Anita Orłowska, Ph.D.

Department of Intelligent Technologies (ZTI)
Division of Safety Engineering (PIB)
position: main specialist
telephone: (+48) 22 826 12 81 ext.: 432
room: 440
e-mail: aorlow

Doctoral thesis
2007-06-14Delaminacja wiotkich ustrojów sprężystych-modelowanie, identyfikacja, sterowanie 
supervisor -- Prof. Jan Holnicki-Szulc, Ph.D., Dr. Habil., Eng., IPPT PAN
602
 
Recent publications
1.Graczykowski C., Orłowska A., Holnicki-Szulc J., Prestressed composite structures – Modeling, manufacturing, design, COMPOSITE STRUCTURES, ISSN: 0263-8223, DOI: 10.1016/j.compstruct.2016.02.085, Vol.151, pp.172-182, 2016
Abstract:

This paper presents a preliminary research aimed at developing a comprehensive approach to modeling, manufacturing and optimal design of prestressed FRP composite structures. A simple and effective analytical model of prestressed composite is derived and further verified by two numerical models and the results of the experimental tests conducted on manufactured prestressed composite samples. The model reveals beneficial influence of prestress on strain and stress distribution in particular plies and resulting improvement of the global response of the composite. A design case-study of prestressed composite is presented and challenges related to design and application of more complicated composite prestressed structures are discussed.

Keywords:

Prestressed structures, Laminated composites, Prestressed FRP reinforced composites

Affiliations:
Graczykowski C.-IPPT PAN
Orłowska A.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
2.Orłowska A., Kołakowski P., Holnicki-Szulc J., Detecting delamination zones in composites by embedded electrical grid and thermographic methods, SMART MATERIALS AND STRUCTURES, ISSN: 0964-1726, DOI: 10.1088/0964-1726/20/10/105009, Vol.20, No.10, pp.105009-1-9, 2011
Abstract:

The proposed approach assumes that the composite structure is equipped with a specially designed electrical circuit with a 3D grid layout, composed of high resistivity elements embedded in the structure. The special layout of the electrical circuit activated by small currents provides scattered sources of thermal field in the laminate. It is assumed that the circuit elements exhibit failure which is coincident with the commencement of delamination. These breaks in the electrical circuit cause variations in the thermal field which can be observed by a long-wave thermovision camera. The paper is focused on two research aspects. First, some numerical simulations are presented to examine the potential of the idea itself. Next, a simple experiment using a composite sample with a hand-fabricated electrical grid is described. The performance of the grid for an arbitrarily selected position of defect in the investigated composite shows high potential for damage detection.

Affiliations:
Orłowska A.-IPPT PAN
Kołakowski P.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
3.Mróz A., Orłowska A., Holnicki-Szulc J., Semi-active damping of vibrations. Prestress Accumulation-Release strategy development, SHOCK AND VIBRATION, ISSN: 1070-9622, DOI: 10.3233/SAV-2010-0502, Vol.17, pp.123-136, 2010
Abstract:

New method for semi-active control of vibrating structures is introduced. So-called Prestress Accumulation-Release (PAR) strategy aims at releasing of the strain energy accumulated in the structure during its deformation process. The strain energy is converted into kinetic energy of higher modes of vibration which is suppressed with structural damping or by means of a damping device. The adaptation process essentially affects the first mode vibrations by introducing an elastic force that opposes the movement. Numerical simulations as well as experimental results prove that the strategy can be very effective in mitigating of the fundamental mode of a free – vibrating structure. In a numerical example 95% of the vibration amplitude was mitigated after two cycles. An experimental demonstrator shows 85% reduction of the amplitude in a cantilever free- vibrations. In much more complex practical problems smaller portion of total energy can be released from the system in each cycle, nevertheless the strategy could be applied to mitigate the vibrations of, for example, pipeline systems or pedestrian walkways.

