Journal articles: 'Type of stress state'

1

Gordienko, I. E. "Stress-strain state of a rod-type piezoceramic sensor." Strength of Materials 20, no. 7 (July 1988): 928–32. http://dx.doi.org/10.1007/bf01528710.

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Lomakin, E. V., and A. M. Melnikov. "Plane stress state of media with plastic properties sensitive to the type of stress." Computational Continuum Mechanics 2, no. 2 (2009): 48–64. http://dx.doi.org/10.7242/1999-6691/2009.2.2.12.

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Kazarina, S. A., A. A. Movchan, and A. L. Sil’chenko. "Effect of the Type of State of Stress on the Stress Relaxation in Titanium Nickelide." Russian Metallurgy (Metally) 2018, no. 4 (April 2018): 328–33. http://dx.doi.org/10.1134/s0036029518040055.

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Bogomolov, V. Yu, V. I. Kochetov, S. I. Lazarev, and V. Yu Popov. "Calculation of Bayonet Stress-Strain State for Combined Type Membrane Apparatus." Vestnik Tambovskogo gosudarstvennogo tehnicheskogo universiteta 21, no. 3 (2015): 453–60. http://dx.doi.org/10.17277/vestnik.2015.03.pp.453-460.

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Galatenko, G. V. "Dugdale-type model for a mixed-mode crack: plane stress state." International Applied Mechanics 47, no. 1 (June 2011): 78–85. http://dx.doi.org/10.1007/s10778-011-0445-2.

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Natela Khoneliia and Svetlana Bugaeva. "THE REACTIVE CAPACITY OF THE SOIL BASES OF GRAVITY-TYPE QUAY WALL." World Science 1, no. 9(49) (September 30, 2019): 16–19. http://dx.doi.org/10.31435/rsglobal_ws/30092019/6696.

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The results of studies of the reactive capacity of the soil base of a gravity- type quay-wall on the basis of the method developed for calculating the “structure - soil base” system are considered. The method proposed allows determining the reactive capacity of the soil base in conditions of mixed stress state model (limit and sublimit stress state of the soil base) under and around of the base of the foundation structure in a wide range of loads of lateral earth pressure. The transformation of limit and sublimit stress state zones of the soil base on the basis of numerical modeling is presented which shows an increase of the sizes of limit stress state and a decrease of the sizes of sublimit stress state.

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Berthelot, Curtis, Diana Podborochynski, Colin Wandzura, Colin Prang, and Brent Marjerison. "Triaxial frequency sweep characterization of Saskatchewan hot mix asphaltic concrete across asphalt cement binder type." Canadian Journal of Civil Engineering 36, no. 9 (September 2009): 1403–10. http://dx.doi.org/10.1139/l09-066.

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The purpose of this research was to determine how asphalt cement binder types influence the mechanical behaviour of hot mix asphalt concrete mixes. This research employed triaxial frequency sweep characterization of a typical City of Saskatoon Hot Mix Type A2 and a typical Saskatchewan Ministry of Highways and Infrastructure Hot Mix Type 70 across a range of triaxial load frequencies and stress states representative of Saskatchewan field state conditions. The asphaltic mixes were evaluated across four asphalt cement binder types typically employed by Saskatchewan road agencies. Based on the findings of this study, the mechanical behaviour of both asphalt mixes evaluated were found to be highly sensitive to load rate, stress state, as well as asphaltic binder type. It was concluded that load rate, field stress state, and asphalt binder type should be incorporated into the structural design of hot mix asphalt concrete pavements to ensure adequate mix performance, particularly when placed in severe field conditions.

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Dyakov, D. A., and O. E. Akbasheva. "Oxidative stress and proteolysis system in type 2 diabetes." Diabetes mellitus 25, no. 1 (March 22, 2022): 14–20. http://dx.doi.org/10.14341/dm12402.

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Background: In establishing the diagnosis — type 2 diabetes, there is a trend of multiple increases every year, which is a health issue. According to the state register, the statistics of patients with diabetes in Russia is about 17% of the total population of the country. The prevalence of diabetes is steadily increasing every year. Today, diabetes mellitus is the leader among the prevalence of non-communicable diseases after cancer, cardiovascular diseases, often leading to disability and death.Aim: To study the relationship between oxidative stress and the «proteinase-inhibitor» system in diabetes mellitus 2.Materials and methods: An observational single-center single-stage sample study was conducted with the participation of patients with type 2 diabetes mellitus and a control group (practically healthy individuals). the activity of elastase-, trypsin-like proteinases, α1-proteinase inhibitor, the content of bityrosine as an indicator of oxidative modification of proteins and the state of lipid peroxidation were determined by spectrophotometric method in all subjects in blood plasma: the concentrations of TBK-active products and antioxidants-the activity of superoxide dismutase, catalase.Results: It was shown that in type 2 diabetes mellitus, the content of TBA of active products (an indicator of lipid peroxidation) increases by 2.34 times and the concentration of bityrosine — an indicator of oxidative modification of proteins, which was negatively dependent on the activity of a proteinase inhibitor (-0.79, p=0.03) increases by 7 times. A decrease in the activity of the proteinase inhibitor (by 23%) was accompanied by an increase in the activity of elastase — and trypsin-like proteinases, respectively, by 1.2 and 2.3 times, compared with practically healthy individuals. The activity of antioxidant enzymes, superoxide dismutase and catalase increased by 8.2 and 6.4 times, respectively.Conclusion: An increase in oxidative stress and oxidative modification of proteins is accompanied by a decrease in the activity of the proteinase inhibitor and an increase in the activity of elastase-, trypsin-like proteinases, as well as antioxidant enzymes.

