Influence of harmonic components of non-circularity and non-cylindricity on the formation of stress-strain state of surface layers of parts in interference fit joints

2020 ◽  
pp. 3-7
Author(s):  
A.A. Zyuzin ◽  
I.S. Konstantinova ◽  
B.N. Kaz'min ◽  
M.D. Yurov
Keyword(s):  
Strain State ◽  
Low Frequency ◽  
Surface Layers ◽  
Stress Strain ◽  
Shape Deviation ◽  
Cross Sectional ◽  
Interference Fit ◽  
Stress Strain State ◽  
Shape Errors ◽  
Harmonic Components

The results of the study of the influence of the harmonic components of non-circularity and non-cylindricity on the formation of the stress-strain state (SSS) of the surface layers of parts in interference fit joints are presented. It is determined, that in order to increase the reliability of fixed joints of parts in the shape errors of high-precision mounting surfaces, it is necessary to minimize the amplitudes of the harmonic components of the low-frequency range of the 2nd, 3rd and 4th orders and form an isotropic microrelief. Keywords interference fit joints, non-circularity of cross-sectional profiles, harmonic components, non-cylindricity, microtopography, microasperities, stress-strain state, shape deviation spectra. [email protected]

scholarly journals Calculated cross-sectional model and stages of the stress-strain state of the wood element for transverse bending

2019 ◽  
Author(s):  
Svyatoslav S. Gomon ◽  
Svyatoslav Gomon ◽  
Victor Karavan ◽  
Petro Gomon ◽  
Justyna Sobczak-Piąstka
Keyword(s):  
Strain State ◽  
Stress Strain ◽  
Cross Sectional ◽  
Stress Strain State ◽  
Transverse Bending ◽  
Sectional Model

Bending Process Simulation of a Flat Workpiece with Various Cross-Sectional Mechanical Properties with PAM-STAMP 2G

2016 ◽  
Vol 685 ◽  
pp. 133-136 ◽  
Author(s):  
Fedor Grechnikov ◽  
Yurii Gorshkov ◽  
Yaroslav Erisov
Keyword(s):  
Mechanical Properties ◽  
Heat Affected Zone ◽  
Process Simulation ◽  
Laser Cutting ◽  
Strain State ◽  
Stress Strain ◽  
Cross Sectional ◽  
Stress Strain State ◽  
Bending Process

We have simulated an aluminum workpiece tool bending process with and without consideration of the heat affected zone after laser cutting with PAM-STAMP 2G. To describe the heat affected zone we have used a customized software option for calculating welded materials and dissimilar ones. We have also provided an analysis of the stress-strain state with a different scale of mechanical properties of the material on its “edge” and in the center of the workpiece.

Examination of the stress-strain state and selection of criteria for the optimum design of bolted joints with interference fit

1982 ◽  
Vol 14 (7) ◽  
pp. 902-908
Author(s):  
A. A. Lebedev ◽  
Ya. N. Robakovskil ◽  
S. �. Umanskii ◽  
I. V. Burau ◽  
Yu. L. Kozhevnikov ◽  
...  
Keyword(s):  
Optimum Design ◽  
Strain State ◽  
Bolted Joints ◽  
Stress Strain ◽  
Interference Fit ◽  
Stress Strain State ◽  
Selection Of

scholarly journals Computer modeling of volumetric damageability in the mine roadway neighbourhood

Doklady BGUIR ◽  
2020 ◽  
Vol 18 (7) ◽  
pp. 47-54
Author(s):  
S. S. Sherbakov ◽  
L. A. Shemet ◽  
A. A. Nasan
Keyword(s):  
Finite Element ◽  
Computer Modeling ◽  
Solid Body ◽  
Strain State ◽  
Rock Massif ◽  
Limited Area ◽  
Stress Strain ◽  
Cross Sectional ◽  
Stress Strain State ◽  
Mine Roadway

The object of research is a rock massif with various cross-sectional shapes of roadway. The purpose of work: computer modeling of stress-strain state and volumetric damageability in the neighbourhood of a mine roadway. The undisturbed rock massif has an initial stress-strain state (under its own weight) before a mine roadway is formed. Therefore, to determine the stress-strain state of the rock massif with the mine roadway, we must first calculate the stress state of the rock massif without the roadway and then take it into account as a pre-stressed state for the rock massif therewith. Damageability assessment of the rock massif with a mine roadway was carried out based on the obtained distributions of stresses and strains. We calculated volumetric damageability through the model of a deformed solid body with dangerous volume. Dangerous volume is a limited area where stresses or strains exceed the predetermined threshold. Calculation of dangerous volumes and integral damageability was carried out in the finite element package ANSYS. The program was written in APDL. The ratios between the existing and limiting stresses was calculated for each finite element. The elements for which this ratio exceeds unity will form a dangerous volume for the whole model. As a result, we have an array of finite elements constituting the dangerous volume and its value. The developed method for assessing damageability in the mine roadway neighbourhood takes into account various cross-sectional shapes of the mine roadway and its depth. The relevance of studying possible destruction regions using the model of a deformed solid body with dangerous volume was substantiated.

