scholarly journals Experimental studies of the materials strength properties of magazine materials of explosive reactive complexes for drilling the rocks of the different strength categories

2019 ◽  
Vol 20 ◽  
pp. 119-123
Author(s):  
Mikhail Kelner ◽  
Maxim Pugachev ◽  
Nikolay Ovchinnikov
Keyword(s):  
Experimental Studies ◽  
Strength Properties

Experimental Studies Of Multilayer Glass Structures On Compression, Compression With Bending And Simple Bending

2019 ◽  
pp. 22-30
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Applied Load ◽  
Experimental Studies ◽  
Strength Properties ◽  
Research Topic ◽  
Normative Values ◽  
Laminated Glass ◽  
The Cross ◽  
Experimental Values

The work of multilayer glass structures for central and eccentric compression and bending are considered. The substantiation of the chosen research topic is made. The description and features of laminated glass for the structures investigated, their characteristics are presented. The analysis of the results obtained when testing for compression, compression with bending, simple bending of models of columns, beams, samples of laminated glass was made. Overview of the types and nature of destruction of the models are presented, diagrams of material operation are constructed, average values of the resistance of the cross-sections of samples are obtained, the table of destructive loads is generated. The need for development of a set of rules and guidelines for the design of glass structures, including laminated glass, for bearing elements, as well as standards for testing, rules for assessing the strength, stiffness, crack resistance and methods for determining the strength of control samples is emphasized. It is established that the strength properties of glass depend on the type of applied load and vary widely, and significantly lower than the corresponding normative values of the strength of heat-strengthened glass. The effect of the connecting polymeric material and manufacturing technology of laminated glass on the strength of the structure is also shown. The experimental values of the elastic modulus are different in different directions of the cross section and in the direction perpendicular to the glass layers are two times less than along the glass layers.

scholarly journals RESEARCH OF PHYSICAL AND MECHANICAL PROPERTIES OF WOOD-FIBER MATERIALS

2020 ◽  
pp. 451-457
Author(s):  
Aleksandr Yur'yevich Vititnev ◽  
Yuriy Davydovich Alashkevich ◽  
Natal'ya Geral'dovna Chistova ◽  
Roman Aleksandrovich Marchenko ◽  
Venera Nurullovna Matygullina
Keyword(s):  
Mechanical Properties ◽  
Wood Fiber ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Production Method ◽  
Strength Properties ◽  
Grinding Process ◽  
Technological Parameters ◽  
Fiber Materials ◽  
Traditional Construction

This paper presents the results of experimental studies of the physical and mechanical properties of wood-fiber boards of the wet production method when regulating the design and technological parameters of the grinding process. This allowed us to determine the influence of the working clearance between the grinding discs and the concentration of fibre mass with the subject to of quality change wood fiber after defibrator using the developed construction of the disc fibrillation action on the physico-mechanical properties of boards. As a result of the experiment, regression models were obtained that adequately describe the studied grinding process and allow predicting the values of physical and mechanical properties of the finished product depending on the established  parameters process. A comparative analysis of the size and quality characteristics of the fiber semi-finished product and its fractional composition when using a developed construction the disc of refiner fibrillation action and a traditional design used in industry is carried out. The preferential efficiency of the grinding process under the fibrillating effect the disc of refiner in comparison with the traditional construction disc of refiner is established. As a result, there is a significant improvement in the quality indicators of the fiber semi-finished product and its composition due to the formation and predominance in the total mass of long and thin, respectively, flexible fibrillated fibers with high tile-forming properties, which allows to increase the strength properties of the product (by 20–25%), without using binding resins.