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Lomakin, E. V. "Dependence of the limit state of composite and polymer materials on the type of stress state." Mechanics of Composite Materials 24, no. 2 (1988): 194–200. http://dx.doi.org/10.1007/bf00608152.

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Pomytkin, S. P., L. P. Vershinina, and N. N. Rozhkov. "Nonlinear endochronic creep models taking into account the type of stress state." IOP Conference Series: Materials Science and Engineering 537 (June 17, 2019): 042083. http://dx.doi.org/10.1088/1757-899x/537/4/042083.

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Starokon, I., and A. Ermakov. "Assessment of jacket-type platform stress state in corrosive environment: Case study." IOP Conference Series: Materials Science and Engineering 700 (November 25, 2019): 012018. http://dx.doi.org/10.1088/1757-899x/700/1/012018.

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12

Pan'ko, I. M., and N. I. Tim'yak. "Extension of the equivalent stress state method to general-type crack opening." Soviet Materials Science 27, no. 4 (1992): 371–74. http://dx.doi.org/10.1007/bf00723227.

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Bildyuk, N. A., A. A. Rak, and N. R. Turkina. "ANALYSIS OF THE STRESS-DEFORMED STATE OF WELDED JOINTS OF OVERLAPPING TYPE." Вестник Санкт-Петербургского государственного университета технологии и дизайна. Серия 1: Естественные и технические науки, no. 4 (2020): 126–31. http://dx.doi.org/10.46418/2079-8199_2020_4_21.

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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.

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Zhang, Guang, Jing Xi Chen, Wen Yu Jiao, and Heng Wei Zhang. "The Experimental Study on Fracture Characteristic of Rock." Key Engineering Materials 348-349 (September 2007): 321–24. http://dx.doi.org/10.4028/www.scientific.net/kem.348-349.321.

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Based on the stress analyses on the surrounding rockmass of underground caverns, the stress states on the surface and inside the surrounding rockmass are simulated respectively using biaxial compression tests and truly triaxial compression tests, and the fracture characteristic of rock and the relation between the angle of rock rupture,θ ,and stress state are studied. According to the testing results, the stress state condition of different type of rock bursts generating in different regions of the surrounding rockmass. The research results show that the rock burst of flake-splitting type takes place around the cavern’s surface under the biaxial compression stress state whereas that of shearing-dislocation type takes place inside the surrounding rockmass under the stress state of truly triaxial compression.

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Wang, Chang, and Jing Jing Gao. "Reconstruction Analysis of LH45 Type High Pressure Triplex Plunger Pump Shell." Applied Mechanics and Materials 595 (July 2014): 98–101. http://dx.doi.org/10.4028/www.scientific.net/amm.595.98.

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Due to the corrosion of liquid and dual role of job stress, the pump housing of the LH45 type three cylinder high pressure plunger pump was caused the breakage in the practical work, and its service life was greatly reduced. Studied the pump housing broken state and laws to selected material to manufacture. Established 3D entity of the pump housing model in the 3D CAD software so that the stress and strain state of remade shell can be analyzed using finite element software ANSYS. Compared with the state of stress and strain before shell remaking, the pump housing remaking is proved to be valid.

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Saito, Shunsuke, Fumio Ogawa, and Takamoto Itoh. "Fatigue Life Properties of Stainless Steels in Wide Ranged Biaxial Stress State." Key Engineering Materials 795 (March 2019): 60–65. http://dx.doi.org/10.4028/www.scientific.net/kem.795.60.

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Multiaxial fatigue tests consisting of push-pull loading and cyclic inner pressure were carried out using hollow cylinder specimens of type 430 stainless and type 316 stainless steels at room temperature. 7 types of cyclic loading paths were employed by combining axial and hoop stresses: a Pull, an Inner-pressure, a Push-pull, an Equi-biaxial, a Square-shape, a LT-shape and a LC-shape. Fatigue lives vary depending on the loading path when those were evaluated by the maximum Mises’ equivalent stress on inner surface of the specimen. The fatigue lives of both the steels showed a similar tendency although some Pull tests take longer fatigue life when cracks initiated from inside surface of the specimen. This study investigated the crack initiation and propagation behaviors as well as the initiation of oil leakage to prove the behavior and discusses life evaluation for two steels under wide ranged biaxial stress state, too.

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Wu, Cheng-Da, Te-Hua Fang, and Ying-Jhih Lin. "Quasi-continuum Simulations of Solid-state Pressure Nanowelding of Metals." Current Nanoscience 14, no. 3 (April 18, 2018): 179–86. http://dx.doi.org/10.2174/1573413714666180125151054.

