Dissertations on problems of the strength of materials and the stability of structural elements, which were defended at the Institute of Strength Problems of the Academy of Sciences of the Ukrainian SSR in 1975

1976 ◽  
Vol 8 (10) ◽  
pp. 1248-1254
Author(s):  
R. I. Kuriat ◽  
R. R. Kocherovets
Keyword(s):  
Structural Elements ◽  
Strength Of Materials ◽  
The Stability ◽  
Academy Of Sciences

scholarly journals Stability charts based on the finite element method for underground cavities in soft carbonate rocks: validation through case-study applications

2019 ◽  
Vol 19 (10) ◽  
pp. 2079-2095 ◽  
Author(s):  
Michele Perrotti ◽  
Piernicola Lollino ◽  
Nunzio Luciano Fazio ◽  
Mario Parise
Keyword(s):  
Finite Element ◽  
Safety Margin ◽  
Structural Elements ◽  
The Finite Element Method ◽  
Geometrical Features ◽  
Overall Stability ◽  
Underground Cavities ◽  
The Stability ◽  
Rock Mechanical Properties

Abstract. The stability of man-made underground cavities in soft rocks interacting with overlying structures and infrastructures represents a challenging problem to be faced. Based upon the results of a large number of parametric two-dimensional (2-D) finite-element analyses of ideal cases of underground cavities, accounting for the variability both cave geometrical features and rock mechanical properties, specific charts have been recently proposed in the literature to assess at a preliminary stage the stability of the cavities. The purpose of the present paper is to validate the efficacy of the stability charts through the application to several case studies of underground cavities, considering both quarries collapsed in the past and quarries still stable. The stability graphs proposed by Perrotti et al. (2018) can be useful to evaluate, in a preliminary way, a safety margin for cavities that have not reached failure and to detect indications of predisposition to local or general instability phenomena. Alternatively, for sinkholes that already occurred, the graphs may be useful in identifying the conditions that led to the collapse, highlighting the importance of some structural elements (as pillars and internal walls) on the overall stability of the quarry system.

PUBLISHING PAINS, OR DESIGNING A SCIENTIFIC JOURNAL

2020 ◽  
pp. 32-58
Author(s):  
А.І. Radchenko ◽  
◽  
О.V. Vakarenko ◽  
Т.М. Shenderovych ◽  
◽  
...  
Keyword(s):  
Scientific Journal ◽  
Publishing House ◽  
Title Page ◽  
Scientific Article ◽  
Structural Elements ◽  
National Academy Of Sciences ◽  
Basic Principles ◽  
Regulatory Documents ◽  
Professional Journals ◽  
Academy Of Sciences

The article considers the basic principles of creating a unified template for a scientific journal in accordance with current regulations and rules for creating original layouts, as well as taking into account the experience of specialists of the Publishing House "Akademperiodyka" of the National Academy of Sciences of Ukraine. The list of the basic regulatory documents is given, other useful links are given. The example of a typical unified template shows what the cover and title page of a scientific journal should look like, as well as the imposition page of an article of a scientific professional publication, describes in detail the necessary structural elements of a scientific article and describes their design. The choice of the solutions presented in the unified template is briefly substantiated. The most common mistakes present in domestic scientific professional journals are described. Examples from real magazines illustrate the possible variety of design within a unified template.

ON STATIC STABILITY OF NONLINEARLY ELASTIC EULER'S COLUMNS OBEYING THE MODIFIED LUDWICK'S LAW

2012 ◽  
Vol 12 (06) ◽  
pp. 1250077 ◽  
Author(s):  
MIHA BROJAN ◽  
MATEJ SITAR ◽  
FRANC KOSEL
Keyword(s):  
Constitutive Model ◽  
Static Stability ◽  
Engineering Practice ◽  
Structural Systems ◽  
Structural Elements ◽  
Material Parameters ◽  
Bifurcation Buckling ◽  
Elastic Column ◽  
The Stability ◽  
Nonlinearly Elastic

It is illustrated in this paper that a nonlinearly elastic column, depending upon the values of different material parameters involved, exhibits several stability characteristics and types of buckling which are generally observed separately in distinctively different structural systems. By introducing finite disturbances it is shown that the column may buckle well before the bifurcation buckling load is reached. The proposed approach can be useful in engineering practice since it can be utilized to study the stability of uniaxial structural elements made from rubber or any other material which obeys the modified Ludwick's constitutive model.

scholarly journals BIM FROM LASER SCANS… NOT JUST FOR BUILDINGS: NURBS-BASED PARAMETRIC MODELING OF A MEDIEVAL BRIDGE

2016 ◽  
Vol III-5 ◽  
pp. 51-56 ◽  
Author(s):  
L. Barazzetti ◽  
F. Banfi ◽  
R. Brumana ◽  
M. Previtali ◽  
F. Roncoroni
Keyword(s):  
Point Clouds ◽  
Parametric Modeling ◽  
Structural Elements ◽  
Building Information Modelling ◽  
Communications Networks ◽  
Civil Infrastructures ◽  
Irregular Shapes ◽  
Building Information ◽  
Water And Wastewater ◽  
The Stability

