traditional power law approaches to creep mechanism identification have been re-evaluated using information obtained for pure copper and aluminium, and also for various other metals and alloys. Specifically, data is presented which show stress/creep rate plots for copper and aluminium over extended stress ranges to be well represented by continuous curves, contradicting the common assumption that a transition in mechanisms occurs as the stress is reduced. Data is also presented from a series of stress interruption tests on pure copper, with strain/str

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21

Wang, D. "Creep of 316 stainless steel." Thesis, Swansea University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.639338.

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Constant stress creep tests were carried out for 316 stainless steel at 550, 600, 650 and 700<SUP>o</SUP>C over the stress range of 125 - 500 MPa. Entire creep curves were recorded by computer and creep curve shapes analysed. Within the stress and temperature range of the test matrix, creep curve shapes vary from tertiary dominant at low stress and temperature, to primary dominant at high temperature and mixed type at intermediate temperatures. Traditional parametric methods such as Larson-Miller, Orr-Dorn-Sherby and Manson-Succop methods were applied for the analysis of creep rupture life. Th

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22

Sun, Wei. "Creep of service-aged welds." Thesis, University of Nottingham, 1996. http://eprints.nottingham.ac.uk/11727/.

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The creep behaviour of welds in service-aged pipes are studied. The aims of the research have been achieved using analytical, numerical and experimental approaches to the relevant subjects. Several features of the work are presented: (i) a systematic parametric study of the creep of two-material test specimens including a stress singularity analysis, (ii) an impression creep testing method using a rectangular indenter, which can be applied to study the creep properties in welds, and (iii) methods used for damage constitutive equation generation involving FE-damage modelling of the rupture test

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23

Rayner, Glen. "Creep of welded branched pipes." Thesis, University of Nottingham, 2004. http://eprints.nottingham.ac.uk/11660/.

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Creep failure of welds in high-temperature power plant steam piping systems is known to be a potential cause of plant failure. Creep behaviour of plain pipes with circumferential welds and cross-weld specimens have received fairly extensive attention. However, research into the creep behaviour of welded thick-walled branched steam pipes has received less attention. Consequently, this thesis addresses improving the understanding of the creep behaviour for this type of geometry. Numerical and analytical methods are used to assess the creep behaviour of typical power plant branched pipe geometrie

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24

Ling, Paul Keh Yiing. "Creep of metal matrix composites." Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240496.

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25

Kwok, Chung Yee. "Micromechanical modelling of soil creep." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611185.

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26

De, Voy Julian David James. "Failure of creep brittle materials." Thesis, University of Leicester, 1993. http://hdl.handle.net/2381/34757.

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27

Maraboli, Contardo Luis Robinson. "Creep de aleaciones cobre molibdeno." Tesis, Universidad de Chile, 2015. http://repositorio.uchile.cl/handle/2250/132918.

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Ingeniero Civil Mecánico<br>Esta memoria consiste en una investigación en la cual se busca mejorar las propiedades mecánicas del cobre, incorporando una dispersión nanométrica de cerámicos in-situ, mediante molienda reactiva, los cuales dificultan el movimiento de dislocaciones y límites de grano. Este trabajo tiene por objetivo fabricar aleaciones con dispersión de carburos de molibdeno (específicamente Cu - 0%v Mo2C, Cu - 2,5%v Mo2C y Cu - 5%v Mo2C) y determinar cómo afecta esta composición en la compresión en caliente y creep. Se realizaron moliendas reactivas de 100 y 150 horas, a partir

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28

Couto, Marcelo Guerino Pereira. "'Creep' em resinas compostas fotopolimerizáveis." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/25/25131/tde-11032005-110757/.

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As resinas compostas vêm sofrendo inúmeras alterações com o objetivo de tornar o seu uso adequado para restaurações de dentes posteriores, entretanto, problemas clínicos associados à sua utilização são comumente observados, dentre eles sua resistência ao desgaste e à abrasão, a contração de polimerização, a microinfiltrção marginal, e sua deformação permanente (importante propriedade em situações clínicas onde existem áreas sujeitas às forças oclusais) e esta, normalmente não é considerada. Visando determinar o creep, por meio da deformação permanente, amostras confeccionadas com resinas com

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29

Sieburg, H. O. "Creep predictions for turbomachinery components." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/18697.

