Готові списки джерел за темами / Strength anisotropy

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Добірка наукової літератури з теми "Strength anisotropy"

Автор: Grafiati
Опубліковано: 19 жовтня 2024

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Статті в журналах з теми "Strength anisotropy"

1

Guo, Songfeng, Shengwen Qi, Bowen Zheng, Lei Xue, Xueliang Wang, Ning Liang, Yu Zou, et al. "The Confinement-Affected Strength Variety of Anisotropic Rock Mass." Materials 15, no. 23 (November 27, 2022): 8444. http://dx.doi.org/10.3390/ma15238444.

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It has been recognized that the anisotropic structures dominate the deformation and strength properties of laminated rock masses. The resultant strength anisotropy is strongly affected by confining pressures beyond anisotropic structures. Nevertheless, the effects of confinement are inconsistent among existing experiments and not fully understood. This study focuses on the effects of confining pressure on strength anisotropy through theoretical derivation together with experimental results analysis. The variations in the possibility of anisotropic structural plane dominant failure and strength anisotropy degree under different confining pressures are discussed. The different types of anisotropic structural planes, i.e., the fresh contact discontinuity or soft, thick layer, are found as the key factor resulting in different confinement effects. The strength anisotropy weakens gradually and vanishes eventually as confining stress increases for the anisotropic rock mass with the structural plane of fresh contact discontinuity. On the other hand, the strength does not vanish at very high confining stress and the anisotropic strength difference even rises as confining stress increases for the anisotropic rock mass with the anisotropic structural plane of the soft layer. This study improves the understanding of anisotropic rock mass mechanical behavior, especially at high confining stress, and may promote the development of excavation and supporting techniques for underground projects.
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2

Reid, D., R. Fanni, and A. Fourie. "Assessing the undrained strength cross-anisotropy of three tailings types." Géotechnique Letters 12, no. 1 (March 2022): 1–7. http://dx.doi.org/10.1680/jgele.21.00094.

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The cross-anisotropic nature of soil strength has been studied and documented for decades, including the increased propensity for cross-anisotropy in layered materials. However, current engineering practice for tailings storage facilities (TSFs) does not appear to generally include cross-anisotropy considerations in the development of shear strengths. This is despite the very commonly seen layering profile in subaerially deposited tailings. To provide additional data to highlight the strength cross-anisotropy of tailings, high-quality block samples from three TSFs were obtained and trimmed to enable hollow cylinder torsional shear tests to be sheared at principal stress angles of 0 and 45° during undrained shearing. The consolidation procedures were carried out such that the drained rotation of principal stress angle that would precede potential undrained shear events for below-slope tailings was reasonably simulated. The results indicated the significant effects of cross-anisotropy on the undrained strength, instability stress ratio, contractive tendency and brittleness of each of the three tailings types. The magnitude of cross-anisotropy effects seen was generally consistent with previous published data on sands.
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3

Cheng, Jingyi, Zhijun Wan, Yidong Zhang, Wenfeng Li, Syd S. Peng, and Peng Zhang. "Experimental Study on Anisotropic Strength and Deformation Behavior of a Coal Measure Shale under Room Dried and Water Saturated Conditions." Shock and Vibration 2015 (2015): 1–13. http://dx.doi.org/10.1155/2015/290293.

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This paper presents an experimental investigation of anisotropic strength and deformation behavior of coal measure shale. The effect of two factors (i.e., anisotropy and water content) on shale strength and deformation behavior was studied. A series of uniaxial and triaxial compression tests were conducted on both room dried and water saturated samples for different lamination angles. The test results indicate that (1) the compressive strength, cohesion, internal friction angle, tangent Young’s modulus, and axial strain corresponding to the peak and residual strengths of room dried specimens exhibit anisotropic behavior that strongly depends on the orientation angle(β); (2) in comparison to the room dried samples, the compressive strength and Young’s modulus as well as the anisotropy are all reduced for water saturated specimens; and (3) the failure mechanism of the samples can be summarized into two categories: sliding along lamination and shearing of rock material, with the type occurring in a particular situation depending strongly on the lamination orientation angles with respect to the major principal stress. According to the findings, it is strongly recommended that the effect of anisotropy and water content on the strength and deformation behavior of the rock must be considered in ground control designs.
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4

Lai, Van Qui, Jim Shiau, Suraparb Keawsawasvong, Sorawit Seehavong, and Lowell Tan Cabangon. "Undrained Stability of Unsupported Rectangular Excavations: Anisotropy and Non-Homogeneity in 3D." Buildings 12, no. 9 (September 10, 2022): 1425. http://dx.doi.org/10.3390/buildings12091425.

