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Tesis sobre el tema "Strain aging"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 26 de julio de 2025

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1

Paul, Graeme William Alexander. "Strain aging of high carbon steel wire." Thesis, University of Strathclyde, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366744.

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2

Dehghani, Kamran. "Static and dynamic strain aging in "Interstitial-free" steels." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0027/NQ50143.pdf.

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3

Cunningham, Sandra. "Effect of substitutional elements on dynamic strain aging in steel." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0017/MQ55019.pdf.

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4

Cunningham, Sandra 1974. "Effect of substitutional elements on dynamic strain aging in steel." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29855.

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Distinct serrations had been observed on the stress-strain curves of various steels tested previously at high temperatures (950--1100°C) at McGill University. An explanation proposed for this behavior was that dynamic strain aging (DSA), caused by the presence of substitutional elements, was taking place. To investigate the possibility that the jerky flow was caused by an interaction between dislocations and substitutional elements, the conditions of temperature and strain rate under which serrated yielding had previously been observed were explored. In addition, some of the same material was

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5

Wei, Qingfeng 1971. "Strain-induced precipitation in ferrite during isothermal aging of Nb microalloyed steel." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82641.

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In niobium (Nb) microalloyed steels one of the strengthening mechanisms is precipitation of Nb(C, N). Precipitation in austenite has been studied and applied for many decades, but its precipitation in ferrite has been paid less attention. Some of the findings are somewhat contradictory.<br>Due to environmental and resource saving consideration in recent years, more and more scrap has been recycled and re-used. Thus, tramp elements inevitably exist in steel such as Cu, Sn, Ni and so on. These elements may influence properties of steels at some extent although they are very little in cont

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6

Lobo, David. "Static and dynamic strain aging of 304 stainless steel at high temperatures." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31060.

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Distinct yield drops and serrations were observed on the stress-strain curves of a 304 type stainless steel when tested at high temperatures (850--1200ºC). A proposed explanation for the behavior is static strain aging (SSA) and dynamic strain aging (DSA), respectively, caused by the presence of substitutional elements.<br>Much of the previous work on this topic has been focused on the effects of interstitials, namely carbon and nitrogen, at lower temperatures (100--300ºC, depending on the strain rate). However, for substitutional elements to have the same effect, the temperature range must be

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7

Mojtaba, Mansouri Arani. "Static strain aging in low carbon ferrite-pearlite steel : forward and reverse loading." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/55894.

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The combination of static strain aging and plastic strain reversal is important to understand for both the forming of components and also analysis of in service performance, for example, in the case of fabrication of pipeline, motor shafts or structural components in buildings and ships. Static strain aging phenomenon has been experimentally studied for the cases of forward and reverse re-straining after aging on a low carbon steel (0.16 wt% C) with a ferrite-pearlite microstructure. Torsion tests on hollow tubular samples were used for the mechanical tests. The shear strain on the surface of

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8

Kemp, Ian Paul. "Heat generation and strain aging in the production of high strength steel wire." Thesis, University of Leeds, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375961.

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9

Vyvial, Brent Aron. "Characterizing strain in the proximal rat tibia during electrical muscle stimulation." Texas A&M University, 2003. http://hdl.handle.net/1969.1/5760.

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Hindlimb unloading is a widely used model for studying the effects of microgravity on a skeleton. Hindlimb unloading produces a marked loss in bone due to increased osteoclast activity. Electrical muscle stimulation is being investigated as a simulated resistive exercise countermeasure to attenuate this bone loss. I sought to determine the relationship between strain measured at the antero-medial aspect of the proximal diaphysis of tibia and plantar-flexor torque measured at the ankle during electrical muscle stimulation as an exercise countermeasure for hindlimb unloading in rats. A mathemati

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10

Butler, Barbara L. "Separation of a brewing yeast strain of Saccharomyces cerevisiae based on cellular age." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=78334.

