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Pozycja Advanced mechanical engineering : (with elements of numerical engineering analysis)(Wydawnictwo Politechniki Łódzkiej, 2006) Kotełko, Maria; Kubiak, Tomasz; Scientific Editor of the Division : Kapitaniak, Tomasz; Niezgoda, Tadeusz; Zielnica, Jerzy[...] The book is divided into three parts: the first one contains the foundations of mechanics of solids (particularly of the theory of elasticity) including the stress and strain analysis (concept of the stress and strain tensor in the rectangular co-ordinate system, as well as constitutive stress-strain relations for the general case of elastic anisotropic materials. The first part provides also a reader with a knowledge of yield criteria of not only ductile , isotropic material but also of modern orthotropic materials. The first part concludes with the energy methods in mechanics of materials. Although this part is devoted to advanced topics of mechanics of materials it contains as well some very basic problems (like the concept of equivalent stress for combined load) since they are not included into the syllabus of prerequisite subjects of Basic Mechanical Engineering I and II delivered to the students of Mechanical Engineering and Applied Computer Science (IFE), to whom the book is devoted mainly. The second part contains the theoretical foundations of the Finite Element Method, preceded with the description of the general concept of FEM and the short review of matrix algebra. Afterwards, the basic types of finite elements are discussed and their stiffness matrices are derived. The last part is devoted to selected advanced problems of mechanics of materials, including bending of thin plates, axi-symmetrical problems of the theory of elasticity and very basic introduction to the analyses of buckling of structural members. Each problem is discussed on the basis of analytical methods and simultaneously examples of numerical FE solutions are presented. In the section dealing with bending of rectangular plates the finite difference method is presented as an example of another, alternative numerical method that can be used in mechanics of materials. The third part concludes with the short chapter introducing a reader the problems of fatigue of structures. Some of the discussed topics are illustrated using exemplary problems with detailed solutions. However, the authors assume that a reader can find more of such problems in special text-books containing collections of problems of mechanics of materials to be solved.Pozycja Analysis of magnetic field effect on ferromagnetic spheres embedded in elastomer pattern.(Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2010) Boczkowska, Anna; Czechowski, Leszek; Jaroniek, Mieczysław; Niezgoda, TadeuszThe results of modelling of the magnetorheological elastomers (MREs) microstructure using Finite Elements Method (FEM) are shown. MREs are solids analogous to magnetorheological fluids consisting of carbonyl-iron particles and a soft elastomer matrix. Fabrication of MREs is performed in an external constant magnetic field. Due to the presence of this field, the ferromagnetic particles tend to arrange themselves into elongated chains according to the magnetic field lines. FEM analysis of the MREs microstructure takes into account two cases: magnetic power and elastic vectors as well as their interactions between the components of the composite. The paper describes spatial ordering of the particles based on their interactions with the magnetic field. Two phenomena were taken into account: the force of a magnetic field and the local magnetic dipoles. Both fields have been modelled for a circular conductor with electrical current.Pozycja Elastooptyka i metoda elementów skończonych w mechanice pękania : wybrane problemy(Wydawnictwo Politechniki Łódzkiej, 2007) Niezgodziński, Tadeusz; Red. nauk. Wydziału: Kapitaniak, Tomasz; Kołakowski, Zbigniew; Niezgoda, TadeuszThe book contains results of numerical calculation and their comparison with experimental tests carried out on the specimens CT. Crack propagate until damage specimen was achieved. The angle between the direction of crack propagation and the direction of the artificial crack was measured. Author during numerical investigations compare Burzynski and Huber-MisesHencky hypothesis. The Burzynski hypothesis gives very good results for brittle materials which has different properties for tensile and compression it means that relationship between limit stress for compression Re to limit stress for tension Rm is greater than 1 (for example: epoxy resign, cast iron). Influence of relation R.!Rm on angle of crack propagation was carried out. The results of investigation gives information that for relation R.!Rm greater than 1,3 the value of angle of crack propagation is constant, and its value is about 76°. The experimental investigation is solved by photoelastic method. The numerical results were obtained using finite element method package ANSYS. The problem is solved by "element birth and death" method. Results of investigations of cracking of reinforced specimens are presented.Pozycja Stan naprężenia w elastomerze zawierającym cząstki ferromagnetyczne w polu magnetycznym.(Stowarzyszenie Inżynierów i Techników Mechaników Polskich, 2010) Boczkowska, Anna; Czechowski, Leszek; Jaroniek, Mieczysław; Niezgoda, TadeuszPrzedstawiono wyniki analizy modelowania metodą elementów skończonych oraz badań metodą elastooptyki magnetoreologicznego elastomeru w obecności pola magnetycznego. Celem przeprowadzonych symulacji numerycznych i badań eksperymentalnych było uzyskanie wiedzy o wzajemnym oddziaływaniu elastomeru i kulek żelaza (wyznaczenie wartości odkształcenia i naprężenia) oraz zdobycie doświadczenia niezbędnego do modelowania takich oddziaływań na poziomie mikrostruktury w rzeczywistym elastomerze zawierającym cząstki żelaza o wymiarach mikronowych.Pozycja 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