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The stability of unsupported rectangular excavations in undrained clay is examined under the influence of anisotropy and heterogeneity using the three-dimensional finite element upper and lower bound limit analysis with the Anisotropic Undrained Shear (AUS) failure criterion. Three anisotropic undrained shear strengths are considered in the study, namely triaxial compression, triaxial extension, and direct simple shear. Special considerations are given to the study of the linearly-increased anisotropic shear strengths with depth. The numerical solutions are presented by an undrained stability number that is a function of four dimensionless parameters, i.e., the excavated depth ratio, the aspect ratio of the excavated site, the shear strength gradient ratio, and the anisotropic strength ratio. To the authors’ best knowledge, this is the first of its kind to present the stability solutions of 3D excavation considering soil anisotropy and heterogeneity. As such, this paper introduces a novel approach for predicting the stability of unsupported rectangular excavation in undrained clays in 3D space, accounting for soil anisotropy and non-homogeneity. Notably, it develops a basis to formulate a mathematical equation and design charts for estimating the stability factor of such type of excavation, which should be of great interest to engineering practitioners.
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5

Jena, Pradipta Kumar, K. Siva Kumar, and A. K. Singh. "Effect of Tempering Temperature on Microstructure, Texture and Mechanical Properties of a High Strength Steel." International Journal of Manufacturing, Materials, and Mechanical Engineering 4, no. 3 (July 2014): 33–49. http://dx.doi.org/10.4018/ijmmme.2014070102.

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This work describes the microstructure, texture and anisotropy in mechanical behavior of a high strength steel in various tempered conditions. The microstructures and mechanical properties change considerably with varying tempering temperatures. The material exhibits low in-plane anisotropy and low anisotropic index in terms of yield strength and elongation with increase in tempering temperature. The anisotropy of the material displays similar behavior to that of the yield strength.
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6

Lee, K. M., and R. K. Rowe. "Effects of undrained strength anisotropy on surface subsidences induced by the construction of shallow tunnels." Canadian Geotechnical Journal 26, no. 2 (May 1, 1989): 279–91. http://dx.doi.org/10.1139/t89-037.

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The implementation of an anisotropic soil model that allows consideration of the variation of undrained strength due to anisotropy is described. This analysis is then used to identify the significance of strength anisotropy on the prediction of deformation behaviour of a shallow tunnel. It is found that, for the case of an unlined tunnel, attention should be given to the effect of strength anisotropy particularly for a soil possessing type "K" anisotropy (i.e., where the smallest undrained strength occurs at an angle θ other than the vertical or the horizontal, and the smallest value usually occurs at θ = 45°). On the other hand, for a lined tunnel, the effect of strength anisotropy upon the surface settlement profile will depend upon the size of a so-called "gap" parameter. The gap represents the net effect of loss of ground and some "workmanship" factors in a plane strain finite element analysis. Increasing the gap eases the restrictions imposed by the tunnel lining upon possible soil deformations, thereby increasing the effect of strength anisotropy. However, it is shown that for a lined tunnel with a moderate value of gap, detailed consideration of strength anisotropy may not be necessary. Key words: strength anisotropy, tunnelling, predictions, surface subsidences, finite element method, soil model, soft clays, vane strength.
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7

Seki, Hironori, Masakazu Tane, and Hideo Nakajima. "Fatigue Strength of Lotus-Type Porous Magnesium." Materials Science Forum 561-565 (October 2007): 1681–84. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.1681.

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We studied the fatigue strength of lotus-type porous magnesium with cylindrical pores aligned unidirectionally, which was fabricated through unidirectional solidification in pressurized hydrogen atmospheres. The fatigue strength shows anisotropy; the fatigue strength in the direction parallel to the longitudinal axis of pores is higher than that in the perpendicular direction. Not only anisotropic pores but also fiber texture grown along the pore direction contributes to the anisotropy in the fatigue strength.
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8

Watson, Julian Matthew, Abouzar Vakili, and Mateusz Jakubowski. "Rock Strength Anisotropy in High Stress Conditions: A Case Study for Application to Shaft Stability Assessments." Studia Geotechnica et Mechanica 37, no. 1 (March 1, 2015): 115–25. http://dx.doi.org/10.1515/sgem-2015-0013.