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In yeast, aging appears to be marked by a progressive impairment in cellular mechanisms, resulting in irreversible changes in physiology and morphology. To date, very little has been reported about the biochemical changes that occur in yeast as a function of individual cell aging. To investigate this further, six generations of a brewing yeast strain of Saccharomyces cerevisiae (NCYC 1239) were separated according to cellular age using continuous phased culturing and biotin-streptavidin magnetic cell sorting.<br>To obtain cells with no bud scars (virgin cells), a concentrated yeast slur

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11

Gomes, De Aguiar Veiga Roberto. "Computational insights into the strain aging phenomenon in bcc iron at the atomic scale." Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00708423.

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Static strain aging is an important concept in metalurgy that refers to the hardening of a material that has undergone plastic deformation and then is aged for a certain period of time. A theory proposed in the late 1940s by Cottrell and Bilby explains this phenomenon as being caused by the pinning of dislocations by impurities (e.g., carbon atoms in solid solution) that migrate to the vicinity of the line defect. In the course of this PhD work, the atomistic mechanism behind the static strain aging phenomenon in bcc iron has been studied by means of computer simulations. Given the fact that d

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12

Aguiar, Veiga Roberto Gomes de. "Computational insights into the strain aging phenomenon in bcc iron at the atomic scale." Thesis, Lyon, INSA, 2011. http://www.theses.fr/2011ISAL0084/document.

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Le vieillissement statique est un concept important dans la métallurgie qui se réfère à un durcissement de la matière ayant subi une déformation plastique et est ensuite vieilli pendant une certaine période de temps. La théorie proposée dans les années 1940 par Cottrell et Bilby explique ce phénomène comme étant causé par l'épinglage des dislocations par les impuretés (par exemple, les atomes de carbone en solution solide) qui migrent au voisinage du défaut de ligne. Au cours de ce travail de thèse, le mécanisme atomistique responsable du phénomène du vieillissement statique dans le fer alpha

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13

Rogers, Wendy J. "Effects of dietary stearic and linoleic acid on mammary carcinogenesis and longevity of aging strain A/ST mice." Virtual Press, 1998. http://liblink.bsu.edu/uhtbin/catkey/1115733.

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This investigation studies the effects of diets containing varying amounts of linoleic acid (a polyunsaturated fatty acid) and stearic acid (a saturated fatty acid) on tumorigenesis, weight and longevity in strain A/ST mice. Linoleic acid [ 18 carbons and 2 double bonds (18:2)] was chosen to represent a fatty acid known to enhance tumorigenesis and obesity in certain strains of mice. Stearic acid [ 18 carbons and no double bonds (18:0)] represents a saturated fatty acid known to increase the latency period for mammary tumor development and to decrease the rate of tumor growth. This study was c

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14

Meng, Chenlu Verfasser], Günter [Akademischer Betreuer] Gottstein, and Gerhard [Akademischer Betreuer] [Hirt. "Dynamic strain aging of Al-Mg alloys after severe plastic deformation / Chenlu Meng ; Günter Gottstein, Gerhard Kurt Peter Hirt." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1171905556/34.

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15

Meng, Chenlu [Verfasser], Günter Akademischer Betreuer] Gottstein, and Gerhard [Akademischer Betreuer] [Hirt. "Dynamic strain aging of Al-Mg alloys after severe plastic deformation / Chenlu Meng ; Günter Gottstein, Gerhard Kurt Peter Hirt." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1171905556/34.

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16

Krug, Felipe. "Estudo dos fenômenos que ocasionam quebras do arame Cultura Aérea derivados do aço SAE 1057B trefilado e galvanizado." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/96510.

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Na busca contínua de atender as exigências de um mercado cada vez mais competitivo, as empresas devem buscar diminuir todas as suas perdas em seus processos produtivos, reduzindo custos e ganhando margem em seus produtos. Este trabalho teve como objetivo investigar os fenômenos presentes na ocorrência de quebras dos produtos derivados do aço SAE 1057B trefilado e galvanizado utilizado em culturas aéreas. O estudo utilizou bibliografia documental, pesquisa de laboratório e uma amostra composta por trinta e seis relatórios de análises sobre o desempenho do produto intermediário trefilado, ou do

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17

Njuguna, Michael Kamau. "Characterisation of multi wall carbon nanotube–polymer composites for strain sensing applications." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/54671/1/Michael_Kamau_Njuguna_Thesis.pdf.

