Relevant bibliographies by topics / Multiaxial deformation

Academic literature on the topic 'Multiaxial deformation'

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Published: 4 May 2024

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Journal articles on the topic "Multiaxial deformation"

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Yaguchi, Masatsugu, Masato Yamamoto, Takashi Ogata, and Nobutada Ohno. "An Anisotropic Constitutive Model for a Directionally Solidified Superalloy." Key Engineering Materials 340-341 (June 2007): 901–6. http://dx.doi.org/10.4028/www.scientific.net/kem.340-341.901.

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The monotonic tensile and creep deformations of a directionally solidified (DS) superalloy are investigated for several loading directions. The material exhibits remarkable anisotropy under elastic and creep loading conditions, whereas it shows isotropy under loading conditions of high strain rates. Tension-torsion creep tests are also conducted to investigate the deformation under multiaxial stress conditions. Referring to the observed behavior, a unified constitutive model, which has two features, is developed for the DS superalloy. One is a static recovery term of back stresses that is prescribed as a transversely isotropic property, which is supposed to have an effect on the deformation behavior under creep loading conditions. The other is the division of inelastic strain into two components, which represent octahedral and cubic slip system deformations, so as to describe multiaxial creep deformation. Calculation results obtained using the constitutive model are compared with the uniaxial and multiaxial experimental results to evaluate the validity of the model.
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Yang, Xianjie, Yan Luo, and Qing Gao. "Constitutive Modeling on Time-Dependent Deformation Behavior of 96.5Sn-3.5Ag Solder Alloy Under Cyclic Multiaxial Straining." Journal of Electronic Packaging 129, no. 1 (May 18, 2006): 41–47. http://dx.doi.org/10.1115/1.2429708.

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Based on the time dependent multiaxial deformation behavior of 96.5Sn-3.5Ag solder alloy, a constitutive model is proposed which considers the nonproportional multiaxial cyclic deformation properties. In the back stress evolution equations of this model, the nonproportionality which affects the back stress evolution rate is introduced. The approach for the determination of model parameters is proposed. The model is used to describe the time-dependent cyclic deformation behavior of 96.5Sn-3.5Ag solder alloy under cross, rectangular, rhombic, and double-triangular tensile–torsion multiaxial strain paths at different strain rates with different dwell time. The comparison between the predicted and experimental results demonstrates that the model can satisfactorily describe the time-dependent multiaxial cyclic deformation behavior under complicated nonproportional cyclic straining.
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Termonia, Yves. "Multiaxial deformation of polymer networks." Macromolecules 24, no. 5 (September 1991): 1128–33. http://dx.doi.org/10.1021/ma00005a024.

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Li, Jiejie, Jie Li, Yangheng Chen, and Jian Chen. "Strengthening Modulus and Softening Strength of Nanoporous Gold in Multiaxial Tension: Insights from Molecular Dynamics." Nanomaterials 12, no. 24 (December 8, 2022): 4381. http://dx.doi.org/10.3390/nano12244381.

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The functionalized applications of nanoporous metals place clear requirements on their basic mechanical properties, yet there is a lack of research on the mechanical response under multiaxial loading conditions. In this work, the mechanical behaviors of nanoporous gold under multiaxial tension are investigated via molecular dynamics simulations. The mechanical properties under different loading conditions are compared and the microstructure evolution is analyzed to clarify the deformation mechanisms of nanoporous gold in biaxial and triaxial tension. It is found that the modulus of nanoporous gold in multiaxial tension is strengthened and the strength is softened compared to uniaxial tension. The failure of nanoporous gold in multiaxial tension is dominated by the progressive yielding, necking, and rupture of ligaments along the multiple uniaxial loading directions. The dislocation activity under multiaxial loads is more intense and more prone to plastic deformation, ultimately resulting in lower strength and smaller failure strain. The findings provide more insight into the understanding of the deformation mechanisms of nanoporous metals under complex stress states.
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Kwapisz, Marcin, Marcin Knapiński, Henryk Dyja, and Konrad Błażej Laber. "Numerical Analysis in the Process of Alternate Pressing and Multiaxial Compression." Materials Science Forum 706-709 (January 2012): 1763–68. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.1763.

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This article presents the results of numeric simulation obtained with commercial software for thermo-mechanical analysis of plastic forging processes, Forge 2009, of the process of alternate forced pressing and multiaxial compression. The new method of alternate forced pressing and multiaxial compression suggested by the authors is characterized by the presence in the plastically forged material of the similar states of deformations to those present in the processes of the equal channel angular pressing and cyclic extrusion compressing. From the performed preliminary tests it can be stated that as a result of combining and repeating two alternate operations: pressing and multiaxial compression, strain accumulation and development of deformation state favorable to grain crushing take place.
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Kubo, Atsushi, and Yoshitaka Umeno. "Coarse-Grained Molecular Dynamics Simulation of Fracture Problems in Polycarbonate." Solid State Phenomena 258 (December 2016): 73–76. http://dx.doi.org/10.4028/www.scientific.net/ssp.258.73.

