scholarly journals Study of the Influence of the Main Parameters of “Rolling-ECAP” Process on the Stress-Strain State and the Microstructure Evolution Using Computer Simulation

2019 ◽  
Vol 37 ◽  
pp. 459-466
Author(s):  
Abdrakhman Naizabekov ◽  
Sergey Lezhnev ◽  
Evgeniy Panin
Keyword(s):  
Computer Simulation ◽  
Microstructure Evolution ◽  
Strain State ◽  
Stress Strain ◽  
Stress Strain State ◽  
Ecap Process

scholarly journals Numerical and experimental investigations of steel-concrete beams with thin-walled section

Vestnik MGSU ◽  
2019 ◽  
pp. 22-32
Author(s):  
Farit S. Zamaliev
Keyword(s):  
Experimental Data ◽  
Computer Simulation ◽  
Strain State ◽  
Concrete Beams ◽  
Concrete Structures ◽  
Stress Strain ◽  
Stress Strain State ◽  
Numerical Studies ◽  
Field Samples ◽  
Thin Walled

Introduction. Conducted is to the evaluation of the stress-strain state of the steel-concrete beams with thin-walled section. In recent times, steel-reinforced concrete structures have become widely used in civilian buildings (beams, slabs, columns). Thin-walled section have not found wide application in steel concrete structures, unlike steel structures. Presents the results of numerical studies of beams consisting of concrete, anchors and steel beams. Two investigating of the location of anchors are given. Numerical investigations are presented of steel-concrete beams with thin-walled section based on numerical studies. Testing procedure and test result are given. Results of calculations, comparison of numerical and experimental studies are presented. Materials and methods. For full-scale experiments, steel I-beams with filling of side cavities with concrete were adopted, screws are used as anchor ties, with varied both the lengths and their location (vertically and obliquely). As steel curved C-shaped steel profiles were used steel profiles from the range of the company “Steel Faces”. ANSYS software package was used for computer modeling. A total of 16 steel concrete beams were considered, for which the results of strength and stiffness evaluation were obtained in ANSYS. Results. The data of the stress-strain state of beams on the basis of computer simulation are obtained. The results are used for the production of field samples. Data of computer simulation are compared with the indicators of field experiments. Conclusions. The stress-strain state of steel-concrete structures was studied on the basis of numerical and experimental data. The proposed calculation method gives good convergence with the experimental data. Anchor connections made from self-tapping screws can be used in studies for modeling in steel-concrete beams structures and other anchor devices, ensuring the joint operation of concrete and steel profiles in structures.

Modeling of “Stretching-Over” Static-Dynamic Process

2021 ◽  
Vol 1031 ◽  
pp. 216-221
Author(s):  
Irina A. Belyaeva ◽  
Vladimir Glushchenkov ◽  
A.Y. Pyl'tsin
Keyword(s):  
Magnetic Field ◽  
Computer Simulation ◽  
Dynamic Process ◽  
Strain State ◽  
Distribution Patterns ◽  
Pulsed Magnetic Field ◽  
Magnetic Pulse ◽  
Stress Strain ◽  
Stress Strain State ◽  
Stretching Process

The article presents the technological scheme of the “stretching-over” hybrid technology, when the workpiece is simultaneously affected by two sources of loading: static and dynamic. It is proposed to use a pulsed magnetic field as a dynamic load. In this case, the tightening punch is equipped with an inductor connected to a magnetic-pulse unit. As a result of computer simulation, the distribution patterns of the stress-strain state in a tight-fitting workpiece were obtained both in the case of a conventional tight-fitting and with the proposed hybrid one. It was found that exposure to a pulsed magnetic field changes the stress-strain state, making it possible to intensify the stretching process.

scholarly journals Investigation of the Tubular and Cylindrical Billets Stamping by Rolling Process with the Use of Computer Simulation

2021 ◽  
Author(s):  
Viktor Matvijchuk ◽  
Andrii Shtuts ◽  
Mykola Kolisnyk ◽  
Ihor Kupchuk ◽  
Iryna Derevenko
Keyword(s):  
Computer Simulation ◽  
Computer Modeling ◽  
Strain State ◽  
Cold Deformation ◽  
Rolling Process ◽  
Stress Strain ◽  
Workpiece Material ◽  
Deformation Curves ◽  
Stress Strain State ◽  
Sound Management

Forming of blanks during stamping by rolling (RS) is possible according to technological schemes of deposition, landing, direct and reverse extrusion, distribution and compression, etc. Controlling the relative position and shape of the deformed tool allows you to control the direction of flow of the workpiece material and the nature of its formation, as well as the stress-strain state of the material. The complexity and versatility of RS processes necessitate computer modeling for sound management of basic technological parameters.Physical experimental as well as computer modeling of the RS process in the DEFORM-3D software package was performed in the work.According to the results of computer simulation, the distribution of deformation components, stresses and temperatures in the deformed workpiece area was obtained, and using the Cockroft-Latham criterion, the destruction of metals during cold deformation was also predicted.Physical modeling of the SR process on lead blanks confirmed the nature of their deformation, obtained by computer simulation. And the analysis of the stress-strain state of the material based on the results of measurements of the deformed grid confirmed the validity of the appointment of boundary conditions in computer simulation.This approach is suitable for modeling by the method of SR of any metal models, for which it is necessary to know their mechanical characteristics, including boundary deformation curves.

