scholarly journals STRESS - STRAIN STATE OF THE LOCAL AREA IN THE BUILDING ELEMENT WITH STRUCTURAL DEFECT

2021 ◽  
Vol 28 (1) ◽  
Author(s):  
Victor Kolokhov ◽  
◽  
Mykola Savytskyi ◽  
Artem Sopilniak ◽  
◽  
...  
Keyword(s):  
Structural Defect ◽  
Deformation Process ◽  
Strain State ◽  
Construction Material ◽  
Local Area ◽  
Structural Defects ◽  
Structural Element ◽  
Stress Strain ◽  
Building Element ◽  
Stress Strain State

Evaluation of the building element technical state relies on verification calculations using estimated construction material properties. Physical and mechanical properties are estimated predominately by using non-destructive test methods. The accuracy of these methods is affected by the level of stress-strain state of the structural element and present structural defects. The variability of the concrete properties over time under constant loads is a determining factor for the durability and reliability of the structural element. The influence of the physical and mechanical characteristics of a construction material on the deformation process of the local area of the structural element adjacent to the structural defect has been investigated. The research has been performed on structural models using software systems "LIRA SAPR" and "SOLIDWORKS". A structural model having dimensions of 100 x 100 x 400 mm was used for the study. Materials of concrete grades C12/15 through C25/30 with corresponding properties have been used. Load parameters for modeling of the deformation process varied from 0.1 to 0.5 of the ultimate loads. Performed calculations made it possible to obtain fields of stress, deformation and displacement under different model parameters and stress levels.

3D Simulation of Stress-Strain State of Plasma Arc Surfacing by CAD/CAE Software Sysweld

2014 ◽  
Vol 1029 ◽  
pp. 1-7
Author(s):  
Rayna Dimitrova ◽  
Alexander Nedelchev ◽  
Antonio Nikolov
Keyword(s):  
Deformation Process ◽  
Strain State ◽  
3D Simulation ◽  
Visual Environment ◽  
Plasma Arc ◽  
Technological Parameters ◽  
State Distribution ◽  
Stress Strain ◽  
Stress Strain State ◽  
Cae Simulation

The deformation process during the plasma arc surfacing is analyzed by CAD/CAE software SysWeld under Visual Environment using 3D simulation. The aim of simulation is visualization of a temperature field and a stress-strain state distribution as resul ts of surfacing under typical technological parameters of plasma arc processing which could be used for education. Key w ords : CAD/CAE simulation , plasma arc surfacing , stress-strain state

scholarly journals Plastic Folding of Bar Stocks of Round and Barrel-Shaped Sections

2022 ◽  
Author(s):  
O.S. Zhelezkov
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Cross Sections ◽  
Deformation Process ◽  
Strain State ◽  
Stress Strain ◽  
Plastic Bending ◽  
Bending Angle ◽  
Element Modeling ◽  
Stress Strain State

Abstract. Research has been carried out on the process of plastic folding of bar stocks with round and barrel-shaped cross-sections. The dependence of the movement of the movable tool on the bending angle has been established. The force parameters of the deformation process and the stress-strain state in the bending workpiece are determined based on the results of finite element modeling of plastic bending.

scholarly journals Evaluation of the quality of three-layer steel bimetallic strips obtained on a unit of continuous casting and deformation

2021 ◽  
Vol 64 (10) ◽  
pp. 755-760
Author(s):  
O. S. Lekhov ◽  
M. M. Shevelev
Keyword(s):  
Continuous Casting ◽  
Deformation Process ◽  
Strain State ◽  
Steel Strip ◽  
Stress Strain ◽  
Steel 09G2s ◽  
Cladding Layer ◽  
Stress Strain State ◽  
Cladding Layers

Today there is an urgency of creating high-performance continuous processes for the production of bimetals. The article describes the main tasks of improving the quality of the materials under consideration. Two stages of the technology for producing steel three-layer bimetallic strips on the unit of a combined continuous casting and deformation process are considered. The authors give recommendations on the conduct of the technological process in order to obtain high-quality bimetallic strips on such unit. The problem statement is presented. The material considers initial data for determining the temperature of the steel base strip and the stress-strain state of the metals of the cladding layers and the strip in deformation center of a three-layer bimetallic ingot. A model for calculating and a method for solving problems of thermal conductivity and elastoplasticity are shown. Regularities of the temperature change of the main steel strip are given during its passage through the molten metal of the cladding layer. Stress-strain state of the metals of the main strip and cladding layers in the deformation center was determined when three-layer bimetallic steel strips were obtained on the unit of combined continuous casting and deformation process. The authors describe the values of compression of the main steel strip and mutual displacement of the layers during compression of the bimetallic ingot by the strikers. Regularities of the distribution of axial and tangential stresses are shown along the contact line of the cladding layer with the striker. The evaluation of the process of obtaining bimetal steel 09G2S - steel 13KhFA - steel 09G2S was made on a pilot unit for continuous casting and deformation. Microstructure of the main strip and cladding layers of a three-layer bimetallic steel strip is shown when a combined continuous casting and deformation process is obtained in one unit.

