Artur Marczewski, Ph.D., Eng.


Doctoral thesis
2005Optymalizacja procesów tłoczenia blach oparta na symulacji numerycznej i ścisłych metodach analizy wrażliwości 
supervisor -- Prof. Włodzimierz Sosnowski, Ph.D., Dr. Habil., Eng., IPPT PAN
582 
Recent publications
1.Bednarek T., Kowalczyk P., Marczewski A., Sosnowski W., Improvement of stability conditions and uniqueness of penalty approach in contact modelling in sheet metal forming, COMPUTER METHODS IN MATERIALS SCIENCE / INFORMATYKA W TECHNOLOGII MATERIAŁÓW, ISSN: 1641-8581, Vol.11, No.2, pp.411-417, 2011
Abstract:

The main objective of this paper is to improve stability conditions, uniqueness and convergence of the flow approach algorithm with viscoplastic and plastic material models. In this paper, the problem of convergence and uniqueness of the problem of non-linear simulation of sheet metal forming processes modeled using rigid-viscoplastic material model is considered. In the numerical simulation of the deformation process MFP2D and MFP3D Finite Element programs were used. The simplicity of the algorithm is the main advantage of these codes, the Direct Differentiation method and optimization modules can be implemented in the source code. The numerical instability caused by high values of the condition number of the main system of equations is the main disadvantage of the codes. The penalty approach contact model used in the program makes the stiffness matrix condition number worse.

Keywords:

finite element method, sheet metal forming, computational stability, flow approach

Affiliations:
Bednarek T.-IPPT PAN
Kowalczyk P.-IPPT PAN
Marczewski A.-IPPT PAN
Sosnowski W.-IPPT PAN
2.Marczewska I., Bednarek T., Marczewski A., Sosnowski W., Jakubczak H., Rojek J., Practical fatigue analysis of hydraulic cylinders and some design recommendations, INTERNATIONAL JOURNAL OF FATIGUE, ISSN: 0142-1123, Vol.28, pp.1739-1751, 2006

List of chapters in recent monographs
1.
165
Sosnowski W., Szolc T., Bednarek T., Marczewska I., Marczewski A., Knowledge acquisition for hybrid systems of risk assessment and critical machinery diagnosis, rozdział: Attempts of durability assessment of cracked rotor shafts, Silesian University of Technology (Gliwice), Moczulski W., Ciupke K. (Eds.), pp.193-204, 2008

Conference abstracts
1.Bednarek T., Marczewski A., Sosnowski W., Modelling of fluid and structure interaction in blood vessels, SolMech 2010, 37th Solid Mechanics Conference, 2010-09-06/09-10, Warszawa (PL), pp.1-2, 2010
2.Szolc T., Bednarek T., Marczewska I., Marczewski A., Sosnowski W., Fatigue analysis of the cracked rotorby means of the one and three dimensional dynamical model, IFToMM, 7th International Conference on Rotor Dynamics, 2006-09-25/09-28, Wiedeń (AT), pp.3-200-00689-7, 2006
Abstract:

In the paper the structural one-dimensional hybrid dynamical model of the entire vibrating rotor-shaft system and the three-dimensional fmite element model of its cracked shaft zone were applied for a fatigue life prediction of the machine faulty segment under coupled bending-torsional-axial vibrations. The steady-state dynamic response amplitudes, obtained by means of the one-dimensional model of the system, have been used for the three-dimensional model as an input data for determination of maximal stresses and stress intensity factors at the crack tip. These quantities together with the Wohler curves enable us an approximate determination of load limits responsible for a probable further crack propagation. By means of the proposed approach one can predict a damage probability of the faulty rotor-shaft system of arbitrary structure operating under various dynamic and quasi-static loads affecting a crack of various sizes and shaft locations. From the investigations performed for various crack axial locations on the shaft with respect to bearing supports of the single- and double-span rotor-shaft systems, it follows that a strength of the cracked zone is much more sensitive to normal stresses due to bending and axial oscillations than to tangential stresses caused by torsional vibrations.

Keywords:

hybrid dynamical mode, vibrating rotor-shaft system, fatigue analysis

Affiliations:
Szolc T.-IPPT PAN
Bednarek T.-IPPT PAN
Marczewska I.-IPPT PAN
Marczewski A.-IPPT PAN
Sosnowski W.-IPPT PAN