Dynamic model of closure the liner

Vacuum Pressure ◽

Design Parameters ◽

Radial Deformation ◽

Central Angle ◽

Radial Plane ◽

Working Length ◽

Annotation Purpose. Develop analytical dependences for modeling the speed and dynamics of deformation of liner depending on its design parameters and physical and mechanical characteristics, taking into account the technological parameters of the process. Methods. Based on the system of geometric equilibrium equations for a cylindrical shell, taking into account the isotropy of the medium and the momentless stress state, the spatial action of forces and pre-tension of the liner, developed analytical equations that allow modeling the dynamics of deformation of liner in time, which allows to determine the time constant of the system “liner – milking cup”. Results. Analytical dependences of the dynamics of deformation of liner in time in the radial plane and the rate of deformation depending on its design parameters and physical and mechanical characteristics of the material are developed. Parameters for deformation simulation are: R – radius of liner, Е – modulus of elasticity, ρ – the density of the rubber material, h – thickness of liner, рн – vacuum pressure, l – the length of the active part of liner, ν – Poisson's coefficient for rubber, Fн – force of tension of liner. Depending on the central angle in the radial plane of the section, the shape of the deformation of the liner is modeled along its entire working length during the closing and opening stroke. Conclusions. The obtained dependences allow to model the dynamics of deformation of liner in the radial plane depending on its design parameters and physical and mechanical characteristics of the material. The developed analytical dependences take into account the pre-tension of the liner, vacuum pressure and allows modeling depending on the central angle in the radial plane of the rubber section. The use of the developed analytical dependences makes it possible to substantiate the main parameters that affect the process of closing and opening of the liner. The characteristic of the deformation in the cross section of the largest deformation is that the tension of the liner does not affect the deformation characteristic. This is due to the isotropy property of the cylindrical shell and the elastic isotropic properties. Keywords: liner, vacuum pressure, modulus of elasticity, radial deformation, coordinate system, tension of rubber, the cylindrical shell, the isotropic medium.

Analytical model of liner with previous loads

Mehanization and electrification of agricultural ◽

10.37204/0131-2189-2019-9-12 ◽

2019 ◽

pp. 99-106

Author(s):

Dmytriv, V. ◽

Dmytriv, I. ◽

Krasnytsia, B.

Keyword(s):

Cylindrical Shell ◽

Analytical Model ◽

Modulus Of Elasticity ◽

Structural Parameters ◽

Vacuum Pressure ◽

Central Angle ◽

Radial Plane ◽

Working Length ◽

Preliminary Tension

Purpose. Development analytical model of the liner, taking into account its previous tension, structural and technological parameters and physical-mechanical characteristics of the rubber material, for modeling its deformations in the radial, longitudinal and circular planes. Methods. Analytical, mathematical modeling. Results. On the basis of the equilibrium equations for a cylindrical shell, taking into account the isotropy of the medium and the without momentary stress state, the spatial of forces and the preliminary tension of the liner, a system of analytic equations is developed that enables modelling of the deformations of the liner, which is the factor of its closure. The analytical dependences of the deformation of the liner in the longitudinal, circular and radial planes, depending on its structural parameters and physical and mechanical characteristics of the material, are developed. Parameters for deformation simulation are: R – radius of liner, Е – modulus of elasticity, h – thickness of liner, рн – vacuum pressure, l – the length of the active part of liner, ν – Poisson's coefficient for rubber, Fн force of tension of liner. Depending on the central angle in the radial plane of the section, the shape of the deformation of the liner is simulated along its entire working length. Conclusions. The obtained dependences allow simulating the deformation of the liner in the longitudinal, circular and radial planes, depending on its structural parameters and physical-mechanical characteristics of the material. The developed analytical dependences take into account the preliminary tension of the liner, the vacuum pressure and makes it possible to model, depending on the central angle in the radial plane of the cross-section of rubber. The use of developed analytical dependencies makes it possible to substantiate the basic parameters that influence the technological process of milk yield cows Keywords: liner, vacuum pressure, modulus of elasticity, radial deformation, coordinate system, tension of rubber, the cylindrical shell, the isotropic medium.

