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Dissertations / Theses on the topic 'Compressive creep'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Vincent, Edward Creed. "Compressive Creep of a Lightweight, High Strength Concrete Mixture." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/30962.

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Concrete undergoes volumetric changes throughout its service life. These changes are a result of applied loads and shrinkage. Applied loads result in an instantaneous recoverable elastic deformation and a slow, time dependent, inelastic deformation called creep. Creep without moisture loss is referred to as basic creep and with moisture loss is referred to as drying creep. Shrinkage is the combination of autogeneous, drying, and carbonation shrinkage. The combination of creep, shrinkage, and elastic deformation is referred to as total strain. The prestressed concrete beams in the Chickah

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2

Atrushi, Dawood Soliman. "Tensile and Compressive Creep of Young Concrete : Testing and Modelling." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18.

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<p>The thesis deals with experimental and numerical modelling to characterize early age tensile and compressive creep and its associated stress relaxation - which are very important properties in stress simulation of early age concrete. For this purpose a comprehensive work was carried out involving construction of a new tensile creep test equipment and development of test procedures to generate basic experimental data.</p><p>The experimental program is subdivided into four series. Each of the series involves one varying parameter, which is relevant to the time-dependent behaviour of early age

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3

Meyerson, Richard. "Compressive Creep of Prestressed Concrete Mixtures With and Without Mineral Admixtures." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/31525.

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Concrete experiences volume changes throughout its service life. When loaded, concrete experiences an instantaneous recoverable elastic deformation and a slow inelastic deformation called creep. Creep of concrete is composed of two components, basic creep, or deformation under load without moisture loss and drying creep, or deformation under drying conditions only. Deformation of concrete in the absence of applied load is often called shrinkage. The deformation due to creep is attributed to the movement of water between the different phases of the concrete. When an external load is appl

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4

Sahota, Mankinder Kaur. "The use of lead in infilled frame structures to reduce vertical load transfer." Thesis, University of Sussex, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321489.

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5

Anwar, Muhammad. "The compressive creep and load relaxation properties of a series of high aluminium zinc-based alloys." Thesis, Aston University, 1997. http://publications.aston.ac.uk/13271/.

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A new family of commercial zinc alloys designated as ZA8, ZA12, and ZA27 and high damping capacity alloys including Cosmal and Supercosmal and aluminium alloy LM25 were investigated for compressive creep and load relaxation behaviour under a series of temperatures and stresses. A compressive creep machine was designed to test the sand cast hollow cylindrical test specimens of these alloys. For each compressive creep experiment the variation of creep strain was presented in the form of graphs plotted as percentage of creep strain () versus time in seconds (s). In all cases, the curves showed th

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6

Vorakunpinij, Adisak. "The effect of paper structure on the deviation between tensile and compressive responses." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/7058.

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7

Bond, Brian H. "Development of tension and compression creep models for wood using the time-temperature superposition principle." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-10312009-020305/.

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8

Boyd, Steven Earl. "Compression Creep Rupture of an E-glass/Vinyl Ester Composite Subjected to Combined Mechanical and Fire Loading Conditions." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/29896.

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Polymer matrix composites are seeing increasing use in structural systems (e.g. ships, bridges) and require a quantitative basis for describing their performance under combined mechanical load and fire. Although much work has been performed to characterize the flammability, fire resistance and toxicity of these composite systems, an understanding of the structural response of sandwich type structures and laminate panels under combined mechanical and thermal loads (simulating fire conditions) is still largely unavailable. Therefore a research effort to develop a model to describe the structural

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9

Smith, Kevin Jackson. "Compression creep of a pultruded E-glass/polyester composite at elevated service temperatures." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7195.