Computer Simulation and Study of the New Forging Technology of Billets in a Step-Wedge Dies

2020 ◽  
Vol 299 ◽  
pp. 699-704
Author(s):  
Andrey O. Tolkushkin ◽  
Sergey N. Lezhnev ◽  
A.B. Naizabekov
Keyword(s):  
Computer Simulation ◽  
Comparative Analysis ◽  
Strain State ◽  
Drawing Process ◽  
Stress Strain ◽  
Stress Strain State ◽  
Specific Configuration

The paper presents the results of a computer simulation of the drawing process in the step-wedge dies of two configurations: with wedge-shaped protrusions in the first and second sections of the top and bottom dies, and with a wedge-shaped protrusion in the first and second sections of the top die and wedge-shaped cavity in the first and second sections of the bottom die. A comparative analysis of the stress-strain state and energy-power parameters is carried out. Based on the analysis conclusions about the feasibility of choosing a specific configuration of step-wedge dies depending on the set aim were made.

scholarly journals Computer simulation of deformation and fracture conditions during the detail rolling with a flange with inclined rolls

2021 ◽  
Vol 41 (2) ◽  
Author(s):  
Sergey A. Ignatiev ◽  
Pavel V. Kononov ◽  
Dmitry S. Levashov ◽  
Eduard Kh. Muratbakeev ◽  
Konstantin O. Glazunov
Keyword(s):  
Computer Simulation ◽  
Rheological Properties ◽  
Computer Model ◽  
Software Package ◽  
Strain State ◽  
Fracture Criterion ◽  
Stress Strain ◽  
Stress Strain State ◽  
Deformation And Fracture ◽  
Deform 3D

An adequate computer model of the process of rolling flange details with inclined rolls has been built in the software package DEFORM-3D. The analysis of the stress-strain state of a detail with a flange was performed. The rheological properties of the alloy L63 (62-65% Cu, 34.5-38% Zn) were experimentally studied. Value limits of the Cockcroft-Latham fracture criterion for the alloy L63 are determined.

scholarly journals Determining thermal stresses in asphalt concrete by the method of computer simulation

2021 ◽  
pp. 105-111
Author(s):  
Volodymyr Maliar
Keyword(s):  
Finite Element Analysis ◽  
Computer Simulation ◽  
Finite Element ◽  
Asphalt Concrete ◽  
Strain State ◽  
Thermal Stresses ◽  
Three Dimensional ◽  
Stress Strain ◽  
Element Analysis ◽  
Stress Strain State

The main destructions of asphalt concrete pavement are rut, transverse cracking, fatigue failures, peeling, etc. When the pavement cools, lowtemperature damages can occur for various reasons. The sources of damages that cause such failures are not well studied, so this problem is relevant. Goal. The aim of this work was to determine the stress-strain state inside the volume of asphalt con-crete during cooling on the basis of a two composite three-dimensional model using the method of computer simulation in response to the changing structured bitumen properties. Methodology. The method of finite element analysis of the stress-strain state of the composite material was used. The material is represented by a three-dimensional (3D) model pro-posed by prof. B.S. Radovsky. Results. The finite element analysis method was used to calculate the average thermal stresses in asphalt concrete during cooling in accordance with increase of viscosity of bitumen section, which is located in asphalt concrete in a structured state. This consideration is realized on the basis of changes in a number of bitumen properties in the contact zone, in particular, the changes in the glass transition temperature. It is shown that the thermal stresses that occur during cooling by limiting the movement of asphalt concrete in the construction reach the strength values at negative temperatures, which can be used to estimate the temperature of crack formation in asphalt concrete under the condi-tion of its action in pavement (Tcr). The values of these stresses depend on the cooling rate, the bitumen content, its viscosity and structure. Originality. For the first time, it was found numerically that in the sample of asphalt concrete, which is free from restriction of movements, there are internal thermal stresses during cooling due to the difference of bitumen thermal expansion coefficients and stone materials. These stresses are up to 87 percent of the average thermal stresses that occur in the compressed sample. Practical value. The possibility of rapid estimation of thermal stresses with the possibility of predicting low-temperature cracks in asphalt concrete is shown.

scholarly journals Study of stress-strain state during cross-wedge rolling with one tool

2019 ◽  
Vol 64 (2) ◽  
pp. 175-181
Author(s):  
G. V. Kozhevnikova
Keyword(s):  
Computer Simulation ◽  
Comparative Studies ◽  
Deformation Zone ◽  
Strain State ◽  
Average Stress ◽  
Cross Wedge Rolling ◽  
Axial Region ◽  
Stress Strain ◽  
Cross Rolling ◽  
Stress Strain State

The peculiarity of cross-wedge rolling with one tool is the workpiece deformation with one tool and the fact that the workpiece is not supported with the tool from the opposite side. On both sides of the tool outside the contact with the workpiece, the workpiece is fixed with pairs of upper and lower tools, by means of which the axis of the workpiece is held in a constant position. Such conditions of rolling qualitatively change the deformation zone and, as a result, the stress-strain state.The change in the stress-strain state was qualitatively estimated by comparing the fields of slip lines in the traditional two-tools cross rolling and one-tool cross rolling. One-tool cross rolling increases the normal and average stress at the contact by 7.8–14.5 %, changes the average stress of the specimen from tensile to compressive one in the axial region. This circumstance significantly increases the resource of plasticity and allows rolling metals with limited plasticity without opening the axial cavity. Comparative studies of the stress-strain state from the traditional two-tools cross-wedge rolling and one-tool cross-wedge rolling in the axial region of the workpiece have been carried out by computer simulation.

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