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Dissertations / Theses on the topic 'Hardening-Softening'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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1

Mshana, S. J. "Rate-dependent constitutive equations of cyclic softening and hardening." Thesis, University of Ottawa (Canada), 1986. http://hdl.handle.net/10393/5422.

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2

Tahar, Benabdellah. "Câ†2 continuous hardening/softening elasto-plasticity model for concrete." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323061.

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3

Zeng, Xiaohui. "Modeling hardening and softening due to high-angle grain boundaries in crystalline solids /." Göttingen : Cuvillier, 2007. http://d-nb.info/985835710/04.

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4

Mesmar, Sultan. "On the use of viscosity as a regularisation technique for hardening/softening constitutive models." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341798.

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5

Li, Tianbai. "Stress integration strategies for a new hardening/softening elasto-plasticity model for structural concrete." Thesis, University of Sheffield, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425181.

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6

Conca, Luca. "Mechanical properties of polymer glasses : Mechanical properties of polymer glasses." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1050/document.

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Ce manuscrit présente des récentes extensions au modèle PFVD, basé sur l'hétérogénéité de la dynamique des polymères vitreux à l'échelle de quelques nanomètres et résolu par simulation en 3D, afin de fournir une description physique unifiée des propriétés mécaniques et dynamiques des polymères vitreux soumis à déformation plastique. Trois sujets principaux sont traités : La plastification. Sous déformation, les polymères atteignent le seuil de plasticité (yield) à quelques pourcents de déformation et quelques dizaines de MPa. Nous proposons que l'énergie élastique absorbée à l'échelle des hété

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7

Kopūstienė, Diana. "Korozijai ir karščiui atsparaus plieno standaus apkrovimo ciklinių deformavimo parametrų nustatymas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2005. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2005~D_20050613_191225-20900.

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It is impossible to improve the quality of the machines, to increase their reliability and lifetime if the working conditions and the properties of the material are not analyzed. We must know the type of the material (hardening, softening or cyclically stabile), what is chosen for the constructions in low cycle loading, because strain and stress change during the exploitation and depend on this type. If we know the type of the material, we can determine the possibility of its application in concrete exploitation conditions. Real working conditions of the most constructions are close to loading

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8

Kpodekon, Crescent. "Effet du pré-écrouissage sur la durée de vie d'aciers austénitiques de type 304L." Phd thesis, INSA de Rouen, 2010. http://tel.archives-ouvertes.fr/tel-00581715.

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Le travail s'intéresse aux effets de l'histoire de chargement sur le comportement et la durée de vie en fatigue de deux nuances (THYSSEN et CLI)d'un acier inoxydable austénitique 304L à la température ambiante. Les essais ont été réalisés en utilisant deux catégories d'éprouvettes. Les éprouvettes de la première catégorie (vierges) ont été soumises à des essais classiques de fatigue,alors que celles de la deuxième ont subi, avant les essais de fatigue, un pré-écrouissage monotone ou cyclique en déformation imposée. Les éprouvettes vierges manifestent un adoucissement cyclique suivi d'un durcis

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9

Miyagi, Lowell. "Microstructures and Deformation in Some Fault Rocks From The McConnell Thrust at Mount Yamnuska (Alberta) : Implications for Fluid Flow and Faulting and Cycles of Strain-Hardening and Softening." Oberlin College Honors Theses / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=oberlin1411739220.

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10

Diao, Hui. "Deformation behaviours of coarse-grained and nanocrystalline Mg-5wt% Al alloys." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/46870/1/Hui_Diao%27s_Thesis.pdf.

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Magnesium alloys have been of growing interest to various engineering applications, such as the automobile, aerospace, communication and computer industries due to their low density, high specific strength, good machineability and availability as compared with other structural materials. However, most Mg alloys suffer from poor plasticity due to their Hexagonal Close Packed structure. Grain refinement has been proved to be an effective method to enhance the strength and alter the ductility of the materials. Several methods have been proposed to produce materials with nanocrystalline grain stru

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11

Kuprin, Corinna. "Verformungsverfestigung bei zyklisch inkrementeller Torsion von Reineisen und dem Stahl 42CrMo4N." Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-103890.