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Several theories of creep and creep rupture are reviewed. Specific attention is devoted to the brittle damage theory proposed by Kachanov. Creep, damage and life predictions for rectangular or circular cross section beams under bending and tensile loads are presented. Comparison with data for a Ni Superalloy showed life predictions could be 30X in excess of experimental values. This beam model also revealed that it is imperative that no bending moments be inadvertently applied during tensile creep testing. The creep-damage material model is extended to multidimensional situations. A refinement

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30

DeMaio, Andrew Marc. "The Role of Bonding on the Tensile Creep Behavior of Paper." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/16329.

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The role of bonding in the tensile creep behavior of paper was analyzed. This was accomplished by producing handsheets at a range of different bonding levels through manipulation of relative bonded area and specific bond strength. This was done by varying the level of wet pressing (to change relative bonded area) and using debonding and bonding agents (to change specific bond strength). Once manufactured, sheets underwent an extensive battery of physical testing and creep testing. Creep testing was conducted under constant humidity and cyclic humidity (accelerated creep) conditions. Microscopi

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31

Larsson, Jonas. "Evaluation of current methods for creep analysis and impression creep testing of power plant steels." Thesis, KTH, Materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104603.

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Destructive testing of creep exposed components is a powerful tool for evaluation of remaining lifetime of high temperature pipe systems. The most common destructive evaluation method used today is uniaxial creep testing. Uniaxial creep tests can produce accurate creep curves but the test method has some drawbacks such as costliness and long testing times. It also demands large sample material outtake which often involve weld repair. Impression creep (IC) testing is a relatively new alternative test method for evaluating primary and secondary creep rates. The scope of this work is to evaluate

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32

Stracey, Muhammad Ghalib. "Continuum Damage Mechanics (CDM) modelling of dislocation creep in 9-12% Cr creep resistant steels." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/22994.

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The generation of electricity to meet an ever-growing demand has become a defining characteristic of the modern world for both developed and developing nations alike. This, coupled with the intensifying concern with pollution and its effects on the environment has put immense pressure on how quickly and efficiently power is produced. Being the most prevalent source of electricity generation, coal fired power plants have been subject to increasing scrutiny and study in an effort to improve the efficiency at which they operate. Hence, coal fired power plants are being run at increased temperatur

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33

Chang, Yeou Shin. "The effect of the interphase/interface region on creep and creep rupture of thermoplastic composites." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-06062008-170854/.

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34

Neuhofer, Erik Joachim, and af Rolén Samuel Zelenka. "The Feature Creep Perception in Game Development : Exploring the role of feature creep in development methods and employee engagement." Thesis, Södertörns högskola, Medieteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-44946.

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Game developers often find themselves coming up with ideas along the production period of a game varying in size and may go unnoticed or seem insignificant to the scope of the project but in the long run add up to break deadlines, budget and affect the morale and engagement of developers. In the modern game development industry agile development methods have increased in popularity allowing flexibility in the development process. This agile approach has emerged from traditional software development where waterfall development methods are common practice (Kanode and Haddad, 2009). Through in-de

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35

Chakravarty, Sanjay. "DEVELOPMENT OF CREEP TESTER AND TO INVESTIGATE THE EFFECT OF CATIONIC STARCH ON TENSILE CREEP ON SOFTWOOD BLEACHED KRAFT HANDSHEETS AT CONSTANT HUMIDITY." Miami University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=miami1143250391.

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36

Saber, Mohammed. "Experimental and finite element studies of creep and creep crack growth in P91 and P92 weldments." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/12197/.

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P91 and P92 steels are two ASTM grades of steel which have been used in high temperature applications, such as fossil-fuelled power stations, nuclear power stations and chemical plants. Operating under creep conditions, i.e. high temperature and/or high stress, the welds made from these steels are potential failure locations and, therefore, life limiting for the entire plant. In this thesis, the results of creep and creep crack growth (CCG) tests, which were carried out on P91 and P92 welds, are reported. These tests were carried out on welds constituents, i.e. parent materials (PM) and weld m

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37

Zhang, Ruomeng. "Evaluation of Current Concrete Creep Prediction Models." University of Toledo / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1461963600.

