Experimental study of the strength and durability of metal-composite high-pressure tanks

2019 ◽  
Vol 85 (1(I)) ◽  
pp. 49-56 ◽  
Author(s):  
A. M. Lepikhin ◽  
V. V. Moskvichev ◽  
A. E. Burov ◽  
E. V. Aniskovich ◽  
A. P. Cherniaev ◽  
...  
Keyword(s):  
High Pressure ◽  
Strain State ◽  
Full Scale ◽  
Fracture Mechanisms ◽  
Metal Composite ◽  
Test Results ◽  
Stress Strain ◽  
Pneumatic Pressure ◽  
Stress Strain State ◽  
Composite Tank

The results of unique experimental studies of the strength and service life of a metal-composite high-pressure tank are presented. The goal of the study is to analyze the fracture mechanisms and evaluate the strength characteristics of the structure. The methodology included tests of full-scale samples of the tank for durability under short-term static, long-term static and cyclic loading with internal pneumatic pressure. Generalized test results and data of visual measurements, instrumental and acoustic-emission control of deformation processes, accumulation of damages and destruction of full-scale tank samples are presented. Analysis of the strength and stiffness of the structure exposed to internal pneumatic pressure is presented. The types of limiting states of the tanks have been established experimentally. Change in the stress-strain state of the tank under cyclic and prolonged static loading is considered. Specific features of the mechanisms of destruction of a metal-composite tank are determined taking into account the role of strain of the metal liner. The calculated and experimental estimates of the energy potential of destruction and the size of the area affected upon destruction of the tank are presented. Analysis of test results showed that the tank has high strength and resource characteristics that meet the requirements of the design documentation. The results of the experiments are in good agreement with the results of numerical calculations and analysis of the stress-strain state and mechanisms of destruction of the metal-composite tank.

scholarly journals Numerical simulation of the stress strain state of base of the multi-helix screw pile under static loading in clay soil

2020 ◽  
pp. 28-36
Author(s):  
Volodymyr Sedin ◽  
Vladyslav Kovba ◽  
Yurii Volnianskyi ◽  
Kateryna Bikus
Keyword(s):  
Numerical Modeling ◽  
Bearing Capacity ◽  
Static Loading ◽  
Strain State ◽  
Clay Soil ◽  
Full Scale ◽  
Stress Strain ◽  
Foundation Construction ◽  
Stress Strain State ◽  
Screw Pile

A full-scale experiment was conducted to study the operation of a multi-helix screw pile under static pressing and pulling load in dusty clay soil. Based on the full-scale test of a multi-helix screw pile under static loading in dusty clay soil, numerical modeling of the stress-strain state of the base of the multi-helix screw pile was performed. Multi-helix screw piles are actively used all over the world, and have also become widespread in Ukraine. Foundations made of multi-helix screw piles are often used for industrial construction as well as the foundations of low-rise buildings and structures. Despite the growing demand for the use of multi-helix screw piles in modern construction, there is no official document calculating the features of their design and bearing capacity of a multi-helix screw pile. This poses a number of new tasks for engineers and geotechnical: a) development of new modern calculation methods; b) development and use of modern normative documents and recommendations for the calculation of foundations from multi-helix screw piles in various soil conditions; с) use of computer-aided design systems for calculation of complex geotechnical tasks; d) development of calculation models that will take into account nonlinear models of deformation of materials and soil base. Foundations made of multi-helix screw piles are a promising direction in the field of foundation construction due to the reduction of the duration of the foundation and its economic. This requires the development of regulations with recommendations for the calculation and use of multi-helix screw piles in the field of foundation construction, development of modern calculation models for the calculation of bearing capacity and settling of multi-helix screw piles in different geological conditions. Based on the results of the field study of the work of multi-helix screw piles in clay soils, numerical modeling of the stress-strain state of the base of the multi-turn pile was performed, and their results were compared.

scholarly journals Numerical research of horizontally weighted bases from hollow circular piles with the reduced step

