scholarly journals Comparison of the stress and strain intensity factors for the corner area of the structure boundary

2018 ◽  
Vol 193 ◽  
pp. 03029
Author(s):  
Lyudmila Frishter
Keyword(s):  
Strain State ◽  
Engineering Practice ◽  
Stress And Strain ◽  
Strain Intensity ◽  
Intensity Factors ◽  
Stress Strain ◽  
Elasticity Theory Problem ◽  
Limit Values ◽  
Stress Strain State ◽  
Irregular Point

The stress-strain state of structures in areas with corner cut-outs and cuts of boundaries features the occurrence of areas of stress concentration and requires assessment of strength and reliability of facilities, which is a relevant task in engineering practice. Theoretical analysis of stress-strain state (SSS) of corner cut-outs zones of the area boundary is reduced to the study of singular solutions of the elasticity theory problem with exponential features. At that, the concept of stress or strain concentration in an irregular point of the area boundary is meaningless. This paper considers the stress-strain state in the vicinity of the top of the corner cut-out of the flat area boundary, which is recorded using the intensity factors as limit values of stresses and strains. We give two approaches for obtaining the limit values for stress and strain in the vicinity of an irregular point of the plane area boundary using the stress intensity factors and the strain intensity factors. The stress-strain state in the corner cut-outs zone of structures and buildings boundary recorded in the form of limit values of stresses and strains may further be used to determine and record the influence of changing the factors of intensity of stresses and strains on SSS of structures, which is a separate task of solid mechanics. The difference in the expressions of stresses and displacements obtained for limit values of stresses and strains determines practical significance of the work when carrying out experiments and at determination of critical values of stresses and strains.

Stress and Strain Intensity Factors of the Corner Area of the Structure Boundary

2018 ◽  
Vol 931 ◽  
pp. 30-35
Author(s):  
Lyudmila U. Frishter
Keyword(s):  
Strain State ◽  
Practical Significance ◽  
Engineering Practice ◽  
Stress And Strain ◽  
Building Structures ◽  
Strain Intensity ◽  
Intensity Factors ◽  
Plane Region ◽  
The Difference ◽  
Irregular Point

The Stress and strain state of building structures in zones with bird's mouths and cuts of the boundary is characterized by stress concentration zones emergence and requires an evaluation of strength and reliability of objects, which is the engineering practice actual task. Theoretical analysis of stress and strain state of bird's mouth areas of the region boundary is confined to the study of singular solutions of the elasticity problem with power singularities. In this case, the concept of stress or strain concentration at an irregular point of the region boundary becomes meaningless. In the present article, stress and strain state is considered in the neighborhood of the bird's mouth vertex of the boundary of a plane region, which is written with the help of the intensity factors. Two approaches are given to obtaining the expressions for displacements, stresses in the neighborhoods of an irregular point of the boundary of a plane region by means of stress intensity factors and strain intensity factors. The difference in the expressions for stresses and displacements obtained for the limiting values of stresses and strains determines the practical significance of the work during the experiments and the determination of the critical values of stresses and strains.

Stress and Strain Analysis of Three-Layer Composites with Interlayer Slip under Hygrothermal Loads

2006 ◽  
Vol 113 ◽  
pp. 565-570
Author(s):  
D. Zabulionis
Keyword(s):  
Composite Material ◽  
Exact Solutions ◽  
Strain State ◽  
Strain Analysis ◽  
Stress And Strain ◽  
Function Form ◽  
Stress Strain ◽  
Stress Strain State ◽  
Layer Composite ◽  
Interlayer Slip

This article deals with the stress and strain state of a three–layer composite material with interlayer slip subjected to hygrothermal loading. The exact solutions in an explicit function form that allows one to determine the stress-strain state and deflection of three–layer composite subjected to hygrothermal loading and by taking this into consideration the interlayer slip is proposed.

