scholarly journals ANALYSES OF THE STRESS INTENSITY OF THE CYLINDRICAL TANK WALL AT THE PLACE OF THE GEOMETRICAL DEFECT

2010 ◽  
Vol 16 (2) ◽  
pp. 209-215 ◽  
Author(s):  
Konstantin Rasiulis ◽  
Kęstutis Gurkšnys
Keyword(s):  
Strain State ◽  
Individual Case ◽  
Tank Wall ◽  
Cylindrical Tank ◽  
Membrane Theory ◽  
Operation Period ◽  
The Common ◽  
Thin Walled ◽  
Cylindrical Tanks ◽  
The Ideal

Major repair or regular inspection of the large capacity thin‐walled tankages is very expensive. Steel cylindrical tanks are an individual case of the thin‐walled tankages. The common calculation of the tanks by analytical and numerical methods is not difficult. Strengthening the places, where a perfect calculated form is disturbed, that is, at the spots of in‐cuts, hatches, defects etc. is a responsible part of the design of such constructions. The problems of prevention of defects during the operation period and repairs, as well as possibility to assure quickly the safety of defective places of the constructions are more important than the common calculations. The main objective of the presented investigations is to identify stress/strain state of the wall tank with local imperfections from the ideal cylindrical surface, taking into account the membrane theory of the shells by using the finite element's method. Santrauka Didelio tūrio statiniu remontai arba net profilaktines apžiūros yra gana brangūs procesai. Metalines cilindrines talpyklos priskiriamos prie atskiros tūriniu plonasieniu konstrukciju grupes. Talpyklu reguliariu konstrukciju analitiniai ar skaitiniai skaičiavimai nera sudetingi. Bet tokiu vietu, kaip konstrukciju jungčiu bei technologines irangos prijungimo projektavi‐mas ar konstrukciju defektu analize yra gerokai svarbesne projektavimo dalis. Defektu prevencija naudojant talpyklas, taip pat defektuotu vietu sustiprinimas yra svarbesnis nei bendrieji talpyklu skaičiavimai. Šio darbo tikslas ‐ nustatyti realaus objekto cilindrines talpyklos sieneles su geometrinemis lokaliomis nuokrypomis itempiu ir deformaciju būvi pagal memb‐ranine kevalu skaičiavimo teorija, taikant baigtiniu elementu metoda.

scholarly journals VERTICAL CYLINDRICAL TANK WITH ANGULAR GEOMETRICAL IMPERFECTION

2005 ◽  
Vol 11 (3) ◽  
pp. 175-183 ◽  
Author(s):  
Yevgeny Gorochov ◽  
Vladimir Muschanov ◽  
Alexander Kulik ◽  
Alexander Tsyplukhin
Keyword(s):  
Large Scale ◽  
Strain State ◽  
Local Stress ◽  
Scale Model ◽  
Stress And Strain ◽  
Tank Wall ◽  
Cylindrical Tank ◽  
Geometrical Imperfection ◽  
Large Scale Model ◽  
The Ideal

In this paper the results of experimental research are given for the stress and strain state of a near seam zone. The research is executed on large‐scale model of a zone of vertical cylindrical tank assembly connection with a geometrical imperfection. As a result, the dependence is received between values of the basic stress, which take place in a tank wall of the ideal form, and local stress, which arise in a seam zone. It is proved by experiments that when the ring stress achieves value 100 mPa, then the local stress in a near seam zone achieves the stress of 280–300 mPa. Hence, they exceed three times their major importance. These stress values are coordinated satisfactorily to the data, which are received by a theoretical way.