Building Information Modelling is not limited to buildings. BIM technology includes civil infrastructures such as roads, dams, bridges, communications networks, water and wastewater networks and tunnels. This paper describes a novel methodology for the generation of a detailed BIM of a complex medieval bridge. The use of laser scans and images coupled with the development of algorithms able to handle irregular shapes allowed the creation of advanced parametric objects, which were assembled to obtain an accurate BIM. The lack of existing object libraries required the development of specific families for the different structural elements of the bridge. Finally, some applications aimed at assessing the stability and safety of the bridge are illustrated and discussed. The BIM of the bridge can incorporate this information towards a new “BIMonitoring” concept to preserve the geometric complexity provided by point clouds, obtaining a detailed BIM with object relationships and attributes.

scholarly journals Assessment of the impact on the railway track of a special purpose passenger car model 61-934

2021 ◽  
Vol 264 ◽  
pp. 02050
Author(s):  
Bobur Jumabekov ◽  
Yodgor Ro’zmetov ◽  
Shoxrux Sultonov
Keyword(s):  
Railway Track ◽  
Theoretical Studies ◽  
Structural Elements ◽  
Regulatory Requirements ◽  
Lateral Shear ◽  
Passenger Car ◽  
Main Area ◽  
Car Model ◽  
The Stability ◽  
The Impact

In this work, theoretical studies have been carried out in order to assess the strength of structural elements of the track superstructure from the impact of a special-purpose passenger carriage. The assessment of the impact of the wagon on the railway track was carried out according to the stresses in the edges of the rail base, stresses in the main area of the subgrade and the stability of the track against lateral shear. The calculations showed that the strength and stability of the structural elements of the track superstructure as a result of the impact on it of a special-purpose passenger carriage model 61-934 meets the regulatory requirements.

Calculation of debarking drum in the Matlab environment.

2016 ◽  
Author(s):  
Л.Д. Бухтояров ◽  
И.В. Григорьев ◽  
О.А. Куницкая ◽  
А.Е. Лукин ◽  
Д.Е. Куницкая
Keyword(s):  
Physical And Mechanical Properties ◽  
Wood Chips ◽  
Raw Material ◽  
Structural Elements ◽  
Wood Processing ◽  
Processing Times ◽  
Basic Parameters ◽  
The Stability ◽  
Probabilistic Nature

Из древесины производится около 20 тысяч наименований продукции, причем около 95% приходится на продукцию химической и механо-химической переработки древесины. Большая часть таких производств в качестве сырья потребляет технологическую щепу, к которой предъявляются требования по наличию в ней коры, гнилей и минеральных включений. Наиболее трудо- и энергоемкой операцией технологического процесса по производству технологической щепы является окорка балансовой древесины, которая в подавляющем большинстве случаев производится методом групповой окорки в окорочных барабанах различной конструкции. В статье представлена математическая модель процесса групповой окорки лесоматериалов в окорочных барабанах, позволяющая оценивать один из основных параметров групповой окорки лесоматериалов – время их обработки, при котором будут минимизированы потери древесины без снижения качества окорки, с учетом конструктивных элементов барабана, параметров балансов, их свойств и температуры. Учтен вероятностный характер таких показателей, как время окорки, физико-механические свойства коры и древесины, особенности распределения слоев коры по глубине, что обусловило необходимость применения математической модели, основанной на принципах ситуационного моделирования процессов перехода лесоматериала из одного состояния в другое. Методика расчета и управления основными параметрами процесса позволяет разрабатывать организационные, технологические и технические мероприятия, обеспечивающие стабильность качественных показателей групповой окорки лесоматериалов в окорочных барабанах. Также модель представлена в виде функциональной блок-схемы, основанной на графическом интерфейсе Matlab с приложением Simulink. Используя наборы блоков Simulink, отвечающих за константы, переменные, функции, и вычислительные операции, организован процесс расчета основных параметров объектно-ориентированным ме­тодом. Wood is produced about 20 thousand kinds of products, with about 95% products of the chemical and mechano-chemical processing of wood. Most of these industries as raw material consumes wood chips, which are requirements for the presence of bark, rot and mineral inclusions. Most labor and energy intensive operation of the technological process for the manufacturing of wood chips is the debarking of pulpwood, which in the vast majority of cases, produced by a group of debarking in debarking drums of various designs. The article presents a mathematical model of the process of group debarking wood in debarking drums allows one to assess one of the key parameter group of debarking wood – processing times, which will be minimized wood losses without reducing the quality of the debarking, taking into account the structural elements of the drum, the balance parameters, their properties and temperature. Account the probabilistic nature of such indicators as: debarking, physical and mechanical properties of bark and wood, the distribution of layers of crust at depth, which necessitated the use of mathematical models based on the principles of situational simulation of the transition branch from one state to another. Calculation method and basic parameters of the process allows us to develop organizational, technological and technical measures ensuring the stability of quality indicators of group debarking wood in debarking drums. Also, the model presented in the form of functional block diagrams based on the graphical user interface of Matlab with Simulink application. Using the Simulink block sets of charge constants, variables, functions, and compute the organized process of calculating the basic parameters of the object-oriented method.

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