Author, institution: Mindaugas Kukis, Kaunas University of Technology
Science area, field: Technological Sciences, Mechanical Engineering
The Doctoral Dissertation is available at the library of Kaunas University of Technology (K. Donelaičio St. 20, Kaunas).
Scientific supervisor:
Prof. Dr. Habil. ANTANAS ŽILIUKAS, (Kaunas University of Technology, Technological Sciences, Mechanical Engineering – 09T).
Dissertation Defense Board of Mechanical Engineering Science Field:
Prof. Dr. Habil. Vytautas OSTAŠEVIČIUS (Kaunas University of Technology, Technological Sciences, Mechanical Engineering – 09T) – chairman;
Prof. Dr. Habil. Algimantas BUBULIS (Kaunas University of Technology, Technological Sciences, Mechanical Engineering – 09T);
Dr. Rolanas DAUKŠEVIČIUS (Kaunas University of Technology, Technological Sciences, Mechanical Engineering – 09T);
Prof. Dr. Vytautas GRIGAS (Kaunas University of Technology, Technological Sciences, Mechanical Engineering – 09T);
Prof. Dr. Vytenis JANKAUSKAS (Aleksandras Stulginskis University, Technological Sciences, Mechanical Engineering – 09T);
Prof. Dr. Habil. Rimantas KAČIANAUSKAS (Vilnius Gediminas Technical University, Technological Sciences, Mechanical Engineering – 09T).
Annotation:
In this thesis there are investigated pressure vessels, having multilayered, cylindrical wall with a cellular insert. Such vessels are useful in areas where multi-functionality is required. It is good alternative for vessels with the “jacket”, when cellular insert might be used to regulate and maintain the temperature of the medium.
From the performed scientific works, where were investigated cellular plates, was obtained, that just few of the cases, having structure of the cylindrical form, were studied. Until now performed scientific works investigated especially complex structures, convenient just for theoretical studies, because their manufacturing process is quite complicated. In addition, for all structures of cellular plates inherent defect – surfaces sheets remains unattached to the core. Designed core structure offers a simple production technology, which minimizes the probability of mentioned defect.
Seeking for the most rational structure and its parameters, there were investigated 10 different core structures. The research consists of two parts: strength analysis, under internal pressure and stability analysis, under external pressure. There are used three strength criteria to in order to evaluate the strength.
Research results revealed that even after thickness optimization of the walls, cellular pressure vessels are not more efficient than monolithic ones mass-wise, but such vessels are dozens of times stiffer than monolithic. Choosing to manufacture such cellular vessels, it is reduced nomenclature of the materials, elements of the cylindrical structure of the vessel are thin-walled and cellular insert may be used to regulate vessel’s medium temperature.