Experimental Study of Mechanical Properties of Fiber of Deep-Sea Mooring Cables

2011 ◽  
Vol 130-134 ◽  
pp. 1712-1715
Author(s):  
Gai Li Zhou ◽  
Linan Li ◽  
Shui Jiao Li ◽  
Shi Bin Wang
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Deep Sea ◽  
Performance Test ◽  
Breaking Strength ◽  
Fiber Strength ◽  
Experimental Studies ◽  
Strength Properties ◽  
Mooring Lines ◽  
Strength Performance

In order to learn the mechanical properties of deep-sea mooring lines, experimental studies involved in strength properties have been carried out in this thesis. In the fiber strength performance test, the small force-large deformation experimental device has been designed and optimized. As the fiber diameter is very small (about 40μm), microscope is chosen to measure the diameter. The intensity curve of fiber is divided into three typical phases. The yield strength, breaking strength and elastic modulus in initial stage can be calculated and the elastic modulus is basically a constant. With the increasing of loading rate, the breaking force reduces and gradually tends to stabilize. It has got the formula, breaking strength ∝.

scholarly journals Design, Simulation and Optimization of an Additive Laser-Based Manufacturing Process for Gearbox Housing with Reduced Weight Made from AlSi10Mg Alloy

Metals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 67
Author(s):  
Liubov Magerramova ◽  
Vladimir Isakov ◽  
Liana Shcherbinina ◽  
Suren Gukasyan ◽  
Mikhail Petrov ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Strength Properties ◽  
Body Parts ◽  
The Finite Element Method ◽  
Technological Parameters ◽  
Simulation And Optimization ◽  
Precision Casting ◽  
Production Techniques ◽  
Material Forming ◽  
Physical And Mechanical Characteristics

The gas turbine engine's (GTE) development aims for the increasing the efficiency, strength, reliability and safety of its components. To create competitive engines, housing parts and components with high functionality and reduced weight are needed. Especially difficult in the design and production are the gearboxes for aviation GTE. Traditional technologies based on precision casting or material forming operations have significant limitations due to the complexity of fulfilling multiple different requirements. Nowadays, one of the progressive production techniques is additive manufacturing. The article presents the results of computational and experimental studies that substantiate the applicability of laser additive technology to reduce the mass of body parts by up to 15% while ensuring their strength properties. The physical and mechanical characteristics of aluminum alloys acceptable for the manufacturing of housing parts were analyzed. The necessary characteristics of the powder alloy of the Al-Si system and the technological parameters of the L-PBF of the modified housing of the gear reducer are established. Using the finite element method (FEM) the L-PBF process was numerically simulated and the technological modes for synthesis of the AlSi10Mg alloy powder were optimized. With the help of a serial 3D printer ProX320DMP, the prototype of a gear housing was manufactured.

scholarly journals Изгиб и растяжение судовых композитных элементов

2020 ◽  
Author(s):  
S.I. Koryagin ◽  
O.V. Sharkov ◽  
N.L. Velikanov
Keyword(s):  
Polymer Coating ◽  
Experimental Studies ◽  
Adhesive Layer ◽  
Polymer Coatings ◽  
Breaking Load ◽  
Strength Properties ◽  
Concentrated Force ◽  
Mechanical Destruction ◽  
Metal Structures ◽  
Reinforced Polymer

Полимерные покрытия давно и прочно завоевали свое место при изготовлении и ремонте судовых конструкций. Одной из причин, сдерживающих их более широкое применение, является отсутствие расчетных зависимостей, позволяющих рассчитать прочностные свойства композитных элементов. Для построения этих зависимостей необходимы дальнейшие экспериментальные исследования, их анализ и обобщение. В работе представлены результаты исследований прочностных свойств металлических конструкций судов с армированным полимерным покрытием при растяжении и изгибе. Экспериментально было установлено, что разрушение покрытия происходило при линейных деформациях основы на границе адгезионного слоя. При загрузке образца сосредоточенной силой определены усилия, при которых произойдет механическое разрушение композиционного образца по адгезионному слою. Построены зависимости разрушающей нагрузки от соотношения толщин основы и покрытия при растяжении и изгибе, проведено сравнение с экспериментальными результатами.Polymer coatings have long and firmly won their place in the manufacture and repair of ship structures. One of the reasons restraining their wider application is the lack of computational dependencies that allow to calculate the strength properties of composite elements. Further experimental studies, analysis and generalization are needed to construct these dependencies. The paper presents the results of studies of strength properties of metal structures of ships with reinforced polymer coating under tension and bending. It was found experimentally that the destruction of the coating occurred during linear deformations of the substrate at the boundary of the adhesive layer. When loading a sample with a concentrated force, the forces at which the mechanical destruction of the composite sample along the adhesive layer will occur are determined. The dependences of the breaking load on the ratio of the thickness of the substrate and the coating under tension and bending are constructed, a comparison with the experimental results is carried out.