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Carbon nanotubes (CNTs) have excellent electrical, mechanical and electromechanical properties. When CNTs are incorporated into polymers, electrically conductive composites with high electrical conductivity at very low CNT content (often below 1% wt CNT) result. Due to the change in electrical properties under mechanical load, carbon nanotube/polymer composites have attracted significant research interest especially due to their potential for application in in-situ monitoring of stress distribution and active control of strain sensing in composite structures or as strain sensors. To sucessfull

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18

Karakas, Mustafa Serdar. "Effect Of Aging On The Mechanical Properties Of Boron Carbide Particle Reinforced Aluminum Metal Matrix Composites." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608944/index.pdf.

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Metal matrix composites (MMCs) of Al - 4 wt.% Cu reinforced with different volumetric fractions of B4C particles were produced by hot pressing. The effect of aging temperature on the age hardening response of the composites was studied and compared with the characteristics exhibited by the matrix alloy. Reinforcement addition was found to considerably affect the age hardening behavior. Detailed transmission electron microscopy and differential scanning calorimetry observations were made to understand the aging response of the composites. The low strain rate and high strain rate deformation beh

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19

YUAN, QUANWEI. "INVESTIGATION OF HOLE MAKING PRACTICES IN THE FABRICATION OF STRUCTURAL STEEL." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1106723290.

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20

Meade, Robert. "Toward a Better Understanding of the Thermal and Cardiovascular Strain Experienced by Older Adults During Extreme Heat Events." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42117.

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This thesis evaluated physiological responses of young and older adults during extreme heat events and the extent to which commonly recommended heat-health guidelines (indoor temperature limits) and heat mitigation strategies (cooling centres) are effective at limiting hyperthermia and cardiovascular burden. A multidisciplinary narrative review and three experimental studies were conducted. In the review, the mechanisms by which aging impairs the regulation of body temperature and hemodynamic stability, and how they may contribute to the increased risk of heat-related mortality and morbidity i

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21

Mushongera, Leslie T. [Verfasser], та Heike [Akademischer Betreuer] Emmerich. "Strain-induced γ'-coarsening during aging of Ni-base superalloys under uniaxial load : modeling and analysis / Leslie T. Mushongera. Betreuer: Heike Emmerich". Bayreuth : Universität Bayreuth, 2016. http://d-nb.info/1113107367/34.

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22

Hooshmand, Mohammad Shahriar. "Atomic-scale modeling of twinning in titanium and other HCP alloys." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1566143337320934.

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23

Drost, Madeleine A. "Financial Stress and Loneliness in Older Adults." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587579991203744.

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24

Calmunger, Mattias. "Effect of temperature on mechanical response of austenitic materials." Thesis, Linköpings universitet, Konstruktionsmaterial, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-73748.

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Global increase in energy consumption and global warming require more energy production but less CO2emission. Increase in efficiency of energy production is an effective way for this purpose. This can be reached by increasing boiler temperature and pressure in a biomass power plant. By increasing material temperature 50°C, the efficiency in biomass power plants can be increased significantly and the CO2emission can be greatly reduced. However, the materials used for future biomass power plants with higher temperature require improved properties. Austenitic stainless steels are used in most bio

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25

Marcinkevičius, Tomas. "Betono senėjimo koeficiento, prognozuojant valkšnumo deformacijas, lyginamoji analizė." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140625_145725-92860.

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Betono senėjimo koeficientas – tai pagrindinis rodiklis, kuris įvertina betono įtempių kitimą per laiką prognozuojant gežbetoninių elementų įlinkius, įtemptojo gelžbetonio armatūros nuostolius dėl betono valkšnumo ir t.t. Senėjimo keoficieno faktiškai neįmanoma gauti analitine forma iš Volterra integrodiferencialinės lygties, todėl jam yra taikomos skaitiniu būdu gautų rezultatų aproksimacijos arba tiesiog jis imamas apytiksliai lygus 0,8 nediferencijuojant tokių faktorių, kaip betono amžius, stebėjimo laikas, betono stirprumas, armaturos kiekis ir t.t. Baigiamajame magistro darbe atlikta įva

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26

Parvatareddy, Hari. "Durability of Polyimide Adhesives and Their Bonded Joints for High Temperature Applications." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/29554.

