Isothermal Backward Extrusion of Thick-Walled Anisotropic Pipe Blanks in Mode of Short-Time Creeping

2016 ◽  
Vol 684 ◽  
pp. 143-151
Author(s):  
Sergey Sergeevich Yakovlev ◽  
Aleksey Alekseevich Perepelkin ◽  
Andrey Aleksandrovich Pasynkov
Keyword(s):  
Mechanical Properties ◽  
Mathematical Model ◽  
Material Flow ◽  
Theoretical Research ◽  
Technological Parameters ◽  
Cylindrical Anisotropy ◽  
Backward Extrusion ◽  
Pipe Blanks ◽  
Short Time ◽  
Geometrical Dimensions

Provided here is a mathematical model of the operation of backward extrusion in the mode of short-time creeping of thick-walled pipe blanks made out of orthotropic material with cylindrical anisotropy of the mechanical properties. Carried out was theoretical research of the operation of isothermal axisymmetric backward extrusion of thick-walled pipe blanks made out of anisotropic materials by conic point-tool in the mode of short-time creeping. Established were regularities regarding the change of material flow kinematics, regarding the stressed and strained condition of the blank, regarding force modes and limit possibilities of deformation depending on the technological parameters, on friction conditions on the contact surfaces of the operating tools and of the blank, regarding the geometrical dimensions of the blank and of the manufactured part, and of the anisotropy of the mechanical properties of the blank material, that on the basis of the developed mathematical model of isothermal non-radial flow of anisotropic material under conditions of axisymmetric stressed and strained conditions in the mode of short-time creeping. Experimental operations were carried out for isothermal backward extrusion of thick-walled pipe blanks made out of АМг6 aluminum and ВТ6С titanium alloys. Comparing the results of theoretical and experimental data for force modes of the operation of isothermal backward extrusion of thick-walled pipe blanks points to their satisfactory similarity (difference not exceeding 5% - 10%).

Combined Isothermal Drawing of Axissymmetrical Parts Made out of Anisotropic Materials in Mode of Short-Time Creeping

2016 ◽  
Vol 684 ◽  
pp. 152-164
Author(s):  
Sergey Sergeevich Yakovlev ◽  
Olga Vasilievna Pilipenko ◽  
Andrey Aleksandrovich Pasynkov
Keyword(s):  
Mechanical Properties ◽  
Experimental Research ◽  
Anisotropic Material ◽  
Stress Condition ◽  
Anisotropic Body ◽  
Anisotropic Materials ◽  
Age Hardening ◽  
Technological Parameters ◽  
Short Time ◽  
Anisotropy Of Mechanical Properties

Shown are results of theoretical and experimental research of force modes and limit possibilities of the first and subsequent operations of combined isothermal drawing of axisymmetric parts made out of anisotropic materials through conic and radial matrixes in the mode of short-time creeping. Studied was straining of anisotropic material under conditions of short-time creeping. We ignore the elastic components of strain. We introduced potential straining speeds for an anisotropic body under conditions of short-time creeping. Found was the effect of technological parameters, anisotropy of mechanical properties, and of age-hardening upon the stress condition, the force modes of the operation, and upon the design margin of strain during the first and subsequent operations of combined drawing. Experimental research was carried out for the force conditions and possible limits of straining during the first and second operations of combined isothermal drawing with convex-face and conic matrices in the mode of short-time creeping. Comparing the results of theoretical and experimental research for force modes and strain limits during the first and subsequent operations of combined drawing has shown their satisfactory similarity (up to 5% - 10%).

Mathematical Model for Axial Crushing of Hybrid Square Tubes

2011 ◽  
Vol 471-472 ◽  
pp. 664-669 ◽  
Author(s):  
H. Akbarshahi ◽  
Mojtaba Sadighi ◽  
Morteza Shakeri ◽  
M. Mirzaei
Keyword(s):  
Mechanical Properties ◽  
Mathematical Model ◽  
Wave Length ◽  
Axial Loading ◽  
Metal Composite ◽  
Metal Tube ◽  
Collapse Mode ◽  
Predicted Values ◽  
Geometrical Dimensions ◽  
Good Agreement

In this paper, to investigate energy absorption capability of hybrid (metal-composite) square tubes under axial loading, a new theory is proposed based on collapse mode of metal square tubes and considering off-axis strength of each layer of composite. An expression is derived for mean crushing load and folding wave length in terms of mechanical properties and geometrical dimensions of metal tube and composite prepregs wrapped around it. To validate the theoretical model, predicted values for mean crushing load are compared with experimental and numerical results that show reasonably good agreement.