Introduction

2017 ◽  
Author(s):  
Erika Fischer-Lichte
Keyword(s):  
Middle Class ◽  
Social Group ◽  
Family Values ◽  
Court Culture ◽  
Common Root ◽  
New Family ◽  
The Common ◽  
German Court ◽  
The Ideal

The introduction ‘Philhellenism and Theatromania’ retraces the emergence of these two phenomena in the German middle class. The year 1755 marks a watershed in this regard: it saw the publication of J. J. Winckelmann’s treatise Reflections on the Painting and Sculpture of the Greeks and the premiere of G. E. Lessing’s first domestic tragedy Miß Sara Sampson. Both share the common root and motivation once and for all to banish Frenchified German court culture. While Winckelmann’s treatise praised the ‘noble simplicity’ and ‘quiet greatness’ of the Greek masterpieces, Lessing’s play advocated new family values and the ideal of ‘naturalness’ as the true virtues of the middle class. The merging of Philhellenism as the cult of beauty with theatromania as the quest for identifying in a social group and as an individual provided the basic condition for staging Greek tragedies.

scholarly journals From Norms to Facts: The Realization of Rights in Common and Civil Private Law

2011 ◽  
Vol 56 (1) ◽  
pp. 77-114 ◽  
Author(s):  
Helge Dedek
Keyword(s):  
Legal System ◽  
Deep Structure ◽  
Common Law ◽  
Social Reality ◽  
Judicial Decision Making ◽  
Legal Traditions ◽  
The United Kingdom ◽  
The Common ◽  
Legal Concepts ◽  
The Ideal

Every legal system that ties judicial decision making to a body of preconceived norms has to face the tension between the normative formulation of the ideal and its approximation in social reality. In the parlance of the common law, it is, more concretely, the remedy that bridges the gap between the ideal and the real, or, rather, between norms and facts. In the common law world—particularly in the United Kingdom and the Commonwealth—a lively discourse has developed around the question of how rights relate to remedies. To the civilian legal scholar—used to thinking within a framework that strictly categorizes terms like substance and procedure, subjective right, action, and execution—the concept of remedy remains a mystery. The lack of “remedy” in the vocabulary of the civil law is more than just a matter of attaching different labels to functional equivalents, it is the expression of a different way of thinking about law. Only if a legal system is capable of satisfactorily transposing the abstract discourse of the law into social reality does the legal machinery fulfill its purpose: due to the pivotal importance of this translational process, the way it is cast in legal concepts thus allows for an insight into the deep structure of a legal culture, and, convergence notwithstanding, the remaining epistemological differences between the legal traditions of the West. A mixed jurisdiction must reflect upon these differences in order to understand its own condition and to define its future course.

Fluid Pressures on Unanchored Rigid Flat-Bottom Cylindrical Tanks Under Action of Uplifting Acceleration

2009 ◽  
Vol 132 (1) ◽  
Author(s):  
Tomoyo Taniguchi ◽  
Yoshinori Ando
Keyword(s):  
Velocity Potential ◽  
Fluid Velocity ◽  
Fluid Pressure ◽  
Angular Acceleration ◽  
Bottom Plate ◽  
Center Line ◽  
Cylindrical Tank ◽  
Cylindrical Coordinates ◽  
Flat Bottom ◽  
Cylindrical Tanks