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Die Arbeit widmet sich dem Fließverhalten von Stählen bei zyklisch inkrementeller Torsion. Dazu werden vergleichend Reineisen und der ferritisch-perlitische Stahl 42CrMo4N bei unterschiedlichen Verformungspfaden betrachtet. Vor allem in zyklischen Torsionsversuchen mit bleibendem Verformungsinkrement je Zyklus werden Fließkurvenverläufe und Verformungsverfestigung analysiert. Die Ergebnisse belegen den Einfluss des lamellaren Zementit auf das Fließverhalten des Stahls 42CrMo4N, während die Eigenschaften des Reineisens von der entstehenden Versetzungszellstruktur bestimmt werden. Die Richtungsa

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12

KLODA, LUKASZ. "Coupled longitudinal-transversal vibrations of nonlinear planar Timoshenko beams with an axial end spring." Doctoral thesis, Università Politecnica delle Marche, 2020. http://hdl.handle.net/11566/274580.

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Questa tesi di dottorato analizza la dinamica non lineare di una trave omogenea e isotropa. Sono state inizialmente ricavate le equazioni differenziali alle derivate parziali del moto per un modello di trave rettilinea nel caso piano, tenendo conto degli effetti dell’estensibilità, di taglio e dell’inerzia longitudinale, trasversale e rotazionale, e per diverse definizioni di curvatura. Per le particolari condizioni al contorno scelte (trave incernierata – semplicemente appoggiata con una molla assiale), è stato utilizzato il metodo alle scale temporali multiple (multiple time-scales) per cogl

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13

López, Martínez Juan Ángel. "CHARACTERISATION OF THE TENSILE BEHAVIOUR OF UHPFRC BY MEANS OF FOUR-POINT BENDING TESTS." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/79740.

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Combining the most recent technologies in concrete, Ultra-High-Performance Fibre-Reinforced Concrete (UHPFRC) arises as a promising material for the near future. UHPFRC have shown how flexible concrete can be to adapt to the ever-changing social and environmental demands. With its high flexibility composition and its mechanical properties, UHPFRC is full of both unexplored and unexploited possibilities. Engineers should take responsibility for this task. However, it is fair to acknowledge that this is not an easy task and it requires the development of reliable and widely accepted design stand

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14

Alamo, Vargas Valentin. "Transfert énergétique irréversible grâce à un résonateur acoustique à comportement non-linéaire." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSET006/document.

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Dans un contexte d’amélioration des dispositifs pour la réduction de bruit, l’étude sur le transfert d’énergie irréversible en utilisant des résonateurs purement acoustiques à comportement non linéaire a été réalisée. Les résonateurs acoustiques classiques en régime linéaire agissent comme un Amortisseur de Masse Accordée (TMD, en anglais) et ils sont efficaces pour une gamme de fréquence très étroite. Cependant, lorsqu’ils sont soumis à des excitations très fortes (régime non-linéaire) ils peuvent devenir efficaces pour une plus large gamme de fréquences si des termes non linéaires peuvent êt

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15

Šmíd, Miroslav. "Stanovení zkrácených cyklických deformačních křivek superslitiny Inconel 738LC při zvýšených teplotách." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228279.

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Multiple step tests under cyclic strain control have been performed using cylindrical specimens of cast polycrystalline Inconel 738LC superalloy at 23, 700, 500, 800 and 900 °C in laboratory atmosphere to obtain cyclic stress-strain curves. During cyclic straining of specimen were obtained cyclic hardening-softening curves. Their progress changed with temperature and strain amplitude. Evaluated cyclic stress-strain curves are shifted to lower stresses with increasing temperature. Surface relief was observed in fatigued specimens under SEM and metalography under optic microscopy. Slip markings

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16

Wassermann, Alice. "Quantification multi-échelles de la dégradation d’un sable traité soumis à des cycles hydriques." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0085.

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Le traitement des sols, notamment par des liants hydrauliques ou de la chaux, est une technique très répandue pour améliorer les caractéristiques mécaniques d'un sol de qualité insuffisante. Après leur construction, les ouvrages en sols traités sont soumis à des sollicitations environnementales qui peuvent potentiellement altérer les effets du traitement, et donc conduire à la dégradation de la performance du sol traité. Dans ce contexte, l'objectif de la thèse est d'étudier l'impact de l'accumulation de cycles hydriques sur le comportement mécanique d'un sable traité au ciment. Une méthodolog

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17

Danka, Labus Zlatanović. "Friction stir spot welding of ultrathin sheets made of aluminium – magnesium alloy." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2020. https://www.cris.uns.ac.rs/record.jsf?recordId=114672&source=NDLTD&language=en.

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Within the framework of presented PhD, friction stir spot welding (FSSW) ofmultiple ultrathin sheets of AA 5754 – H111 (AlMg3) alloy 0.3 mm thick, wasstudied. The influence of tool geometry and process parameters such as rotationalspeed and axial load have been analysed using numerous techniques. It has beenunderstood that during the welding at low rotational speeds weld zone undergoesstrain hardening, while at high rotational speeds weld zone undergoes thermalsoftening. It was observed that during FSSW at low rotational speeds a complexlayer at weld interface is present, which causes de

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18

Chalmovský, Juraj. "Analýza chování kořene kotvy v jemnozrnných zeminách." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-392297.

