Academic literature on the topic 'Nadai-Lode'
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Journal articles on the topic "Nadai-Lode"
1
Nikolaev, Alexei, and Vsevolod Nikolaev. "Lithospheric stress state in South America as inferred from tidal triggering of earthquakes." Geofísica Internacional 35, no. 3 (July 1, 1996): 329–38. http://dx.doi.org/10.22201/igeof.00167169p.1996.35.3.466.
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Se presenta un modelo del estado de esfuerzo en la litosfera sudamericana, con base en el desgatillamiento de sismos por efecto de las mareas. Se utilizó un catálogo de 23,399 temblores de magnitud M>3.5 y se calculó la diferencia entre el número de temblores que ocurre durante fases opuestas de la marea. Se calcularon los coeficientes de Lode-Nadai, que muestran el estado de esfuerzo tensional a lo largo de la Cordillera, y caótico en el interior del continente.
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Asfandiyarov, Rashid, Georgy I. Raab, and Denis Aksenov. "Analysis of the Stress-Strained State of Billets Processed by Rotary Forging with Special Shape of the Tool." Journal of Metastable and Nanocrystalline Materials 31 (January 2019): 16–21. http://dx.doi.org/10.4028/www.scientific.net/jmnm.31.16.
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In this paper, we investigated the process of rotary forging of commercially pure copper grade M2 using standard and special-shaped anvils and presented the results of studies obtained by the method of numerical and physical modeling. It is established that the use of anvils with special geometric shapes provides a higher level of accumulated strain and the formation of more dispersed structural states with the same elongation ratio under conditions of multi-cycle processing [1]. The formation of a finer structure in its turn increases the hardness and strength of the material. In addition, the special shape of the anvils provides a positive field of values of the Lode-Nadai coefficient in the cross section of the samples, predominantly in a range of 0.3-0.7 and, correspondingly, a more "comfortable" stress state close to non-uniform all-round compression, which contributes to increasing technological plasticity.
3
Marinin, A. V., and T. Yu Tveritinova. "Paleostress reconstructions and structure of the Tuapse strike-slip fault." Moscow University Bulletin. Series 4. Geology, no. 1 (February 28, 2016): 41–55. http://dx.doi.org/10.33623/0579-9406-2016-1-41-55.
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The results of the field structural studies of Northwest Caucasus Tuapse Shear Zone are presented. There are strike-slip displacements of different scale and the domination of horizontal shear conditions (type of geodynamic stress state that cause the formation of faults with mainly lateral movement of the wings along strike fault surface) within this zone. Using the method of cataclastic analysis of the collected geological paleostresses indicators the quantitative characteristics of the local stress states within the shear zone - position of the principal stresses axes and the Lode-Nadai coefficient - are identified. Differences of these characteristics considered for large tectonic zones. Significant spatial (territorial) variations of the orientations of the principal normal stresses axes identified within the shear zone, and their small smooth variations within local areas, which indicate on consistency of the general stress direction in the formation of studied fault structures in the Late Eocene-Miocene deformation period.
4
Rekov, A. M. "The Density of Deformations Distribution on the Side Edges during Strip Rolling." Solid State Phenomena 316 (April 2021): 340–45. http://dx.doi.org/10.4028/www.scientific.net/ssp.316.340.
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Experimental densities of intensity distribution for main deformations, as well as the stress strain state of a metal on the side edges of an aluminum strip during its flat rolling, have been determined. Strain, spread and extrusion ratio have been evaluated. The dimensions of the strip cross-section have been chosen in a way that minimizes spreading. Therefore, the deformed state under rolling is close to a flat one. The correlation between the deformation intensity and the stress-strain state of macro-volumes occurred on strip edges has been estimated. The parameters of two-dimensional probability-density function for the joint distribution of deformation intensity and the Nadai-Lode stress-strain parameter have been determined. Distribution densities for longitudinal, transverse deformations and the intensity of main deformations in the zone of strip rolling are bimodal, which corresponds to both forward and backward slip zones under rolling. The results of the work can be used to predict the depletion of plasticity resources during strip rolling.
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Savvichev, P. A., and Yu L. Rebetsky. "Modern state of crustal stresses of the Apennine Peninsula and adjacent territories (Central Mediterranean region)." Geodynamics & Tectonophysics 10, no. 4 (December 11, 2019): 921–35. http://dx.doi.org/10.5800/gt-2019-10-4-0449.
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This paper discusses models showing the formation of the Central Mediterranean region and the geodynamic setting of the Apennine Peninsula. Cataclastic analysis is used for a repeated reconstruction of the Central Mediterranean region. The catalogue of earthquake focal mechanisms includes 662 events (3.6≤Mb≤6.5) recorded in the study area from 1977 to 2015 (Global CMT, http://www.globalcmt.org; RCMT, http://rcmt2.bo.ingv.it/index.html; Italian CMT dataset, http://rcmt2.bo.ingv.it/Italydataset.html). The reconstruction yielded the directions of principal stresses (including algebraically maximum and minimum ones), locations of domains differing in geodynamic regime, Lode – Nadai coefficients, and orientation of tangential shear stresses acting from the mantle to the crust. By comparing our results to the published data obtained by M.‐L. Zoback’s method, we have identified differences in the orientations of maximum horizontal compression axes at points where the stress ellipsoid takes on its critical values. It is revealed that the strongest earthquakes (M>6) were generated in the areas characterized by the minimum and average relative stress magnitudes.