To protect flat-bottom cylindrical tanks against severe damage from uplift motion, accurate evaluation of accompanying fluid pressures is indispensable. This paper presents a mathematical solution for evaluating the fluid pressure on a rigid flat-bottom cylindrical tank in the same manner as the procedure outlined and discussed previously by the authors (Taniguchi, T., and Ando, Y., 2010, “Fluid Pressures on Unanchored Rigid Rectangular Tanks Under Action of Uplifting Acceleration,” ASME J. Pressure Vessel Technol., 132(1), p. 011801). With perfect fluid and velocity potential assumed, the Laplace equation in cylindrical coordinates gives a continuity equation, while fluid velocity imparted by the displacement (and its time derivatives) of the shell and bottom plate of the tank defines boundary conditions. The velocity potential is solved with the Fourier–Bessel expansion, and its derivative, with respect to time, gives the fluid pressure at an arbitrary point inside the tank. In practice, designers have to calculate the fluid pressure on the tank whose perimeter of the bottom plate lifts off the ground like a crescent in plan view. However, the asymmetric boundary condition given by the fluid velocity imparted by the deformation of the crescent-like uplift region at the bottom cannot be expressed properly in cylindrical coordinates. This paper examines applicability of a slice model, which is a rigid rectangular tank with a unit depth vertically sliced out of a rigid flat-bottom cylindrical tank with a certain deviation from (in parallel to) the center line of the tank. A mathematical solution for evaluating the fluid pressure on a rigid flat-bottom cylindrical tank accompanying the angular acceleration acting on the pivoting bottom edge of the tank is given by an explicit function of a dimensional variable of the tank, but with Fourier series. It well converges with a few first terms of the Fourier series and accurately calculates the values of the fluid pressure on the tank. In addition, the slice model approximates well the values of the fluid pressure on the shell of a rigid flat-bottom cylindrical tank for any points deviated from the center line. For the designers’ convenience, diagrams that depict the fluid pressures normalized by the maximum tangential acceleration given by the product of the angular acceleration and diagonals of the tank are also presented. The proposed mathematical and graphical methods are cost effective and aid in the design of the flat-bottom cylindrical tanks that allow the uplifting of the bottom plate.

Sloshing in Rectangular and Cylindrical Tanks

2002 ◽  
Vol 46 (03) ◽  
pp. 186-200 ◽  
Author(s):  
Pierre C. Sames ◽  
Delphine Marcouly ◽  
Thomas E. Schellin
Keyword(s):  
Free Surface ◽  
Finite Volume ◽  
Temporal Evolution ◽  
Numerical Study ◽  
Computational Method ◽  
Test Cases ◽  
Grid Refinement ◽  
Cylindrical Tank ◽  
Excitation Period ◽  
Cylindrical Tanks

To validate an existing finite volume computational method, featuring a novel scheme to capture the temporal evolution of the free surface, fluid motions in partially filled tanks were simulated. The purpose was to compare computational and experimental results for test cases where measurements were available. Investigations comprised sloshing in a rectangular tank with a baffle at 60% filling level and in a cylindrical tank at 50% filling level. The numerical study started with examining effects of systematic grid refinement and concluded with examining effects of three-dimensionality and effects of variation of excitation period and amplitude. Predicted time traces of pressures and forces compared favorably with measurements.

Development of a Methodology for Model Testing of Utor Welded Joints of a Vertical Cylindrical Tank

2021 ◽  
pp. 21-27
Author(s):  
D.A. Neganov ◽  
◽  
A.E. Zorin ◽  
O.I. Kolesnikov ◽  
G.V. Nesterov ◽  
...  
Keyword(s):  
Welded Joints ◽  
Strain State ◽  
Welded Joint ◽  
Design Parameters ◽  
Cylindrical Tank ◽  
Stress Strain ◽  
The Real ◽  
Stress Strain State ◽  
Hydraulic Machines ◽  
Wide Range

The methodology of laboratory modeling of the loading of utor welded joint of the tank is presented. The methodology is based on testing of the special design sample. It allows under uniaxial tension on the typical servo-hydraulic machines to reproduce in the zone of a utor welded joint the combined action of bending and shear forces, similar to that which occurs during the operation of a vertical cylindrical tank. To assess the distribution of the stress-strain state in the proposed design of the sample under its loading, the finite element modeling was performed in the ANSYS software package. It showed the fundamental correspondence of the stress distribution in the zone of the utor node in the sample and in the real tank. The experimental studies consisted in carrying out tests for the durability of a series of 16 samples loaded with the maximum force in the cycle, causing the calculated stresses in the zone of the welded utor node in the range of 100–200 % from the maximum permissible ones. The obtained results showed that the maximum loaded zone, where the destruction of the samples occurred, is the near-seam zone of the utor welded joint on the inside of the tank. This corresponds to the statistics of the real tank failures. It is established that the developed methodology ensures the possibility of carrying out correct resource tests of the tank utor welded joints. It is also possible to vary the stress-strain state scheme within a wide range in the area of the utor welded joint by changing the design parameters of the test sample. In compliance with the regulated welding technologies and the absence of unacceptable defects in the welded joint, the utor node has a high resource, which significantly exceeding 50 years of the tank operation.