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Ground anchors represent an important structural element in the area of ground engineering. Despite an extensive usage of these elements, their design is usually performed using simple empirical and semi-empirical methods. An application of these procedures brings to the design a number of simplifying assumptions. The goal of the dissertation is to refine the computational design of ground anchors, analysis and quantification of selected factors significantly affecting their load displacement behavior. Firstly, the finite element method is applied. Two novel constitutive models are used: Multi

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19

Günther, Ralf-Michael. "Erweiterter Dehnungs-Verfestigungs-Ansatz." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2010. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-27196.

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Gegenstand der Dissertation ist die Entwicklung eines Stoffmodells für duktile Salzgesteine, mit dem alle drei Kriechphasen, abhängig von einem inneren Zustandsparameter, beschrieben werden können. Die Modellierung der Schädigungs- bzw. Dilatanzentwicklung und deren Rückkopplung auf das Kriechverhalten ist das Kernstück der Stoffmodellentwicklung. Es wird eine Beziehung abgeleitet, die die Dilatanzentwicklung abhängig vom Manteldruck und der spezifischen Formänderungsarbeit beschreibt. Durch diese Formulierung und deren Verknüpfung mit dem o. g. Zustandsparameter lassen sich tertiäres Kriechen

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20

Günther, Ralf-Michael. "Erweiterter Dehnungs-Verfestigungs-Ansatz: Phänomenologisches Stoffmodell für duktile Salzgesteine zur Beschreibung primären, sekundären und tertiären Kriechens." Doctoral thesis, TU Bergakademie Freiberg, 2009. https://tubaf.qucosa.de/id/qucosa%3A22710.

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Gegenstand der Dissertation ist die Entwicklung eines Stoffmodells für duktile Salzgesteine, mit dem alle drei Kriechphasen, abhängig von einem inneren Zustandsparameter, beschrieben werden können. Die Modellierung der Schädigungs- bzw. Dilatanzentwicklung und deren Rückkopplung auf das Kriechverhalten ist das Kernstück der Stoffmodellentwicklung. Es wird eine Beziehung abgeleitet, die die Dilatanzentwicklung abhängig vom Manteldruck und der spezifischen Formänderungsarbeit beschreibt. Durch diese Formulierung und deren Verknüpfung mit dem o. g. Zustandsparameter lassen sich tertiäres Kriechen

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21

Mezquida, Alcaraz Eduardo José. "Numerical Modelling of UHPFRC: from the Material to the Structural Element." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/167017.

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[ES] El principal objetivo de la presente tesis es el desarrollo de una completa metodología para el modelado numérico del UHPFRC desde el material hasta el elemento estructural. Se pretende contribuir al avance del conocimiento del comportamiento mecánico del UHPFRC obteniendo como resultado un procedimiento para la modelización numérica que permita el modelado y diseño estructural que permitiría hacer que este material fuera competitivo para ser utilizado en el mercado de la construcción. En la metodología de modelado propuesta, se considera un comportamiento constitutivo del UHPFRC optimiza

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22

Hsiao, Sheng-Yuan, and 蕭勝元. "Strain Softening and Anneal Hardening in Alloys." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/8q3836.

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碩士<br>大同大學<br>材料工程學系(所)<br>95<br>In this study thermomechanical processings were applied to four alloys, including AZ31 and L9 Mg alloys, 6061 Al alloy and Cu-30%Zn alloy, for the strain softening and anneal hardening studies. By using differential scanning calorimetry (DSC), optical microscopy (OM), and elevated temperature compression test. The relationships between microstructure evolution and the behaviors of strain softening and anneal hardening were examinated. The results showed that the elevated temperature strength of alloys is inversely proportional to the applied pre-strain, which l

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23

Mohan, Nisha. "Extracting Material Response from Simple Mechanical Tests on Hardening-Softening-Hardening Viscoplastic Solids." Thesis, 2014. https://thesis.library.caltech.edu/8235/1/Nisha_Mohan_2014.pdf.

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<p>Compliant foams are usually characterized by a wide range of desirable mechanical properties. These properties include viscoelasticity at different temperatures, energy absorption, recoverability under cyclic loading, impact resistance, and thermal, electrical, acoustic and radiation-resistance. Some foams contain nano-sized features and are used in small-scale devices. This implies that the characteristic dimensions of foams span multiple length scales, rendering modeling their mechanical properties difficult. Continuum mechanics-based models capture some salient experimental features like

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24

Wu, Yu-Ting, and 吳昱霆. "Analysis of Collapse Surfaces for Trusses with Hardening and Softening." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/24716981297439472671.

