scholarly journals Consideration of the loading of the traffic lines in the design of automobile roads

2021 ◽  
Vol 274 ◽  
pp. 02009
Author(s):  
Denis Nikolenko ◽  
Maxim Nikolenko ◽  
Anastasiya Filippova
Keyword(s):  
Traffic Flow ◽  
Strain State ◽  
Dynamic Deformation ◽  
Uneven Distribution ◽  
Stress Strain ◽  
Stress Strain State ◽  
Freight Traffic ◽  
Design Solutions ◽  
The Difference ◽  
Strength And Durability

The article focuses on the importance of the strength and durability of highways due to the projected increase in freight traffic. It also describes the consequences of uneven distribution of loads in traffic lanes, depending on the prevailing traffic in each lane. The studies, that were carried out earlier by various scientists, were taken into account, thankfully to which results were obtained on the composition of the traffic flow, the difference in the loading of road pavements, as well as the stress-strain state of road structures. As a result, a model that reflects the dependence of the influence of the speed of movement of vehicles on the dynamic deformation of structures, was developed. Consequently, a number of design solutions were established to ensure the required strength of all structures.

scholarly journals Mathematical model of the stress-strain state of a rod with an inhomogeneous layered structure

2021 ◽  
Vol 82 (4) ◽  
pp. 14-22
Author(s):  
S. M. Akhmetov ◽  
◽  
M. T. Userbayev ◽  
Zh. U. Iklasova ◽  
A. B. Bolatova ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Layered Structure ◽  
Strain State ◽  
Stress Strain ◽  
Stress Strain State ◽  
Current State ◽  
Tension And Compression ◽  
The Difference ◽  
State Of Research ◽  
Wooden Structures

The stress-strain state (SSS) of a rod with an inhomogeneous layered structure is considered. On the basis of a brief review and analysis of the current state of research of rod systems, the relevance of the study of the SSS of layered-heterogeneous wooden structures is substantiated, taking into account the presence of different resistance of layers to tension and compression. On this basis, the authors solve the problem of determining the SSS of layered-heterogeneous wooden rods in creep conditions, where factors such as humidity and temperature, as well as the difference in the resistance of wood layers to stretching and compression are taken into account. When solving the problem, the mechanical-sorption creep of wood is also taken into account.

scholarly journals Influence of house bearing construction rigidi-ty of precast reinforced concrete on stress-strain state Continuous Flight Auger (CFA) piles foundations

2020 ◽  
pp. 48-57
Author(s):  
Viktor Nosenko ◽  
Oleg Krivenko
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Residential Buildings ◽  
Precast Concrete ◽  
Relative Deformation ◽  
Construction Time ◽  
Stress Strain ◽  
Stress Strain State ◽  
Basement Floor ◽  
The Difference

At present, the tendency to build multi-storey residential buildings has become widespread in Ukraine. This is due to a number of reasons: significant increase in land prices in cities, dense urban development and the availability of appropriate equipment for the construction of such structures. One of the most common materials for multi-storey buildings is monolithic reinforced concrete. The main advantage of monolithic structures is the possibility of free spatial planning and the possibility of uniform redistribution of forces in the elements of the frame - the house works as one rigid entire structure. On the other hand, such structures require a long construction time and appropriate highly qualified control of monolithic works. Therefore, as an alternative, prefabricated reinforced concrete structures are used to accelerate the pace of construction. In this work, the influence of the rigidity of a precast reinforced concrete house on the stress-strain state of CFA piles foundation is investigated. The stress-strain state of a precast reinforced concrete building with two basement options is analyzed: precast and monolithic.                                                 The numerical modeling of the interaction of the system elements is used as a research method: soil base - foundation - aboveground structure. It was found that the replacement in a prefabricated house only one basement floor of precast concrete on a monolithic one affects the redistribution of forces, so the self-supporting wall is loaded 2.6 times, and the busiest wall, which rests on both sides of the floor slab, is unloaded to 2.1 times.  It was found that in the case of a basement made of precast reinforced concrete with a precast basement the difference efforts in pile heads (under the load-bearing walls) can differ 1.98 times, and in the case of a monolithic one 1.17 times. So it is mean, the monolithic foundation redistributed of efforts between the piles is more uniform. It is established that the monolithic reinforced concrete basement, in comparison with the prefabricated one, reduces the uneven settlement of the foundation by 2.4 times. When designing large-panel houses, it is advisable to provide a basement floor monolithic - this will allow to load the fundamental constructions more evenly, which in its reduction reduces the relative deformation of buildings and reduces their cost.