scholarly journals The stress-strain state of the tank on soil foundation with local inhomogeneity

2019 ◽  
pp. 96-101 ◽  
Author(s):  
Alesya A. Gruchenkova ◽  
Aleksandr A. Tarasenko
Keyword(s):  
Strain State ◽  
Local Area ◽  
Tank Wall ◽  
Local Inhomogeneity ◽  
Technical Documentation ◽  
Stress Strain ◽  
Stress Strain State ◽  
Zone Of Influence ◽  
Soil Foundation

This article aims to numerically investigate the stress-strain state of the tank at the appearance a local area of inhomogeneity in the soil foundation. We have established the size of the zone of influence of the inhomogeneity area of the base on the work of the tank wall. Also, we have formulated proposals to adjust the requirements of the Russian regulatory and technical documentation.

scholarly journals Registration of the Emission of Submicron Particles of Rocks to Predict the Destruction of Underground Mine Workings at Rockburst-Hazardous Deposits

2019 ◽  
pp. 50-62
Author(s):  
S.D. Viktorov ◽  
A.A. Osokin ◽  
A.V. Shlyapin ◽  
I.N. Lapikov
Keyword(s):  
Rock Pressure ◽  
Strain State ◽  
Underground Mining ◽  
Submicron Particles ◽  
Structural Defects ◽  
Anthropogenic Activity ◽  
Stress Strain ◽  
Rock Formation ◽  
Stress Strain State ◽  
Rock Formations

The results of studies of the conditions for the formation of submicron particles from the surface of the rock formation under the influence of external factors are presented. The deformation and destruction of the mass of rock formations under the conditions of anthropogenic activity under the influence of rock pressure and blasting are characterized by the origin and development of structural defects at various scale levels. A method for recording the emission of submicron particles is proposed to carry out experimental work forstudies of the process of disintegration and the formation of free particles. The results of laboratory studies of the stress-strain state of rock formation samples with a through cylindrical cavity under uniaxial compression, made on the basis of a physical model for the formation of submicron particles from the surface of the samples under study, are presented. The sizes and nature of changes in stress concentration zones and fracture under quasi-static uniaxial loading of specimens are determined. The loading limits have been established to ensure the transfer of rock formation samples to the pre-fracture state. The obtained results are necessary for the development of a fundamentally new method and hardware-technical base for recording dynamic forms of manifestation of rock pressure and prediction of rockbursts in the conduct of underground mining. The results of experimental-industrial tests of the method for determining the stress-strain state of a specific section of a rock formation massif based on the phenomenon of submicron particle emission are presented.

scholarly journals Modelling of Temperature Field and Stress–Strain State of the Workpiece with Plasma Coatings during Surface Grinding

Machines ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 20 ◽  
Author(s):  
Anatoly Usov ◽  
Vladimir Tonkonogyi ◽  
Predrag Dašić ◽  
Olga Rybak
Keyword(s):  
Mathematical Model ◽  
Strain State ◽  
Structural Defects ◽  
Grinding Wheel ◽  
High Heat Flux ◽  
Grinding Process ◽  
Stress Strain ◽  
Stress Strain State ◽  
Input Parameters ◽  
Plasma Coatings