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碩士<br>國立臺灣大學<br>土木工程學研究所<br>100<br>There are some severe restrictions in the traditional limit analysis. For the load type, the load space is one-dimensional and monotonic by imposing the restriction of uni-directional proportional loading. On the other hand, only can the constitutive law be perfectly elastic, either rigid-perfectly plastic or elastic-perfectly plastic. However, the load space is usually high dimensional in true situation, and the hardening/softening behavior prevails in almost all engineering structures. To deal with these problems, it is important to loose the above restrict

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25

Xiao, Xiong. "Development and application of cavity expansion theory based on bounding surface and kinematic hardening plasticity." Thesis, 2020. http://hdl.handle.net/1959.13/1411293.

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Research Doctorate - Doctor of Philosophy (PhD)<br>In this thesis, the undrained and drained spherical cavity expansions in clays are analysed according to a new viewpoint, in which this boundary problem is treated as the integration of stress-strain following cavity expansion load paths. The widely adopted substepping scheme numerical integration technique is used in developing the undrained and drained solution of cavity expansion problems based on the modified UH model and the original and modified two-surface bubble models. This bounding surface plasticity series model has been proved to h

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26

Yu, Yu-Sheng, and 余育陞. "A Study on the Strain Softening and Anneal Hardening in Zn-22 wt％ Al Alloy." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/36961256043992689091.

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碩士<br>大同大學<br>材料工程學系(所)<br>93<br>In this study thermomechanical processings were applied to a Zn-22 wt.% Al alloy to produce fine- and coarse-grained structures for the strain softening and anneal hardening studies. The microstructure, hardness and compression curve of Zn-22 wt.% Al alloy were studied by using differential scanning calorimetry (DSC), scanning electron microscopy (SEM), microhardness measurements and compression tester. The results showed the occurrence of a strain softening phenomenon in the Zn-Al alloy in the temperature range from -10℃ to 250℃ and an anneal hardening behavio

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27

Chan, Yu-Shuo, and 詹育碩. "A Study on the Strain Softening and Anneal Hardening in Pseudo-single- and Dual-phase Zn-Al Alloys." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/51769460161026877329.

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碩士<br>大同大學<br>材料工程學系(所)<br>94<br>In this study thermomechanical processings were applied to three Zn-Al alloys, namely the micro-duplex Zn-22 wt.% Al alloy, pseudo-single α phase Zn-95 wt.% Al and pseudo-single β phase Zn-1wt.% Al for the strain softening and anneal hardening studies. The microstructure, hardness and compression S-S curves of these Zn-Al alloys were studied by using differential scanning calorimetry (DSC), scanning electron microscopy (SEM), microhardness measurements and compression tester. The results showed the occurrence of a strain softening phenomenon in Zn-Al alloys con

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28

Cheng, Y. "Investigation of mechanical behaviours of Eucalyptus nitens timber." Thesis, 2022. https://eprints.utas.edu.au/47524/1/Cheng_whole_thesis.pdf.

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This research focuses on the investigation of the mechanical properties of plantation Eucalyptus nitens timber and the understanding of its underlying failure mechanism above and below the fibre saturation point both experimentally and numerically. Fast-growing eucalypts are now considered potential building materials; one such re-source is plantation Eucalyptus nitens. To use such a resource as structural or engineered timber, that is to establish design codes and specifications, its compressive and bending strengths need to be studied as they are two important mechanical properties for str

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29

Kuprin, Corinna. "Verformungsverfestigung bei zyklisch inkrementeller Torsion von Reineisen und dem Stahl 42CrMo4N." Doctoral thesis, 2012. https://monarch.qucosa.de/id/qucosa%3A19830.

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Die Arbeit widmet sich dem Fließverhalten von Stählen bei zyklisch inkrementeller Torsion. Dazu werden vergleichend Reineisen und der ferritisch-perlitische Stahl 42CrMo4N bei unterschiedlichen Verformungspfaden betrachtet. Vor allem in zyklischen Torsionsversuchen mit bleibendem Verformungsinkrement je Zyklus werden Fließkurvenverläufe und Verformungsverfestigung analysiert. Die Ergebnisse belegen den Einfluss des lamellaren Zementit auf das Fließverhalten des Stahls 42CrMo4N, während die Eigenschaften des Reineisens von der entstehenden Versetzungszellstruktur bestimmt werden. Die Richtungs

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