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Romanov, O. V. "On the influence of the stress state on the deformation of construction materials." Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics, no. 4 (2021): 66–69. http://dx.doi.org/10.17721/1812-5409.2021/4.10.
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The question of the influence of the type of stress state (TSS) on the process of scleronomic and rheonomic deformation of structural materials under simple and close to simple loading conditions is considered. The parameters characterizing the TSS are indicated. This is a parameter (indicator) of the rigidity of the stress state, which reflects the influence of the first invariant of the stress tensor and is, with an accuracy of a constant factor, the ratio of the hydrostatic component of the stress tensor to its deviator component. The influence of the third invariant of stress tensors is taken into account by a number of parameters – the Nadai-Lode parameter, as well as the TSS angle in its various interpretations. A variant of taking this influence into account by introducing the governing equation of state of the function with the parameter of the TSS angle is shown. This function is determined based on analysis of basic tensile and torsion experiments. It is shown that taking into account VNS increases the accuracy of the calculation and improves the agreement between the calculation results and experiment.
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Ibragimova, T. L., R. S. Ibragimov, M. A. Mirzaev, and Yu L. Rebetsky. "THE CURRENT STRESS OF EARTH'S CRUST IN THE TERRITORY OF UZBEKISTAN ACCORDING TO FOCAL EARTHQUAKE MECHANISMS." Geodynamics & Tectonophysics 12, no. 3 (September 17, 2021): 435–54. http://dx.doi.org/10.5800/gt-2021-12-3-0532.
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The current stress of Earth's crust in the territory of Uzbekistan has been studied using a focal earthquake mechanisms catalogue that includes the data provided by many authors. Stress reconstructions are based on the cataclastic analysis of displacements along fractures. For reconstructing the stress state at different depths of the crust in several seismically active regions of the study area, we consider a minimum number of earthquakes in a homogeneous sample equal to 6 and an averaging radius of 10 to 30 km within a single domain. The azimuths and dip angles of the principal stress axes, Lode – Nadai coefficients, geodynamic types of stress modes, relative (normalized to rock strength) values of maximum shear stresses, and effective pressure values are determined. Maps showing the spatial distribution of the studied parameters are constructed for both the entire seismically active layer and the depth layers. Stress fields are reconstructed and compared at two hierarchical levels based on the parameters of focal mechanisms of weak and moderate earthquakes (М≤4.5) and those of strong (М≥5.0) earthquakes. "Tectonic Stresses of Eurasia", the Internet resource created by IPE RAS, is used to visualize the stress field reconstructed from the data on strong (М≥5.0) earthquakes.
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Safonov, D. A. "RECONSTRUCTION OF THE TECTONIC STRESS FIELD IN THE DEEP PARTS OF THE SOUTHERN KURIL-KAMCHATKA AND NORTHERN JAPAN SUBDUCTION ZONES." Geodynamics & Tectonophysics 11, no. 4 (December 15, 2020): 743–55. http://dx.doi.org/10.5800/gt-2020-11-4-0504.
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Earthquake focal mechanisms in the Southern Kuril-Kamchatka and Northern Japan subduction zones were analysed to investigate the features of the tectonic stress field inside the Pacific lithospheric plate subducting into the upper mantle. Earthquake focal mechanism (hypocenter depths of more than 200 km) were taken from the 1966– 2018 NIED, IMGiG FEB RAS and GlobalCMT catalogues. The tectonic stress field was reconstructed by the cataclastic analysis method, using a coordinate system related to the subducting plate. In most parts of the studied seismic focal zone, the axis of the principal compression stress approximately coincides with the direction of the Pacific lithospheric plate subduction beneath the Sea of Okhotsk. It slightly deviates towards the hinge zone separating the studied regions. The principal tension stress axis is most often perpendicular to the plate movement, but less stable in direction. This leads to compression relative to the slab in some parts of the studied regions, and causes shearing in others. The hinge zone is marked by the unstable position of the tension axis and high values of the Lode–Nadai coefficient, corresponding to the conditions of uniaxial compression, while the compression direction remains the same, towards the slab movement. Two more areas of uniaxial compression are located below the Sea of Japan at depths of 400–500 km.
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Safonov, D. A. "The recent tectonic stress field of the Amur region." Geodynamics & Tectonophysics 9, no. 3 (October 9, 2018): 1025–37. http://dx.doi.org/10.5800/gt-2018-9-3-0382.