Plasma coatings play a key role in surface tailoring through providing important advantages for tools during their further application. However, grinding these coatings may cause different defects such as grinding burns and cracks, structural changes to the coating material, and the destruction of adhesive contacts between the coating layer and the substrate. The reason for that is the high heat flux generated in the process of abrasive material removal due to the high friction and stresses. In order to define the optimal conditions for grinding plasma coatings, the mathematical model of the temperature thermal field and the stress–strain state during the grinding process is developed. Based on the temperature, strength, and fracture criteria, this mathematical model makes it possible to define the functional relationship between the technological characteristics of the grinding process and the conditions that provide the required quality of surface processing. The role of the structural defects that are generated while coatings are being sprayed, as well as during coating adhesion, is also considered. An algorithm developed to present the results of the modelling process enables checking if the input parameters meet the condition of zero-defect grinding of a workpiece, and determining an expected surface roughness. Input parameters include the grinding wheel geometry, its abrasive properties, the wheel speed, longitudinal and transverse motion, grinding depth, and the use of the cutting fluid. Experimental testing of this study shows the way in which the regime of the grinding process and different grinding wheel parameters influence the physical and mechanical properties of the surface layer.

scholarly journals Stress-strain state analysis of the leading car body of DPKr-2 diesel train under action of design and operational loads

2019 ◽  
Vol 294 ◽  
pp. 03018 ◽  
Author(s):  
Sergei Kostritsa ◽  
Alexander Pshinko ◽  
Lyudmila Ursulyak ◽  
Andriy Kuzyshyn ◽  
Maxim Kramarenko ◽  
...  
Keyword(s):  
Strain State ◽  
Experimental Studies ◽  
The Body ◽  
Operational Mode ◽  
Structural Element ◽  
Stress Strain ◽  
Car Body ◽  
Regulatory Documents ◽  
Stress Strain State ◽  
Strength And Durability

Purpose.Provision of strength and durability of the main structural element of DPKr-2 diesel train -the leading car body. Methodology. A spatial solid-state 3-D model of the body is built and durability calculations are carried out concerning action of loads stipulated by regulatory documents operating in Ukraine. In particular, the following main estimated modes are considered: mode 1 – a notional safety mode which takes into account the possibility of considerable longitudinal forces arising during shunting movements, transportation and accidental collision; mode 2 – an operational mode which takes into account forces acting on a train during acceleration to constructional speed, coasting or braking from this speed while passing a curve. Results. Based on the results of theoretical and experimental studies a conclusion has been made that the leading car body construction of DPKr-2 diesel train meets the requirements of regulatory documents regarding strength and durability. Practical relevance. A complex of calculation and experimental work concerning assessment of stress-strain state of the leading car body of DPKr-2 diesel train under action of design and operational loads allowed the creation of construction which meets not only operational requirements but also strength and durability ones.

scholarly journals SIMULATION OF THE STRESS-STRAIN STATE FOR LONG-LENGTH FLEXIBLE PIPES

2018 ◽  
Vol 15 (30) ◽  
pp. 670-677
Author(s):  
S. V. YAKUBOVSKAYA ◽  
N. I. KRASOVSKAYA ◽  
N. Y. SILNITSKAIA
Keyword(s):  
Plastic Deformation ◽  
Strain State ◽  
Block Diagram ◽  
Construction Material ◽  
Secant Modulus ◽  
Flexible Pipe ◽  
Stress Strain ◽  
Nonlinear Properties ◽  
Stress Strain State ◽  
Flexible Pipes

An algorithm for calculating the stress-strain state for a system of long-length flexible pipes on a drum is proposed. The material which the pipe is made of operates in the area of plastic deformation due to the relative small drum diameter. To take into account the nonlinear properties of the construction material, the concept of a variable (secant) module is used. The algorithm for calculating the stress-strain state of a flexible reinforced long-length pipe was compiled on the basis of the iteration method in terms of the magnitude of the change in the secant modulus. A block diagram is given. Numerical results of the stress analysis of a flexible pipe made of reinforced polyethylene are presented in the form of graphs and tables.

scholarly journals Investigation of the Stress-Strain State of Seamless Pipe in the Initial State

2014 ◽  
Vol 61 (4) ◽  
pp. 595-607 ◽  
Author(s):  
Jerzy Malachowski ◽  
Volodymyr Hutsaylyuk ◽  
Petr Yukhumets ◽  
Roman Dmitryenko ◽  
Grigorii Beliaiev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Deformation Process ◽  
Strain State ◽  
Stable State ◽  
Seamless Pipe ◽  
Initial State ◽  
Stress Strain ◽  
The Real ◽  
Stress Strain State ◽  
Experimental Researches

Abstract Mechanical properties of the pipeline samples that had been cut in annular and axial directions were investigated. The methodology of modeling and calculation of the real stress-strain state was described. The stable state during in the deformation process was defined. The results of the experimental researches were used as a test variant during examination of pipe strength.

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