Author, Institution: Sushant Bhalchandra Pate, Kaunas University of Technology
Science area, field of science: Technological Sciences, Mechanical Engineering, T009
Research supervisor: Prof. Dr. Gintautas Dundulis (Kaunas University of Technology, Technological Sciences, Mechanical Engineering, T009)
Dissertation Defence Board of Mechanical Engineering Science Field:
Prof. Dr. Giedrius Janušas (Kaunas University of Technology, Technological Sciences, Mechanical Engineering, T009) – chairperson
Prof. Dr. Regita Bendikienė (Kaunas University of Technology, Technological Sciences, Mechanical Engineering, T009)
Prof. Dr. Valdas Eidukynas (Kaunas University of Technology, Technological Sciences, Mechanical Engineering, T009)
Prof. Dr. Hab. Rimantas Kačianauskas (Vilnius Gediminas Technical University, Technological Sciences, Mechanical Engineering, T009)
Senior Researcher Dr. Andrejs Kovalovs (Riga Technical University, Latvia, Technological Sciences, Mechanical Engineering, T009)
Dissertation defence meeting will be at Rectorate Hall of Kaunas University of Technology (K. Donelaičio 73-402, Kaunas)
The doctoral dissertation is available at the library of Kaunas University of Technology (Gedimino 50, Kaunas) and on the internet: S. B. Pate el. dissertation.pdf
© S. B. Pate, 2026 “The text of the thesis may not be copied, distributed, published, made public, including by making it publicly available on computer networks (Internet), reproduced in any form or by any means, including, but not limited to, electronic, mechanical or other means. Pursuant to Article 25(1) of the Law on Copyright and Related Rights of the Republic of Lithuania, a person with a disability who has difficulties in reading a document of a thesis published on the Internet, and insofar as this is justified by a particular disability, shall request that the document be made available in an alternative form by e-mail to doktorantura@ktu.lt.”
Annotation: Under cyclic loading, changes occur in the material microstructure, which lead to the degradation of mechanical properties. When designing structures, it is essential to account for potential material aging under cyclic loading conditions. This is particularly important in the design of safety-critical and environmentally hazardous systems, such as those used in nuclear power engineering, aviation, transportation, medical devices, and other high-reliability applications. Therefore, understanding material behaviour under cyclic loading is crucial, and it is especially important in the case of low-cycle fatigue, where structures undergo significant plastic deformation. Consequently, substantial attention is devoted to scientific investigations of low-cycle fatigue behaviour in materials. In this study, experimental investigations and numerical modelling of the low-cycle fatigue behaviour of steel were performed. Low-cycle fatigue tests were carried out on stainless steels AISI 304L and AISI 316L. Specimen loading was controlled using both strain-controlled and force-controlled regimes. The experiments were conducted at room temperature and at an elevated temperature of 300 °C, using solid specimens, hollow specimens with flowing water at 300 °C, and notched specimens. Experimental results were used to validate the numerical modelling outcomes. In modelling the elastic–plastic behaviour of the investigated steels under low-cycle fatigue loading, both kinematic and isotropic hardening mechanisms were considered. The parameters of the kinematic hardening material model were identified based on experimental data obtained at different strain amplitudes and temperatures. Based on the experimental results, relationships between the kinematic hardening parameters, strain amplitude, and operating temperature were established. These relationships were then employed in low-cycle fatigue simulations under various loading conditions and temperatures. The deviation between numerical simulation results and experimental data did not exceed 10%. The proposed relationships can be applied to predict the low-cycle fatigue life of steel under constant-amplitude, fully reversed loading conditions.
7th of April, 2026, 10:00
Rectorate Hall of Kaunas University of Technology (K. Donelaičio 73-402, Kaunas)
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