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A coarse-grained particle (CG) model was developed based on all-atom molecular dynamics simulation results, aiming at applying to deformation and fracture analyses of polycarbonate. After confirming the validity of the model, the developed CG model was applied to deformation analyses to investigate the effects of strain rate and multiaxial tension. The effect of strain rate was found to be consistent with an experiment. Two types of deformation behavior were observed according to the type of multiaxial tension.
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Lu, Fucong, Kun Zhang, Yuhang Hou, and Zhiwen Wu. "Investigation on Temperature-Dependent Multiaxial Ratchetting of Polycarbonate by a Novel Experimental Method." Advances in Materials Science and Engineering 2022 (May 13, 2022): 1–9. http://dx.doi.org/10.1155/2022/6577569.

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A novel method to heat the multiaxial hollow thin-wall specimen was proposed, where its gauge length section can be heated by the liquid (i.e., water) filled inside the specimen instead of the closed furnace. This method realizes the direct measurement of multiaxial strain on the surface of specimen at different temperatures by the noncontact digital image correlation. By utilizing the proposed method, the multiaxial stress-control cyclic tests were performed to investigate the multiaxial ratchetting of polycarbonate (PC) at different temperatures. It is found that the multiaxial ratchetting of PC depends greatly on the test temperatures and the multiaxial ratchetting strain increases with increasing the test temperature. The temperature-dependent multiaxial ratchetting is also influenced by valley stresses. The unrecoverable part of deformation in the multiaxial ratchetting strain increases with increasing temperature.
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Cazac, Alin Marian, Costică Bejinariu, Constantin Baciu, Stefan Lucian Toma, and Costel Dorel Florea. "Experimental Determination of Force and Deformation Stress in Nanostructuring Aluminum by Multiaxial Forging Method." Applied Mechanics and Materials 657 (October 2014): 137–41. http://dx.doi.org/10.4028/www.scientific.net/amm.657.137.

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This Paper Aims to Determine by Experiment Total Force and Stress of Deformation Depending on Punch Stroke and the Level of Deformation on Severe Plastic Deformation of Aluminum by Multiaxial Cold Forging. the Deformation Force in Multiaxial Forging Depends on a Number of Parameters of whom the most Important are: Strain, the Flow Force of Aluminum, Deformation Speed, the Friction between the Material and the Die, Shape and Size of Die, the Dimensions of Deform Profile, Shape and Dimensions of Workpiece, Temperature Variation during the Process, Physical and Mechanical Properties of the Workpiece Material, the Structural Inhomogeneity of Workpiece Material. the Deformation Process is Discontinuous and Includes Deformation Processes that Define a Cycle of Severe Plastic Deformation. this Paper Aims to Determine the Force and Stress Corresponding to the First 12 Cycles of Severe Plastic Deformation.
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Kang, Guo Zheng, and Yu Jie Liu. "Uniaxial and Multiaxial Cyclic Deformation Behaviors of SiCp/6061Al Alloy Composites." Key Engineering Materials 353-358 (September 2007): 1247–50. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1247.

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The uniaxial/multiaxial cyclic deformation behaviors of SiCp/6061Al alloy composites with various particulate volume fractions were studied by uniaxial and multiaxial cyclic straining or stressing tests at room temperature. The cyclic softening/hardening features and ratcheting behaviors of T6-treated composites and un-reinforced matrix were discussed in different loading conditions. It is shown that the ratcheting also occurs in the composites under uniaxial and multiaxial asymmetrical cyclic stressing, and the ratcheting strain increases with stress amplitude and mean stress; however, the addition of SiC particulates into the matrix increases the resistance of the composite to ratcheting. The ratcheting depends greatly on the shapes of loading paths and mainly occurs in the direction of non-zero mean stress.
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Karuskevych, M., T. Maslak, and L. Pejkowski. "Surface deformation relief features under multiaxial fatigue." Scientific journal of the Ternopil national technical university 96, no. 4 (2019): 45–50. http://dx.doi.org/10.33108/visnyk_tntu2019.04.045.

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Dissertations / Theses on the topic "Multiaxial deformation"

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Tomlinson, Philip S. "Multiaxial deformation of AZ80 magnesium alloy." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45362.

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The multiaxial deformation of magnesium alloys is important for developing reliable, robust models for both the forming of components and also analysis of in service performance of structures, for example, in the case of crash worthiness. This work presents a combination of unique biaxial experimental tests and biaxial crystal plasticity simulations using a visco-plastic self-consistent (VPSC) formulation conducted on AZ80 magnesium alloy in two different conditions - extruded and a more weakly textured as cast condition. The experiments were conducted on tubular samples which are loaded in axial tension or compression along the tube and with internal pressure to generate hoop stresses orthogonal to the axial direction. The results were analyzed in stress and strain space and also in terms of the evolution of crystallographic texture. In general, it was found that the VPSC simulations matched well with the experiments, particularly for the more weakly textured cast material. However, some differences were observed for cases where basal < a > slip and {10¯12} extension twinning were in close competition such as in the biaxial tension quadrant of the plastic potential. The evolution of texture measured experimentally and predicted from the VPSC simulations was qualitatively in good agreement. Finally, experiments and VPSC simulations were conducted in which samples of the extruded AZ80 material were subjected to a small uniaxial strain prior to biaxial loading in order to further explore the competition between basal slip and extension twinning.
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Hallett, Joseph F. "Multiaxial strength and fatigue of rubber compounds." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/6759.

