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Pozycja Local Dynamic Buckling of C-Shape Profile Subjected to Bending(Wydawnictwo Politechniki Łódzkiej ; Katedra Dynamiki Maszyn - Wydział Mechaniczny Politechniki Łódzkiej, 2011) Urbaniak, Mariusz; Kubiak, TomaszThis paper deals with local dynamic buckling of thin-walled girder segments (short beam-columns) subjected to bending. Various shapes of pulse loading (triangle, trapezoid and rectangle) with a duration corresponding to the fundamental period of vibration were taken into account. Assumed boundary conditions correspond to a simple support, this agrees with conditions that exist in the place of the diaphragm in a long spar. The problem was solved by finite element method. In order to determine the critical load pulse amplitudes Volmir, Budiansky-Hutchinson, Ari-Gur and Simonetta criteria were employed.Pozycja Numerical Model of CAI Test for Fibre-Reinforced Polymer Plate.(Lodz University of Technology. Faculty of Mechanical Engineering. Department Division of Dynamics., 2016) Baszczyński, Piotr; Dziomdziora, Sebastian; Naze, Rafał; Kubiak, TomaszThis article presents numerical simulations of laminates subjected to Compression After Impact (CAI) testing including delamination modelling. Different model of impact damages of laminate were considered. Progressive damage analysis have been employed and different failure criteria have been applied. For each simulation failure load has been estimated as same as the position of damages at destroyed layer. Finally, obtained numerical results were compared with experimental data from referential paper.Pozycja Selected Problems of Determining Critical Loads in Sructures with Stable Post-Critical Behaviour.(Lodz University of Technology. Faculty of Mechanical Engineering. Department Division of Dynamics., 2016) Czapski, Paweł; Kubiak, TomaszThis paper presents selected cases of inapplicability of theory based methods of determining critical loads in thin – walled, composite tubes. 8th layered composite tubes with square cross-section were being subjected to static compression and in order to register experimental data two measuring equipment were employed: strain-gauges and Digital Image Correlation system ARAMIS R ⃝ . When measurement data were collected five different theory based methods were applied in order to determine critical loads. Cases where it was impossible to apply certain methods or some doubts about correctness of the results occurred were presented and analyzed. Moreover in cases where it was possible, the theory was equivalently transformed, in such a way to fit experimental data and calculate the critical loads.Pozycja Interactive buckling in thin-walled beam-columns with widthwise varying orthotropy.(Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2006) Kubiak, TomaszAn analysis of local buckling of thin-walled beam-columns, taking account global precritical bending within the first order approximation, is presented in the paper. The problem of interactive buckling of the structure is solved by means of Byskov and Hutchinson's (1977) or Koiter's (1976) approximation theory. Beam-columns made from orthotropic plates with the main directions of orthotropy parallel to the wall edges characterised by a widthwise varying orthotropy coefficient ni=Eyi/Exi are investigated. Beam-columns with open sections (i.e. channel sections), simply supported on the loaded edges, are analysed. The girders are subjected to loads which cause a uniform or linearly variable shortening of the edges.Pozycja Dynamic response of thin-walled girders subjected to combined load(Politechnika Łódzka. Katedra Wytrzymałości Materiałów i Konstrukcji, 2012) Włuka, Piotr; Urbaniak, Mariusz; Kubiak, TomaszPozycja Stability of cross-ply composite plate with piezoelectronic actuators(Politechnika Łódzka. Katedra Wytrzymałości Materiałów i Konstrukcji, 2012) Włuka, Piotr; Kubiak, TomaszPozycja Dynamic buckling of thin-walled beam-columns with channel cross-section subjected to bending(Politechnika Łódzka. Katedra Wytrzymałości Materiałów i Konstrukcji., 2012) Urbaniak, Mariusz; Kubiak, TomaszPozycja A new approach to dynamic buckling load estimation for plate structures(Politechnika Łódzka. Katedra Wytrzymałości Materiałów i Konstrukcji, 2012) Kowal-Michalska, Katarzyna; Kubiak, TomaszPozycja Buckling and post-buckling behaviour or channel-section composite columns with various sequences of plies(Politechnika Łódzka. Katedra Wytrzymałości Materiałów i Konstrukcji., 2012) Kubiak, Tomasz; Teter, A.; Dębski, HubertPozycja Modelowanie procesu hartowania.(Stowarzyszenie Inżynierów i Techników Mechaników Polskich, 2010) Czechowski, Leszek; Jankowski, Jacek; Kubiak, TomaszPrzedstawiono wyniki badań, które są następstwem wstępnych analiz i - w efekcie końcowym - mają służyć do optymalizacji procesu hartowania (doboru odpowiednich parametrów nagrzewania i chłodzenia w piecu hartowniczym - krzywa opisująca szybkość chłodzenia) w taki sposób, aby otrzymać strukturę martenzytyczną na odpowiedniej głębokości oraz jak najmniejsze odkształcenia lub odkształcenia równomierne, powodujące że zostanie zachowany kształt detalu.