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Abstract Although rock strength anisotropy is a well-known phenomenon in rock mechanics, its impact on geotechnical design is often ignored or underestimated. This paper explores the concept of anisotropy in a high stress environment using an improved unified constitutive model (IUCM), which can account for more complex failure mechanisms. The IUCM is used to better understand the typical responses of anisotropic rocks to underground mining. This study applies the IUCM to a proposed rock shaft located in high stress/anisotropic conditions. Results suggest that the effect of rock strength anisotropy must be taken into consideration when assessing the rock mass response to mining in high stress and anisotropic rock conditions.
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9

Zapata-Medina, David G., Leon D. Cortes-Garcia, Richard J. Finno, and Luis G. Arboleda-Monsalve. "Stiffness and strength anisotropy of overconsolidated Bootlegger Cove clays." Canadian Geotechnical Journal 57, no. 11 (November 2020): 1652–63. http://dx.doi.org/10.1139/cgj-2019-0068.

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This paper presents the evaluation of the stiffness and strength anisotropy of overconsolidated (OC) Bootlegger Cove Formation (BCF) clays at the Port of Alaska, formerly known as the Port of Anchorage. The stiffness and strength anisotropic material response was evaluated based on triaxial samples equipped with internal instrumentation including a submersible load cell and three subminiature linear variable displacement transducers (LVDTs). Three sets of bender elements were used in this research to measure shear wave velocities for different propagation and polarization directions. The effects of reproducing the stress history of the soil deposit on the stiffness cross-anisotropic behavior of the material are discussed. The laboratory test results are compared with in situ measurements of shear wave velocities based on suspension logging and crosshole and downhole soundings. The results of the experimental program showed that BCF clay is a cross-anisotropic material. Mean stiffness anisotropy ratios ranged from 0.90 to 1.22 and 0.93 to 1.46 for lightly OC and OC conditions, respectively. Strength anisotropy ratios, defined as the ratio of undrained shear strength under triaxial extension to compression, varied between 0.8 and 0.5. It is found that reproducing the stress history of the OC soil deposit during the laboratory reconsolidation stage did not have a significant impact on the initial stiffness anisotropy ratios of the BCF clay.
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10

Shesterikov, S. A., A. M. Lokochtchenko, and E. A. Mjakotin. "Creep Rupture of Anisotropic Pipes." Journal of Pressure Vessel Technology 120, no. 3 (August 1, 1998): 223–25. http://dx.doi.org/10.1115/1.2842049.

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The problem of creep rupture of pipes from an anisotropic material is studied. The authors suggest a method describing the results of creep rupture tests on thin-walled pipes under complex stress state by taking the strength anisotropy of material into account. A coefficient of strength anisotropy has been determined from the results of creep rupture testing, and a method is given for calculation under various modes of complex stress state. This procedure is based on evaluating the values of the statistical spread from the experimental data. The anisotropy coefficient corresponding to the minimum spread is adopted. The suggested method of calculating the strength anisotropy coefficient is confirmed experimentally.
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Дисертації з теми "Strength anisotropy"

1

O'Neill, Deirdre A. (Deirdre Anne). "Undrained strength anisotropy of an overconsolidated thixotropic clay." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14634.

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2

Denli, Alper Kaan. "Effect Of Discontinuity Roughness And Anisotropy On Shear Strength." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12604948/index.pdf.

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Discontinuity surfaces generally consist of undulations termed as roughness. It is well known that surface roughness plays an important role on the shear strength and shear behavior of discontinuities. However, the effect of roughness will not be the same when the direction of shearing changes. This effect causes variation of shear strength with shearing direction or in other words anisotropy on shear strength. In this thesis, an experimental study was performed to investigate the effect of roughness and anisotropy on shear strength. For this purpose, joint samples were prepared using a model material and direct shear tests were conducted at different normal stress levels and shearing directions.
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3

Modén, Carl. "Transverse anisotropy in softwoods : modelling and experiments /." Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3988.

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Tong, Chong-Sze. "Anisotropy in repulsion and dispersion forces between atoms in molecules." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278386.

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Catapano, Anita. "Stiffness and strength optimisation of the anisotropy distribution for laminated structures." Paris 6, 2013. http://www.theses.fr/2013PA066062.

