Przeglądaj {{ collection }} wg Autor "Świniarski, Jacek"

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Effect of changes in the thickness of a perforated plate of the heat exchanger on its structural stability.
(Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2004) Chudzik, Agnieszka; Świniarski, Jacek
One of the most important elements of heat exchangers are perforated bottoms. These are perforated plates of significant thickness, in which heating cartridge pipes are mounted. For the designers of heat exchangers, the strength analusis of the connection between the elements, which allows for the determination of the state of stress and calculation of displacements of the perforated bottom after fixing the pipes in it, is of special importance. It results from carried out computations that the maximum reduced stresses in the perforated bottom are significantly lower than the values of admissible stresses. In this paper, computations of stresses and strains for various thicknesses of the perforated bottom have been presented. As a results of a decrease in the thickness of the perforated bottom, its deflectionincrease, and thus the heating system pipes are more exposed to strains and losses of stability.
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
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.
Rozkład naprężeń rzeczywistych na powierzchni elementów formujących wyznaczony komputerową symulacją procesu odlewania ciśnieniowego.
(Stowarzyszenie Inżynierów i Techników Mechaników Polskich, 2012) Sawicki, Jacek; Górecki, Marek; Kaczmarek, Łukasz; Świniarski, Jacek
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.
The Strength of a Cut-off Wheel Model Subjected to a Three Point Lateral Load Assessed by Different Methods
(Wydawnictwo Politechniki Łódzkiej ; Katedra Dynamiki Maszyn - Wydział Mechaniczny Politechniki Łódzkiej, 2011) Kaczmarek, Józef; Świniarski, Jacek
In the paper the results of an assessment of a cut-off wheel model subjected to threepoint loading with lateral forces in the form reduced stresses obtained by three methods: analytical, FEM and strain gauge ones have been presented. Recommendations on the applicability of the particular methods have been indicated.
The Strength of Cut-off Wheel Model Subjected to a Single Point Lateral Load Assessed by Different Methods
(Wydawnictwo Politechniki Łódzkiej ; Katedra Dynamiki Maszyn - Wydział Mechaniczny Politechniki Łódzkiej, 2011) Kaczmarek, Józef; Świniarski, Jacek
In the paper the estimation results of strength of a cut-off wheel model subjected to a single point lateral load in the form of a reduced stress obtained by three methods: analytical, FEM (finit~element method) and strain gauge method have been presented. The applicability of the particular methods has also been discussed.