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 Study of the Stress-Strain State of the Process of Drawing Wire from an Alloy of Palladium with Nickel

2020 ◽  
Vol 992 ◽  
pp. 504-510
Author(s):  
S. Sidelnikov ◽  
V. Lopatin ◽  
M. Dobrovenko ◽  
E. Lopatina ◽  
R. Sokolov
Keyword(s):  
Strain State ◽  
Current Mode ◽  
Wire Drawing ◽  
Stress Strain ◽  
Limit Values ◽  
Stress Strain State ◽  
Limit Value ◽  
Drawing Die ◽  
Metal Deformation ◽  
3D Software

This article present the results of studies of the process of wire drawing from the PdNi-5 alloy, performed using computer simulation in the DEFORM 3D software package. В качестве материала для исследований использовали сплав с содержанием 95% палладия и 5% никеля. An alloy with a content of 95% palladium and 5% nickel was a material for research. The patterns of changes in the stress-strain state for the current processing mode determined, and a more rational drawing mode with a redistribution of drawing coefficients along transitions proposed. For the proposed regime, using the created model, the values of drawing stresses, drawing forces and Cockcroft-Latham criterion determined. It was found that the stress distribution in the deformation zone corresponds to the generally accepted laws of their change, and their maximum values are realized in the metal located in the calibrating zone of the drawing die. In addition was revealed that the stresses in the current mode have limit values at the second and fourth passes. The redistribution of deformation indicators in the proposed mode allowed reduce the magnitude of these stresses and, thereby, reduce the likelihood of wire breaks. The maximum value of the Cockcroft-Latham criterion is achieved in the last transitions, but at the same time, destruction will not occur, since they do not exceed the limit value. The drawing force also decreases with the implementation of the proposed mode and does not exceed the permissible values regulated by the technical characteristics of the equipment. Since it is the proposed mode of wire drawing, it is characterized by a decrease in energy power indicators and the likelihood of wire breakage in the process of metal deformation it can be recommend it for implementation in existing production.

scholarly journals Performance comparison of various types of embankment dams in relation to the conditions of the Mullalakh HPP

Vestnik MGSU ◽  
2021 ◽  
pp. 202-219
Author(s):  
Aleksei A. Podvysotckii ◽  
Mikhail P. Sainov ◽  
Andrey Yu. Kirichenko
Keyword(s):  
Stress State ◽  
Strain State ◽  
Hydraulic Engineering ◽  
Engineering Practice ◽  
Seismic Loads ◽  
Stress Strain ◽  
Embankment Dams ◽  
Stress Strain State ◽  
Concrete Face ◽  
High Seismicity

Introduction. Several types of embankment dams are used in the hydraulic engineering practice. However, the choice of a dam is individual for each hydraulic engineering project, as it takes account of specific features and natural conditions. This paper compares two types of rockfill dams (the one having a concrete face and the other having an asphalt-concrete diaphragm) in relation to the Mullalakh HPP on the Pskem River in the Republic of Uzbekistan. The dam height is 85 m. The comparison was performed from the standpoint of the dam performance in case of exposure to static forces and high seismicity. Materials and methods. The analysis of (1) the stress-strain state (SSS), (2) the stability of slopes exposed to regular and irregular load combinations was conducted for two types of dams. All calculations were performed in the two-dimensional domain. The analysis of the stress-strain state took account of the non-linear behavior of the soil ground and the contact interaction between structural elements. Seismic loads, included into the scope of irregular loads, were identified using the response spectrum method applied to particular periods and self-oscillation modes. Slope stability was analyzed with regard for the stress state of soils identified in the course of SSS calculations. Results. Each type of embankment dams has its specific features. The asphalt diaphragm dam is worse at perceiving high seismic loads. Its SSS during an earthquake features strength loss and emergence of soil discontinuity zones. The disadvantage of a concrete face dam is the insufficient safety of its anti-seepage element. Supplementary measures are needed to ensure the appropriate stress state of the face. Another finding is that the slopes of both types of dam do not demonstrate a sufficient stability factor, if the slope ratio equals to 1.5 during a 9-point earthquake. Conclusions. In high seismicity regions, a concrete faced dam demonstrates better performance than the asphalt diaphragm dam if both are exposed to static and seismic forces.