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The objective of this study was to evaluate and develop an understanding of durability of an adhesive bonded system, for application in a future high speed civil transport (HSCT) aircraft structure. The system under study was comprised of Ti-6Al-4V metal adherends and a thermosetting polyimide adhesive, designated as FM-5, supplied by Cytec Engineered Materials, Inc. An approach based on fracture mechanics was employed to assess Ti-6Al-4V/FM-5 bond durability. Initially, wedge tests were utilized to find a durable surface pretreatment for the titanium adherends. Based on an extensive scree

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27

Prokopchuk, N. R., Zh S. Shashok, K. V. Vishnevskii, and A. V. Kasperovich. "Properties of Elastomeric Compositions with Highly Dispersed Carbon Additives." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42639.

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The effect of highly dispersed carbon additives (HDCA) obtained in high-voltage discharge plasma on properties of elastomeric compositions is investigated. Some tests to determinate tensile strength, stretching strain, abrasion resistance, hardness and resistance to heat aging of highly filled rubbers based on raw rubber for general and special application are carried out. It is shown that HDCA addition permits to improve performance characteristics of elastomers based on butadiene-acrylonitrile rubber.

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28

Marais, Anthony. "Influence du vieillissement statique sur la transition ductile-fragile des aciers au C-Mn." Phd thesis, École Nationale Supérieure des Mines de Paris, 2012. http://pastel.archives-ouvertes.fr/pastel-00820120.

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Les aciers ferritiques pour structures industrielles présentent une transition fragile-ductile de ténacité et de résilience avec leur température. Leur résistance à la rupture fragile joue un rôle essentiel dans la certification de la sécurité des structures industrielles importantes. De nos jours, le souci de performance et de longévité sont des points clés pour des acteurs majeurs comme EDF.Dans ces études de transition ductile-fragile, de ténacité et de résilience, la ténacité est prédite à partir de la résilience. Plusieurs travaux antérieurs ont déjà montré que la probabilité de rupture p

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29

Wang, Huaidong. "Comportement mécanique et rupture des aciers au C-Mn en présence de vieillissement dynamique." Phd thesis, Ecole Centrale Paris, 2011. http://tel.archives-ouvertes.fr/tel-00704515.

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Le vieillissement dynamique se manifeste en particulier par le phénomène de Portevin-Le Chatelier (PLC). Il se produit dans les aciers aux environs de 200°C pour des sollicitations quasi-statiques. Dans les aciers au C-Mn, il conduit à une chute de ductilité et de ténacité qui doit être prise en compte dans le dimensionnement des structures de sûreté. L'objectif de la thèse consiste à modéliser le comportement mécanique des aciers au C-Mn en tenant compte du vieillissement dynamique et à prédire leur rupture ductile en présence de ce phénomène. Le comportement mécanique du matériau étudié, un

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30

Huttin, Olivier. "Dépistage du vieillissement cardio-vasculaire : impact des nouveaux marqueurs d’imagerie." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0017/document.

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Le vieillissement cardiaque est fortement associé à l’apparition d’une fibrose pouvant entrainer une dysfonction progressive du remplissage et de l’éjection ventriculaire. Le dépistage du remodelage et du vieillissement cardiovasculaire sont primordiaux afin de proposer des stratégies de prévention et de prises en charge spécifiques visant à retarder l’apparition ou ralentir la progression d’une insuffisance cardiaque à fraction d’éjection préservée. Les outils cliniques, biologiques ou d’imagerie sont insuffisamment performants à l’heure actuelle pour dépister ces modifications précoces ou pr

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31

Amaral, José Carlos do. "Tensões originadas pela retração em elementos de concreto com deformação restringida considerando-se o efeito da fluência." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3144/tde-25082011-132239/.