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The Amur region (Priamurie) is located in the NE part of the Amur lithospheric plate and its surrounding territories. Seismic activity is moderate in Priamurie, and the regional earthquakes, including the strongest ones, occur mainly in three seismic belts: Stanovoi (the zone of influence of the eastern flank of the Stanovoi fault), Yankan-Tukuringra-Soktakhan (the eastern flank of the Mongolia-Okhotsk lineament), and Turan-Selemzhinsky (from the Lesser Khingan to the north). The Sakhalin Branch of FRC GS RAS Catalogue of focal mechanisms of 57 regional earthquakes provide the data for a more precise estimation of the parameters of the crustal stress state in the study area. The Cataclastic Analysis Method (CAM) developed by Yu.L. Rebetsky (stage 1) was used to estimate the orientations of the main axes of the stress tensor and the Lode – Nadai coefficient. The analysis shows that the Upper Priamurie is dominated by shearing and compression with shearing. The Amur plate moves relative to the Aldan-Stanovoi block along the South Tukuringra and North Tukuringa faults to the east. Vertical shearing is predominant along the Dzheltulak fault and the western segment of the North Tukuringra fault. The NNE-trending compression takes place in the area located east of the quiescence zone of the Dzhagda ridge. Along the Mongolia-Okhotsk fault system, near the Sea of Okhotsk, the direction of compression changes to the northward one. The tectonic stress field along the Tanlu fault zone is inhomogeneous and comprises the alternating zones of horizontal compression and stretching with varying directions of the main stress axes. To the east of the band characterized by the maximum seismic activity, compression changes its direction to the southeast- and eastward. Probably, the impact of the oceanic subduction on the northern part of the Japan-Korean block begins to manifest itself in this part of the Amur region. The tectonic stress field reconstructed from the seismological data is consistent with the measurements of the modern crustal movements. The results of our study can prove useful for clarifying the tectonics of the region.
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Sim, L. A. "Tectonophysical criteria for forecasting the locations of quartz crystal deposits (case of Subpolar Ural)." Geodynamics & Tectonophysics 11, no. 1 (March 19, 2020): 31–38. http://dx.doi.org/10.5800/gt-2020-11-1-0460.
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Spatial reconstruction of tectonic stresses within the Subpolar Ural quartz crystal-containing province was conducted by the kinematic method [Gushchenko, 1973, 1979] based on the main indicators of tectonic stresses on slickensides. Local stress states (LSS) and general stress fields for large blocks were reconstructed by the method described in [Sim, Marinin, 2015]. In the blocks with numerous occurrences of quartz crystal (Pelingichey and Omega-Shor blocks), the general stress fields is characterized by a stress state close to uniaxial tension, i.e. the Lode-Nadai coefficient µ=–1. In these blocks, thick quartz veins are perpendicular to the tension axis of the general stress field. In the block without quartz crystal (West Saled), the general stress field is characterized by a triaxial stress state or pure shear state (–1˂µσ˂+1). The LSS of the quartz crystal deposits show the following: the stress state of µ=–1 is typical of quartz veins without quartz crystal nests, and a special kind of stress state is reconstructed near the nests with piezoelectric material. It is named a variation of the type of stress state (VTSS), which means that within one tectonic stage, the type of stress state changes approximately as follows: µσ=+1 (40 %), µσ=–1 (40 %), and –1˂µσ˂+1. It means that in the piezoelectric mineral deposits, pulsating tectonic stresses provided for a fluid flow of hydrothermal solutions at the intersection of ore-bearing and ore-controling faults when tension (µ=–1) was replaced with compression (µ=+1), while the orientations of compression and tension axes remained unchanged. Apparently, such a regime was caused by alternating activation of the above-mentioned faults. The tectonic stress reconstructions were performed for 33 mineral deposits and occurrences of quartz crystal. VTSS was determined in 32 deposits; one mineral occurrence is characterized by uniaxial tension. Therefore, we propose using VTSS (variation of the type of stress state) as a criterion for predicting the locations of quartz crystal deposits.
Dissertations / Theses on the topic "Nadai-Lode"
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Куан, Фам Дик. "Критерій граничного стану конструкційних матеріалів з врахуванням пошкоджуваності." Doctoral thesis, Київ, 2019. https://ela.kpi.ua/handle/123456789/30096.
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Дисертаційна робота присвячена розробці критерія граничного стану
конструкційних матеріалів, які працюють в умовах складного напруженого стану у
випадку статичного навантаження з урахуванням пошкоджуваності. Для визначення величини параметра пошкоджуваності використовувалися різні
енергетичні підходи, які базуються на зміні фізико-механічних характеристик
матеріалів при простих навантаженнях (розтяг та кручення).
На основі отриманих експериментальних результатів на різних конструкційних
матеріалах, вдосконалено модель опису кінетики накопичення пошкодження,
запропонований Бонора, в залежності від рівня пластичної деформації. Отримано
залежність параметрів моделі та критерія граничного стану від пружно-пластичних
характеристик матеріала. Проведено порівняння отриманих теоретичних значень з
експериментальними.
Розроблена методика визначення кінетики накопичення пошкодження у випадку
кручення циліндричних зразків з врахуванням неоднорідності розподілу деформації
в перерізі зразка.
На основі підходу Давіденкова-Фрідмана розроблено критерій граничного стану
конструкційних матеріалів з врахуванням виду напруженого стану та
пошкоджуваності. Представлено порівняння результатів граничного стану,
отриманих за розробленим критерієм, експериментальними даними, та іншими
методами.