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This thesis presents the results of an experimental investigation into the behavior of a pultruded E-glass/polyester fiber reinforced polymer (FRP) composite under sustained loads at elevated temperatures in the range of those that might be seen in service. This investigation involved compression creep tests of material coupons performed at a constant stress level of 33% of ultimate strength and three temperatures levels; 23.3°C (74°F), 37.7°F (100°F), and 54.4°C (130°F). The results of these experiments were used in conjunction with the Findley power law and the Time- Temperature Superpositio

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10

Ventakesh, T. A. 1970. "Reactive infiltration processing and compression creep of NiAl and NiAl composites." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50458.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1998.<br>Includes bibliographical references (p. 116-118).<br>Reactive infiltration processing of bulk and composite NiAl was investigated with powder and wire preforms of nickel. Inhomogeneous microstructures were often obtained with powder preforms because their high surface-to-volume ratio, low permeability, and irregular infiltration paths lead to simultaneous infiltration and reaction. Homogenous NiAl could be obtained with nickel-wire preforms which had a lower surface-to-volume ratio, high

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11

Kosoglu, Laura Marie. "Modeling Macro-scale Clay Behavior at Micro-scale Clay Particle Interfaces." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77350.

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Clay consolidation has generally been considered from a macro-scale perspective by measuring the macro-scale compression of a clay soil over time. Clay particles in consolidation tests experience shear and normal forces at the inter-particle level due to force applied to the soil at the macro-scale. These shear and normal forces cause the particles to slide at the micro-scale and produce macro-scale changes in soil volume and shape. By considering the inter-particle interactions at the micro-scale, the shear force - normal force - velocity relationship can be described by the Rate Process Theo

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12

Mohammadi, Yaghoub. "Compression creep measurements in pultruded angle sections made of fibre glass reinforced plastic." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69738.

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A study aimed at investigating the performance of pultruded fibre glass reinforced plastic (FGRP) materials subjected to both the time-independent and the time-dependent response of angle stubs and coupons was conducted. Angle stubs and coupons were made of isophtalic polyester resin reinforced with an E-glass fibre glass mat of 35%-45% of the weight. The stub dimensions were of 50.8 mm $ times$ 50.8 mm $ times$ 6.35 mm and their length was 305 mm. The compression coupons were cut in a prismatic shape according to ASTM Standard D695-89 with 12.70 mm $ times$ 6.35 mm cross-section and a length

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13

Shambira, Mandizvidza Valentine. "An experimental and numerical study of shrinkage and creep in axially-loaded patch-repaired reinforced concrete short columns." Thesis, University of the West of England, Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297893.

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Patch repairs are sometimes considered to be capable of contributing to the resisting of externally applied load when the repairs are applied to deteriorated concrete structural members, particularly when the repair is subj ected to compression. However, it is generally known that many patch repair materials shrink and creep significantly relative to the concrete substrate. This thesis presents an experimental and numerical study of the contribution of patch repairs to load carrying in reinforced concrete columns, its quantification and the effect of shrinkage and creep. Twelve reinforced conc

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14

Brandes, Matt C. "Creep, Fatigue, And Deformation Of Alpha And Alpha-Beta Titanium Alloys At Ambient Temperature." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1221848896.

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15

Wikby, Pierre, and Ragnar Andersson. "Stochastic Settlement Model Including Creep Effects : Simulation of Groundwater Induced Subsidence." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279528.

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When underground openings are constructed, groundwater inflow can occur, which might lead to ground settlements, namely in clay. In these types of construction projects, it is beneficial to be able to quantify risks related to these settlements. A framework developed by Sundell et al. (2019, Risk Analysis, Vol. 39, 105-124) deals with this, in which one part is a statistical settlement model. However, since their model only considers primary compression, a model that accounts for secondary compression (or creep) is necessary to better represent real conditions.In this thesis, an adaptation of

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16

Ajuong, Elijah M. A. "The influence of extractives on short-term creep in compression parallel to grain of pai (Afzelia africana Smith) wood." Thesis, Bangor University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239894.

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17

Hilaire, Adrien. "Etude des déformations différées des bétons en compression et en traction, du jeune au long terme : application aux enceintes de confinement." Thesis, Cachan, Ecole normale supérieure, 2014. http://www.theses.fr/2014DENS0048/document.