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Cette thèse porte sur le développement d’une nouvelle stratégie pour l’analyse et la conception optimale de structures anisotropes par rapport à la rigidité et à la résistance. Nous considérons des structures avec une géométrie donné et caractérisés par un champ de rigidité et de résistance anisotropes et variables. Le travail a été divisé en trois parties. Dans la première partie nous présentons les différents concepts et instruments utilisé pour développer la recherche. Dans la deuxième partie nous proposons une formulation invariante, à travers la méthode polaire, de différents critères de rupture polynomiaux pour matériaux orthotropes. Apres, nous considérons le problème de déterminer l’orientation optimale de plis orthotropes pour maximiser leur résistance. Dans la dernière partie nous abordons le problème de la conception optimale de structures stratifiés. Notre approche est inspiré par une stratégie à deux étapes déjà existent pour la seule maximisation de la rigidité. Avant tout nous avons défini un nouveau critère de rupture valide pour un stratifié modelé comme une plaque homogène équivalente et après, conscientes d’avoir deux fonctionnels à minimiser, l’énergie complémentaire et le failure index du critère développé, nous avons formalisé le problème à travers une minimisation séquentielle de deux fonctionnels. Dans la première étape de la stratégie nous avons développé trois algorithmes pour déterminer la distribution optimale des paramètres matériaux d’une structure donnée. Dans la deuxième étape nous avons résolu le problème de déterminer un empilement adapte à la distribution optimale des paramètres trouvé à l’étape précédente
In this thesis we deal with the problem of determining the best distribution of the anisotropy for a laminated structure that has to be simultaneously the stiffest and the strongest one. The work has been divided into three main parts. In the first part we presented all the concepts and tools that we have used to develop the research. In the second part we have proposed a tensor invariant formulation, through the polar method, of different polynomial failure criteria for orthotropic sheets. Then, we considered the problem of determining the optimal material orientation to maximise strength by the minimisation of the failure index. The last part of the thesis is dedicated to the development of a new strategy to optimise simultaneously the stiffness and strength of a laminated structure. Our approach is inspired from an already existing hierarchical strategy for the only stiffness maximisation. First of all we defined a new laminate level failure criterion valid for an equivalent homogenised plate. Then, conscious of having two functional, the complementary energy and the laminate failure index, to be minimised at the same time, we proved that the first step of the strategy can be stated as two problems characterised by two functional that are sequentially minimised, preserving only the orthotropy direction. In the first step of the strategy we developed three different algorithms to determine the optimal distribution of material parameters for a given structure. Finally we dealt with the problem of determining the laminate stacking sequence satisfying the optimal distribution of material parameters issued from the first step of the hierarchical strategy
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Wang, Wenhai Zavaliangos Antonios. "Towards an improved understanding of strength and anisotropy of cold compacted powder /." Philadelphia, Pa. : Drexel University, 2007. http://hdl.handle.net/1860/1865.

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Galen, Steven Zavaliangos Antonios. "Path dependence and strength anisotropy of mechanical behavior in cold-compacted powders /." Philadelphia, Pa. : Drexel University, 2005. http://dspace.library.drexel.edu/handle/1860/438.

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Zdravkovic, Lidija. "The stress-strain-strength anisotropy of a granular medium under general stress conditions." Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/8919.

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Ho, Man Lee. "Theoretical approach to quantify influence of inherent anisotropy on undrained steady state strength of sand /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202005%20HO.

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Kurauchi, Martim Hideki Nakayama. "Uma abordagem de ensaio de resistência mecânica de carvão vegetal." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-28042015-110831/.