scholarly journals INVESTIGATION OF STRESS-STRAIN STATE OF “RESTORATION & TOOTH” SYSTEM IN WEDGE-SHAPED DEFECTS BY COMPUTED MODELING METHOD

2021 ◽  
Vol 74 (9) ◽  
pp. 2112-2117
Author(s):  
Natalia N. Brailko ◽  
Iryna M. Tkachenko ◽  
Victor V. Kovalenko ◽  
Anna V. Lemeshko ◽  
Alexey G. Fenko ◽  
...  
Keyword(s):  
Tangential Stress ◽  
Strain State ◽  
Adhesive Layer ◽  
Biomechanical Analysis ◽  
Stress And Strain ◽  
Restorative Material ◽  
Stress Strain ◽  
Stress Strain State ◽  
Small Height ◽  
The Difference

The aim of this research is to study the influence of size and location of wedge-shaped defects of teeth on stress and strain state of restorative material on the basis of biomechanical analysis. Materials and methods: Biomechanical analysis of the stress-strain state was performed on a jaw bone fragment with canine and premolar inclusion. Results: Tangential stress increase both in the adhesive layer and in restorative material with depth and width (medial-distal size) of restored wedge-shaped defects of teeth,. The most unfavorable loading on a tooth is a joint action of vertical and horizontal loading in lingual- vestibular or vestibular-lingual direction, depending on localization of the restored wedge-shaped defects of teeth. The formation of retention grooves in wedge-shaped defects of teeth reduces the value of the maximum tangential stress in the adhesive layer of restorative material to 25% and extends the longevity of restorations. Conclusions: The difference in maximal values of tangential stress increases in adhesive layer of restorative material with or without retention grooves with increasing depth of defect. Thus, it is advisable to form retention grooves in cases of wedge-shaped teeth defects that exceed 1.5 mm. In case of restoration of subgingival wedge-shaped defects of teeth of small height it is recommended to create one retention groove on the gingival or incisal planes of a carious cavity due to significant inconveniences, and sometimes impossibility of formation of traditionally located retention grooves.

scholarly journals COMPARATIVE ANALYSIS OF STRESS DISTRIBUTION IN ELEMENTS OF DIFFERENT DESIGN OF HINGE JOINT OF SPHERICAL MECHANISM

2021 ◽  
pp. 59-61
Author(s):  
A. V. Popov ◽  
I. V. Notov ◽  
A. A. Rozhnov
Keyword(s):  
Comparative Analysis ◽  
Stress Distribution ◽  
Strain State ◽  
Stress Strain ◽  
Hinge Joint ◽  
Stress Strain State ◽  
Design Solutions ◽  
Spherical Mechanism

Results of simulation of stress-strain state of various design solutions of hinge of spherical converting mechanism for stepless drives are considered. Comparisons of hinge loading are given when using an intermediate bushing made of various materials and without it. Recommendations for designing such an element taking into account the peculiarities of the work are justified.

scholarly journals RESEARCH AND EXPERIMENTAL STUDIES OF STRESS-STRAIN STATE OF DISCRETE-CONTINUAL HARDENED MACHINE PARTS

2021 ◽  
pp. 5-21
Author(s):  
Oleg Veretelnik ◽  
Mykola M. Tkachuk ◽  
Serhii Kravchenko ◽  
Mariia Saverska ◽  
Serhii Kutsenko ◽  
...  
Keyword(s):  
Strain State ◽  
Experimental Studies ◽  
Technological Parameters ◽  
Stress Strain ◽  
Stress Strain State ◽  
Hardening Process ◽  
Contact Loads ◽  
Machine Parts ◽  
Keywords Stress ◽  
Strength And Durability

Research and experimental studies of stress-strain state of discrete-continual hardened machine parts are presented in this work. This hardening method is distinguished by incorporation of numerous hard spots into the surface layer of one of the bodies. Meanwhile the other part is covered by a continuous corundum layer. Correspondingly, a network of microchannels for lubricant is formed between the bodies. Furthermore the contact loads are intensified in the vicinity of the harder material in the discrete zones. As a result the strength and durability of the loaded parts is increased. The technological parameters of the hardening process have great impact on the resulting characteristics. In particular, this concern the shape of the discrete hardening zones and the material properties of the corundum layer. These factors were varied in stress-strain analyses of the contacting bodies. The dependence of the stress-strain state characteristics on the varied parameters was established. The justified recommendations regarding the technological parameters of the discrete-continual hardening have been developed. Keywords: stress-strain state,  discrete-continual hardening,  contact interaction, finite element method, contact pressure, machine parts