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Ce travail a pour but d'apporter des éléments de connaissance sur le comportement des enceintes de confinement des centrales nucléaires françaises. L'aptitude au confinement de ce type de structures est garantie par la faible perméabilité du béton. En cas d'accident, le béton est protégé de la fissuration par la compression biaxiale assurée par les câbles de précontrainte orthoradiaux et verticaux. Dès lors, il s'agit de vérifier deux points principaux : premièrement, le niveau de précontrainte doit rester suffisamment élevé pour équilibrer les contraintes de traction induites lors d'un accide

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18

Katicha, Samer. "Analysis of Hot Mix Asphalt (HMA) Linear Viscoelastic and Bimodular Properties Using Uniaxial Compression and Indirect Tension (IDT) Tests." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/30036.

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The major Hot-Mix Asphalt (HMA) input for mechanistic-empirical (M-E) flexible pavement design is the dynamic complex modulus obtained from either the uniaxial or triaxial compressive dynamic modulus test. Furthermore, as part of the performance-based mix design process, the triaxial dynamic modulus has been selected to predict rutting and fatigue cracking, and the Indirect Tension (IDT) creep compliance test to predict low-temperature thermal cracking. The creep compliance and dynamic modulus are measured responses (viscoelastic functions) of viscoelastic materials under transient and cycli

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19

Tchekiken, Chahinez. "Modélisation et simulations numériques d’écoulements compressibles dans des micro-conduites planes." Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1109/document.

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En raison du développement croissant des MEMS (Micro Electro Mechanical Systems), l'étude des écoulements de liquide ou de gaz et des transferts thermiques dans des conduites, chauffées ou non, dont le diamètre hydraulique est de l'ordre de quelques microns, a suscité un nombre considérable de travaux au cours des vingt dernières années. À cette échelle, le nombre de Knudsen peut être important (Kn>0,01), ce qui donne naissance à des phénomènes de glissement, de saut de température et de pompage thermique qui s'ajoutent aux effets de compressibilité, telles que la puissance due aux forces d

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20

Plé, Olivier. "Contribution à l'étude de l'endommagement de la glace columnaire S2 en compression uniaxiale." Université Joseph Fourier (Grenoble ; 1971-2015), 1998. http://www.theses.fr/1998GRE10014.

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Ce travail est centre sur l'etude de la nucleation de fissures dans la glace. Une partie importante de l'etude a ete consacree a la mise au point d'une glace artificielle qui fournit un materiau bidimensionnel ideal pour un couplage d'etudes experimentales et theoriques. Notre demarche a consiste a conduire une serie d'experiences de fluage sur ce type de materiau et sur le type de glace couramment utilise par la communaute des glaciologues. Selon le niveau de contrainte (entre 0,5 et 1 mpa) le fluage de la glace etait accompagne ou non par de l'endommagement. La partie la plus originale de l'

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21

Nanetti, Marco. "Experimental Study on Friction between Saline Ice and Steel." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amslaurea.unibo.it/57/.

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Understanding the interaction of sea ice with offshore structures is of primary importance for the development of technology in cold climate regions. The rheological properties of sea ice (strength, creep, viscosity) as well as the roughness of the contact surface are the main factors influencing the type of interaction with a structure. A device was developed and designed and small scale laboratory experiments were carried out to study sea ice frictional interaction with steel material by means of a uniaxial compression rig. Sea-ice was artificially grown between a stainless steel piston (o

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22

Bartulíková, Radka. "Vliv provzdušnění a ošetřování na vývoj modulu pružnosti betonu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225737.

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Master's thesis deals with influence of various factors on the concrete compressive strength and modulus of elasticity. This work concentrates mainly on the influence of early curing and air entrainment of concrete. One part of this work is the evaluation of laboratory measurement, which was carried out on cubes of standard and norm prisms. The development of elastic moduli was monitored in time to 730 days of age with respect to air entrainment and curing conditions. The second part of the experiment deals with a comparison of theoretical creep curves depending on the value of the modulus of

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23

Salvo, Maxime. "Etude expérimentale et modélisation du comportement mécanique du combustible UO2 en compression à haute température et forte vitesse de sollicitation." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4771/document.