On the influence of the shaped charge liner manufacture technology on the high-speed element characteristics

Engineering Journal Science and Innovation ◽

10.18698/2308-6033-2020-10-2020 ◽

2020 ◽

Author(s):

V.I. Kolpakov ◽

N.A. Kudyukov

Keyword(s):

High Speed ◽

Physical And Mechanical Properties ◽

Shaped Charge ◽

Design Parameters ◽

Geometrical Parameters ◽

Liner Material ◽

Metal Spinning ◽

Cold Stamping ◽

The paper introduces the results of numerical simulation of the functioning of shaped charges, whose liners are made of different materials. As a result of their functioning, these charges form high-speed elements. Typically, liners for such charges are produced by the cold stamping technology. An alternative method for producing the liners is metal spinning. Moreover, a spin formed liner is expected to have higher physical and mechanical properties compared to a stamped liner made of the same material and having the same geometrical parameters. To reveal the patterns of molding high-speed elements from stamped and spin formed liners, the action of shaped charges comprised of steel or copper segmental liners of small bending, was simulated numerically using the apparatus of continuum mechanics. The influence of the liner manufacture method was taken into account by varying the values of the physical and mechanical characteristics of the liner material. The design parameters of the simulated charge, with the exception of the liner bending, during the calculation study remained unchanged and corresponded to the parameters of the currently used samples. Following the numerical experiments results, the study shows that the elements molded from spin formed liners are less likely to become fractured while being formed and are also more integral (continuous) in comparison to the elements molded from stamped shaped charge liners.

The Effect of Twisted Polymer Fiber on Physical and Mechanical Characteristics of Concrete C35

Journal of the Institute of Engineering ◽

10.3126/jie.v14i1.20076 ◽

2018 ◽

Vol 14 (1) ◽

pp. 126-135

Author(s):

Reza Mirzaei ◽

Naser Zarifmoghaddam

Keyword(s):

Tensile Strength ◽

Reinforced Concrete ◽

Modulus Of Elasticity ◽

Fiber Reinforced Concrete ◽

Polymer Fiber ◽

New Materials ◽

Concrete Mix ◽

Concrete as the most used material, is known as an integral part of construction. So far, many studies have been done in the field of improving the quality of concrete that most of them have examined change in concrete mix which is called concrete mix plan. However, the use of additives and also replacing commonly used materials in concrete with new materials always has been noteworthy. In this study, description of tests that have been done on fiber reinforced concrete will be discussed. Also, the condition of concrete mix plan will be discussed. Comparison between results of the tests showed that Forta reinforced concretes have more compressive, flexural and tensile strength and modulus of elasticity than normal and ordinary concretes.Journal of the Institute of Engineering, 2018, 14(1): 126-135

KARAKTERISTIK SIFAT FISIKA DAN MEKANIKA KAYU LAMINA KOMBINASI JENIS KAYU SENGON (Paraserianthes falcataria (L.) Nilsen) DAN JENIS KAYU MERBAU (Intsia spp.)

ULIN Jurnal Hutan Tropis ◽

10.32522/ujht.v2i2.1640 ◽

2018 ◽

Vol 2 (2) ◽

Author(s):

Kusno Yuli Widiati

Keyword(s):

Modulus Of Elasticity ◽

Urea Formaldehyde ◽

Class Ii ◽

Modulus Of Rupture ◽

Test Results ◽

Paraserianthes Falcataria ◽

Testing Method ◽

Physical And Mechanical Characteristics ◽

Adhesive Shear Strength

This study aims to determine the physical and mechanical characteristics of wood lamina combination of sengon wood and merbau with Melamine Urea Formaldehyde (MUF) adhesive. The testing method used is based on the DIN standard. The test results of the average lamina density of 0.58-0.73 g / cm3 at oven drying moisture content. Modulus of Elasticity (MoE), Modulus of Rupture (MoR) and value of compression parallel to grain highest found in the combination of merbau-sengon-merbau-sengon-merbau and the lowest in the combination of sengon-merbau-sengon. While the adhesive shear strength is the highest value in the combination treatment of merbau-merbau and the lowest in the combination of sengon-sengon. Based on the modulus of elasticity (MoE) of sengon treatment as face / back and merbau as core (3 and 5 layers) can be classified into strong class IV-V, merbau as face / back and sengon as core (3 and 5 layers) can be classified into strong class II-III. Modulus of Rupture (MoR) can be classified into strong class II-III and compression parallel to grain into strong class II.

