Experimental studies of the bischofite deformation properties

2020 ◽  
pp. 5-15
Author(s):  
Yu.V. Osipov ◽  
A.E. Koshelev ◽  
A.S. Voznesenskii
Keyword(s):  
Experimental Studies ◽  
Deformation Properties

Experimental Studies of Fiber-Reinforced Concrete under Axial Tension

2021 ◽  
Vol 1038 ◽  
pp. 323-329
Author(s):  
Zlata Holovata ◽  
Daria Kirichenko ◽  
Irina Korneeva ◽  
Stepan Neutov ◽  
Marina Vyhnanets
Keyword(s):  
Reinforced Concrete ◽  
Experimental Studies ◽  
Fiber Reinforced Concrete ◽  
Load Application ◽  
Fiber Reinforced ◽  
Large Aggregate ◽  
Second Stage ◽  
Axial Tension ◽  
Deformation Properties ◽  
Fiber Concrete

The design of a stand for testing concrete and fiber-reinforced concrete specimens-"eight" in tension, which provides axial load application and minimizes the effect of stress concentration at the ends of the specimen. The design of the stand is such that the distance between the axis of load application and the central hinge is 108 cm, and between this hinge and the axis of the test specimen is 21 cm, as a result of which the load transferred to the specimen is 5.143 times greater than the applied one. At the first stage of testing, it was found that the optimal characteristics of the fiber-concrete mixture is a matrix with a large aggregate ≤ 10 mm with 1.0% fiber reinforcement. At the second stage, the ultimate strength of fiber-reinforced concrete for axial tension was determined - 1.28 MPa when reinforced with wave fiber and 1.37 MPa when reinforced with anchor fiber, which amounted to 4.1% and 4.4% of compressive strength, respectively. It was also found that concrete reinforced with anchor fiber has higher deformation properties than concrete reinforced with wave fiber.

Studies of Magnetically Active Silicone Elastomers on a Vibrostend

2021 ◽  
Vol 1037 ◽  
pp. 141-147
Author(s):  
Andrey Minaev ◽  
Juri Korovkin ◽  
Hammat Valiev ◽  
G.V. Stepanov ◽  
Dmitry Yu. Borin
Keyword(s):  
Magnetic Field ◽  
Field Effect ◽  
Dynamic Properties ◽  
Experimental Studies ◽  
Magnetic Field Effect ◽  
Magnetorheological Elastomer ◽  
Silicone Elastomers ◽  
Damping Coefficients ◽  
Deformation Properties ◽  
The Magnetic Field

Experimental studies magnetorheological elastomer specimens dynamic properties under the magnetic fields action on the vibrostend are carried out. Amplitude-frequency characteristics have been obtained. The magnetic field effect on the silicone magnetoreactive elastomers deformation properties and damping coefficients experimentally is established.

Experimental Studies on Mechanical Properties of Rock Joints under Dynamic Loading

2006 ◽  
Vol 326-328 ◽  
pp. 1709-1712 ◽  
Author(s):  
Hai Bo Li ◽  
Hai Peng Feng ◽  
Bo Liu ◽  
Jun Ru Li
Keyword(s):  
Mechanical Properties ◽  
Normal Stress ◽  
Rock Joint ◽  
Experimental Studies ◽  
Shear Stiffness ◽  
Shear Velocity ◽  
Rock Joints ◽  
Normal Stresses ◽  
Deformation Properties ◽  
Strength And Deformation

In order to study the strength and deformation properties of rock joint under different shear velocities, normal stresses and undulation angles, series testes are conducted by a RMT-150C testing machines with artificial concrete rock joint samples in the present paper. Base on the experimental results, it can be found that the peak shear strengths decrease with the increment of shear velocity, and the decreasing rates tend to decrease with the increasing shear velocity. The shear strength of rock joints increase with the increasing undulation angles, and linearly increase with the increment of normal stress. It is also indicated that the shear stiffness increase with the increasing normal stress, undulation angle as well as the shear velocity with a decreasing tendency.

scholarly journals THE INFLUENCE OF LATERAL PRESSURE ON THE DEFORMATION CHARACTERISTICS OF THE SOIL

2021 ◽  
Author(s):  
З.М. Жамбакина ◽  
Т.К. Куатбаева ◽  
У.К. Акишев ◽  
Н.Б. Сарсенбаев ◽  
С.Т. Ауесбек
Keyword(s):  
Poisson’S Ratio ◽  
Lateral Pressure ◽  
Pressure Coefficient ◽  
Experimental Studies ◽  
Poisson's Ratio ◽  
Deformation Characteristics ◽  
Initial Stress State ◽  
General Process ◽  
Lateral Pressure Coefficient ◽  
Deformation Properties