Evaluation of the Effect of the Difference between the Real Attachment Unit and the Sealing in the Study of the Stress-Strain State of the Solar Panel of a Small Spacecraft as a Result of a Temperature Shock

2022 ◽  
Vol 904 ◽  
pp. 27-33
Author(s):  
A.V. Sedelnikov ◽  
V.V. Serdakova
Keyword(s):  
Strain State ◽  
Scientific Paper ◽  
Longitudinal Force ◽  
Solar Panel ◽  
Stress Strain ◽  
Temperature Shock ◽  
Small Spacecraft ◽  
Stress Strain State ◽  
Solar Radiation Flux ◽  
The Difference

The author of this scientific paper studies the stress-strain state of the solar panel of a small spacecraft after a temperature shock. The temperature shock is caused by the entry or exit of a small spacecraft into or out the Earth's shadow. In this work is considered a one-dimensional model of thermal conductivity. It is assumed that the solar radiation flux falls properly on the solar panel. Violation of normality due to deformations is neglected. A special feature of this work is to take into account the actual fixing of the solar panel. The boundary conditions in the form of a seal are preserved. However, the mobility of the smallest spacecraft is taken into account as a result of the occurrence of a longitudinal force in the solar panel during a temperature shock. The results are compared with the simulation data without taking into account the mobility of the small spacecraft. The results of this work can be used in the design of small spacecraft for technological purposes to meet the requirements for microaccelerations.

scholarly journals The numerical parametric study of the stress-strain state of I-beams having versatile corrugated webs

Vestnik MGSU ◽  
2021 ◽  
pp. 676-687
Author(s):  
Sergey G. Saiyan ◽  
Alexander G. Paushkin
Keyword(s):  
Numerical Model ◽  
Inclination Angle ◽  
Parametric Study ◽  
Software Package ◽  
Strain State ◽  
Stress Strain ◽  
Equivalent Stresses ◽  
Stress Strain State ◽  
Design Solutions ◽  
Numerical Parametric Study

Introduction. The numerical parametric study of the stress-strain state of I-beams, having versatile corrugated walls, was carried out in the ANSYS Mechanical APDL software package. Numerical results are obtained for displacements, equivalent stresses and stability coefficients depending on the change in the inclination angle of web corrugations for trapezoidal, wavy and triangular profiles. The obtained results can help to design and substantiate the design solutions applicable to bending elements. Materials and methods. The parametric study involved a series of numerical experiments conducted using the finite element method in the ANSYS Mechanical APDL software package. APDL parametric language was used to develop the software that was built into the software package. It allowed to perform a parametric reconstruction of the numerical model depending on varied parameters of the corrugated wall, and the reconstruction was followed by the numerical solution and post-processing of the calculation results. The calculations were made with the help of the model whose overall dimensions and material were identical to those of a standard I-beam having a solid wall exposed to a uniformly distributed transverse load. Results. The parametric study enabled the co-authors to identify the main features of the stress-strain state of the beams that had different types of corrugated walls. A parametric numerical model was compiled to determine maximum displacements, equivalent stresses and stability coefficients for various types of corrugated walls and various parameters of the corrugation angle. Isofields of equivalent stresses and buckling modes are provided for characteristic parameters and types of corrugations. The reliability of the obtained results was confirmed by the verification of the numerical model using the method of the strength of materials and corrugation inclination angle α = 0, which was the initial point of simulation for all types of corrugations. Conclusions. The results, obtained in the course of parametric studies, have identified the main features of the stress-strain state of beams having corrugated walls; they allow to substantiate their effectiveness as design solutions applied to bending elements.

scholarly journals DYNAMIC STRENGTH CONDITION OF CONCRETE UNDER PLANE STRESS STATE

2019 ◽  
Vol 21 (4) ◽  
pp. 138-145
Author(s):  
Z. R. Galyautdinov
Keyword(s):  
Reinforced Concrete ◽  
Stress State ◽  
Plane Stress ◽  
Strain State ◽  
Dynamic Deformation ◽  
Dynamic Strength ◽  
Strength Condition ◽  
Stress Strain ◽  
Stress Strain State ◽  
Wide Range

Modern calculation models must take into account the dynamic deformation of reinforced concrete. Currently, the main regularities of nonlinear dynamic deformation of reinforced concrete under uniaxial stress state are theoretically analyzed in detail along with a wide range of experimental studies. Properties of concrete under plane stress -strain state and dynamic loading are examined to a lesser extent. This paper proposes the dynamic strength condition for the concrete strength which allows for changing the strain -hardening coefficient of concrete depending on the type of stress -strain state, the ratio of the primary stresses and the deformation rate.

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.

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