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Despite real applications having complex triaxial loading, current physical test methods to predict component behaviour are mainly uniaxial. But previous work has indicated that there may be substantial differences between the rubber's uniaxial and biaxial behaviour and hence through incompressibility, its triaxial properties. In order to quantify these differences equipment was developed to assess the biaxial performance of selected rubber compounds using inflated circular diaphragms. Although allowing higher extensions than stretching a sheet in its own plane, such tests do not allow stress and strain to be measured directly, requiring careful marking of the sample, or calculation through simulation. On the grounds of perceived accuracy, the latter was chosen, requiring accurate, general, elastic constants to high extensions. In this thesis the development of this apparatus, along with the associated techniques is described, along with the development of a new elastic theory. The tests on this new apparatus indicated significant differences between the uniaxial and biaxial strength and fatigue of rubber. In a unimdal test natural rubber (NR) is much stronger than styrene butadiene rubber (SBR) below 35pphr of carbon black. In a biaxial test though the converse is true, although there is some evidence of crystallinity in NR during the biaxial test. Distinct differences were also found in fatigue between the two load cases. When plotted against extension ratio the biaxial life of SBR was found to increase, while the converse is true for NR. However if life is plotted against a function of strain energy, the biaxial life of both polymers increases for a given energy.
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Shamsaei, Nima. "Multiaxial Fatigue and Deformation Including Non-proportional Hardening and Variable Amplitude Loading Effects." University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1279760342.

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Wright, Lawrence William. "Creep deformation of CMSX-4 NBSCS during uniaxial and multiaxial loading at high temperature." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619709.

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Saadedine, Mahrez. "Micromécanique et macromécanique des matériaux souples renforcés par des nanoparticules inorganiques." Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILN045.

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Les nanomatériaux sont actuellement largement utilisés dans le domaine bio-médical et jouent un rôle crucial dans les stratégies modernes pour remédier aux dysfonctionnements des tissus souples naturels tels que les tendons, les ligaments et les disques intervertébraux. Par ailleurs, les progrès de la biomécanique sont étroitement liés à l'élaboration de nouveaux biomatériaux tout en répondant à certains besoins spécifiques. Au cours des dernières décennies, une attention toute particulière a été portée à la combinaison de la nanotechnologie à d'autres domaines scientifiques dans le but d'obtenir de nouveaux biomatériaux avancés. Les matériaux souples renforcés par des nanoparticules inorganiques sont un exemple d'une telle combinaison entre la nanotechnologie et la science des biomatériaux. Ces biomatériaux peuvent imiter les propriétés chimiques, mécaniques, électriques et biologiques des tissus naturels. La présente thèse aborde le problème de la représentation constitutive multi-échelle du comportement inélastique multiaxial des matériaux souples renforcés par des nanoparticules inorganiques. La principale réalisation de cette thèse concerne le développement d'un modèle entièrement tridimensionnel, dans le cadre d'un traitement micromécanique, pour analyser la rupture, la capacité d'auto-guérison et les mécanismes de renforcement des nanoparticules tout en tenant compte des effets environnementaux. La représentation constitutive du système matériau est traitée à l'aide d'une cellule unitaire cubique contenant neuf nanoparticules ; une nanoparticule centrale relie huit autres placées aux sommets du cube via un certain nombre de chaînes polymères afin de tenir compte du rôle effectif des nanoparticules sur le comportement macroscopique non linéaire en grandes transformations. Les interactions directes en champ proche entre les nanoparticules et le réseau de chaînes sont physiquement décrites à l'aide d'une transition d'échelle micro-macro dans le cadre de la théorie de l'inclusion d'Eshelby. Le modèle considère explicitement le réseau de chaînes ainsi que les mécanismes réversibles de détachement / ré-attachement des liaisons dynamiques pour décrire de manière cohérente l'extensibilité extrême dépendante de la vitesse de sollicitation et certaines caractéristiques inélastiques, notamment la forte hystérésis lors des phases d'étirement-rétraction et la relaxation continue. Une évaluation quantitative de notre modèle est présentée à l'aide de comparaisons à des données expérimentales disponibles pour une variété de systèmes matériaux nanocomposites contenant une large gamme de concentrations de nanoparticules et pour différents modes de déformation lors de séquences de chargement monotones et cycliques. Le modèle s'avère capable de reproduire avec succès les différentes caractéristiques de la réponse multiaxiale macroscopique. Il est enfin utilisé pour mettre en évidence certaines informations clés sur les mécanismes de renforcement des nanoparticules et leur rôle sur la dissipation multiaxiale, la rupture multiaxiale et la capacité d'auto-guérison à température ambiante tout en tenant compte des effets de gonflement
Nanomaterials are currently widely used in bio-applications and play a crucial role in modern strategies to remedy malfunctions of natural soft tissues such as tendons, ligaments and intervertebral discs. Besides, progress in biomechanics is closely related to the elaboration of new biomaterials tailored to suit certain specifications. The combination of nanotechnology with other fields of science has attracted increasing attention during the past decades to get improved biomaterials. Soft materials reinforced by inorganic nanoparticles are an example of such a combination between nanotechnology and biomaterial science. These biomaterials can mimic the chemical, mechanical, electrical, and biological properties of native tissues. The present PhD dissertation addresses the problem of the multiscale constitutive representation of the multiaxial inelastic behavior of soft materials reinforced by inorganic nanoparticles. The main achievement of this PhD concerns the development of a fully three-dimensional model within a micromechanical treatment to analyze the failure, the self-healing facility and the nanofiller reinforcement mechanisms considering the environmental effects. The material system is representatively regarded as a cubic unit cell containing nine nanoparticles; a central nanoparticle connects eight nanoparticles placed at the cube vertices via a number of polymer chains to account for the effective role of nanoparticles on the nonlinear and finite-strain macro-behavior. The near-field direct interactions between the nanoparticles and the chains network are physically described using a micro-macro scale transition within the Eshelby inclusion theory. The model explicitly considers the chains network with dynamic reversible detachable/re-attachable mechanisms of bonds to coherently capture the rate-dependent extreme stretchability and some inelastic features including strong hysteresis upon stretching-retraction and continuous relaxation. A quantitative evaluation of our model is presented by comparisons to available experimental data of a variety of nanocomposite material systems over a wide range of nanoparticle concentrations for different modes of deformation upon monotonic and cyclic loading sequences. The model is found being able to successfully reproduce the significant features of the multiaxial macro-response. It is finally used to highlight some important insights on the nanoparticle reinforcement mechanisms and their role on the multiaxial dissipation, multiaxial failure and room temperature self-healing facility considering the swelling effects
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Kraiem, Omar. "Comportement mécanique d’une mousse fragile. Application aux emballages de transport de matières dangereuses." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLN028/document.