2016 ◽  
Vol 4 (2) ◽  
pp. 0-0
Author(s):  
Светлана Ямаева ◽  
Svetlana Yamaeva ◽  
Олег Денисов ◽  
Oleg Denisov
Keyword(s):  
Comparative Analysis ◽  
Computational Model ◽  
Numerical Simulations ◽  
Numerical Investigation ◽  
Strain State ◽  
Full Scale ◽  
Stress Strain ◽  
Stress Strain State ◽  
Numerical Research ◽  
Full Scale Tests

The results of numerical investigation of the stress-strain state of subgrade groups of hollow circular piles with diameters of less than three step under the action of horizontal loads. Shows the effect of pitch on piles move horizontally loaded the bases and a comparative analysis of the nature of their work with full-scale tests and numerical simulations. Pseudoplane used computational model of the foundation for the theory of local deformations and linearly deformable half.

scholarly journals Experimental investigation of the performance of metal beams as a part of a vaulted brick slab

2021 ◽  
Vol 18 (2) ◽  
pp. 42-48
Author(s):  
E. S. Enkina ◽  
◽  
A. L. Tukkiya ◽  
A. V. Melnikov ◽  
O. V. Golykh ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Bearing Capacity ◽  
Strain State ◽  
Test Results ◽  
Stress Strain ◽  
Stress Strain State

Up to now, the performance of the metal beam as a part of brick vault has been studied very little. There was carried out an in-place test of the vaulted brick slab section to explore the stress-strain state of the beam. The method of conducting the in-place test of the metal beam as a part of brick vault is described and the test results are submitted. Based on the results of the study, the authors have come to the conclusion that the bearing capacity of the metal beam is sufficiently high under the regarded conditions.

Impact Estimation of a Transient Temperature Field on the Service Life of the High Pressure Rotor of K-1000-60/3000 Turbine

2021 ◽  
Vol 23 ◽  
pp. 408-419
Author(s):  
Olga Chernousenko ◽  
Tetyana Nikulenkova ◽  
Anatolii Nikulenkov
Keyword(s):  
High Pressure ◽  
Service Life ◽  
Steam Turbine ◽  
Strain State ◽  
Life Assessment ◽  
Single Type ◽  
Stress Strain ◽  
Stress Strain State ◽  
Operation Modes ◽  
Numerical Examination

The one of purposes of this paper is to estimation some impact on the service life of the high-pressure cylinder rotor of a typical high-speed turbine K-1000-60/3000. The residual life assessment of power equipment would require determining viability and damage of its base metal. Typical degradation mechanisms of steam turbine equipment include long-term strength reduction and low cycle fatigue accumulation. Intensity of their impact is determined by a numerical examination of equipment thermal (TS) and stress strain states (SSS) for standard operation modes. To perform a numerical examination of the stress strain state would require solving a thermal conductivity boundary problem in quasi-stationary (for nomal operation modes) and nonstationary models (for transients). It is convenient to solve such problems of mathematical physics through discretization of the calculation object using the finite element method (Chernousenko et al. 2018). The service life of steam turbine is determined as an individual one and is assigned based on the results of individual an inspection of a separate element or the largest group of single-type equipment elements of the considered plant. The fleet service life being reached is followed by diagnostics of specific units of power installations and analysis of their operation, measurement of actual dimensions of components, examination of structure, properties and damage accumulation in the metal, non-destructive testing and estimate of stress strain state and residual service life of the component. The results of performed studies are used to determine an individual service life of each element of energy equipment (Nikulenkov et al. 2018).

scholarly journals Creating a node connection for scaffolding and studying its stress-strain state by means of a full-scale test

2020 ◽  
Vol 890 ◽  
pp. 012043
Author(s):  
Evgeny Derevyanko ◽  
Gennady Shmelev ◽  
Lenar Khaidarov ◽  
Anatoliy Antonov ◽  
Ilshat Galimullin
Keyword(s):  
Strain State ◽  
Full Scale ◽  
Full Scale Test ◽  
Stress Strain ◽  
Stress Strain State ◽  
Scale Test
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