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A indústria de ferro e aço corresponde a cerca de 8% das emissões globais de CO2. O carvão vegetal é uma alternativa existente ao uso de carvão fóssil e coque na indústria metalúrgica e é utilizado em alguns altos fornos no Brasil. Embora possua algumas vantagens em termos de maior reatividade e menor teor de cinzas em relação ao coque, o carvão vegetal possui baixa resistência mecânica e alta friabilidade, dificultando o transporte, manuseio e os processos. Não existem normas para avaliar a resistência à compressão de carvão vegetal, e os métodos existentes empregados em outras pesquisas consistem em preparar corpos de prova livres de defeitos e comprimi-los na direção das fibras. Por se tratar de um material com formato irregular, granular e anisotrópico, estes ensaios podem não revelar o comportamento de um leito de carvão vegetal, como um todo, quando sujeito a cargas compressivas. Isto pode não representar condições industriais, onde a carga sobre o carvão não é aplicada exclusivamente na direção das fibras, mas é aplicada de maneira aleatória. Esta dissertação propõe uma abordagem para se quantificar os efeitos da aplicação de cargas compressivas sobre um leito de carvão vegetal distribuído aleatoriamente. Isto representa uma tentativa de simular condições mais próximas das industriais, como ocorreria em um alto forno, em vez de fazer a análise de pedaços individuais de carvão. Foi montado um aparato consistindo em um tubo contendo um leito de carvão e com um êmbolo empurrado por máquina de ensaio universal. As experiências consistem em utilizar o aparato para realizar repetições de ensaios de compressão de carvão de tamanho inicial controlado. Assim, é obtida uma distribuição granulométrica em função da carga aplicada, que é classificada por peneiramento e pesagem. A partir disto, a distribuição granulométrica é analisada de forma qualitativa e quantitativa com uso de ferramentas estatísticas. Através dos índices de quebra e sobrevivência, o método produz resultados reprodutíveis com número de repetições suficiente. Desta forma, é possível prever o comportamento de um leito de carvão vegetal sob compressão.
The iron- and steel industry is responsible for about 8% of the total global CO2 emissions. Charcoal is an existing alternative to the use of coal and coke in the metallurgical industry and is used in some blast furnaces in Brazil. Although it has some advantages against coke in terms of higher reactivity and lower ash contents, charcoal has inherently low mechanical strength and high friability, imposing difficulties to its transportation, handling and use in processes. There are no standards to evaluate charcoal compression strength, and the existing methods used in other researches consist in using prepared specimens and compressing them in the direction of the fibres. As charcoal is irregular shaped, granular and anisotropic, these tests may not reveal the behaviour of a charcoal bed, as a whole, when undergoing compressive loads. This may not relate to industrial conditions, where the load on charcoal is not exclusively applied on the direction of the fibres, but is randomly applied instead. This dissertation proposes an approach to quantify the effects of applying load on randomly distributed bulk charcoal. This represents an attempt of simulating conditions similar to what is expected in the industrial practice, such as in a blast furnace, rather than analysing individual pieces of charcoal. An apparatus has been prepared consisting of a tube and a piston that is pushed by an universal test machine. The experiments consist in carrying out repeated tests of compression of controlled sized charcoal with the apparatus. A particle size distribution is obtained as a function of the applied load, which is then classified by screening and weighing. Based on that, the particle size distribution is analysed both qualitative and quantitatively by using statistical tools. By means of the friability and survivability indexes, the method generates reproducible results with a sufficient number of repeats. In this way, it is possible to predict the behaviour of charcoal bulk under compression.
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Книги з теми "Strength anisotropy"

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Ambart͡sumi͡an, S. A. Theory of anisotropic plates: Strength, stability, and vibrations. Edited by Kunin I. A. 1924-. 2nd ed. New York: Hemisphere Pub. Corp., 1991.

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2

Jean-Paul, Boehler, International Union of Theoretical and Applied Mechanics., and International Congress on Mechanical Behaviour of Materials., eds. Yielding, damage, and failure of anisotropic solids: Proceedings of the IUTAM/ICM Symposium Antoni Sawczuk in Memoriam, Villard-de-Lans, 24-28 August 1987. London: Mechanical Engineering Publications, 1990.

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3

Theocaris, Pericles S. On a general theory of failure for the anisotropic matter. Athēnai: Grapheion Dēmosieumatōn tēs Akadēmias Athēnōn, 1997.

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4

Gürdal, Zafer. A compressive failure model for anisotropic plates with a cutout under compressive and shear loads: Final technical report. [Washington, DC: National Aeronautics and Space Administration, 1985.

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5

EUROMECH-MECAMAT '2002 (2002 Liège, Belgium). 6th European Mechanics of Materials Conference on Non-Linear Mechanics of Anisotropic Materials : EUROMECH-MECAMAT'2002: EMMC6 : Liège, Belgium, 9-12 September, 2002. Les Ulis, France: EDP Sciences, 2003.

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6

Yielding, Damage, and Failure of Anisotropic Solids (EGF Publication 5) (Egf Publication). Wiley, 2005.

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7

Determination of residual stress in composite materials using ultrasonic waves: NASA contract # NAG3-1716. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Частини книг з теми "Strength anisotropy"

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Jiang, Hao, Wu Liu, Jin Cheng, Huayan Yao, Renjie Li, and Jinhang Shang. "Numerical Analysis of Large-Diameter Shield Tunneling Disturbance Considering Stratum Strength Anisotropy." In Lecture Notes in Civil Engineering, 500–513. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-5814-2_45.