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Les mousses fragiles font aujourd'hui partie des nouveaux matériaux très performants dont le procédé de fabrication permet un contrôle précis de la microstructure finale. De nouveaux débouchés apparaissent dans des applications structurales (absorption de choc, allègement des structures) en raison de leur excellente tenue mécanique alliée à une grande légèreté. Dans les travaux réalisés dans le cadre de cette thèse, une mousse carbone à cellules ouvertes a été étudiée dans le but d'être utilisée pour assurer la protection des capots de protection d'emballages. Le comportement mécanique en compression a été caractérisé sous des sollicitations uniaxiales et multiaxiales. La surface de charge de la mousse ainsi que son évolution au cours du chargement ont été identifiés. Les principales propriétés mécaniques ont été évaluées et certaines d'entre elles ont été corrélées avec celles prédites par le modèle micro-mécanique de Gibson et Ashby développé pour les mousses fragiles. Grâce aux observations post-mortem sous microscope électronique à balayage et en micro-tomographie aux rayons X, les mécanismes de déformation et d'absorption d'énergie ont été également caractérisés. Pour modéliser le comportement multiaxial en compression de la mousse carbone, considérée comme un milieu continu homogène et isotrope, le modèle de Deshpande et Fleck (DF) a été adopté et adapté. Ce modèle a été implanté dans le code éléments finis LS-DYNA. Il a été identifié et validé sur l'ensemble des essais triaxiaux disponibles ainsi que sur des essais d'écrasement de mini-structure. Le comportement macroscopique global, obtenu à l'aide de simulations numériques, est prédit de manière satisfaisante. Il sera amélioré par la suite pour prendre en compte certains aspects non décrits actuellement
Due to improvements in the manufacturing process that allow a better control of their microstructure, brittle foams are now part of the new efficient materials. New markets in the field of structural applications open up thanks to their excellent mechanical properties combined with light weight.In this study, a carbon foam with open cells has been studied in order to be used as shock absorber in packagings. Its compressive mechanical behavior has been characterized under various uniaxial and multiaxial loadings. The carbon foam yield surface and its evolution during loading have been identified. The main mechanical properties have been evaluated and some of them have been correlated with those predicted by the Gibson and Ashby micromechanical model. The mechanisms of deformation and the energy absorption have been studied using post-mortem observations by scanning electron microscopy (SEM) and X-Ray microtomography.The Deshpande and Fleck model (DF) has been adopted and slightly modified to model the compressive multiaxial behavior of the carbon foam. The latter is considered as an homogeneous continuum medium. The constitutive equations have been implemented in the finite element code LS-DYNA via a Umat routine. The model parameters have been identified and the model estimations validated on available triaxial tests as well as on crushing tests made on micro-structures. Numerical simulations are relevant on predicting the global macroscopic behavior. Nevertheless, the mechanical model needs to be improved to better account for some phenomena not currently described
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Tawana, Siyd S. "Behavior of plain and steel fiber reinforced concrete under multiaxial stress." Ohio : Ohio University, 1995. http://www.ohiolink.edu/etd/view.cgi?ohiou1178903105.