Physical and mathematical models of ballast bed tamping via rotary device

2016 ◽  
pp. 5-16
Author(s):  
Nikita Polyanichko
Keyword(s):  
Mathematical Model ◽  
Mathematical Models ◽  
Operation Mode ◽  
Practical Importance ◽  
Theoretical Research ◽  
Technological Parameters ◽  
Physical Experiments ◽  
Physical And Mathematical Models ◽  
The Mathematical Model ◽  
Rotary Device

Objective: To develop a mathematical model and program for defining rational technological parameters and operation mode of a rotary device for tamping the ballast bed in the tie space area. Establish the veracity of calculations performed using the mathematical model and program developed via mathematical and physical experiments. Methods: Experimental and theoretical research conducted. Results: Established veracity of the mathematical model and program for calculating the technological parameters and operation mode of the device for tamping the ballastbed in the tie space area. Practical importance: The program developed provides the ability to select rational technological parameters and operation mode for the device. It is recommended that it be used when creating tools for ballast bed solidification in the ballast box area.

scholarly journals THEORETICAL RESEARCH OF THE SCAFFOLDER AND SOIL INTERACTION

2017 ◽  
Vol 2 (3) ◽  
pp. 19-23
Author(s):  
Михаил Канаев ◽  
Mikhail Kanaev ◽  
Олег Карпов ◽  
Oleg Karpov ◽  
Сергей Васильев ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Humus Horizon ◽  
Physical And Mechanical Properties ◽  
Theoretical Research ◽  
Design Stage ◽  
Mineral Fertilizers ◽  
Technological Parameters ◽  
Additional Energy ◽  
Gauge Link ◽  
Humus Layer

The purpose of research is to improve the dosing of mineral fertilizers sowing unit, depending on the physico-mechanical properties of the soil. In modern technologies of precision farming with differentiated application of mineral fertilizers, data from various sensors, results of analyzes of soil samples and aerial photography are mainly used, without taking into account factor such as the depth of the humus horizon, which largely determines the soil fertility. On the basis of the Samara State Agricultural Academy, studies are underway on the effect of the depth of the humus horizon on the fertility of the soil. Several machines have been developed for differentiating mineral fertilizers with spreader and cultivator. Currently, a system of differentiated application of mineral fertilizers is being developed for sowing agricultural crops and it is planned to produce a set of equipment for a standard seeder UCS-8 Vesta. A constructive scheme of the device for determining the traction resistance is presented, which is closely related to the depth of occurrence of the humus layer. The main working element of this device is a deformer in the form of a knife, with a dihedral grinding. The article presents theoretical studies of the effect of forces acting on a deformer. Based on the results of the theoretical justification of the technological process of the proposed scheme for determining the traction resistance, the load dependencies on the strain gauge link were derived depending on the drag resistance of the deformer, which is determined by its basic design and technological parameters and the physical and mechanical properties of the soil. The obtained dependences of the traction resistance of the working organs of the tillage implement will theoretically determine the additional energy costs from the introduction of the deformer in the design stage at the design stage of the machine and outline the directions for their optimization.

scholarly journals Theoretical Research of the Design and Technological Parameters of a Device for Lifting of Deep-Seated Table Root Crops

2019 ◽  
Vol 22 (3) ◽  
pp. 99-103
Author(s):  
Volodymyr Bulgakov ◽  
Semjons Ivanovs ◽  
Igor Safchenko ◽  
Andrii Boris ◽  
Petro Rychlivskyj
Keyword(s):  
Mathematical Model ◽  
Energy Consumption ◽  
Sandy Loam ◽  
Theoretical Method ◽  
High Energy ◽  
Theoretical Research ◽  
Minimal Energy ◽  
Technological Parameters ◽  
Root Crops ◽  
Theoretical Mechanics

Abstract Due to the high energy intensity of lifting of deep-seated table root crops, their growth develops mainly in light sandy-loam soils, in which it is possible to transfer a heap of root crops to the separating devices in order to facilitate the qualitative separation. Therefore, issue of lifting of deep-seated table root crops at minimal energy consumption and labour costs is an important scientific and practical task, which would allow expansion of cultivation of deep-seated table root vegetables to heavy soils. Research was conducted by means of a theoretical method utilizing elements of theoretical mechanics with subsequent processing of results by means of PC. Mathematical model and resulting energy cost dependences were constructed on the basis of the device parameters for soil loosening and lifting of deep-seated table root crops. Refined mathematical model of the process of lifting of deep-seated root crops made it possible to find out scientific and technical preconditions for the development of lifting devices with minimal energy consumption.

scholarly journals Theoretical researches of threshing and separation processes of bread mass by the threshing-separating device

2020 ◽  
pp. 60-66
Author(s):  
O.M. Hrytsaka
Keyword(s):  
Mathematical Model ◽  
Rational Design ◽  
Theoretical Research ◽  
Design Parameters ◽  
Technological Parameters ◽  
Separation Processes ◽  
Combine Harvester ◽  
Combine Harvesters ◽  
The Mathematical Model ◽  
Grain Losses