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Background: Nanowelding is an attractive bottom-up fabrication technique that allows the construction, connection, and repair of nanomaterials. The effects of contact interference, crystal orientation, and material type of nanoscale welded pairs are investigated in terms of atomic trajectories, strain distribution, and the stress-strain curve. Methods: The quasi-continuum (QC) method is applied to simulate nanowelding process. The QC method is a multi-scale combined molecular dynamics approach that mixes atomistic and continuum algorithms. Results: At a small contact interference of 0-1 nm, the ultimate stress of welded pairs is independent of the magnitude of contact interference. Regarding the effect of material type, the average ultimate stress for Ni-Ni welded pairs is the highest and that for Cu-Cu welded pairs is the lowest, regardless of the contact orientation mode. The elongation of Ni-Ni welded pairs increases with increasing contact interference. Conclusion: The crystal orientation of the contact plane and material type significantly determine the welding quality. Welding on the close-packed plane of both substrates leads to the highest ultimate stress. The ultimate stress for Ni-Ni welding pairs is the highest, and that for Cu- Cu welded pairs is the lowest.

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Lomakin, E. V. "Dependence of the limit state of composite and polymer materials on the type of the stress state." Mechanics of Composite Materials 24, no. 1 (1988): 1–7. http://dx.doi.org/10.1007/bf00611327.

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Singh, A. K., K. C. Mistri, and A. Das. "Propagation of Love-Type Wave in a Corrugated Fibre-Reinforced Layer." Journal of Mechanics 32, no. 6 (June 17, 2016): 693–708. http://dx.doi.org/10.1017/jmech.2016.40.

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AbstractThe present paper investigates the propagation of Love-type waves in an initially stressed heterogeneous fibre-reinforced layer with corrugated boundary surfaces, lying over a viscoelastic half-space under hydrostatic state of stress. The dispersion relation is obtained in closed form and found to be in well-agreement with the classical Love wave equation. The substantial effect of reinforcement, position and undulation parameters (i.e. corrugation), heterogeneity, horizontal initial stress and hydrostatic state of stress are discussed briefly. It is established through comparative study that reinforced layer supports more to phase velocity of Love-type wave as compare to reinforced free layer.

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Mikhailov, E., V. Nigmatullin, and O. Rybakina. "Effect of stress state type and loading history on titanium alloy cold creep." Transactions of the Krylov State Research Centre 3, no. 385 (August 27, 2018): 50–60. http://dx.doi.org/10.24937/2542-2324-2018-3-385-50-60.

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Fang, Z., Y. Wu, and R. Zhu. "Stress Corrosion Cracking of Type 304 Stainless Steel Weldments in the Active State." CORROSION 50, no. 3 (March 1994): 171–75. http://dx.doi.org/10.5006/1.3293508.

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TAKAHASHI, Yuji, Mitsugu TODO, and Ryuji NAGAMINE. "437 Effect of Repeated Flexion in Stress State of PS type Knee Prosthesis." Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME 2007.20 (2008): 373–74. http://dx.doi.org/10.1299/jsmebio.2007.20.373.

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Baik, Seung Chul, Heung Nam Han, Sang Heon Lee, Kyu Hwan Oh, and Dong Nyung Lee. "Plastic behaviour of perforated sheets with slot-type holes under biaxial stress state." International Journal of Mechanical Sciences 42, no. 3 (March 2000): 523–36. http://dx.doi.org/10.1016/s0020-7403(99)00007-7.

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Fedorova, T. S., and S. N. Levachev. "ASSESSMENT OF STRESS-STRAIN STATE OF SOIL MASS OF DOCK-TYPE LOCK CHAMBER." Vestnik MGSU, no. 5 (May 2017): 519–28. http://dx.doi.org/10.22227/1997-0935.2017.5.519-528.

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Kulakov, P. A., A. V. Rubtsov, and V. Yu Malyshev. "The influence of ovality of the shell-type construction to stress-deformed state." Journal of Physics: Conference Series 1679 (November 2020): 052013. http://dx.doi.org/10.1088/1742-6596/1679/5/052013.

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Turovtsev, G. "A simple constitutive relationship for isotropic solids with stress-state type dependent properties." International Journal of Solids and Structures 32, no. 21 (November 1995): 3075–85. http://dx.doi.org/10.1016/0020-7683(94)00268-2.

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Galyautdinov, Z. R. "DYNAMIC STRENGTH CONDITION OF CONCRETE UNDER PLANE STRESS STATE." Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture 21, no. 4 (August 28, 2019): 138–45. http://dx.doi.org/10.31675/1607-1859-2019-21-4-138-145.

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Modern calculation models must take into account the dynamic deformation of reinforced concrete. Currently, the main regularities of nonlinear dynamic deformation of reinforced concrete under uniaxial stress state are theoretically analyzed in detail along with a wide range of experimental studies. Properties of concrete under plane stress -strain state and dynamic loading are examined to a lesser extent. This paper proposes the dynamic strength condition for the concrete strength which allows for changing the strain -hardening coefficient of concrete depending on the type of stress -strain state, the ratio of the primary stresses and the deformation rate.

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Bagby, Grover, Winifred Keeble, Tara Koretsky, Dylan Zodrow, Richard Jove, Laura Hays, and Hanqian Carlson. "Oxidative Stress Induces Binding of FANCD2 to STAT5 and Facilitates STAT5-Dependent Survival Signals." Blood 104, no. 11 (November 16, 2004): 33. http://dx.doi.org/10.1182/blood.v104.11.33.33.