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AbstractThe anisotropic characteristics of natural strata could have a significant effect on the tunneling disturbance of shield tunnels. A shield tunneling disturbance simulation method considering the effect of stratum strength anisotropy is proposed in this study. The proposed method adopts the microstructure tensor theory to characterize the anisotropy effects of the stratum material cohesion c and the internal friction angle φ, and finely simulates the shield tunneling processes, including the shield shell advancement, the lining installation, and the shield tail grouting. The shield tunneling refined simulation method is validated by simulating the tunneling process in a certain section of a super-large-diameter shield tunnel in Wuhu City, Anhui Province, China, with good agreement between the simulated surface settlements on the axial and transverse profiles of the excavated tunnel after tunneling to different lining-ring numbers and the monitoring data. On this basis, according to the anisotropic compression strength property of the layered stratum in other sections, the effect of the stratum shear strength anisotropy on the shield tunneling disturbance is analyzed. The shield tunneling-induced surface settlement under the case considering stratum shear strength parameters anisotropy is obviously greater than that without accounting for the anisotropy, demonstrating the importance of considering strata anisotropy caused by geological structures during shield tunneling disturbance modeling.
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2

Toribio, Jesús, Beatriz González, and Juan-Carlos Matos. "Strength Anisotropy in Prestressing Steel Wires." In Materials with Complex Behaviour II, 259–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-22700-4_15.

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NISHIMURA, S., R. J. JARDINE, and N. A. MINH. "Shear strength anisotropy of natural London Clay." In Stiff Sedimentary Clays, 97–110. London: Thomas Telford Ltd, 2011. http://dx.doi.org/10.1680/ssc.41080.0009.

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Guessab, B., and S. Turgeman. "Generalized Yield Strength Criteria for Bar Structures." In Anisotropy and Localization of Plastic Deformation, 611–14. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3644-0_142.

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Kuwazuru, Osamu, and Nobuhiro Yoshikawa. "Strength Anisotropy Estimation of Plain-Weave Fabrics by Pseudo-Continuum Model." In Fracture and Strength of Solids VI, 835–40. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-989-x.835.

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Ustinov, K. B. "Inelastic Deformation of Rocks with Deformation and Strength Anisotropy." In Springer Proceedings in Earth and Environmental Sciences, 487–94. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-25962-3_48.

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Huang, Zhi Gao, Heng Lai, Jian Min Zhang, Jia Xin Li, Feng Ming Zhang, and You Wei Du. "The Influences of Size and Anisotropy Strength on Hysteresis Scaling for Anisotropy Heisenberg Multilayer Films." In Solid State Phenomena, 1085–88. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-30-2.1085.

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Imseeh, Wadi H., Khalid A. Alshibli, Peter Kenesei, and Hemant Sharma. "Influence of Crystalline Structure on Strength Anisotropy of Silica Sand." In Springer Series in Geomechanics and Geoengineering, 87–98. Cham: Springer Nature Switzerland, 2022. http://dx.doi.org/10.1007/978-3-031-22213-9_10.

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Mochizuki, A., A. Zh Zhussupbekov, Y. Zharkenov, and S. Akhazhanov. "Strength ellipses of induced anisotropy for a compacted sandy material." In Smart Geotechnics for Smart Societies, 291–99. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003299127-25.

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Yolcu, Cem, Magnus Herberthson, Carl-Fredrik Westin, and Evren Özarslan. "Magnetic Resonance Assessment of Effective Confinement Anisotropy with Orientationally-Averaged Single and Double Diffusion Encoding." In Mathematics and Visualization, 203–23. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-56215-1_10.

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AbstractPorous or biological materials comprise a multitude of micro-domains containing water. Diffusion-weighted magnetic resonance measurements are sensitive to the anisotropy of the thermal motion of such water. This anisotropy can be due to the domain shape, as well as the (lack of) dispersion in their orientations. Averaging over measurements that span all orientations is a trick to suppress the latter, thereby untangling it from the influence of the domains’ anisotropy on the signal. Here, we consider domains whose anisotropy is modeled as being the result of a Hookean (spring) force, which has the advantage of having a Gaussian diffusion propagator while still confining the spatial range for the diffusing particles. In fact, this confinement model is the effective model of restricted diffusion when diffusion is encoded via gradients of long durations, making the model relevant to a broad range of studies aiming to characterize porous media with microscopic subdomains. In this study, analytical expressions for the powder-averaged signal under this assumption are given for so-called single and double diffusion encoding schemes, which sensitize the MR signal to the diffusive displacement of particles in, respectively, one or two consecutive time intervals. The signal for one-dimensional diffusion is shown to exhibit power-law dependence on the gradient strength while its coefficient bears signatures of restricted diffusion.
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Тези доповідей конференцій з теми "Strength anisotropy"

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Krein, Ronny, and Vadym Sushko. "Wire Arc Additive Manufacturing of Creep Strength Enhanced Ferritic Steels and Nickel Alloys." In AM-EPRI 2024, 495–506. ASM International, 2024. http://dx.doi.org/10.31399/asm.cp.am-epri-2024p0495.