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Rial, Djihad. "Modélisation tridimensionnelle des flexibles hydroformés et tressés en statique et en fatigue." Electronic Thesis or Diss., Compiègne, 2015. http://www.theses.fr/2015COMP2184.

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Dans cette étude, le comportement mécanique des flexibles ondulés est étudié expérimentalement et numériquement. Afin de surmonter l’important coût de calcul, des solutions analytiques de la théorie des coques toriques ont été utilisées pour homogénéiser le comportement global en utilisant des poutres simples à propriétés équivalentes. Ensuite, le modèle analytique proposé a été vérifié en le comparant avec des modèles éléments finis en trois dimensions. Des essais expérimentaux ont été conçus pour étudier l’expansion sous pression et le comportement en flexion de ces structures. Il est démontré que lorsque le modèle est implémenté dans un code d’éléments finis, il donne des résultats acceptables avec une réduction considérable temps de calcul. D’autre part, l’importance de la prise en compte des contraintes résiduelles résultant de l’opération d’hydroformage a été montrée. Cette étude consiste aussi à simuler le comportement des tresses métalliques numériquement en utilisant différentes approches – une approche "micro-échelle" directe avec des éléments solides 3D ou des éléments de poutres pour chaque fil métallique, ainsi que des approches homogénéisées où des éléments finis continus sont utilisés pour représenter soit l’ensemble de la structure qui est le modèle "macro-échelle", soit chaque groupe de fils qui est le modèle "méso-échelle". Ces modèles sont comparés par la suite à des résultats expérimentaux, qui sont: un essai de traction simple et un essai d’expansion sous pression. Une investigation numérique et expérimentale de la tenue en fatigue des flexibles métalliques a été présenté. Des échantillons de flexibles ont été soumis à une série de tests de fatigue lors desquels l’amplitude de chargement mécanique était constante, avec une pression interne continuelle similaire aux conditions de travail. Sachant que ces configurations de chargements génèrent des contraintes (déformations) tridimensionnelles, la durée de vie de la structure a été extraite en termes de nombre de cycles à l’initiation de fissures (perte de pression interne). De plus, un modèle d’éléments finis a été créé en tenant en compte les contraintes résiduelles résultant du procédé d’hydroformage afin d’estimer et de comparer avec l’expérience la durée de vie en fatigue. Cette prédiction a été réalisée à l’aide de différentes approches : une approche contrainte-déformation qui est largement utilisée dans les codes commerciaux, une approche de plan critique, une approche énergétique et une approche basée sur le cumul d’endommagement
Hydroformed flexible tubes are essential structures used in several industrial sectors such as the automotive sector, the aviation industry or energy production, such as the production of renewable energy in solar thermal energy farms where the panels must both be supplying fluid along and follow the direction of the sun. These structures serve as connecting parts between the rigid parts different mechanisms, primarily used for damping vibrations and acoustic emissions, and, as their name suggests, they also allow flexibility and pressure expansion, which considerably improves the fatigue strength. The mastery and prediction of the mechanical behavior of these structures are very important from a safety point of view and an economic point of view. Indeed, their accidental breakage can cause very serious consequences due to their use in sensitive areas such as the nuclear industry. In this context, this thesis was launched between Compiegne University of Technology and industrial BOA-group to create digital approaches to behavioral predictions and estimating the life braided hoses that take into account extreme conditions (temperature and pressure) and the forming parameters and properties of the materials used. In terms of use, these products are subject to thermomechanical charge-discharge cycles and vibrations can induce complex deformed piping of wear due to friction and damage by fatigue, The purpose of the study is to develop a numerical approach validated by the experience to certify products and improve the design. This approach will allow to estimate the lifetime of braided wavy taking into account: - the initial state of the product after forming and assembly, - thermomechanical stresses, is defined by the specification, or encountered in specific use cases, - vibrations encountered during use in real cases. The expected results are the life of the products from a calculation model of their behavior using the characteristics of the materials and interaction braid / tube
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江武駿. "Endochronic Theory For Rate-Depenent Elasto-Plastic Deformation Under Multiaxial Loading." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/41732710939164325016.

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Li, Dan. "Mathematical models of an elastomeric material for non-uniform and multiaxial deformation conditions." Thesis, 2005. http://hdl.handle.net/2429/16297.

