scholarly journals Application of a computational and experimental method of analysis the complexly stressed state of rubber membranes for effective solutions for their production

2021 ◽  
Vol 83 (2) ◽  
pp. 230-236
Author(s):  
D. V. Kudelin ◽  
T. N. Nesiolovskaya
Keyword(s):  
Stressed State ◽  
Experimental Method ◽  
Strain State ◽  
Physical And Mechanical Properties ◽  
Standard Test ◽  
Spherical Indenter ◽  
Bag Filter ◽  
Stress Strain ◽  
Rubber Membrane ◽  
Stress Strain State

The competitiveness of rubber membranes determined by their durability, quality, reliability, including the time required to create. During operation, the membranes undergo complex deformations, as a result of which a large number of potential destruction zones of a different nature arise, which can lead to the failure of the product. The standard test methods used in the development of formulations for membranes involve testing the material under uniaxial tension conditions in most cases and do not take into account the actual loading conditions of the product during operation, which significantly increases the development time of new formulations for membranes. The paper presents and applies in practice a computational and experimental method of analysis the complexly stressed state of rubber membranes, including carrying out simple laboratory tests in a heterogeneous complexly stressed state, which is realized during the operation of rubber membranes, and analyzing the stress-strain state by the finite element method. An inhomogeneous complexly stressed state was realized by forcing the rubber membrane with a spherical indenter. The application of a computational-experimental method for analyzing the complexly stressed state of rubber membranes is considered on the example of a rubber corrugated membrane of an automatic valve of a bag filter purge system. An assessment of the physical and mechanical properties of rubbers in a heterogeneous complexly stressed state was carried out, as well as an analysis of the stress-strain state of the membrane when it was loaded with a spherical indenter, which made it possible to identify the most dangerous zones of the section. The complex use of this method made it possible to improve the resource of this corrugated membrane by thirty five percent in comparison with the standard, while reducing the creation time.

Analysis of the stress-strain state of copper M0B under different schemes of equal channel angular pressing and its effect on the structure and physical and mechanical properties

2019 ◽  
pp. 47-53
Author(s):  
L. F. Sennikova ◽  
G. K. Volkova ◽  
V. M. Tkachenko
Keyword(s):  
Equal Channel Angular Pressing ◽  
Strain State ◽  
Physical And Mechanical Properties ◽  
Strength Properties ◽  
Stress Strain ◽  
Loading Pattern ◽  
Stress Strain State ◽  
Angular Pressing ◽  
Fine Copper ◽  
Copper Structure

The results of studies of the stress-strain state of copper M0b after deformation under different schemes of equal channel angular pressing (ECAP) are presented. The level of macro and micro stresses in copper has been determined in various ECAP modes. It is shown that the strength properties, deformation porosity and parameters of the fine copper structure differ depending on the loading pattern.

scholarly journals About One of the Approaches for the Research of the Stress-Strain State of a Flange Connection with a Seal Made of an Alloy with Shape Memory

2022 ◽  
Author(s):  
A. Boikov
Keyword(s):  
Mechanical Properties ◽  
Shape Memory ◽  
Contact Zone ◽  
Axial Compression ◽  
Strain State ◽  
Physical And Mechanical Properties ◽  
Stress Strain ◽  
Flange Connection ◽  
Stress Strain State ◽  
Alternative Approach

Abstract. Design features of a flange connection with a seal made of an alloy with shape memory and the most commonly used methods of researching of the stress-strain state of such connections are estimated. Alternative approach for stress-strain state analysis is proposed, it is based on modeling of the contact zone of the sealing surfaces by means of an equivalent gap between the layers, the value of which changes during axial compression of the multilayer ring and goes into tension. Formulas for determining of contact stresses at the border of layers, which take into consideration the variable physical and mechanical properties of the materials of each layer are presented.

Analysis of the Stress-Strain State of Ceramic Brick when Tested for Compressive Strength

2019 ◽  
Vol 974 ◽  
pp. 510-514
Author(s):  
Irina A. Serebryanaya ◽  
Andrey A. Matrosov ◽  
Natalia A. Poryadina ◽  
Arkady N. Soloviev
Keyword(s):  
Strain State ◽  
Surface Preparation ◽  
Breaking Load ◽  
Standard Test ◽  
Test Method ◽  
Ceramic Brick ◽  
Stress Strain ◽  
Friction Forces ◽  
Stress Strain State ◽  
Scale Experiment

The article analyzes the change in the stress-strain state of ceramic brick samples when tested in compression, depending on the variable parameters - the type of sample and the method of surface preparation. The experiment showed that the friction forces arising in the “sample-plate test press” zone of contact have a significant effect on the deformation conditions of the samples and lead to an uneven distribution of the breaking load over the surface. This in turn leads to an overestimation of the strength characteristics of the lot, and, consequently, to errors in the calculations of the bearing capacity of the structures. A numerical analysis of the stress distribution also showed that for the samples aligned by grinding and with the help of a mortar; the effect of compression caused by friction forces can be traced. Thus, the results of the numerical experiment are in good agreement with the results of the full-scale experiment. To increase the reliability of the test results, it is necessary to reduce the influence of friction forces and provide conditions for the realization of uniaxial compression. In this regard, it is necessary to adjust the standard test method, namely to use the technical felt gaskets as a method of preparing the surface.

scholarly journals Subsidence deformations of the foundations of hydraulic structures

2021 ◽  
Vol 264 ◽  
pp. 03069
Author(s):  
Rustam Хujakulov ◽  
M Zaripov ◽  
U Normurodov
Keyword(s):  
Stressed State ◽  
Strain State ◽  
Stress Redistribution ◽  
Hydraulic Structures ◽  
Physical Processes ◽  
Irrigation Systems ◽  
Stress Strain ◽  
Regulatory Documents ◽  
Stress Strain State

One of the most important tasks in designing and constructing reclamation network structures on loess subsidence soils is to ensure their long-term trouble-free operation. The improvement of methods for the design of hydraulic structures on subsidence foundations requires further study of very complex physical processes occurring in the foundations of structures during their construction and operation. This is confirmed by the fact that even if all the requirements and recommendations of regulatory documents for the design of irrigation systems on subsiding soils are observed, the deformations of the foundations of structures often significantly exceed the calculated ones, which can cause a loss of serviceability of irrigation structures. This determines the need for further study peculiarities of interaction of irrigation structures with their subsidence bases. This article is devoted to this problem, in particular, to the study of the influence of stress redistribution in wetted subsidence foundations of hydraulic structures on the stressed state of their elements and the stress-strain state of loess subsidence foundations on the models of float bets of hydraulic structures in the Karshi steppe.

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