Author, Institution: Farusil Najeeb Mullaveettil, Kaunas University of Technology
Science area, field of science: Technological Sciences, Mechanical Engineering , T009
Scientific Supervisor: Dr. Rolanas Daukševičius (Kaunas University of Technology, Technological Sciences, Mechanical Engineering, T009)
Dissertation Defence Board of Mechanical Engineering Science Field:
Assoc. Prof. Dr. Regita Bendikienė (Kaunas University of Technology, Technological Sciences, Mechanical Engineering, T009) – chairperson
Dr. Gintautas Dundulis (Kaunas University of Technology, Technological Sciences, Mechanical Engineering, T009)
Prof. Dr. Hirpa Gelgele Lemu (University of Stavanger, Norway, Technological Sciences, Mechanical Engineering, T009)
Dr. Vidas Makarevičius (Lithuanian Energy Institute, Technological Sciences, Materials Engineering, T008)
The doctoral dissertation is available at the library of Kaunas University of Technology (K. Donelaičio g. 20, Kaunas).
The dissertation defence was held remotely.
Annotation:
Additive manufacturing (AM) of lightweight structures and piezoelectric devices using high-performance thermoplastics is relevant within the context of Industry 4.0 for development of higher value-added products conforming to more specialized functional requirements of bio-medical/chemical, aerospace, automotive and other industries. In this research work effective AM process parameters were identified for consistent open-chamber 3D printing of fluoropolymers including PVDF, biocompatible PVDF-HFP copolymer and static-dissipative PVDF-HFP/graphene composite. These findings are useful for successful fused filament fabrication of various difficult-to-print polymers with higher crystallinity and hydrophobicity. The influence of different standard and bioinspired cellular infills on strength, elastic modulus and mechanical anisotropy of lightweight PVDF prints was characterized under tensile, flexural and compressive loading regimes. These results are conducive to rational design of lightweight functional parts for use in demanding operational conditions, requiring excellent chemical, UV and fire resistance, dimensional stability or biocompatibility. A concept of electrical poling-assisted and poling-free 3D printing of piezopolymeric transducers was demonstrated by fabricating flexible piezoelectric sensors and weekly piezo-active bioinspired 3D structures with periodic minimal surfaces, which could serve as electrostimulating bioscaffolds with predefined lattice structure.