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As estruturas feitas com pré-moldados são geralmente compostas por uma base (peça pré-fabricada) mais concreto moldado no local, como é o caso de lajes (pré- lajes, lajes alveolares, aduelas de pontes). No concreto novo junto à interface de contato entre os elementos surgem tensões de tração devidas à restrição a deformação de retração por secagem imposta pela base. Portanto, ressalta-se a importância em conhecer tais tensões, pois, as mesmas podem provocar a fissuração do concreto. Por essa relevância, estuda-se neste trabalho o comportamento da tensão de tração resultante na estrutura compos

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32

Belotteau, Jeanne. "Comportement et rupture d’un acier au C-Mn en présence de vieillissement sous déformation." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2009. http://www.theses.fr/2009ECAP0002/document.

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Les aciers de construction au carbone manganèse (C-Mn) sont largement utilisés pour diverses applications mécaniques, et en particulier pour les tuyauteries de circuit secondaire des centrales nucléaires de type Réacteurs à Eau sous Pression (REP). La robustesse des composants des circuits sous pression des REP vis-à-vis de la fissuration doit être démontrée, tant au niveau de la conception que de l’exploitation. Les aciers au C-Mn sont sensibles au vieillissement sous déformation qui entraîne une chute importante de ductilité et de ténacité entre 150 et 350°C,températures de service des tuyau

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33

Venables, R. "Dynamic strain ageing and the fatigue behaviour of nimonic 901." Thesis, University of Nottingham, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376646.

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34

Max, Bertrand. "Comportement mécanique et couplage mécanique-oxydation dans l'alliage 718 : effet des éléments en solution solide." Thesis, Toulouse, INPT, 2014. http://www.theses.fr/2014INPT0063/document.

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L'alliage 718 est le superalliage le plus utilisé industriellement du fait de ses excellentes propriétés mécaniques, ainsi que de sa tenue à l'oxydation et à la corrosion dans une large gamme de températures et de modes de sollicitation. Néanmoins, cet alliage présente une sensibilité vis-àvis des phénomènes de corrosion sous contrainte et fissuration assistée par l'oxydation sous contrainte dans les gammes de température de service. Les mécanismes à l'origine de ce phénomène restent encore mal compris, cependant un lien entre le changement de mode de rupture et les domaines d'apparition d'ins

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35

Huang, Zhiyong. "Endommagement des aciers au C-Mn en fatigue oligocyclique et gigacyclique." Thesis, Paris 10, 2010. http://www.theses.fr/2010PA100088.

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Dans les générateurs de vapeur des centrales nucléaires à eau pressurisée, les tuyauteries sont soumises à des chargements thermique et mécanique, qui sont variables et divisés en deux régimes différents : la fatigue oligocyclique et la fatigue gigacyclique. Les aciers au carbone – manganèse, type A42, A48 et Tu48 (normes françaises) sont souvent utilisés dans de telles applications. Les propriétés du matériau manifestent certains caractères spéciaux en mécanique et métallurgie comme le vieillissement dynamique conduisant à une augmentation de la valeur de la contrainte maximale et une diminut

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36

Brown, Peter. "The Bauschinger effect in high strength naval steels." Thesis, Open University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298181.

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37

Walubita, Lubinda F. "Comparison of fatigue analysis approaches for predicting fatigue lives of hot-mix asphalt concrete (HMAC) mixtures." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/3898.

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Hot-mix asphalt concrete (HMAC) mixture fatigue characterization constitutes a fundamental component of HMAC pavement structural design and analysis to ensure adequate field fatigue performance. HMAC is a heterogeneous complex composite material of air, binder, and aggregate that behaves in a non-linear elasto-viscoplastic manner, exhibits anisotropic behavior, ages with time, and heals during traffic loading rest periods and changing environmental conditions. Comprehensive HMAC mixture fatigue analysis approaches that take into account this complex nature of HMAC are thus needed to ensure ade

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38

Marchenko, Arina. "Analyse multi-échelles de la viscoplasticité à froid et de la rupture différée du titane en relation avec ses teneurs en hydrogène et oxygène." Thesis, Paris, ENMP, 2015. http://www.theses.fr/2015ENMP0030/document.