Utilization of Galvanic Enterprises Sewage

2021 ◽  
Vol 1038 ◽  
pp. 282-289
Author(s):  
Ludmyla Chernyshova ◽  
Sergei Movchan ◽  
Stepan Epoyan
Keyword(s):  
Aluminum Oxide ◽  
Water Resistance ◽  
Experimental Studies ◽  
Strength Properties ◽  
Test Results ◽  
Specific Density ◽  
Phosphoric Acids

A method for obtaining refractories based on inorganic glue as a reaction product of sludge from electroplating shops with sulfuric and phosphoric acids, which was tested by the authors in laboratory and industrial conditions in the article, is presents. After drying at a certain temperature, the manufactured samples are tested for strength. Properties of refractories based on inorganic glue are characterized by increased water resistance due to treatment with a cement solution. Based on experimental studies, the authors are presents the results of testing samples for strength with dry and wet aluminum-oxide abrasive. According to the test results, it was found that the specific density of the obtained samples increased from 0,57 to 0,9 g/cm3 with increasing glue content, while the strength decreased. Compositions with a low glue content had for the most strength.

PERSPECTIVE POLYMERIC COMPOSITE NANOMATERIAL FOR FIXING OF DETAILS OF BEARING KNOT IN AUTOTRACTOR TECHNICS TRANSMISSION

2016 ◽  
Vol 3 (1) ◽  
pp. 515-519
Author(s):  
Рожнов ◽  
A. Rozhnov ◽  
Ли ◽  
R. Li
Keyword(s):  
Experimental Studies ◽  
Polymeric Composite ◽  
Strength Properties ◽  
Polymerization Process ◽  
Polymeric Composition ◽  
Composite Nanomaterial

This article describes the technique and results of the experimental studies deformation-strength properties of glutinous connections of polymeric nanocomposition on the basis of anaerobic sealant AN-111. Results of polymerization process researches of anaerobic sealant AN-111 and polymeric composition on its basis are presented.

Evaluation of Durability of Haulage System Based on Low Fatigue Cycle Test and FEM Analysis

2015 ◽  
Vol 237 ◽  
pp. 227-232
Author(s):  
Jarosław Piekło ◽  
Maria Maj ◽  
Robert Żuczek ◽  
Adam Zachura
Keyword(s):  
Gear Tooth ◽  
Experimental Studies ◽  
Fem Analysis ◽  
Basic Research ◽  
Strength Properties ◽  
Fatigue Tests ◽  
Steel Alloy ◽  
Number Of Cycles ◽  
Highly Loaded ◽  
Haulage System

The use of the innovative design of gears segments of drivetrain engine of a longwall shearer’s haulage system with highly loaded components has improved tribological pairs of gear-tooth. The elimination of structurally complex sets of gears allowed to reduce the cost of individual component of the system, reduction of the failure rate and significantly improve the processes of repair and maintenance. The article presents the results of experimental and numerical analysis of stress and strain variables in highly loaded gear element of haulage system. The experimental studies of L20HGSNM steel alloy from which the casting was produced included basic research of strength properties of the material and two types of fatigue tests: in the range of a small number of cycles - a classic LFC and modified MLCF test. Acquired material properties of the steel alloy allowed to create material characteristics and fatigue strength curve, which were used in FEM calculations. Based on the results of numerical calculations and multiaxial criteria the fatigue life of the casting gears were evaluated.