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Abstract Fanconi anemia (FA) cells are hypersensitive to oxidative stress and exhibit aberrant STAT activation responses to defined extracellular proteins but whether these abnormalities are linked is unclear. Because oxidative stress is known to induce STAT activation, we hypothesized that proper STAT signaling responses in normal cells exposed to H2O2 require intact FA proteins. In fact, we found that FA-C, FA-G, and FA-D2 cells (fibroblasts) showed a significant increase in apoptosis after H2O2-exposure compared to retrovirally-complemented cells. H2O2 induced higher phospho-STAT5 (P-STAT5) expression in complemented cells than in mutant cells. Conversely, mutant cells expressed higher levels of P-STAT3 in both the ground state and after H2O2-induction than complemented cells. Aberrant STAT activation in FA mutant cells was shown to be both nucleus- and JAK2 kinase-dependent. Only low levels of STAT3 and STAT5 were induced in both mutant and complemented cytoplasts and AG490 (a Jak2 inhibitor) significantly suppressed H2O2-induced STAT5 responses. Seeking a direct role of FANCD2 in regulating proper STAT activation responses to H2O2, we carried out immunoprecipitation experiments (with an antibody to the N-terminal fragment of FANCD2) using PD20, a FA-D2 mutant cell line, and FANCD2 complemented PD20. In FANCD2-complemented and normal cells, anti-FANCD2 antibody immunoprecipitated STAT5. However, in mutant cells the same antibody immunoprecipitated STAT3, not STAT5. Thus, mutant (truncated) FANCD2 preferentially binds to and may activate STAT3 in the ground state. In fact, wild type FANCD2 also binds aberrantly to STAT3 in HSC536 (FA-C lymphoblasts) indicating that FANCC may influence the function of wild type FANCD2 and that binding of wild type FANCD2 to STAT3 does not require FANCD2 ubiquitinylation (FANCD2 is not ubiquitinylated in FA-C). Suspecting that in H2O2-exposed cells STAT5 signaling pathways lead to survival while STAT3 pathways lead to apoptosis, we transduced constitutively active mutants (*) of STATs 3 and 5 in mutant D2 and complemented cells. STAT3* increased apoptotic responses to H2O2 in complemented FA-D2 cells and STAT5* decreased apoptotic responses in H2O2-induced FA-D2 cells. In addition, the STAT5 inducible anti-apoptotic gene Bcl-XL was induced in H2O2-exposed complemented FA-D2 cells but not in FA-D2 cells. We conclude that FANCD2 functions to promote survival by ordering proper STAT signaling responses to oxidative stress and that this function of FANCD2 depends in part upon FA-C. We propose that FA cells are hypersensitive to oxidative stress in part because of imbalanced STAT signal transduction responses.

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Browning, Sean. "The Life Satisfaction of Informal Caregivers in Europe: Regime Type, Intersectionality, and Stress Process Factors." Innovation in Aging 5, Supplement_1 (December 1, 2021): 794. http://dx.doi.org/10.1093/geroni/igab046.2928.

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Abstract This research assessed the role of welfare state/family care regimes, intersecting social locations and stress process factors in influencing the life satisfaction of informal caregivers of care recipients with age-related needs or disabilities within a European international context. Empirical analyses were conducted with a sample of informal caregivers residing in Denmark, Sweden, France, Germany, Italy, Greece and the United Kingdom (n=6,007). Ordinary least squares and ordered logit regression models revealed that welfare state/family care regime, intersecting social locations, and stress process factors were independently associated with the life satisfaction of informal caregivers. Furthermore, there was some evidence to suggest that social location and stress process factors intervened in some of the relationships between regime type and life satisfaction. There was also some evidence that stress process factors intervened in the relationships between social location factors and life satisfaction. Overall, the results provide support for integrating welfare state/family care regime type and intersectionality factors into the stress process model as applied to the context of informal caregiving. The results also have policy and practice implications with regards to which social location and stress process factors explain specific disparities in life satisfaction between informal caregivers residing in different welfare state/family care regimes.

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Parikh, Lisa, Dongju Seo, Cheryl Lacadie, Renata Belfort-Deaguiar, Derek Groskreutz, Muhammad Hamza, Feng Dai, et al. "Differential Resting State Connectivity Responses to Glycemic State in Type 1 Diabetes." Journal of Clinical Endocrinology & Metabolism 105, no. 1 (September 12, 2019): 1–13. http://dx.doi.org/10.1210/clinem/dgz004.

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Abstract Context Individuals with type 1 diabetes mellitus (T1DM) have alterations in brain activity that have been postulated to contribute to the adverse neurocognitive consequences of T1DM; however, the impact of T1DM and hypoglycemic unawareness on the brain’s resting state activity remains unclear. Objective To determine whether individuals with T1DM and hypoglycemia unawareness (T1DM-Unaware) had changes in the brain resting state functional connectivity compared to healthy controls (HC) and those with T1DM and hypoglycemia awareness (T1DM-Aware). Design Observational study. Setting Academic medical center. Participants 27 individuals with T1DM and 12 HC volunteers participated in the study. Intervention All participants underwent blood oxygenation level dependent (BOLD) resting state functional magnetic brain imaging during a 2-step hyperinsulinemic euglycemic (90 mg/dL)–hypoglycemic (60 mg/dL) clamp. Outcome Changes in resting state functional connectivity. Results Using 2 separate methods of functional connectivity analysis, we identified distinct differences in the resting state brain responses to mild hypoglycemia between HC, T1DM-Aware, and T1DM-Unaware participants, particularly in the angular gyrus, an integral component of the default mode network (DMN). Furthermore, changes in angular gyrus connectivity also correlated with greater symptoms of hypoglycemia (r = 0.461, P = 0.003) as well as higher scores of perceived stress (r = 0.531, P = 0.016). Conclusion These findings provide evidence that individuals with T1DM have changes in the brain’s resting state connectivity patterns, which may be further associated with differences in awareness to hypoglycemia. These changes in connectivity may be associated with alterations in functional outcomes among individuals with T1DM.