scholarly journals Numerical and experimental investigations of steel-concrete beams with thin-walled section

Vestnik MGSU ◽  
2019 ◽  
pp. 22-32
Author(s):  
Farit S. Zamaliev
Keyword(s):  
Experimental Data ◽  
Computer Simulation ◽  
Strain State ◽  
Concrete Beams ◽  
Concrete Structures ◽  
Stress Strain ◽  
Stress Strain State ◽  
Numerical Studies ◽  
Field Samples ◽  
Thin Walled

Introduction. Conducted is to the evaluation of the stress-strain state of the steel-concrete beams with thin-walled section. In recent times, steel-reinforced concrete structures have become widely used in civilian buildings (beams, slabs, columns). Thin-walled section have not found wide application in steel concrete structures, unlike steel structures. Presents the results of numerical studies of beams consisting of concrete, anchors and steel beams. Two investigating of the location of anchors are given. Numerical investigations are presented of steel-concrete beams with thin-walled section based on numerical studies. Testing procedure and test result are given. Results of calculations, comparison of numerical and experimental studies are presented. Materials and methods. For full-scale experiments, steel I-beams with filling of side cavities with concrete were adopted, screws are used as anchor ties, with varied both the lengths and their location (vertically and obliquely). As steel curved C-shaped steel profiles were used steel profiles from the range of the company “Steel Faces”. ANSYS software package was used for computer modeling. A total of 16 steel concrete beams were considered, for which the results of strength and stiffness evaluation were obtained in ANSYS. Results. The data of the stress-strain state of beams on the basis of computer simulation are obtained. The results are used for the production of field samples. Data of computer simulation are compared with the indicators of field experiments. Conclusions. The stress-strain state of steel-concrete structures was studied on the basis of numerical and experimental data. The proposed calculation method gives good convergence with the experimental data. Anchor connections made from self-tapping screws can be used in studies for modeling in steel-concrete beams structures and other anchor devices, ensuring the joint operation of concrete and steel profiles in structures.

scholarly journals GLOBALIZATION AND GLOBAL GOVERNANCE

2013 ◽  
pp. 16-23
Author(s):  
A. A. Gromyko
Keyword(s):  
Global Governance ◽  
Common Good ◽  
Global Market ◽  
State University ◽  
The Sustainable Development ◽  
Private Interests ◽  
The Common ◽  
Academy Of Sciences ◽  
Moscow State University ◽  
The Ideal

Anatoly Andreevich Gromyko, a professor of the Moscow State University, a corresponding member of the Russian Academy of Sciences reflects in his article on the destinies of mankind and the most complex problems facing the world community at the early 21 century under globalization and increased demand in global governance. In his analysis the author concedes that after numerous pieces of research on various aspects of these two phenomena, there are still more questions than answers. He believes that globalization might become a force serving not only private interests of big corporations but also the common good of humanity. Since interdependence is the main feature of our world we should not fall prey to the ideal images of global governance because there is no one size fit all global governance. The article elaborates the three most pressing world problems:– the need in a new way of thinking about globalization. According to the author the problems of globalization must be approached with knowledge of history and acknowledgement of social justice;– the need in morally acceptable balance among unifying potential of globalization, unchained global market and the state as the last resort of its nation;– the need to make United Nations a platform, where political and social democracy should lay ground for global governance so craved for by the mankind. The author pays special attention to the dichotomy between the force of law and the law of force as well as to the prospects for the new democratic global order accommodating the sustainable development of human civilization.

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