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38

Li, Han. "The nanoindentation size effects of creep." Click to view the E-thesis via HKUTO, 2004. http://sunzi.lib.hku.hk/hkuto/record/B30696380.

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39

Segle, Peter. "Numerical simulation of weldment creep response." Doctoral thesis, KTH, Materials Science and Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3359.

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<p>In-service inspections of high temperature pressureequipment show that weldments are prone to creep and fatiguedamage. It is not uncommon that severely damaged weldments arefound even before the design life of the component has beenreached. In order to improve this situation action has beentaken during the last decades, both from industry, universitiesand research institutes, aiming at an enhanced understanding ofthe weldment response.</p><p>The work presented in this thesis focuses on numericalsimulation of weldment creep response. For a more profoundunderstanding of the evolution of creep

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40

Magnusson, Hans. "Creep modelling of particle strengthened steels." Doctoral thesis, KTH, Materialteknologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12235.

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Materials used in thermal power plants have to resist creep deformation for time periods up to 30 years. Material evaluation is typically based on creep testing with a maximum duration of a few years. This information is used as input when empirically deriving models for creep. These kinds of models are of limited use when considering service conditions or compositions different from those in the experiments. In order to provide a more general model for creep, the mechanisms that give creep strength have to be identified and fundamentally described. By combining tools for thermodynamic modelli

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41

Olagne, Xavier. "An engineering model for snow creep." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/27609.

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Snowcovers on slopes densify and deform continuously throughout the winter. These slow, mainly viscous deformations are known as snow creep and this thesis presents an attempt to model them by idealizing snow as a non-Newtonian fluid, where the bulk and shear viscosities depend upon both stress and density. A three-dimensional constitutive law is developed, based largely on analogy with the flow behavior of ice and soil materials. The model, primarily intended for engineering applications (design of structures erected in a deep snowpack), is tested for creep pressures on long rigid obstacles.

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42

Van, Steenis Karen Anne. "Modelling creep deformation in floating ice." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60509.pdf.

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43

Magnusson, Hans. "Creep modelling of particle strengthened steels." Licentiate thesis, Stockholm : Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4436.

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44

Kavanaugh, Bryan Palmer Schindler Anton K. "Creep behavior of self-consolidating concrete." Auburn, Ala, 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SUMMER/Civil_Engineering/Thesis/Kavanaugh_Bryan_38.pdf.

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45

Chang, Feng-Cheng. "Creep behaviour of wood-plastic composites." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/38210.

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In this research, a series of experiments have been conducted, including mountain pine beetle attacked wood/plastic composite (MPB-WPC) prototype product development, dynamic mechanical analysis (DMA), short-term creep tests for master curve construction based on the time-temperature-stress superposition principle (TTSSP), and a long-term creep test. Moreover, a newly established stress-temperature incorporated creep (STIC) model, a modified Williams-Landel-Ferry (WLF) equation that incorporates the variables of temperature and stress, and a newly developed temperature-induced strain superposi

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46

Lee, One-Chul. "Creep phenomenon of fiber reinforced plastics." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/21003.

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47

Danks, J. "Cyclic creep of T316 stainless steel." Thesis, Coventry University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328644.

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48

Stoyanov, Miroslav. "Investigation of small punch creep testing." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/28105/.

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Assessing the damage level of in-service components and obtaining material properties for welded structures exposed to creep is essential for the safe operating of power generation industry. Standard creep testing techniques require relatively large volumes of material for the machining of testing samples. For that reason they are not usually suitable for obtaining creep properties of in-service structures. It has been found that significant amount of the failures in welds exposed to elevated temperatures occur in an area formed due to the complex thermal and cooling cycles during the welding

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49

Jiang, H. "Tensile creep of sintered silicon carbide." Thesis, Swansea University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637429.

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Pressureless sintered silicon carbide is currently being evaluated for advanced aeroengine applications because it provides the best combination of strength retention and oxidation resistance at high temperatures. In the present work, tensile creep and creep fracture behaviour of sintered SiC has been investigated. Creep tests have been performed under constant stress and temperature ranges from 125 to 400 MPa and 1673 to 1873 K respectively. The sintered SiC exhibits primary dominated creep curves and little or no tertiary stage in all cases studied. It is established that the SiC displays a

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50

Li, Han, and 李晗. "The nanoindentation size effects of creep." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B30696380.

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