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Pamungkas, Ari. "STRESS DAN KEPRIBADIAN MAHASISWA PTKIN MENGHADAPI COVID-19." Jurnal Bimbingan Penyuluhan Islam 2, no. 2 (January 24, 2021): 165. http://dx.doi.org/10.32332/jbpi.v2i2.3013.

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Abstract The Covid-19 pandemic has had a significant impact on various dimensions of life including increasing stress among students. Therefore, this study aims to analyze the relationship between stress levels and the personality type of state Islamic religious college students (PTKIN). This research is a type of quantitative research. The sample in this study were 100 students of the Faculty of Ushuluddin Adab and Da'wah at IAIN Palangkaraya using purposive random sampling technique. The data in this study used 2 standardized instruments, namely the Eysenck Personality Inventory (EPI) instrument to measure extrovert-introvert personality and stress levels using the DASS-21 instrument. The conclusion of the research data analysis is that students who have a stress level during the Covid-19 pandemic are dominated by students who have an introverted personality type. This situation shows that introvert personality types are at greater risk of experiencing stress in the face of the Covid-19 pandemic compared to students with extrovert personality types.

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Reznik, V. S. "Justification of application of nonlinear viscoelasticity model of Rabotnov's model type in creep problems." Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics, no. 3 (2021): 111–14. http://dx.doi.org/10.17721/1812-5409.2021/3.21.

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The relationship between the components of the strain tensor, stress tensor and time is given by the defining equations of the hereditary type, which are written based on the hypothesis of proportionality of the deviators. Thin-walled tubular low-pressure polyethylene elements are considered as the object of research. The scope of the model is substantiated based on the hypothesis of the existence of a single diagram of instantaneous deformation and a single diagram of long-term deformation. The invariance of the tensile and torsion diagrams with respect to the stress state is checked. The region of nonlinear elastic deformation is determined. The defining equations of the model contain a set of functions and coefficients determined from the basic experiments. A method for determining the parameters of heredity kernels of nonlinear viscoelastic materials under complex stress state has been developed. The nonlinearity of viscoelastic properties is given by equations of the Rabotnov's model type. The method is based on the relations between the creep kernels obtained under conditions of complex stress state and the creep kernels under one-dimensional stress state. The method is tested experimentally on the problems of calculating creep deformations under combined loading of thin-walled tubular elements made of low-pressure polyethylene.

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Semukhin, Boris, Oleg Nekhoroshkov, Vasilii A. Klimenov, and Vasilii Muzalev. "Stress Formation and Stress Relief within Weld-Affected Zone." Advanced Materials Research 1013 (October 2014): 182–87. http://dx.doi.org/10.4028/www.scientific.net/amr.1013.182.

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The paper presents a formation of residual stresses near the weld-affected zone. It is shown that the residual stress values depend on load application and the type of weld joints. The proprietary know-how is suggested for the analysis of stress and strain state using measurement of the ultrasound velocity in weld joints under load. A correlation between effective and residual stresses is shown when testing the bridge crossing over the river Tom (Tomsk, Russia). A method of reducing these stresses using the ultrasonic impact treatment is suggested herein.

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Lomakin, E. V., and P. V. Tishin. "Constitutive relations for materials with strain state dependent properties." PNRPU Mechanics Bulletin, no. 1 (December 15, 2021): 52–62. http://dx.doi.org/10.15593/perm.mech/2021.1.06.

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Many materials demonstrate a dependence of mechanical properties on the type of stressed or deformed states. This is most noticeable in the dependence of the processes of shear and bulk deformation. Such materials include rocks, structural graphite, concrete, some grades of steel, cast iron, and aluminum. The main properties of these materials are an absence of a "single curve" relationship between the intensity of stresses and the intensity of deformations. Under shear conditions, bulk deformations can occur. Such materials can be described by constitutive equations that depend on the parameter of the type of a stress state, which is the ratio of the first invariant of the stress tensor to the stress intensity. Thus, these defining relations give the dependence of the strain tensor components on the stress tensor components. Such defining relations can be quite cumbersome, and therefore do not allow an analytical treatment to obtain defining relations that give the dependence of the components of the stress tensor on the components of the strain tensor. The paper proposes the constitutive relations obtained from the analysis of test results of various materials, which properties depend on the type of deformed state. Conditions are derived for material constants that ensure the uniqueness of the solution of boundary value problems. Based on experimental data obtained under the conditions of the proportional loading of various rocks: limestone and talcochlorite, as well as the results of mechanical tests of several grades of concrete, the constants of the mathematical model are determined. The results of the experimental studies are compared with theoretical dependencies predicted by the model. The limited applicability of the proposed constitutive relations is established.