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Le titane et ses alliages qui sont largement répandus dans l'industrie aéronautique, sont concernés par le fluage à température ambiante ce qui conduit à une réduction de la résistance et provoque le phénomène de rupture différée. Une partie des études montrent que ce comportement viscoplastique inhabituel à température ambiante est lié aux phénomènes d'interactions entre les dislocations et les atomes interstitiels comme l'hydrogène et l'oxygène, aussi appelés vieillissement statique et dynamique. Le but de cette étude à la fois expérimentale et numérique multi-échelle est de mieux comprendre

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39

ITOH, Yoshito, Haosheng GU, Kazuya SATOH, et al. "EXPERIMENTAL INVESTIGATION ON AGEING BEHAVIORS OF RUBBERS USED FOR BRIDGE BEARINGS." 土木学会, 2006. http://hdl.handle.net/2237/8622.

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40

Gueda, Moussa Moussa. "Biomarqueurs quantitatifs de la déformation myocardique multi-chambres et multidirectionnelle en imagerie IRM dynamique." Electronic Thesis or Diss., Sorbonne université, 2024. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2024SORUS104.pdf.

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La déformation du myocarde quantifiée en imagerie échocardiographique ou en imagerie par résonnance magnétique (IRM) dynamique par traitement d'images conventionnel (suivi de textures), est un marqueur puissant de l'atteinte myocardique, tant il est modifié précocement au cours de la maladie comparé aux marqueurs globaux communément utilisés en routine clinique. Malgré ses performances, son utilisation systématique en routine reste entravée par la complexité et le temps d'analyse nécessaires à l'initialisation manuelle des bords du myocarde.De plus, les logiciels cliniques sont le plus souvent

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41

Ben, Hassine Mouna. "Modélisation du vieillissement thermique et mécanique d’une protection externe en EPDM de jonctions rétractables à froid." Thesis, Paris, ENSAM, 2013. http://www.theses.fr/2013ENAM0048/document.

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L'objectif de cette thèse est l'étude des conséquences de la thermo-oxydation sur la structure chimique et le comportement mécanique d'un Ethylène Propylène Diène Monomère (EPDM). Afin de déterminer les modifications à différentes échelles structurales, quatre formulations modèles sont étudiées : la gomme pure, les matrices vulcanisées stabilisée et non stabilisée et l'élastomère industriel. L'ensemble des échantillons est vieilli entre 70 et 170°C dans l'air ou sous vide puis caractérisé par divers outils analytiques. La thermogravimétrie donne accès aux variations de masse résultant de l'inc

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Przydatek, Jan. "The elevated temperature deformation of aluminium alloy 2650." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287577.

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Farron, Victoria Jane. "Effects of microstructure and strain ageing on toughness of nuclear PWR reactor weld metals." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/1114/.

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The effects of microstructure and prestraining and ageing on ductile-to-brittle transition temperature, fracture toughness and cleavage fracture resistance of a multi-pass low-alloy ferritic steel weld metal have been investigated. The weld metal simulated submerged arc welds used in the fabrication of Sizewell B power station reactor pressure vessel. The study aimed to investigate differences in mechanical properties of a single microstructure; asdeposited and reheated microstructures and subjected to various mechanical tests. Additionally, to simulate the effects of irradiation embrittlement

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Pu, Xiaoxue. "Thermomechanical study of the gigacycle fatigue behavior of pure iron and carbon-manganese steels : influence of chemical composition and microstructure on damage and crack initiation mechanism." Thesis, Paris 10, 2019. http://www.theses.fr/2019PA100051.

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Ce travail tente de mieux comprendre les dommages par fatigue dans les aciers à ferrite-perlite dans la fatigue à très grand nombre de cycles (VHCF). Les influences de deux paramètres, le pourcentage de phase perlite et le pourcentage d'atomes interstitiels libres dans une solution solide, sont étudiées pour comprendre les mécanismes de dissipation en fatigue à 20 kHz. Une thermographie infrarouge in situ est réalisée pour enregistrer les changements de température, tandis que des observations au microscope sont menées pour étudier le mécanisme de dissipation. Pour les matériaux de BCC, sous f

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Nagaraja, Srinidhi. "Microstructural Stresses and Strains Associated with Trabecular Bone Microdamage." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14093.