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The goal of this research project is to develop mathematical constitutive models to predict the stable mechanical behaviour of elastomeric materials for non-uniform and/or multiaxial deformation conditions at low or medium strain (<100%) and with a low strain rate. This study required a series of characterization tests for elastomers in standard deformations modes. These experimental data were used to fit the standard Mooney- Rivlin strain energy function. A series of characterization tests for a silicone elastomer were completed at UBC and correlated to material characterization data provided by Ballard Power Systems, Inc. The experimental data showed that material response changes with the maximum strain experienced and deformation mode. The material constants in the Mooney-Rivlin strain energy function were fitted by regression analysis according to the results of the characterization tests. For each individual strain level and deformation mode, the resulting material constants are unique. A constitutive model was developed by applying the standard Mooney-Rivlin constitutive model with novel techniques incorporating the maximum strain experienced and the deformation mode. The techniques are a non-uniform strain and a strain partitioning technique. The non-uniform strain technique was expected to give better results for a component experiencing non-uniform strain conditions. The strain partitioning technique eliminates the need of determining the deformation mode before an analysis. Together, these techniques were expected to provide more realistic deformation predictions for elastomeric materials experiencing non-uniform and multiaxial deformation. Two mechanical tests were designed to provide the data necessary to validate the non-uniform strain and strain partitioning techniques. The first test, a tapered dogbone sample, exhibited varying amounts of uniaxial tension deformation within the gauge-length area, when stretched. The second test, a cross sample, exhibited varying multiaxial deformations when loaded in two perpendicular directions with different amounts of displacements. The predictions from the mechanical models incorporating the proposed constitutive models as an input agree with experimental data in these two tests, which validates the applicability of the proposed techniques. These techniques will aid in understanding the stable response of elastomeric materials used for seals in fuel cells. Developing an improved understanding of the deformation response will help in predicting seal integrity and improve the overall reliability of PEM fuel cells.
Applied Science, Faculty of
Materials Engineering, Department of
Graduate
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Books on the topic "Multiaxial deformation"

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Kalluri, S., and PJ Bonacuse, eds. Multiaxial Fatigue and Deformation Testing Techniques. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 1997. http://dx.doi.org/10.1520/stp1280-eb.

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Sreeramesh, Kalluri, and Bonacuse Peter J. 1960-, eds. Multiaxial fatigue and deformation testing techniques. W. Conshohocken, Penn: ASTM, 1997.

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Kalluri, S., and PJ Bonacuse, eds. Multiaxial Fatigue and Deformation: Testing and Prediction. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2000. http://dx.doi.org/10.1520/stp1387-eb.

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Sreeramesh, Kalluri, Bonacuse Peter J. 1960-, and Symposium on Multiaxial Fatigue and Deformation: Testing and Prediction (1999 : Seattle, Wash.), eds. Multiaxial fatigue and deformation: Testing and prediction. W. Conshohocken, PA: ASTM, 2000.

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Eberhardshtayner, Yozef, Sergey Leonovich, and Valentin Dorkin. Design models of structural building materials under multiaxial stress. ru: INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/1082947.

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The monograph presents the results of experimental and theoretical studies of the behavior of wood and concrete of various structures under biaxial and triaxial compression. It contains a systematic classification of existing models for concrete that link three-axis nonlinear elastic stresses and deformations, as well as research and subsequent evaluation of some basic models from the point of view of their possible use in the framework of spatial load analysis using FEM. It is intended for scientific and engineering workers of research and design organizations.
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Wash.) Symposium on Multiaxial Fatigue and Deformation: Testing and Prediction (1999 : Seattle. Multiaxial Fatigue and Deformation: Testing and Prediction (A S T M Special Technical Publication.//Stp, 1387) (Astm Special Technical Publication// Stp). Astm International, 2000.

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Manson, S. S., and G. R. Halford. Fatigue and Durability of Metals at High Temperatures. ASM International, 2009. http://dx.doi.org/10.31399/asm.tb.fdmht.9781627083430.

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Fatigue and Durability of Metals at High Temperatures is a repository of knowledge, experience, and insights on high-temperature fatigue and its effect on component lifetime and failure. The first few chapters provide readers with an intuitive understanding of creep and creep-fatigue and how they progress based on time, temperature, and stress. In subsequent chapters, the authors present several fatigue life prediction techniques, comparing them to each other and to experimental test results. The authors focus on a method called strain-range partitioning that breaks stress-strain hysteresis loops into simpler components, the effects of which can be analyzed more easily. Through detailed examples, they show how strain-range partitioning can account for creep-fatigue interactions, multiaxial stresses and strains, temperature gradients, metallurgical and microstructural changes, thermal fatigue, and damage mitigation or “healing” due to sequential loading. The method is also used to examine the cyclic deformation characteristics of various steels and alloys and the obstacles to achieving high-temperature structural durability with fiber-reinforced metal-matrix composites. For information on the print version, ISBN 978-0-87170-718-5, follow this link.
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Book chapters on the topic "Multiaxial deformation"

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Murakami, S., Y. Kanagawa, T. Ishida, and E. Tsushima. "Inelastic Deformation and Fatigue Damage of Composite under Multiaxial Loading." In Inelastic Deformation of Composite Materials, 675–94. New York, NY: Springer New York, 1991. http://dx.doi.org/10.1007/978-1-4613-9109-8_33.

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Webster, G. A. "Determination of Multiaxial Stress Creep Deformation and Rupture Criteria." In Harmonisation of Testing Practice for High Temperature Materials, 289–93. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2888-9_14.

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Windelband, B., B. Schinke, and D. Munz. "Cyclic Deformation and Crack Initiation in Tubes Under Multiaxial Loading." In Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials—3, 304–10. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2860-5_50.

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Kang, Guo Zheng, and Yu Jie Liu. "Uniaxial and Multiaxial Cyclic Deformation Behaviors of SiCp/6061Al Alloy Composites." In Key Engineering Materials, 1247–50. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.1247.