Affiliations:
Mróz A.-IPPT PAN
Orłowska A.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
4.Orłowska A., Kołakowski P., Holnicki-Szulc J., Modelling and identification of delamination in double-layer beams by the virtual distortion method, COMPUTERS AND STRUCTURES, ISSN: 0045-7949, DOI: 10.1016/j.compstruc.2008.05.008, Vol.86, pp.2203-2214, 2008
Abstract:

The problem of modelling and identification of delamination in double-layer beams has been undertaken within the framework of the virtual distortion method. For delamination modelling, a concept of the contact layer has been proposed, assuming simple but effective truss connections. The laminate layers have been modelled with Bernoulli beams. Good correspondence of the delamination model with experiments has been observed despite disregarding the friction between layers. An algorithm for off-line identification of delamination, solving an inverse problem with the use of gradient optimization, has been proposed. For double cantilever beam examples, two co-existing delamination zones have been successfully detected. An idea of on-line identification of delamination has been put forward, too.

Keywords:

Delamination, Double-layer beams, Identification, Inverse problem

Affiliations:
Orłowska A.-IPPT PAN
Kołakowski P.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN

List of chapters in recent monographs
1.
362
Kołakowski P., Mróz A., Orłowska A., Pawłowski P., Sala D., Sekuła K., Świercz A., Wiącek D., Wójcicki P., Monitorowanie obciążeń i stanu technicznego konstrukcji mostowych, rozdział: System monitorowania stalowego mostu kolejowego, IPPT Reports on Fundamental Technological Research, pp.85-108, 2014
2.
364
Graczykowski C., Knor G., Kołakowski P., Mikułowski G., Orłowska A., Pawłowski P., Skłodowski M., Świercz A., Wiszowaty R., Zieliński T.G., Monitorowanie obciążeń i stanu technicznego konstrukcji mostowych, rozdział: Wybrane zagadnienia monitorowania, IPPT Reports on Fundamental Technological Research, pp.189-236, 2014
3.
195
Mróz A., Orłowska A., Holnicki-Szulc J., Smart technologies for safety engineering, rozdział: Adaptive damping of vibration by the prestress accumulation/release strategy, Wiley, Holnicki-Szulc J. (Ed.), pp.251-267, 2008
4.
201
Kołakowski P., Świercz A., Orłowska A., Kokot M., Holnicki-Szulc J., Smart technologies for safety engineering, rozdział: VDM-Based health monitoring of engineering systems, Wiley, Holnicki-Szulc J. (Ed.), pp.37-103, 2008

Conference papers
1.Graczykowski C., Orłowska A., Venkat R.S., The concept of smart prestressed composites. Numerical modelling and experimental evaluation, SMART2013, 6th ECCOMAS Thematic Conference on Smart Structures and Materials, 2013-09-03/09-06, Turyn (IT), pp.1-22, 2013
Abstract:

The paper introduces the concept of prestressing selected layers of laminated composite in order to increase its stiffness and improve its overall mechanical response. Both analytical and numerical models of prestressed composites are proposed and utilized to optimize applied prestressing forces. Further, dedicated laboratory stand and developed methodology of experimental evaluation are described. The final part of the paper briefly discusses prospective applications of prestressed composites.

Keywords:

prestressed structures, laminated composites, prestressed reinforced composites

Affiliations:
Graczykowski C.-IPPT PAN
Orłowska A.-IPPT PAN
Venkat R.S.-Fraunhofer Institute for Nondestructive Testing (DE)

Patents
Numer/data zgłoszenia patentowego
Ogłoszenie o zgłoszeniu patentowym
Twórca / twórcy
Tytuł
Kraj i Nazwa uprawnionego z patentu
Numer patentu
Ogłoszenie o udzieleniu patentu
pdf
391633
2010-06-26
BUP 01/12
2012-01-02
Orłowska A., Kołakowski P., Holnicki-Szulc J.
Sposób wykrywania pęknięć i rozwarstwień w elementach konstrukcji i układ elektryczny do wykrywania pęknięć i rozwarstwień w elementach konstrukcji
PL, Adaptronika Sp z o.o.
219986
WUP 08/15
2015-08-31
387685
2009-04-02
BUP 21/10
2010-10-11
Orłowska A., Kołakowski P., Holnicki-Szulc J.
Sposób wykrywania delaminacji struktur kompozytowych i układ do wykrywania delaminacji struktur kompozytowych
PL, Adaptronica Sp. z o.o., Contec A. Holnicki W. Szała Spółka Jawna
214723
WUP 09/13
2013-09-30