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Abstract Additive manufacturing is a groundbreaking manufacturing method that enables nearly lossless processing of high-value materials and produces complex components with a level of flexibility that traditional methods cannot achieve. Wire arc additive manufacturing (WAAM), utilizing a conventional welding process such as gas metal arc welding, is one of the most efficient additive manufacturing technologies. The WAAM process is fully automated and guided by CAD/CAM systems on robotic or CNC welding platforms. This paper explores the fundamental concepts and metallurgical characteristics of WAAM. It focuses primarily on the mechanical properties of printed sample structures made from P91, X20, and alloys 625 and 718 wire feedstock. The study particularly addresses the anisotropy of mechanical properties through both short-term and long-term testing, comparing these results to materials processed using conventional methods.
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Goto, Syun, Tsuyoshi Sugimoto, Makoto Nanko, and Natsumi Ideta. "Anisotropy and Metal Structure Characteristics of 3D Metal Printer Materials Due to Carburization." In IFHTSE 2024, 16–22. ASM International, 2024. http://dx.doi.org/10.31399/asm.cp.ifhtse2024p0016.

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Abstract Metal additive manufacturing is a molding method with a high degree of freedom because it can be created from high-strength materials using by CAD, etc. In recent years, there is a demand for metal additive manufacturing due to the demand for more complex mechanisms and shape in industrial products. However, the mechanical properties of metal additive manufacturing materials as metallic materials are not clear compared to metallic materials by melting method. In this study, two types of metal additive manufacturing (AM) materials with different lamination directions are carburized and heat treated to clarify the differences from general metallic materials and to clarify the causes. The carburized AM materials were confirmed to have a surface hardness of 550HV and a total carburization depth of 200 μm, but the amount of carburization differed depending on the orientation. In addition, when analyzed with a SEM, a metal structure was formed in an equiaxed crystal shape, and segregation of metal elements was observed.
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Cheng, Qinglu, Carl Sondergeld, and Chandra Rai. "Experimental study of rock strength anisotropy and elastic modulus anisotropy." In SEG Technical Program Expanded Abstracts 2013. Society of Exploration Geophysicists, 2013. http://dx.doi.org/10.1190/segam2013-1349.1.

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4

Gruttadauria, A., C. Mapelli, D. Mombelli, S. Barella, and G. Villa. "Texture and Anisotropy Study on a Lightweight Steel." In International Symposium on New Developments in Advanced High-Strength Sheet Steels. Association for Iron & Steel Technology, 2023. http://dx.doi.org/10.33313/298/014.

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5

Celestino, T. B., G. R. de Castro, P. Vessaro, A. A. Bortolucci, and O. J. Santos. "Strength and Deformability Anisotropy of Fiber-Reinforced Shotcrete." In 10th International Conference on Shotcrete for Underground Support. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40885(215)13.

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Fathi, A., J. J. Roger Cheng, Samer Adeeb, and Joe Zhou. "Critical Buckling Strain in High Strength Steel Pipes Using Isotropic-Kinematic Hardening." In 2010 8th International Pipeline Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ipc2010-31149.

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Анотація:
High strength steel pipes (HSSP) have become more popular recently for highly pressurized pipelines built to transport natural gas from remote fields to energy markets. Material tests on HSSP showed significant material anisotropy caused by the pipe making process, UOE. A combined isotropic-kinematic hardening material model is developed based on observations made on longitudinal and transverse stress strain data of HSSP. This material model combines linear isotropic hardening with Armstrong-Fredrick kinematic hardening and can be easily calibrated by longitudinal and transverse tension coupon test results. The proposed material model is used to show how considering material anisotropy affects the critical buckling strain of HSSP in the longitudinal direction. Finite element (FE) models are developed to simulate one pressurized and one unpressurised HSSP tested under monotonic displacement-controlled bending. Isotropic and anisotropic material modeling methods are used for each HSSP models. In the isotropic material model, longitudinal stress-strain data of HSSP material is used to define the stress-strain relationship. In the anisotropic model combined hardening material model, calibrated by longitudinal and transverse HSSP stress-strain data, is used. Critical buckling strain predictions by isotropic and anisotropic models of these pipes are compared with test results and also with some available criteria in standards and literatures. These comparisons show that anisotropic models give predictions closer to test results.
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Hansen, Søren G., Nadieh E. Meinen, and Henrik B. Jørgensen. "Anisotropic Concrete Compressive Strength in Existing Structures." In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.2406.