The Processing of the Profile Surface of the Work-Pieces, Characterized by Low Rigidity

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.299.852 ◽

2020 ◽

Vol 299 ◽

pp. 852-860

Author(s):

Anatoly A. Fomin ◽

Vladimir G. Gusev ◽

Nail F. Timerbaev

Keyword(s):

Flexural Rigidity ◽

Geometric Error ◽

Technological System ◽

Design Parameters ◽

Work Piece ◽

Machined Surface ◽

Spindle Unit ◽

This work indicates that the prediction of the geometric indicators of the quality of the machined surface in the design of technological operations for milling a profile surface of work-pieces with low rigidity is possible, on the basis of an analysis of the elastic displacements of the technological system elements, the flexural rigidity of the work-piece as a function of its initial dimensions, the locating chart and the physical and mechanical characteristics of the material being processed. The article describes the characteristics of the elements of the technological system for the profile milling of work-pieces of low rigidity; The analytical dependencies linking the elastic displacements of the work-piece during the processing of various wood species with elements of the milling mode and the design parameters of the mill are given. Extreme total elastic displacements of the technological system during the cutting process are determined. Mathematical models of the maximum geometric error of the machined surface, as a function of the work-piece's flexural rigidity and the spindle unit, are established. Based on the results of the analysis, recommendations for improving the accuracy of the product were developed.

Creep of a heterogeneous polymer cylindrical shell

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1030/1/012091 ◽

2021 ◽

Vol 1030 (1) ◽

pp. 012091

Author(s):

Vladimir Andreev ◽

Batyr Yazyev

Keyword(s):

Cylindrical Shell ◽

Composite Materials ◽

Internal Pressure ◽

Structural Elements ◽

Filled Polymer ◽

Heterogeneous Polymer ◽

Abstract The article deals with the problem of calculating an heterogeneous cylindrical shell made of a filled polymer, which is in the process of creep under the action of constant internal pressure and temperature. The calculation is based on the Maxwell -Gurevich equation, which has been repeatedly tested in the calculations of structural elements made of polymer and composite materials. The dependence of the physical and mechanical characteristics of the material on temperature is taken into account.

PHYSICAL AND MECHANICAL SPECIFITIES OF “TENELIJA” STONE

Archives for Technical Sciences ◽

10.7251/afts.2019.1120.013m ◽

2019 ◽

Vol 1 (20) ◽

Author(s):

Kenan Mandžić ◽

Adnan Ibrahimović ◽

Enver Mandžić

Keyword(s):

Uniaxial Compression ◽

Compression Strength ◽

Modulus Of Elasticity ◽

Laboratory Testing ◽

Uniaxial Compression Strength ◽

Influence Of Water ◽

Low Modulus ◽

Uniaxial Strength ◽

Stone “Tenelija” is categorized as oolitic limestone. This stone was used to build a number of constructions in Herzegovina, and one of the most famous is the “Old Bridge” in Mostar. The stone is characterized by its specific physical and mechanical characteristics. Stone “Tenelija” has low uniaxial compression strength, low modulus of elasticity, large porosity, big influence of water on its uniaxial strength, and yet many objects that were built hundreds of years ago, form this rock, still stand. The paper presents the laboratory testing of physical and mechanical characteristics of the samples of various sizes, with all specificities. Also, mutual correlations of the results was analyzed and presented.

THE INFLUENCE OF CLIMATIC AGEING ON THE PROPERTIES OF PCM-BASED EPOXY RESIN SYSTEMS

Proceedings of VIAM ◽

10.18577/2307-6046-2021-0-3-128-136 ◽

2021 ◽

pp. 128-136

Author(s):

A.A. Evdokimov ◽

◽

A.P. Petrova ◽

K.A. Pavlovskiy ◽

I.N. Gulyaev ◽

...

Keyword(s):

Glass Transition ◽

Transition Temperature ◽

Glass Transition Temperature ◽

Carbon Fiber ◽

Epoxy Resin ◽

Modulus Of Elasticity ◽

Vinyl Ester ◽

Subtropical Climate ◽

The article presents the results of studies of the properties of carbon fiber of the VKU-51 brand and fiberglass of the VPS-58 brand, made on the basis of the epoxy vinyl ester binder of the VSV-43 brand, after exposure in full-scale conditions of moderate and subtropical climate for 5 years with intermediate removals after 1 and 3 years. Physical and mechanical characteristics (strength and modulus of elasticity under tension, compression and bending) and glass transition temperature are determined. Studies have shown a high preservation of properties at 20 °C: 90–100% in VKU-51 and 73–100% in VPS-58, depending on the type of test.