Sealing of Pipelines Flange Connections in Conditions of Fasteners Tightening Torque Reducing

2014 ◽  
Vol 630 ◽  
pp. 283-287 ◽  
Author(s):  
Oleg Bondarenko ◽  
Anatoliy Dziuba
Keyword(s):  
Strain State ◽  
Pipe Material ◽  
Space Technology ◽  
Stress Strain ◽  
Tightening Torque ◽  
Flange Connection ◽  
Stress Strain State ◽  
Technical Systems ◽  
Natural Will

Flanged connections are widely used in pipelines of various technical systems. Task of reducing the consumption of materials pipelines , ensuring their long-term tightness is highly relevant for shipbuilding , aviation and space technology and other mashinebuilding. In this paper, the task of deliberately reducing torque fasteners flange connection at build pipelines to ensure the initial tightness of the connection , reducing the weight of the pipeline , the alignment of the stress- strain state of the compound and determining the residual torque fasteners, providing connections for leaks. With decreasing torque fasteners ( intentional or natural ) will be sealed flanged if the remaining torque is sufficient to compensate for the pressure in the pipeline and prevent shear movement of the flange and gasket relative to each other . Found that the flange connection remains sealed with natural and deliberate reduction torque fasteners to 75-80 % compared to the initial .Sealing flange connections using technology and standard fastenings to reduce their weight by 10-50 %, and the replacement of flanges and pipe material - a whole lot of pipelines at 30-65 %.

Flexible bar buckling under short-time and long-term compressions

2020 ◽  
Vol 17 (1) ◽  
pp. 199-210
Author(s):  
Anton Egorov ◽  
Vitaly Egorov
Keyword(s):  
Dynamic Analysis ◽  
Mechanical Behaviour ◽  
Strain State ◽  
Stress Strain ◽  
Content Type ◽  
Stress Strain State ◽  
Bar Buckling ◽  
Comparison Of The Results ◽  
Short Time

PurposeThe purpose of this paper is to expand possibilities of stability computing method when performing a dynamic analysis of bar- or rod-shaped elements for actual structures.Design/methodology/approachThe methodology is based on the changes of stress–strain state of the bar-shaped elements at the moment of buckling. The proposed method is based on three assumptions. Firstly, the spatial stress–strain state is determined in the bar. Secondly, technological deviations inherent in real structures are introduced into the bar. Thirdly, mechanical behaviour of the bar is investigated in the mode of real time, which makes it possible to take into account wave deformation processes in the bar. To implement the suggested method of analysis, LS-DYNA package was selected in a dynamic formulation using solid finite elements.FindingsValidity of the proposed method is shown by an example of dynamic stability analysis of a steel flat thin bar with two types of loads: short-time and long-term axial compressions. Comparison of the results showed different nature of the mechanical behaviour of the bar: wave processes are observed under short-time loading, and continuous monotone ones are stated under long-term loads.Practical implicationsResearch results are applicable in the rocket and space industry.Originality/valueA new computer-based methodology for dynamic analysis of heterogeneous elastic-plastic bar-, rod-shaped structures under shock axial compressive loads is proposed.

Stress-strain state of an arch dam based on data of long-term on-site observations

1981 ◽  
Vol 15 (6) ◽  
pp. 360-365 ◽  
Author(s):  
I. F. Blinov ◽  
E. M. Mirzak ◽  
Yu. P. Shaikin
Keyword(s):  
Strain State ◽  
Arch Dam ◽  
Stress Strain ◽  
Stress Strain State

scholarly journals THE WAVE PROCESSES IN THREE-LAYER SHELLS OF ROTATIONWITH TAKING INTO ACCOUNT THE DISCRETE FILLER AT NON-STATIONARY LOADS

2020 ◽  
Author(s):  
Vladimyr Meish ◽  
◽  
Yuliia Meish ◽  
Keyword(s):  
Numerical Method ◽  
Strain State ◽  
Shell Structures ◽  
Sharp Change ◽  
Space Technology ◽  
Shells Of Revolution ◽  
Stress Strain ◽  
Shell Elements ◽  
Stress Strain State ◽  
Explicit Finite Difference

Thin-walled shell structures in the form of plates and shells of various shapes have a high bearing capacity, lightness, and relative ease of manufacture. Three-layer shell elements, which consist of two bearing layers and a filler, which ensures their joint work, are widely used in mechanical engineering, industrial and civil construction, aviation and space technology, shipbuilding. When calculating the strength of three-layer shell structures with a discrete filler under dynamic loads, it becomes necessary to determine the stress-strain state both in the area of a sharp change in the geometry of the structure and at a considerable distance from the heterogeneity. The complexity of the processes that arise in this case necessitates the use of modern numerical methods for solving dynamic problems of the behavior of three-layer shell elements with a discrete filler. In this regard, the determination of the stress-strain state of three-layer shells with a discrete filler under non-stationary loads and the development of an effective numerical method for solving problems of this class is an urgent problem in the mechanics of a deformable solid. On the basis of the theory of threelayered shells with applying the hypotheses for each layer the nonstationary vibrations threelayered shells of revolution with allowance of discrete fillers are investigated. Hamilton-Ostrogradskyy variational principle for dynamical processes is used for deduction of the motion equations. An efficient numerical method for solution of problems on nonstationary behaviour of threelayers shells of revolution with allowance of discrete fillers are used. The wide diapason of geometrical, and physico-mechanical parameters of nonhomohenes threelayered structure are considerated. On the basis of the offered model nonstationary problems of the forced nonlinear vibrations of threelayered shells of revolution of various structure are solved and analysed. The basis of the developed numerical method for the study of nonstationary oscillations is the application of explicit finite-difference schemes to solve the initial differential equations in partial derivatives. The theory is based on the relations of the theory of three-layer shells of revolution taking into account the discreteness of the filler, which are based on the hypotheses of the geometrically nonlinear theory of shells and rods of the Timoshenko type.

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.

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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