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 Theory of “dissolution” and “condensation” of the physical geometric characteristics of an arbitrary cross-section under the action of torsion with bending

2019 ◽  
Vol 15 (4) ◽  
pp. 261-270
Author(s):  
Vladimir I. Kolchunov ◽  
Aleksej I. Demyanov ◽  
Nikolay V. Naumov
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Strain State ◽  
Rectangular Cross Section ◽  
Arbitrary Cross Section ◽  
Large Circle ◽  
Stress Strain ◽  
Cross Sectional ◽  
Tangential Stresses ◽  
Stress Strain State

Aim of research - to continue the development of methods for determining the stress-strain state of rods during torsion using materials resistance methods. Methods. A new approach for determining tangential torsional stresses for arbitrary cross sectional rods, based on simplified assumptions of material resistance, is proposed. The main feature of this approach is the approximation of rectangular or any complex cross section of reinforced concrete structures by describing a large circle around the cross section and splitting it into small squares with circles inscribed into them. Results. Three theorems have been formulated, the first of which relates the accumulation of tangential stresses (increments) from the edges of a rectangle to the middle of a rectangular section with the formula for determining tangent stresses for round sections. The second theorem allows to establish a connection between the tangential stresses calculated for each of the small squares-circles and the tangent stresses of the large circle through their increments. The third theorem makes it possible to find tangential stresses for each of the small square circles. The proposed approach allows to remove the need to use special tables for the calculation and not only in the elastic stage. It also makes it possible to separate the stress-strain state in the whole set of round cross-sections from the additional field caused by the deplanation of the rectangular cross-section. In addition, the proposed approach makes it possible to take into account the concentration of angular deformations in the incoming angles and other places with changing geometric parameters.

scholarly journals Influence of the Cross-Sectional Shape of a Reinforced Bimodular Beam on the Stress-Strain State in a Transverse Impact

Buildings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 248
Author(s):  
Alexey Beskopylny ◽  
Elena Kadomtseva ◽  
Besarion Meskhi ◽  
Grigory Strelnikov ◽  
Oleg Polushkin
Keyword(s):  
Reinforced Concrete ◽  
Stress State ◽  
Cross Section ◽  
Strain State ◽  
Transverse Impact ◽  
Stress Strain ◽  
Cross Sectional ◽  
Stress Strain State ◽  
The Cross ◽  
The Impact

The paper considers the stress-strain state of a reinforced concrete beam, as a bimodular material, under the action of an impact. The behavior of bimodular concretes with different moduli of elasticity in tension and compression has not been studied enough. At the same time, taking into account the bimodularity of concrete makes it possible to design a more economical structure, especially for dynamic load. In this article, the impact is considered as an absolutely plastic impact of an absolutely rigid body on an elastic system. The stress state is investigated for beams of rectangular, T-section and I-sections, and is compared with and without the bimodularity of reinforced concrete. The analysis of the dependence of the stress state on the shape, cross-sectional dimensions, and the location of reinforcing bars in the compressed and tensioned zones was carried out for lightweight concrete (Et < Ec) and for heavy concrete (Et > Ec) under the action of shock load with and without regard to the mass of the beam. The numerical study shows that taking into account the mass of the beam upon impact significantly decreases the magnitude of the normal stresses in both the tensioned and compressed zones. Beams of rectangular cross-section have the highest load-bearing capacity when the cross-section height is equal for both light and heavy concrete. An increase in the size of the flange of the I-beam in the stretched zone leads to a sharp decrease in normal tensile stresses and a slight increase in normal compressive stresses. The proposed engineering method makes it possible to numerically study the effect on the stress-strain state of a beam under the action of a concentrated impact of various geometric characteristics of the cross-section, bimodularity of the material, size, number and location of reinforcement.

Simulation of the Stress-Strain State of Diesel Engine Pistons Taking into Account Inelastic Deformations

2020 ◽  
pp. 29-36
Author(s):  
L.L. Myagkov ◽  
S.M. Sivachev
Keyword(s):  
Finite Element ◽  
Diesel Engines ◽  
Strain State ◽  
Low Frequency ◽  
Uniaxial Tensile ◽  
Creep Tests ◽  
Stress Strain ◽  
Element Analysis ◽  
Stress Strain State ◽  
Creep Models

The failure of aluminum pistons of diesel engines is often associated with formation of cracks originating at the bowl rim. The appearance of cracks is a consequence of thermal fatigue of the material due to low-frequency cycles of heating and cooling of the piston during the engine start-up, operation at various speed and load conditions, and subsequent shutdown. To assess the lifetime of the bowl rim, it is necessary to simulate non-isothermal elastoplastic deformation of the alloy using material plasticity and creep models available in finite element analysis software (e.g. ANSYS). This paper presents the results of uniaxial tensile and creep tests of proportional specimens made from piston blanks of the V-type diesel engines YaMZ-658. The piston material is AlSi12CuNiMg silumin alloy. The article describes methods for determining constants in plasticity and creep models. The results of numerical simulation of the piston’s stress-strain state for the start — nominal power mode — stop cycle using the finite element method are presented. Conclusions about the presence of plastic and creep strains at the piston edge are drawn.

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