Annotation Purpose. Theoretical researches of increase of efficiency of working processes of threshing, separation of grain mass by combine harvesters by improvement and use of a multi-drum design of the threshing-separating device with rational design and technological parameters of work capable to provide necessary agrotechnical requirements. Methods. In theoretical researches the analysis of interaction of the threshing-separating device with grain mass with use of mathematical modeling of processes of threshing of grain, separation of a rough heap and their estimation is carried out. Results. The mathematical model of the mobile multi-drum thresher modernized as a result of change of settings that allowed to increase efficiency of its work is considered; the dependences of quality on the design parameters of the threshing-separating device during the implementation of technological processes of grain harvesting due to the reduction of the total level of injuries and grain losses are obtained. Conclusions. A mathematical model of improvement of the threshing process, separation of grain mass in the threshing gap of the threshing-separating device was developed, which allowed to obtain the dependences of the influence of structural and technological parameters on the level of threshing and separation. It is established that a significant reserve for improving the process of threshing, separation of grain mass is changes in the settings of threshing drums. Keywords: combine harvester, mathematical model, threshing-separating device, theoretical research, grain harvesting, threshing process.

JESSOP JS17Cr-4Ni

Alloy Digest ◽  
1982 ◽  
Vol 31 (7) ◽  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Food Processing ◽  
Precipitation Hardening ◽  
High Strength ◽  
Heat Treating ◽  
Steel Company ◽  
Lower Strength ◽  
Nickel Copper ◽  
Short Time

Abstract JESSOP JS17Cr-4Ni is a martensitic, precipitation-hardening chromium-nickel-copper stainless steel. It provides an excellent combination of high strength and hardness, short-time low-temperature precipitation hardening and good mechanical properties at temperatures up to 600 F (316 C). Its corrosion resistance is quite good but inferior to lower strength grades produced for corrosion-resistance applications. JS17Cr-4Ni is used widely for critical applications in the aerospace, chemical, food processing and other industries. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SS-412. Producer or source: Jessop Steel Company.

The effect of pressure on the compressibility of aluminum alloys

2020 ◽  
pp. 102-107
Keyword(s):  
Mechanical Properties ◽  
Mathematical Model ◽  
Liquid Metal ◽  
Control Systems ◽  
Physical And Mechanical Properties ◽  
Reliable Data ◽  
Output Process ◽  
Automated Control ◽  
Input And Output ◽  
Crystallization Under Pressure

To obtain reliable data on the properties of liquid metal and create automated control systems, the technological process of molding with crystallization under pressure is studied. A mathematical model of the input and output process parameters is developed. It is established that the compressibility of the melt can represent the main controlled parameter influencing on the physical-mechanical properties of the final products. The obtained castings using this technology are not inferior in their physical and mechanical properties to those produced by forging or stamping.

Mathematical model for combined extrusion of bar stock into cylindrical die by fl at working surface punch

2020 ◽  
pp. 309-312
Author(s):  
S.N. Larin S.N. ◽  
V.I. Tregubov ◽  
A.N. Isaeva
Keyword(s):  
Mathematical Model ◽  
Extrusion Force ◽  
Technological Parameters ◽  
Thin Walls ◽  
Working Surface ◽  
Industrial Implementation ◽  
Pressure Estimation

Combined extrusion processes can be in demand in the production of body products with jumper in the central part and thin walls. Often, their industrial implementation requires theoretical justifi cation of power regimes. Mathematical model of combined extrusion created on the basis of the upper estimates method is presented. The effect of technological parameters on extrusion force is established based on the obtained expressions for pressure estimation.

scholarly journals Influence of Gating System Parameters of Die-Cast Molds on Properties of Al-Si Castings

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3755
Author(s):  
Štefan Gašpár ◽  
Tomáš Coranič ◽  
Ján Majerník ◽  
Jozef Husár ◽  
Lucia Knapčíková ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Computer Modelling ◽  
Permanent Deformation ◽  
Surface Hardness ◽  
Technological Parameters ◽  
Inlet System ◽  
Die Cast ◽  
Key Factor ◽  
Fine Grained Structure ◽  
Design Solutions

The resulting quality of castings indicates the correlation of the design of the mold inlet system and the setting of technological parameters of casting. In this study, the influence of design solutions of the inlet system in a pressure mold on the properties of Al-Si castings was analyzed by computer modelling and subsequently verified experimentally. In the process of computer simulation, the design solutions of the inlet system, the mode of filling the mold depending on the formation of the casting and the homogeneity of the casting represented by the formation of shrinkages were assessed. In the experimental part, homogeneity was monitored by X-ray analysis by evaluating the integrity of the casting and the presence of pores. Mechanical properties such as permanent deformation and surface hardness of castings were determined experimentally, depending on the height of the inlet notch. The height of the inlet notch has been shown to be a key factor, significantly influencing the properties of the die-cast parts and influencing the speed and filling mode of the mold cavity. At the same time, a significant correlation between porosity and mechanical properties of castings is demonstrated. With the increasing share of porosity, the values of permanent deformation of castings increased. It is shown that the surface hardness of castings does not depend on the integrity of the castings but on the degree of subcooling of the melt in contact with the mold and the formation of a fine-grained structure in the peripheral zones of the casting.

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