UNIVERSITY OF MISKOLC FACULTY OF MECHANICAL ENGINEERING AND INFORMATICS MINIMUM WEIGHT AND COST DESIGN OPTIMIZATION OF HONEYCOMB SANDWICH STRUCTURES PH.D. THESES Prepared by ALAA ABDULZAHRA DELI AL-FATLAWI Engineering of Mechanics (BSc), Applied Mechanical Engineering (MSc) ISTVÁN SÁLYI DOCTORAL SCHOOL OF MECHANICAL ENGINEERING SCIENCES TOPIC FIELD OF MECHANICAL ENGINEERING SCIENCES TOPIC GROUP OF APPLIED MECHANICS Head of Doctoral School Dr. Gabriella Bognár DSc, Full Professor Scientific Supervisors Dr. Károly Jármai DSc, Full Professor & Dr. György Kovács Dr. habil, Associate Professor Miskolc 2021