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L'objectif de ce travail est de caractériser et de modéliser le comportement mécanique des oxydes d'uranium (UO2) en situation d'Accident d'Injection de Réactivité (RIA). Les sollicitations vues par le combustible durant un RIA sont caractérisées par de fortes vitesses de déformation (jusqu'à 1/s) et de fortes températures (1000-2500°C). Deux lots de pastilles d'UO2 (de type industriel et à forte densité) ont donc fait l'objet d'une campagne d'essais de compression à vitesses de déplacements imposées (0,1-100 mm/min auxquelles correspondent des vitesses de déformations de 10−4-10−1/s) et à tem

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24

Vorobyev, Alexey. "Static and time-dependent mechanical behaviour of preserved archaeological wood : Case studies of the seventeenth century warship Vasa." Doctoral thesis, Uppsala universitet, Tillämpad mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-314266.

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Wooden objects have been widely used in the history of humanity and play an important role in our cultural heritage. The preservation of such objects is of great importance and can be a challenging task. This thesis investigates the static and time-dependent mechanical behaviour of archaeological oak wood from the Vasa warship. Characterisation of mechanical properties is necessary for the formulation of a numerical model to design an improved support structure. The ship was impregnated with polyethylene glycol (PEG) for dimensional stabilisation. All elastic engineering constants of the Vasa

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25

Li, Yongqiang. "Experimental Studies on the Mechanical Durability of Proton Exchange Membranes." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/29944.

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Three testing methods are proposed to characterize properties of fuel cell materials that affect the mechanical durability of proton exchange membranes (PEMs). The first two methods involved measuring the in-plane biaxial strength of PEMs and the biaxial hygrothermal stresses that occur in PEMs during hygrothermal cycles. The third method investigated the nonuniform thickness and compressibility of gas diffusion media which can lead to concentrated compressive stresses in the PEM in the through-plane direction. Fatigue and creep to leak tests using multi-cell pressure-loaded blister fixtur

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26

Kaligora, Koffi. "Caractérisation du comportement mécanique des oxydes sous stoechiometriques sous températures et atmosphères controlées." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2062.

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Cette thèse porte sur le développement d’un moyen d’essai mécanique permettant de caractériser l’effet de la pression partielle d’oxygène sur le comportement mécanique des oxydes sous-stoechiométriques de type pérovskite utilisé pour leur propriété de semi-perméation. Pour étudier ces matériaux, un nouveau protocole expérimental a été développé, ainsi qu’une méthode numérique de dépouillement ad hoc. Les essais de compression diamétrale cyclique et fluage par compression diamétrale mis en place sont réalisés dans un four d’essais mécaniques à étanchéité renforcée permettant de maitriser l’atmo

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27

Gentili, Luigi. "Scarti industriali e da demolizione per la realizzazione di calcestruzzi sostenibili." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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Lo studio sperimentale, descritto nella presente tesi ha come scopo l’utilizzo di scarti di produzione o materiali considerati eco-friendly, all’interno del calcestruzzo. L’attività condotta si inserisce all’interno di un progetto della regione Emilia Romagna, Mater_Sos, che ha tra gli obiettivi lo scopo di sviluppare e prototipare materiali da costruzione a basso impatto ambientale. Il calcestruzzo in Italia è uno dei materiali più utilizzati nell’edilizia, ma il meno sostenibile. Per la sua produzione vengono impiegate elevate quantità di risorse naturali non rinnovabili con un notevole imp

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28

Lin, Chun-Chi, and 林俊吉. "Development of Compressive Creep Model for Lead-Free Ball Grid Array Solder Joints." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/63295716271168207771.

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碩士<br>國立成功大學<br>機械工程學系碩博士班<br>97<br>Heat sinks with fans are typically used for thermal management in state-of-the-art electronic systems for computing or telecommunication. For the purpose of improving the efficiency of heat conduction, a compressive load is usually applied to the assembly of heat sink and the electronic component. For electronic components with ball grid array (BGA) solder joints the compressive load would cause solder joint creep collapse and bridging, which in turn would lead to electrical short failure. In order to predict the BGA solder joint reliability under extended h

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29

Araújo, Carlos Alexandre Fernandes. "Fluência no betão desde as primeiras idades: um estudo experimental." Master's thesis, 2015. http://hdl.handle.net/1822/40698.