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Ziebs, Josef, Jürgen Meersmann, Hans-Joachim Kühn, and Siegmar Ledworuski. "High Temperature Inelastic Deformation of in 738 LC Under Uniaxial and Multiaxial Loading." In Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials—3, 248–55. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2860-5_41.

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Zeng, Chongyang, and Xiangfan Fang. "Deformation and Failure Behavior of Steel Under High Strain Rate and Multiaxial Loading." In The Minerals, Metals & Materials Series, 445–55. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06212-4_41.

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Sweeney, J., and I. M. Ward. "The Application of Hyperelastic and Rate Dependent Models to the Multiaxial Deformation of Polymers." In Solid Mechanics and Its Applications, 115–20. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8494-4_16.

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Özkaya, Nihat, Margareta Nordin, David Goldsheyder, and Dawn Leger. "Multiaxial Deformations and Stress Analyses." In Fundamentals of Biomechanics, 189–219. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-1150-5_14.

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Özkaya, Nihat, Dawn Leger, David Goldsheyder, and Margareta Nordin. "Multiaxial Deformations and Stress Analyses." In Fundamentals of Biomechanics, 317–60. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-44738-4_14.

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Özkaya, Nihat, and Margareta Nordin. "Multiaxial Deformations and Stress Analyses." In Fundamentals of Biomechanics, 153–94. New York, NY: Springer New York, 1999. http://dx.doi.org/10.1007/978-1-4757-3067-8_8.

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Conference papers on the topic "Multiaxial deformation"

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GHAZIMORADI, MEHDI, VALTER CARVELLI, and JOHN MONTESANO. "ASSESSING THE MULTIAXIAL DEFORMATION RESPONSE OF UNIDIRECTIONAL NON-CRIMP FABRICS." In Thirty-sixth Technical Conference. Destech Publications, Inc., 2021. http://dx.doi.org/10.12783/asc36/35914.

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In this study, the mixed-mode deformation response of a unidirectional non- crimp fabric (UD-NCF) was investigated. Multiaxial in-plane shear-biaxial tension tests were performed using a new multi-branched fabric specimen on a custom multi-axial loading device. Tests were performed with various ratios of deformation along three loading directions to impose combined tension and shear deformation on the fabric specimens. The different loading cases revealed a strong inter-dependency between shear and tensile deformation modes. Observation and measurement of local deformations provided important quantitative and qualitative information to deeply understand the interaction of typical meso- and macro-scale deformations, which can be leveraged during the forming process of liquid composite molded components to reduce shear-induced defects such as wrinkling.
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Kurath, Peter, and Jason Howard Jones. "Multiaxial Thermomechanical Deformation Utilizing a Non-Unified Plasticity Model." In SAE 2000 World Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-0782.

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Sun, Xingyue, Ruisi Xing, and Xu Chen. "Multiaxial Ratcheting Deformation of 316LN Stainless Steel at Elevated Temperatures." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21209.

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Abstract 316LN stainless steel is the main material used in the primary pipelines of the pressurized water reactor due to its excellent characteristics. In the consideration of its serious environment, the cyclic deformation of material at high temperatures is concerned. A series of multiaxial ratcheting experiments were conducted at room, 350°C and 550°C. These experiments contained circular, rhombus and uniaxial loading paths with different mean stresses and stress amplitudes. At elevated temperature conditions, it got quick shakedown in multiaxial cases which is similar in uniaxial ones indicating that dynamic strain aging (DSA) exists. Uniaxial strain was the maximum in all the test temperature. Mean stress is seemed to be always the main influence factor. The difference of ratcheting strain under rhombus path and circular path decreased from room temperature to elevated temperature, which is inferred that DSA effect may weakened the nonproportionality at elevated temperature. The ratcheting strain evolution was simulated by Chen-Jiao-Kim model with the multiaxial parameter associated with temperature.
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Basoalto, H. C., R. N. Ghosh, M. G. Ardakani, B. A. Shollock, and M. McLean. "Multiaxial Creep Deformation of Single Crystal Superalloys: Modelling and Validation." In Superalloys. TMS, 2000. http://dx.doi.org/10.7449/2000/superalloys_2000_515_524.

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Gao, Qing, Zhi Shi, Guozheng Kang, and Yujie Liu. "Multiaxial Time-Dependent Cyclic Deformation of Stainless Steel at High Temperatures." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93300.

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The multiaxial time-dependent cyclic deformation behavior of stainless steel (i.e., 1Cr18Ni9) was studied experimentally at 250 °C and 700 °C. In the tests, the strain cyclic characteristics and ratcheting behavior of the material were observed under multiaxial cyclic straining/stressing at different loading rates and with various hold-times and non-proportional loading paths. The results show that the cyclic deformation behavior of the material is significantly influenced by the non-proportional loading paths and present apparent time dependence, especially at 700°C. Some significant conclusions useful for the design and assessment of pipe structures in nuclear engineering are obtained.
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Khraisheh, Marwan K. "Constitutive Modeling of Multiaxial Deformation and Induced Anisotropy in Superplastic Materials." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1196.