scholarly journals Experimental study of wind impact on multilevel industrial scaffolding

2020 ◽  
Vol 157 ◽  
pp. 06009
Author(s):  
Lyudmila Frishter ◽  
Maxim Lukin
Keyword(s):  
Strain State ◽  
Experimental Approach ◽  
Domain Boundary ◽  
Local Stress ◽  
Plane Domain ◽  
Stress Strain ◽  
Stress Strain State ◽  
Polymer Models ◽  
The Subject ◽  
Irregular Point

In the article, the local stress-strain state of structures and constructions is investigated, various variants for the design of the boundary are taken into account: special lines, points. The acting forced deformations don’t satisfy the compatibility conditions. They have a finite discontinuity along the contact line (surface) of the domains, including the irregular point of the boundary, causing stresses. The subject of article is stress concentrators the singularity of the stress-strain state of structures and constructions exhibiting “constructive heterogeneity” and discontinuous forced deformations determined on polymer models of photoelasticity and defrosting of deformations. A complex theoretical-numerical-experimental approach, for obtaining and analyzing the stress state in the neighborhood of the irregular point of the plane domain boundary, is proposed to extrapolate reliable experimental data to a domain where the fringe contour is not readable.

scholarly journals Stress-strain state of the storage silos under the action of the asymmetric load

2018 ◽  
Vol 230 ◽  
pp. 02018 ◽  
Author(s):  
Nataliia Makhinko
Keyword(s):  
Cross Sections ◽  
Strain State ◽  
Wind Load ◽  
Exponential Dependence ◽  
Engineering Practice ◽  
Stress Strain ◽  
Cross Sectional ◽  
Stress Strain State ◽  
Construction Design ◽  
Cross Section Area

This paper deals with the investigation of work of the vertical steel cylindrical storage silos for grain with the different thickness of casing sheets and stiffeners at different height sunder the asymmetric wind load. Construction is designed using the analytical method involving decomposition of load into the completed trigonometric series and adding separate stress-strain states of k influence. The construction design model is a thin-walled cylindrical shell reinforced with vertical stiffeners. According to the shell theory, all unknown elements of the stress-strain states from the wind load components are expressed by unknown function ξk (x). In the analysis, the introduced hypotheses were used, which provides for using exponential dependence to describe the thickness changing law of the casing sheets and stiffeners and the equality of the change rate of these characteristics. The obtained results for silos with corrugated wall showed that the desired function which characterizes the stress-strain state of the construction is determined by ratio of the total cross-section area of all stiffeners to the cross-sectional area of the silo provided this ratio is constant at all heights. Represented calculation formulas for radial, circular and longitudinal displacements, and for strains in cross-sections are simple enough for using in the engineering practice.

scholarly journals Physically nonlinear deformation of a thin interphase inclusion under antiplane problem conditions

2019 ◽  
pp. 42-54
Author(s):  
Yosyf Piskozub ◽  
Heorgiy Sulym ◽  
Liubov Piskozub
Keyword(s):  
Nonlinear Deformation ◽  
Strain State ◽  
Variable Coefficients ◽  
The Body ◽  
Thin Inclusion ◽  
Stress Strain ◽  
Limit Values ◽  
Stress Strain State ◽  
Physically Nonlinear Deformation ◽  
Antiplane Problem

The longitudinal shear problem of the bimaterial with thin physically nonlinear inclusion at the interface matrix materials is considered. The solution of the formulated problem is constructed by the method of the conjugation of limit values of analytical functions with the use of the jump function method. A model of thin inclusion with arbitrary nonlinear strain characteristics is constructed. The solution of the problem is reduced to a system of singular integral equations with variable coefficients. A convergent iteration method for solving such a system for different types of physically nonlinear deformation is proposed. An incremental calculation method for calculating stress-strain state under multistep (including cyclic) quasi-static loading is developed. Numerical calculations of the body stress-strain state for various values of the parameters of the nonlinearity of the inclusion material are carried out. Their influence on the mode of deformation of the matrix under loading by a balanced system of concentrated forces is investigated.

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