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Bone is a composite material consisting of hydroxyapatite crystals deposited in an oriented manner on a collagen backbone. The arrangement of the mineral and organic phases provides bone tissue with the appropriate strength, stiffness, and fracture resistance properties required to protect vital internal organs and maintain the shape of the body. A remarkable feature of bone is the ability to alter its properties and geometry in response to changes in the mechanical environment. However, in cases of metabolic bone diseases or aging, bone can no longer successfully adapt to its environment, inc

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Anderson, Dennis Earl. "An examination of age-related differences in lower extremity joint torques and strains in the proximal femur during gait." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/26545.

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Hip fractures are serious injuries that are associated with high rates of morbidity and mortality in older adults. While much of the increased risk of hip fracture with age can be explained by age-related decreases in bone mineral density, muscles and motor control are altered by aging as well. Muscles forces in vivo are thought to have a prophylactic effect that can reduce shear and bending in the femur. This is beneficial because bone is stronger in compression than in shear or tension, and shear plays an important role in fatiguing bone. Understanding how aging and muscular loads affect str

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Lukaszyk, Caroline. "Falls in older Aboriginal people: risk factors, burden, and development of a culturally appropriate fall prevention intervention." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/18045.

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Abstracts – oral conference presentations Lukaszyk, C., Harvey, L., Sherrington, C., Close, J., Coombes, J., Mitchell, R., Moore, R., Ivers, R. Fallrelated injury hospitalisations for Aboriginal and Torres Strait Islander people aged 50+ in New South Wales, Australia, 15th World Congress on Public Health, April 2017, Melbourne, Australia Lukaszyk, C., Harvey, L., Sherrington, C., Close, J., Coombes, J., Ivers, R. Investigating hospitalisations due to fall-related injury for older Aboriginal and Torres Strait Islander people in New South Wales, Australia, 7th Biennial Australia and New Zealand

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Graff, Stéphanie. "Viscoplastic behavior of zirconium alloys in the temperatures range 20°C-400°C : characterization and modeling of strain ageing phenomena." Phd thesis, École Nationale Supérieure des Mines de Paris, 2006. http://tel.archives-ouvertes.fr/tel-00180646.

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De nombreuses manifestations macroscopiques de vieillissement dans les alliages dilués de zirconium et dans le domaine de température 20°C-600°C ont été reportés dans la littérature. Les phénomènes de vieillissement peuvent être associés à l'interaction dislocations-atomes de soluté. Toutefois, l'influence systématique des éléments d'addition et la caractérisation précise du domaine de vieillissement en termes de température et de vitesse de déformation restent toutefois mal appréhendées à ce jour .....

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Kulkarni, Priyanka Prashant. "Use of non Saccharomyces yeast strains coupled with ultrasound treatments as a novel technique to accelerate aging over lees of red wines and its repercussion in sensorial parameters." Master's thesis, ISA/UL, 2014. http://hdl.handle.net/10400.5/8636.

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Mestrado Vinifera EuroMaster - Instituto Superior de Agronomia<br>Ageing over lees has long been considered to benefit the overall quality of wine, enhancing the body and mouthful as well as sensorial complexity, color stability. Despite of all the positive attributes conferred by this technique, it is a complex process which could last up to years and is affected by several variables of different nature and complexities. This process has several economic impacts representing large investments for all producers to store the wines in cellars as well as the wine maker has to bear the potential r

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Petretto, Francesco <1983&gt. "Le reologia dei leganti bituminosi stradali: studio delle proprietà meccaniche a seguito di processi di “aging” in laboratorio." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5635/1/Petretto_Francesco_Tesi.pdf.

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Lo studio effettuato pone le sue basi sulla ricerca di materiali stradali che combinino ad elevati standard prestazionali, la riduzione dell’impatto ambientale in fase realizzativa e manutentiva. In particolare il seguente lavoro si occupa dello studio di 7 leganti modificati con polimeri ed additivati con cere. I primi infatti conferiscono alla miscela maggiore elastoplasticità, incrementandone la durabilità e la resistenza a fatica. Nei secondi la presenza del materiale paraffinico contribuisce a ridurre la viscosità del bitume, consentendo un notevole abbassamento della temperatura di produ

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