Przeglądaj {{ collection }} wg Autor "Kowal-Michalska, Katarzyna"

Teraz wyświetlane 1 - 11 z 11

Global and local instability of thin-walled columns beyond the proportional limit
(Wydawnictwo Politechniki Łódzkiej, 1997) Kołakowski, Zbigniew; Kowal-Michalska, Katarzyna
The problem of global and local stability in the inelastic range for thin-walled columns is examined on the basis of the defonnation theory and the incremental theory of plasticity. Columns of closed and open cross-sections built from rectangular isotropic plates are subjected to the loading changing from unifonn compression to pure bending. A solution of elastic buckling for a thin-walled orthotropic columns based on Koiter's asymptotic method is employed to investigate the elasto-plastic buckling mode of the colunm and to detennine the critical load. The study is based on the numerical method of the transition matrix. The results of numerical calculations are presented in diagrams
Influence of foam filling on dynamic response of hemispherical shell subjected to blast pressure
(Politechnika Łódzka. Katedra Wytrzymałości Materiałów i Konstrukcji., 2012) Świniarski, Jacek; Kowal-Michalska, Katarzyna; Niezgodziński, Tadeusz
Introduction to engineering
(Wydawnictwo Politechniki Łódzkiej, 2008) Grądzki, Ryszard; Kowal-Michalska, Katarzyna; Matuszek, Józef
Lately, the technology development takes place at a great rate, which requires from each of us a continuous observation of this process. In order to understand the latest achievements of technology, it is necessary to know the basic concepts, phenomena and technological processes. We know also that in the majority of businesses beside the issues concerning the economic sciences like organization or management, the problems of technology are very important. This book has been prepared, first of all, for students of the first years of managerial specializations. The program of study at the Faculty of Management and Organization, at the Technical University of Lodz, effectively combines the issues of organization and management with the technical disciplines and practices. Specific subjects allow students to understand the technological aspects of selected industries, as well as the production management, organization, marketing management and the problems of management in the information society. Many times, the students who start the studies in the fields of Management or Management and Production Engineering, are graduates of economic high schools without the basic knowledge concerning physics and other technical issues. This book is the selection of a few issues concerning the area of technology, associated with the activities of teaching and research of Division of Fundamental Technical Research and Industrial Ecology of the Faculty of Management and Organization at the Technical University of Lodz. The very wide range of problems related to the technique, forced authors to choose only the most important concepts, definitions and problems. It is difficult to discuss, even in general, all the major issues concerning the introduction to the technology. This book is also a support material and a base for studying other subjects, including the specialization' technical subjects. This book can be used by students of other departments of technical universities, by students of postgraduate studies and by managers in industry. In time of globalization and international students exchange, the English language is very often used in science and technology, so it requires a basic knowledge of vocabulary.
Inuence of Foam Filling on Dynamic Response of Hemispherical Shell Subjected to Blast Pressure.
(Lodz University of Technology. Faculty of Mechanical Engineering. Department Division of Dynamics., 2013) Świniarski, Jacek; Kowal-Michalska, Katarzyna; Niezgodziński, Tadeusz
The paper aims to investigate the effect of aluminium foam filling of hemispherical steel shell on its dynamic response, accounting for the blast pressure modelling. The considered structures subjected to uniformly distributed pressure, rigidly connected with a steel plate, are considered. True material stress–strain curves for shell and foam filling are assumed in calculations. The problem is solved by FEM using ANSYS software. The time relations of strain energy and effective stresses for different simulations of blast pressure are determined and compared for steel shells and shells filled with aluminum foam.
A new approach to dynamic buckling load estimation for plate structures
(Politechnika Łódzka. Katedra Wytrzymałości Materiałów i Konstrukcji, 2012) Kowal-Michalska, Katarzyna; Kubiak, Tomasz
Stability and load carrying capacity of multi-cell thin-walled columns of rectangular cross-sections
(Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2009) Królak, Marian; Kowal-Michalska, Katarzyna; Mania, Radosław J.; Świniarski, Jacek
The paper concerns theoretical, numerical and experimental analysis of the stability and ultimate load of multi-cell thin-walled columns of rectangular and square cross-sections subjected to axial compression (uniform shortening of the column). The theoretical analysis deals with the local and global stability of multi-cell orthotropic columns of a rectangular profile with rectangular cells. It has been shown that for a multi-cell column made of the same material and having the same cross-section area, the value of local buckling stress of the column walls grows rapidly with an increase of the cell number. The experiment conducted for isotropic columns has also proved a significant growth of the ultimate load with the increase of the cell number. The paper gives some conclusions which can be useful in design of thin-walled box columns.
Static and dynamic buckling of functionality graded plates subjected to thermomechanical loading
(Politechnika Łódzka. Katedra Wytrzymałości Materiałów i Konstrukcji., 2012) Kowal-Michalska, Katarzyna; Mania, Radosław J.
Static and Dynamic Thermomechanical Buckling Loads of Functionally Graded Plates.
(Lodz University of Technology. Faculty of Mechanical Engineering. Department Division of Dynamics., 2013) Kowal-Michalska, Katarzyna; Mania, Radosław J.
In the paper the buckling phenomenon for static and dynamic loading (pulse of finite duration) of FGM plates subjected to simultaneous action of one directional compression and thermal field is presented. Thin, rectangular plates simply supported along all edges are considered. The investigations are conducted for different values of volume fraction exponent and uniform temperature rise in conjunction with mechanical dynamic pulse loading of finite duration.
Static Buckling of FML Columns in Elastic-Plastic Range.
(Lodz University of Technology. Faculty of Mechanical Engineering. Department Division of Dynamics., 2016) Kołakowski, Zbigniew; Kowal-Michalska, Katarzyna
The paper deals with the elasto-plastic buckling of thin-walled Fiber Metal Laminates short columns/profiles subjected to axial uniform compression. Structures of open and hollow (closed) cross-sections are considered build of at plate walls. Multilayered FML walls are considered as built of alternating layers of aluminum and fiber-glass composite. Three elastic-plastic theories are employed for constitutive relations description of aluminum layers i.e. fully elastic material behavior, the J2-deformation theory of plasticity and the J2 flow theory later both with Ramberg-Osgood formula application, whereas composite layers are assumed elastic within whole loading range. Some exemplary results determined with the application of own analytical-numerical method based on the Koiter's theory, in the Byskov and Hutchinson formulation are enclosed in the form of tables and plots.
Statics, dynamics and stability of structures. Vol. 2, Statics, dynamics and stability of structural elements and systems
(Wydawnictwo Politechniki Łódzkiej, 2012) Kołakowski, Zbigniew; Kowal-Michalska, Katarzyna; Niezgoda, Tadeusz; Trombski, Marek
X Sympozjum Stateczności Konstrukcji, Zakopane, 8-12 września 2003
(Katedra Wytrzymałości Materiałów i Konstrukcji, Politechnika Łódzka, 2003) Kowal-Michalska, Katarzyna; Kołakowski, Zbigniew