The plenary lecture with the title “Fracture behaviour of 3D printed Inconel 718 for porous structures applications” was commonly presented by Professor K. Monkova (Technical University of Kosice, Slovakia) and Dr. G. Pantazopoulos from ELKEME S.A. in the frame of International Conference on Structural Integrity and Durability (ICSID 2021), 7-10 September 2021, Dubrovnik Croatia. The lecture presented an overview of the design of cellular structures and the characterization of mechanical and fracture behaviour of 3D printed solid and cellular materials made of Inconel 718. The results showed a beneficial combination of strength and high volume reduction of the 3D cellular structures. Dr. George Pantazopoulos was also served as chairman of a session which was held on 10th September 2021.