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Dissertação de mestrado integrado em Engenharia Civil<br>As propriedades viscoelásticas do betão, como a fluência e a relaxação desempenham relevantes papéis na distribuição das tensões internas e no potencial de fissuração das estruturas de betão durante as primeiras idades. A bibliografia disponível acerca da fluência no betão nas primeiras idades é bastante limitada no comportamento em compressão. Esta limitação prende-se com a dificuldade da realização dos ensaios à tração com materiais à base de cimento, que é particularmente mais difícil durante as primeiras idades enquanto o mater

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30

Tyagi, Sanjeev R. "Creep of Gr/BMI composite laminates in compression." Thesis, 1994. http://hdl.handle.net/1957/35897.

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The main source of the time-dependent behavior of fiber-reinforced composites is their polymeric matrix, which causes concerns about their long term durability. Although for composites where organic fibers such as Graphite are used, the fibers are also a contributing factor. A composite material may exhibit an appreciable amount of creep, depending on the state of stress and temperature. Viscoelastic flow in the matrix and internal flaw formation and growth are the main sources of this creep. Thus a study was made on the viscoelastic behavior of GI/BMI fiber reinforced composite. An experiment

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31

Braga, Hélder Rui da Silva. "Nova ponte sobre a foz do rio Dão: desenvolvimento de um sistema de monitorização contínua e avaliação do betão em termos de características mecânicas instantâneas e efeitos diferidos." Master's thesis, 2014. http://hdl.handle.net/1822/36239.

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Dissertação de mestrado integrado em Engenharia Civil<br>Em geral a monitorização estrutural tem como objetivo fundamental a deteção do dano, que pode incluir alterações ao nível da geometria e materiais, que possam afetar o desempenho estrutural. Trata-se do processo mais adequado para a avaliação da performance a longo prazo, resultante da degradação da estrutura no tempo. Adicionalmente, no caso de eventos extremos (e.g. sismos, explosões, incêndios, etc.), permite avaliar de forma expedita e imediata, a integridade da estrutura. Finalmente, constitui uma ferramenta importante no auxí

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32

Wu, Jyh-Horng, and 吳志宏. "Nonlinear Viscoelastic Analysis of Creep Responses for Antisymmetric Angle-Ply Laminates Under Compression." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/63765048208656474337.

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碩士<br>國立海洋大學<br>航運技術研究所<br>84<br>ABSTRACTThe creep responses of regular, angle-ply fiber- reinforced plastics (FRP) laminates, having various magnitudes of imperfections, are investigated in this study. The laminates under consideration are simply supported and subjected to compression. The analysis is based on the nonlinear viscoelastic theory. The stress function is obtained from the compatibility equation by the use of Laplace transform. The moment equilibrium equation is approximately s

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33

GiaBao, Dinh, and 丁迦堡. "NUMERICAL STUDIES OF CREEP BEHAVIOR OF CONCRETE-FILLED STEELTUBULAR COLUMNS UNDER COMPRESSION AT HIGH TEMPERATURES." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/90507329029590313002.

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Pavlová, Martina. "Sekundární stlačitelnost brněnského téglu." Master's thesis, 2014. http://www.nusl.cz/ntk/nusl-341345.

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Observation and measurement of long-term volumetric deformation of clay are important in tackling different geotechnical and geological issues. The area of interest is the northern part of Vienna Basin, where Miocene clays sedimented. It is locally known as Brno Tegel. The Thesis deals with the secondary compression of clays, which can be defined by the Cα/Cc concept. The one-dimensional creep can be determined using the numerical values of the coefficient of secondary compression Cα and subsequently the thickness of overburden of sediments can be estimated. The two different theories, known a

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Chaimoon, Krit Civil &amp Environmental Engineering Faculty of Engineering UNSW. "Numerical simulation of fracture in unreinforced masonry." 2007. http://handle.unsw.edu.au/1959.4/40757.

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The aims of this thesis are to study the fracture behaviour in unreinforced masonry, to carry out a limited experimental program on three-point bending (TPB) masonry panels and to develop a time-dependent fracture formulation for the study of mode I fracture in quasi-brittle materials. A micro-model for fracture in unreinforced masonry is developed using the concept of the discrete crack approach. All basic masonry failure modes are taken into account. To capture brick diagonal tensile cracking and masonry crushing, a linear compression cap is proposed with a criterion for defining the compre

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