scholarly journals Parametric studies on the workability and compressive strength properties of geopolymer concrete

2018 ◽  
Vol 27 (3-4) ◽  
Author(s):  
S. Nagajothi ◽  
S. Elavenil
Keyword(s):  
Compressive Strength ◽  
Setting Time ◽  
Experimental Studies ◽  
Strength Properties ◽  
Geopolymer Concrete ◽  
Low Carbon ◽  
Natural Sand ◽  
Curing Conditions ◽  
Manufactured Sand ◽  
Binder Ratio

AbstractGeopolymer concrete is a booming technology in the construction industry. Much research is occurring in geopolymer concrete, as it emits low carbon dioxide into the atmosphere, is eco-friendly material and is an alternative for cement. This research mainly focuses on the use of fly ash based geopolymer concrete in ambient curing conditions and the use of manufactured sand due to the scarcity of natural sand. Mainly studies have evolved on the workability, setting time and compressive strength by the effect of ground granulated blast furnace slag (GGBFS), manufactured sand (M-sand), alkaline activator solutions to binder ratio and the proportions of sodium silicate to sodium hydroxide (SS/SH) in geopolymer concrete and mortar. The experimental studies were carried out using nine geopolymer concrete mixes and the comparisons were made. The workability of concrete decreases by increasing the percentage of GGBFS, M-sand and the proportions of SS/SH whereas workability of concrete increases when increasing the alkaline liquid to binder ratio. The compressive strength of geopolymer mortar and concrete increases when the percentage of GGBFS and M-sand is increased, and it decreases by increasing the alkaline liquid content. There is no change in strength by decreasing the proportions of SS/SH.

A method for determining the generalized energy grindability index of particulate solids

1970 ◽  
Author(s):  
Vladimir P. Zhukov ◽  
Dmitriy А. Osipov ◽  
Vadim E. Mizonov ◽  
Dariusz Urbaniak
Keyword(s):  
Computational Analysis ◽  
Bulk Material ◽  
Experimental Studies ◽  
Strength Properties ◽  
Grinding Process ◽  
Particle Sizes ◽  
Actual Problem ◽  
Particulate Solids ◽  
Wide Range ◽  
Low Efficiency

To calculate and evaluate the efficiency of the processes of fractionation of particulate solids, various industry methods have been developed that are widely and successfully used for the analysis of specific industrial technologies. Different indicators are used to measure the strength properties of particles of a bulk material in various industrial technologies. The disadvantage of the situation is the complexity, and often the impossibility of using these specific indices of strength of materials for calculating the grinding process in new equipment or a new range of particle sizes. Significant energy consumption for grinding at low efficiency of industrial mills causes the necessity of carrying out the studies aimed to increasing the efficiency of fractionation of particulate solids. In connection with this, the actual problem of scientific research to develop a generalized and universal energy indicator of grindability particulate solids and a method for its determination that can be used to describe the grinding process and to evaluate its efficiency in various industrial technologies for a wide range of materials arises.Calculation studies were carried out within the framework of the thermodynamic approach to model a grinding process. In order to carry out experimental studies, a special program for measuring and processing experimental data obtained at the laboratory impact mill was developed.In the course of computational and experimental studies, a technique has been proposed to determine the energy grindability index of particulate solids. The relation of this index with the energy necessary for breakdown of the intermolecular bonds in the material under study is established.The carried out researches allowed substantiating the method of determining the generalized energy grindability index of particulate solids. Computational analysis showed that the technique with acceptable accuracy for engineering calculations can be used in practice to assess the possibility of enrichment of heterogeneous components and to determine the optimal technological conditions for the separation of these components.

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