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Macmillan, J. S., and Paul M. Valliant. "Occupational Stress and Behavioral Change." Perceptual and Motor Skills 64, no. 3_suppl (June 1987): 1061–62. http://dx.doi.org/10.2466/pms.1987.64.3c.1061.

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For 25 secretaries employed at Laurentian University, scores on the MMPI Depression Scale, State-Trait Anxiety Questionnaire, Self-esteem Inventory, Jenkins Activity Survey, and Occupational Stress Questionnaires showed no significant change in behavior associated with occupational stress. Characteristics ‘hard-driving’ and ‘speed-impatience’ were predictors of Type A behavior.

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Xue, Huan, Rong Feng Li, Rui Ge, Hong Chuan Zhu, and Wen Jie Peng. "Research Progress of Stress Superimposing Method for Residual Stress Determination." Advanced Materials Research 295-297 (July 2011): 2073–78. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.2073.

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The stress superimposing testing method of residual stress is different from the stress releasing way. A new stress field is introduced adding on the initial state. The residual stress is indentified by the strain increment differences of the material detected in the stress superimposing process. The traditional stress superimposing testing method including hardness and indentation method are reviewed. The principle and application of two new type of stress superimposing testing methods of residual stress are introduced, their disadvantages are also indicated.

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Andreev, Vladimir I. "Stress-Strain State of Weightless Inhomogeneous Array with Cylindrical Hole." Advanced Materials Research 919-921 (April 2014): 740–43. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.740.

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When creating underground pipelines, tunnels and other long cylindrical holes often used drilling-and-blasting method of penetration. Depending on the type of rock in the array may be local induration or sintering which results in increase in the deformation properties of the ground, or cracking resulting in a decrease in deformation properties. Thus the array becomes inhomogeneous. The article provides a calculation of the stress-strain state of array considering its local inhomogeneity.

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Vizcaino, Maricarmen. "Hatha Yoga Practice for Type 2 Diabetes Mellitus Patients: A Pilot Study." International Journal of Yoga Therapy 23, no. 2 (January 1, 2013): 59–65. http://dx.doi.org/10.17761/ijyt.23.2.b57106j138027205.

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Objective: This study was conducted to examine the impact of Hatha yoga on glycemic control, psychological and physiological stress, and self-care for individuals with type 2 diabetes mellitus (T2DM). Methods: Ten sedentary individuals with T2DM who were non-insulin dependent, free of diabetes-related complications, and had no previous yoga experience completed therapeutic yoga classes for 6 weeks, 3 times per week . Glycemic control measures included fasting blood glucose, glycated hemoglobin, and fasting insulin. The State-Trait Anxiety Inventory, Perceived Stress Scale, and salivary cortisol were used to assess levels of stress, and the Summary of Diabetes Self-care Activities questionnaire was used to assess regimen adherence. Results: No significant changes in glucose control or physiological stress were found; however, significant changes in perceived stress, state anxiety, and self-care behaviors were detected. Conclusions: Preliminary findings support further investigation of the benefits of Hatha yoga as a complementary therapy for those with T2DM.

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Bragov, A. M., A. K. Lomunov, and T. N. Yuzhina. "DYNAMIC COMPRESSIBILITY OF BIRCH AT DIFFERENT TYPES OF STRESS-STRAINED STATE." Problems of strenght and plasticity 82, no. 3 (2020): 269–82. http://dx.doi.org/10.32326/1814-9146-2020-82-3-269-282.

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The results of dynamic tests for compression across the fibers at room temperature of birch samples with air humidity are presented. Dynamic tests were carried out on a setup with a split Hopkinson bar according to the Kolsky method at a strain rate of ~2000 s–1. To assess the effect of the type of stress-strain state on the behavior of the material, in addition to specimens in the form of cylinders with its free expansion during loading (uniaxial stress state condition), specimens were tested in a rigid casing that prevents the radial expansion of the specimen (uniaxial deformation condition), as well as local compressive tests of rectangular board fragments. In the latter case, the material surrounding the loading zone plays the role of a compliant confining casing. In this case, a certain intermediate stress-strain state is realized in the sample. For these three types of stress-strain state, dynamic deformation diagrams were obtained with registration of additional loading cycles. Comparison of obtained deformation diagrams shows a significant effect of the type of stress-strain state on the behavior of the material under study. In the case of free expansion of the specimen in the radial direction, the absence of strain hardening is observed in the first loading cycle. In subsequent cycles, hardening is negligible. The deformation diagrams of specimens in the casing as well as board fragments are characterized by a noticeable increase in the modulus of the hardening branch with increasing deformation. In this case, it can be noted that the behavior of the material in the case of testing a piece of board is intermediate between the cases of uniaxial stress state and uniaxial strain state. Some mechanical characteristics of the material are determined using the diagrams obtained. The obtained experimental results can serve as the basis for the subsequent identification of the model of deformation and destruction of wood.

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Tseng, Yu-Jung, Richard Chapple, Tianyuan Hu, Kimal Rajapakshe, Kevin Hoegenauer, Cristian Coarfa, and Daisuke Nakada. "Hematopoietic Hierarchy Under Steady-State and Stress Conditions." Blood 134, Supplement_1 (November 13, 2019): 1181. http://dx.doi.org/10.1182/blood-2019-125110.