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Abstract The multiaxial deformation of superplastic materials is modeled within a continuum theory of viscoplasticity using a generalized anisotropic dynamic yield function. The anisotropic dynamic yield function is capable of describing the evolution of the initial anisotropic state of the yield potential through the evolution of unit vectors defining the direction of anisotropy. The evolution of the direction of anisotropy is represented by a constitutive spin such that initially it is identical to the Eulerian spin and as deformation continues, it tends towards an orthotropic spin. Experiments on the model Pb-Sn alloy were conducted and used to calibrate and verify the constructed model. It is shown that the model in conjunction with the anisotropic dynamic yield function is capable of predicting the actual trend of the induced axial stresses recorded in fixed-end torsion experiments.
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Ahmad, Jalees, Golam M. Newaz, and Theodore Nicholas. "Prediction of Metal Matrix Composite Response to Multiaxial Stresses." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0359.

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Abstract A theory is presented which can be used in stress analysis of metal matrix composite in the inelastic range and under multiaxial stress states. Theoretical predictions of composite deformation and damage under various stress states have been experimentally validated. The theory has been incorporated in a finite element analysis framework so that practical design problems can be addressed.
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Roos, Eberhard, Xaver Schuler, and Ludwig Stumpfrock. "Numerical Evaluation of Ratchetting Effects on the Deformation and Failure Behaviour of Components." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77245.

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Within a recent project of German reactor safety research an existing phenomenological material model was improved and verified. The material model allows to simulate numerically the complex procedures during multiaxial and cyclic load in a component. The model makes the simulation for in-phase and out-of-phase loads possible. Parallel to the theoretical work experimental investigations were accomplished. With the experimental data on the one hand the parameter necessary for the material model are determined. On the other hand experiments supply a database from thin-walled hollow cylinders with multiaxial load for the verification of the implementation of the material model to a finite element programme. Good coincidence between measured data and simulation could be achieved in most cases. In some cases the simulation overestimates the measured data. With respect to a safety assessment of components, therefore, the simulation gives conservative results.
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Ahmad, Jalees, and Theodore Nicholas. "Modeling of Inelastic Metal Matrix Composite Response Under Multiaxial Loading." In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0487.

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Abstract A mechanistic framework is proposed which may facilitate establishment of inelastic deformation surfaces (analogous to yield surface for metals) and flow-rules for some composites. The motivation is to develop a method for three dimensional stress analysis of composites in the nonlinear regime.
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Kontermann, Christian, Alexander Erbe, Fabian Conrad, Karl Michael Kraemer, and Matthias Oechsner. "Deformation and Damage Behavior of a 1 Cr-Cast Steel Under Multiaxial Loading at Elevated Temperatures." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82885.

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Abstract Rising demands on material performance at high temperature in components under complex loading such as steam- and gas turbine housings require an increase in versatility and precision of component life modelling approaches. However, the database to calibrate those models is commonly derived from uniaxial testing. The impact of multiaxial loading, both proportional and non-proportional, is usually addressed theoretically by the use of equivalent stress/strain formulations or reduction ratios derived from few specific validation tests. Therefore, a research program which systematically investigates the fatigue life of a 1Cr-cast steel both experimentally and theoretically has been initiated recently. For the experimental part, cruciform specimens are tested in a servo-hydraulic biaxial test rig equipped with an induction heating device. Each experiment is accompanied with finite element simulations before and after the test to parametrize the loading condition and derive equivalent loading parameters at hot-spot locations. When assessing cycles until crack initiation in the experiments using the von Mises equivalent strain range, a reoccurring sequence in the impact of the axis ratio can be observed. Beside the fatigue life in terms of cycles to crack initiation, the multiaxial loading conditions may also affect the deformation behaviour, in detail cyclic softening. Such effects are discussed by comparing the produced experimental evidence with results gained from a unified constitutive material model. Furthermore, different lifetime parameters are applied in order to judge their accuracy and suitability for design applications.
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Reports on the topic "Multiaxial deformation"

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Lu, Wei-Yang. Small-Scale Multiaxial Deformation Experiments on Solder for High-Fidelity Model Development. Office of Scientific and Technical Information (OSTI), December 2002. http://dx.doi.org/10.2172/811190.

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Ding, J. L., K. C. Liu, and C. R. Brinkman. Multiaxial deformation and life prediction model and experimental data for advanced silicon nitride ceramics. Office of Scientific and Technical Information (OSTI), June 1993. http://dx.doi.org/10.2172/10162954.

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Earthman, J. C., and F. A. Mohamed. Mechanisms of high temperature deformation and rupture under multiaxial loading conditions. Final progress report, July 1, 1996--June 30, 1997. Office of Scientific and Technical Information (OSTI), October 1997. http://dx.doi.org/10.2172/639762.

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Messner, M. C., and T. L. Sham. Development of a multiaxial deformation measure and creep-fatigue damage summation for multiple load cycle types in support of an improved creep-fatigue design method. Office of Scientific and Technical Information (OSTI), June 2019. http://dx.doi.org/10.2172/1601810.

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