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<p>Assessment of the load‐carrying capacity of existing concrete structures is often based on the concrete compressive strength obtained from drilled cores. These cores are typically drilled perpendicular to the concrete surface, under the assumption that the mechanical properties of the concrete are isotropic. Recent studies however showed that concrete may in fact be subject to anisotropic behaviour. These studies are limited to newly‐cast concrete only, and little is known about the anisotropic behaviour of existing structures in‐service. This paper presents the first results of a large experimental programme where the anisotropy of the compressive strength in existing concrete structures is investigated. For this, 195 cores, drilled from a large concrete bridge located in Denmark, are tested. Three drilling directions are considered. The results are analysed using statistical techniques. The results showed that there is a statistically significant difference between the compressive strength in longitudinal and transverse/vertical direction, with an average value of</p><p>4.5 MPa in the disadvantage of the longitudinal direction.</p>
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Li, Wei, Juner Zhu, Yong Xia, and Qing Zhou. "Testing and Modeling the Effect of Strain-Rate on Plastic Anisotropy for a Traditional High Strength Steel." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53270.

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The effect of strain-rate on plastic anisotropy of an HSLA340 steel sheet is investigated in the present paper. Uniaxial tension tests in seven different directions are performed under three strain-rates (one in quasi-static range and two in intermediate range). Flow stress and Lankford r-value are obtained from the test data to describe the plastic anisotropy of the material. Results show that the anisotropy varies with the increase in strain-rate. To model this rate-dependent anisotropic behavior, three associated flow rule based yield functions, Hill48, Yld96, and Yld2000_2d, are employed first for each strain-rate. Though the result cannot match the test data perfectly, it still seems acceptable considering the complexity of the trend of anisotropy. Accordingly, the coefficients of these models are studied, and it turns out that all of them change with the stain-rate in a similar trend. Based on this result, a rate-effect term is introduced to the coefficients of the models to characterize the rate-effect on plastic anisotropy. Finally, two issues about the modeling work are discussed. One is calibrating the Yld96 and Yld200_2d model with the non-associated flow rule, which means the coefficients of the functions are determined by flow stress only or r-value only separately. It is found that the accuracy of the characterization is largely improved because of the increase in model coefficients. The other issue that is discussed is the modeling of strain-rate effect on the plastic anisotropy. A new strategy is considered, in which the strain-rate effects in different directions are characterized first, followed by the anisotropy description. The results of the two strategies are compared and good agreement is achieved.
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Fayemi, Olalekan, Qingyun Di*, Qihui Zhen, and Oreoluwa B. Omisore. "Effect of transverse anisotropy on electromagnetic telemetry signal strength." In GEM 2019 Xi'an: International Workshop and Gravity, Electrical & Magnetic Methods and their Applications, Chenghu, China, 19-22 April 2015. Society of Exploration Geophysicists and Chinese Geophysical Society, 2019. http://dx.doi.org/10.1190/gem2019-042.1.

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Dewhurst, D., J. Sarout, C. Delle Piane, M. Josh, A. F. Siggins, and M. D. Raven. "Geomechanics and Physics Related to Shale Strength, Stiffness and Anisotropy." In International Workshop on Geomechanics and Energy. Netherlands: EAGE Publications BV, 2013. http://dx.doi.org/10.3997/2214-4609.20131987.

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Звіти організацій з теми "Strength anisotropy"

1

Allen, Jeffrey, Robert Moser, Zackery McClelland, Md Mohaiminul Islam, and Ling Liu. Phase-field modeling of nonequilibrium solidification processes in additive manufacturing. Engineer Research and Development Center (U.S.), December 2021. http://dx.doi.org/10.21079/11681/42605.

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Анотація:
This project models dendrite growth during nonequilibrium solidification of binary alloys using the phase-field method (PFM). Understanding the dendrite formation processes is important because the microstructural features directly influence mechanical properties of the produced parts. An improved understanding of dendrite formation may inform design protocols to achieve optimized process parameters for controlled microstructures and enhanced properties of materials. To this end, this work implements a phase-field model to simulate directional solidification of binary alloys. For applications involving strong nonequilibrium effects, a modified antitrapping current model is incorporated to help eject solute into the liquid phase based on experimentally calibrated, velocity-dependent partitioning coefficient. Investigated allow systems include SCN, Si-As, and Ni-Nb. The SCN alloy is chosen to verify the computational method, and the other two are selected for a parametric study due to their different diffusion properties. The modified antitrapping current model is compared with the classical model in terms of predicted dendrite profiles, tip undercooling, and tip velocity. Solidification parameters—the cooling rate and the strength of anisotropy—are studied to reveal their influences on dendrite growth. Computational results demonstrate effectiveness of the PFM and the modified antitrapping current model in simulating rapid solidification with strong nonequilibrium at the interface.
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