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The maintenance of the hematopoietic system by hematopoietic stem cells (HSCs) is an important topic in both clinical and basic hematology study due to their enormous therapeutic potential. The hematopoietic hierarchy has recently garnered renewed interest following the development of single-cell assays and improved strategies for genetic labeling, resulting in new hierarchical models that challenge the classical view of hematopoiesis. However, the kinetic of hematopoiesis under steady-state and stress condition and the contribution of HSCs toward steady-state hematopoiesis remain controversial and unclear. Using two tamoxifen-induced lineage tracing models, namely Fgd5-CreERT2/ROSA26-tdTomato and Krt18-CreERT2/ROSA26-tdTomato, we traced the contribution of HSCs to downstream blood cells. The initial labeling will occurred mostly within HSCs due to the largely restricted expression of Fgd5 and Krt18 in HSCs. Our preliminary data suggest that adult HSCs contribute robustly to steady-state hematopoiesis, exhibiting faster efflux toward platelets and myeloid lineages compared with lymphoid lineages. Interestingly, we found that myeloid cells and platelets were labeled rapidly after the initial HSC labeling without the appearance of the previously identified intermediate populations, suggesting the potential bypassing differentiation from HSCs to these lineages. In addition to steady-state hematopoiesis, we also investigated the response of the hematopoietic system to stress. Using the lineage tracing models mentioned above, we observed that HSCs are able to respond to stress to compensate the loss of a specific cell type, without affecting their contribution toward other lineages. For example, antibody-mediated platelet depletion resulted in a compensatory output from HSCs toward platelets. On the other hand, PHZ-induced hemolytic anemia led to an accelerated production of red blood cells. In both cases, other blood lineages remained unaffected compared to controls. In order to acquire a more comprehensive view of steady-state hematopoiesis, we combined Fgd5-CreERT2/ROSA26-tdTomato lineage tracing model with single-cell RNA-seq. To be inclusive of known and unknown HSPC populations, we sorted Lin-tdTomato+ cells at 1 week, 2 weeks and 1 month after the first tamoxifen treatment. HSCs, MPPs and HPC1/2 sorted from wild-type animals served as the reference groups. We observed the appearance of myeloid and megakaryocytic progeny as early as 1 week after the initial HSC labeling, suggesting the rapid contribution of HSCs toward these lineages. Erythroid-biased population emerged at the 2-week time point, with the expansion of myeloid progeny. Intriguingly, pseudo-time analysis revealed a relatively upstream position of erythroid-biased cluster, indicating the early emergence of erythroid progeny. The clear appearance of lymphoid progeny was absent until 1 month after the initial labeling, corresponding to the later onset of lymphoid differentiation. In summary, our results support the active role of HSCs in steady-state hematopoiesis and rapid output toward megakaryocytic, erythroid, and myeloid lineages from HSCs. Moreover, our data also provide insight into the responses of HSCs toward different stimuli, which can potentially contribute to our understanding of hematopoietic-related diseases and uncover novel treatment avenues. Disclosures No relevant conflicts of interest to declare.

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Rinaldi, Carmela, Luigi Donato, Simona Alibrandi, Concetta Scimone, Rosalia D’Angelo, and Antonina Sidoti. "Oxidative Stress and the Neurovascular Unit." Life 11, no. 8 (July 29, 2021): 767. http://dx.doi.org/10.3390/life11080767.

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The neurovascular unit (NVU) is a relatively recent concept that clearly describes the relationship between brain cells and their blood vessels. The components of the NVU, comprising different types of cells, are so interrelated and associated with each other that they are considered as a single functioning unit. For this reason, even slight disturbances in the NVU could severely affect brain homeostasis and health. In this review, we aim to describe the current state of knowledge concerning the role of oxidative stress on the neurovascular unit and the role of a single cell type in the NVU crosstalk.

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Budhu, Muniram. "Failure state of a sand in simple shear." Canadian Geotechnical Journal 25, no. 2 (May 1, 1988): 395–400. http://dx.doi.org/10.1139/t88-041.

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The stress state in many practical geotechnical problems is analogous to simple shear strain. However, the devices available to test soil samples in simple shear strain impose nonuniform stress and strain fields. Consequently, the interpretation of results from simple shear tests is often questioned. In this article, results of tests on loose and dense Leighton Buzzard sand from two specially instrumented simple shear devices–Cambridge University's device and a Norwegian Geotechnical Institute type–are used to interpret the failure mode and the failure stress state. The data were obtained from the centre of the samples, a region removed from stress concentrations. Failure was observed to be initiated on vertical planes and occurred very soon after shear displacement was applied. However, neither these vertical planes nor the horizontal planes were the planes of maximum stress obliquity mobilized during the tests. Key words: deformation, failure, loads, sand, shear tests, simple shear, stresses.

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Li, Cong Bo, and Zhen Feng Zhan. "Simulation Research for Bar-Type Composite Wall under Certain Bias Loads." Applied Mechanics and Materials 578-579 (July 2014): 797–800. http://dx.doi.org/10.4028/www.scientific.net/amm.578-579.797.