В статье приведены результаты экспериментальных исследований коэффициента бокового давления в условиях компрессии и деформационных характеристик Е и ν (модуль общей деформации и коэффициент Пуассона). По существующим методикам расчета осадок оснований, коэффициент Пуассона рекомендуется принимать постоянным в зависимости от вида грунта. Неточность такого подхода иллюстрируется проведенными авторами исследованиями по определению коэффициента бокового давления, который зависит от физических свойств (плотности, влажности, гранулометрического состава и др.) и начального напряженного состояния грунта. Показано влияние способа определения коэффициента бокового давления и соответственно коэффициента Пуассона при расчете деформационных свойств грунтов и границы применения обобщенного закона Гука. В реальных условиях, распределение напряжений от внешней нагрузки и сжатие по центральной оси близко к условиям компрессии, но общий процесс деформирования основания обусловлен как боковыми так и вертикальными деформациями, которые характеризуются коэффициентом поперечного расширения ν. The article presents the results of experimental studies of the lateral pressure coefficient under compression and deformation characteristics E and ν (modulus of total deformation and Poisson's ratio). According to the existing methods for calculating the settlement of foundations, it is recommended to take Poisson's ratio constant depending on the type of soil. The inaccuracy of this approach is illustrated by the studies carried out by the authors to determine the lateral pressure coefficient, which depends on the physical properties (density, moisture, particle size distribution, etc.) and the initial stress state of the soil. The influence of the method for determining the lateral pressure coefficient and, accordingly, Poisson's ratio in calculating the deformation properties of soils and the limits of application of the generalized Hooke's law is shown.In real conditions, the distribution of stresses from an external load and compression along the central axis is close to the compression conditions, but the general process of deformation of the base is caused by both lateral and vertical deformations, which are characterized by the coefficient of transverse expansion ν.

scholarly journals EFFECT OF DRY DEFIBRATION OF RECOVERED PAPER ON MULTILAYER CARDBOARD PROPERTIES

2020 ◽  
pp. 251-260
Author(s):  
Tomas Shreinner ◽  
Haral'd Grossmann ◽  
Nikolay Petrovich Midukov ◽  
Viktor Sergeyevich Kurov ◽  
Aleksandr Semenovich Smolin
Keyword(s):  
Industrial Development ◽  
Paper Industry ◽  
Experimental Studies ◽  
Partial Replacement ◽  
Preparation Technique ◽  
Mechanical Parameters ◽  
Deformation Properties ◽  
Reduction Of Energy Consumption ◽  
Reduction Cost ◽  
Maximum Content

The article focuses on the relevant for the pulp and paper industry in the direction of reduction of energy consumption for the production of cardboard from recovered paper with the preservation of its mechanical parameters. The reduction cost is due to the partial replacement of the technology of traditional conventional preparation of the recovered paper with dry defibration. The dry defibration method affects the structural, mechanical and deformation properties of the cardboard. The purpose of the work is to obtain dependencies, listed characteristics on recovered paper content prepared by dry method. In order to maintain the mechanical and deformation properties of the cardboard when adding dry-defibrated fibers, it is necessary to correctly distribute them in the test liner layers and to set the stage of supply of dry-defibrated recovered paper into the process flow. To this end, various applications of the dry recovered paper preparation technique were experimentally analyzed, fed to and ground in an aqueous medium, and dry fibers were used to form a two-layer and three-layer test-liner cardboard. The maximum content of fibers prepared by the dry method to obtain a multilayer test-liner was 50% by weight of the cardboard, even though the main mechanical parameters, including tensile strength, bending stiffness, and short-span compression strength (SCT), changed slightly. Established optimal composition of cardboard, allowed using the results of experimental studies for industrial development. The article also provides a technical and economic estimation of different ways of dry defibration technology.

scholarly journals Geomechanical Assessment of the Effect of Inhomogeneities on the Propagation of Hydrofractures in Coal Seams

2019 ◽  
Vol 105 ◽  
pp. 01046
Author(s):  
Mikhail Baev ◽  
Veniamin Khyamyalyaynen ◽  
Aleksandr Shevtsov
Keyword(s):  
Fly Ash ◽  
Physical Modeling ◽  
Fluid Pressure ◽  
Experimental Studies ◽  
Sand Fly ◽  
Hydraulic Fractures ◽  
Coal Seams ◽  
Rupture Plane ◽  
Deformation Properties

The article gives a theoretical propagation of the development of hydrofractures in coal seams from the position of geomechanics, including the possibilities and conditions for the fracture to intersect a natural crack. A technique is proposed for carrying out experimental studies of the effect of inhomogeneities on the extension of hydraulic fractures by physical modeling on samples of equivalent materials and the facility for their conduct. The results of experiments based on the proposed technique on samples made on the basis of cement, sand, fly ash, and water are presented, with modeling of inhomogeneities of various types. The results made it possible to conclude that when the closed cavities intersect in the form of gaping cracks of limited prevalence, their rupture fluid envelops with the preservation of the rupture plane. It is noted that when crossing unbounded gaping cracks, the established enveloping phenomenon will obviously occur along the “bridge” at the points of contacts of the opposite banks of cracks that take place in a real massif, and the very intersection of the fracture of the natural crack, mainly, depends on its deformation properties, the magnitude of the angle between the planes of the fracture and the crack, and also the fluid pressure.

scholarly journals Study of the tensile properties of materials for clothing

2020 ◽  
Vol 77 (3) ◽  
pp. 280-286
Keyword(s):  
Tensile Properties ◽  
Experimental Studies ◽  
Deformation Properties ◽  
Properties Of Materials ◽  
Materials Used ◽  
Residual Deformations

The article is devoted to the study of the nature and magnitude of deformations in the materials used in the details of shoulder clothing. Experimental studies were performed under the double-walled impact of a tangential deformable load to determine the values f residual deformations. As a result of experimental studies of the deformation properties of samples of coat fabrics, the values of residual deformations are obtained for various load cases. The results of experimental studies are recommended for use in the appointment of constructive increases.

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