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It adopts the finite element analysis method, researches the stress state of the composite wall interface of bar-type composite wall structure just under the certain bias loads. The Bar-type composite wall structure under bias load, then the stress distribution rule of the windward side and leeward surface is near with the thermal insulation layer. On the wall, the stress is larger of the upper and below part of wall, the middle part of the interface tangential stresses are zero; the upper end wall supports the maximum interfacial normal stress.

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Cernescu, Anghel, Nicolae Faur, and Cristina Bortun. "Stress State Evaluation in Complete Denture by Electrical Resistance Strain Gage." Key Engineering Materials 601 (March 2014): 171–76. http://dx.doi.org/10.4028/www.scientific.net/kem.601.171.

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Total dentures are made of acrylic resins and artificial teeth. Among the prevalent fracture types of the dentures, 29% was a mid-line fracture, in which 68% were observed in maxillary complete dentures and 28% in mandibular complete dentures. Due to the large number of failures recorded on the maxillary dentures, several studies were conducted to establish the causes that produce these failures but also to find solutions for their prevention. One source of information about the strength of a maxillary denture under the applied load, is represented by the establishment of the stress and strain state during the loading. Different methods have been used for investigating the strain or stress distribution during deformation of dentures. The purpose of this paper is to evaluate the stress and strain state of a maxillary denture loaded in compression until the final fracture. For this study, electrical resistance strain gage were used for evaluation the strain and stress distribution in the maxillary denture made of different acrylic resins. Based on observations from practice, the strain gages were applied on the middle line of the denture at the base of the incisors and respectively on the sides of the denture, under molars. The dentures were loaded until failure and were registered the strains in the located strain gages. Also, for each type of acrylic resin were determined separately the mechanical properties of elasticity and strength. Based on the tests conducted were determined the critical stress and strain in the areas of interest. In all the tests carried out the fracture occurred in the median area of the denture and the crack was initiated between the incisor teeth. The stress and strain field associated with the crack initiation mode showed a strong influence of geometry on the fracture strength of denture. Also the type of acrylic resin has a significant effect on the fracture strength of complete denture either by strength capacity but especially by their ability to elasticity. Based on this analysis have been established new criteria for selection of acrylic resins, not only for aesthetic reasons but also for elasticity and strength reasons.

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Sergeev, M. S., M. V. Lukin, A. A. Strekalkin, and S. I. Roshchina. "Mathematical modeling of stress-strain state of the nodal joint of wooden beams." Journal of Physics: Conference Series 2131, no. 3 (December 1, 2021): 032088. http://dx.doi.org/10.1088/1742-6596/2131/3/032088.

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Abstract The article presents a study of the joint of wooden beams on a new type of aluminum composite connector. For the numerical experiment, beams with a cross-section of 150x220(h) mm made of solid wood were selected. The beams were connected at the same level in a perpendicular direction to each other. The connecting connectors were made of two types of alloys: 7075 T6 and 6061 T6. The experiment was carried out until the joint was completely destroyed under static load. The elastic operation of the node for different types of connectors under study was maintained until the load of 50… 70 kN, after which there was a sharp increase in the deformations of the beams. Conducting a numerical study of the elements of wooden structures made it possible to predict their behavior most accurately in real operating conditions.

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FROLOV, A. A., YU А. MOROZOV, and E. YU VERKHOV. "Stress state of a cantilever cable holder of the type CCH-3; 4; 6." Structural Mechanics of Engineering Constructions and Buildings 14, no. 1 (2018): 57–63. http://dx.doi.org/10.22363/1815-5235-2018-14-1-57-63.

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Timergaliev, Samat, and Aleksandr Uglov. "On the stress state of thin-walled isotropic building constructions of the shell type." IOP Conference Series: Materials Science and Engineering 890 (August 13, 2020): 012046. http://dx.doi.org/10.1088/1757-899x/890/1/012046.

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Cherevatskii, S. B., and E. M. Tsentovskii. "Stress-strain state and energy capacity of a shell-type accumulator of mechanical energy." Mechanics of Composite Materials 21, no. 4 (1986): 473–78. http://dx.doi.org/10.1007/bf00610897.

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Dadayan, Tigran, and Lusine Karapetyan. "Investigation of the Stress-Strain State of a Steel Column Base Connection for Seismic Regions." Key Engineering Materials 906 (January 11, 2022): 93–98. http://dx.doi.org/10.4028/www.scientific.net/kem.906.93.

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Currently, the main type of connection between a steel column and a reinforced concrete foundation is a steel base, which is often economically unprofitable due to its size, number or diameter of anchor bolts. Not only in Armenia, but also in most countries, a steel base is the main type of connection between a steel column and a reinforced concrete foundation. The usage of other types of connections is associated with both new calculation methods and technological problems. The possibility of computation and design of the connection of a steel column with a reinforced concrete foundation in seismically active regions using shear studs is considered in this work, a reinforced concrete section with longitudinal reinforcement is used for this type of connection which ensures a smooth transfer of forces from the column to the foundation. Based on the example of the connection of a single-story industrial building column shows the change in the stress-strain state of the connection under axial force and bending moments for seismic regions. Not only the feature and construction technology of the connection considered in the work, but also proposes a calculation method with future possibility of its subsequent inclusion in the building codes of the Republic of Armenia.

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Journal articles on the topic 'Type of stress state'

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