Author, Institution: Bengisu Yilmaz, Kaunas University of Technology
Science area, field of science: Technological Sciences, Electrical and Electronic Engineering , T001
Scientific Supervisor: Prof. Dr. Elena Jasiūnienė (Kaunas University of Technology, Technological Sciences, Electrical and Electronic Engineering, T001)
Dissertation Defense Board of Electrical and Electronic Engineering Science Field:
Prof. Dr. Arūnas Lukoševičius (Kaunas University of Technology, Technological Sciences, Electrical and Electronic Engineering, T001) – chairperson
Prof. Dr. Chiara Bisagni (Delft University of Technology, the Netherlands, Technological Sciences, Mechanical Engineering, T009)
Prof. Dr. Liudas Mažeika (Kaunas University of Technology, Technological Sciences, Electrical and Electronic Engineering, T001)
Prof. Dr. Dangirutis Navikas (Kaunas University of Technology, Technological Sciences, Electrical and Electronic Engineering, T001)
Prof. Dr. Helge Pfeiffer (University of Leuven, Belgium (KU Leuven), Technological Sciences, Measurement Engineering, T010)
The doctoral dissertation is available at the library of Kaunas University of Technology (K. Donelaičio g. 20, Kaunas).
Adhesive bonding is one of the best technologies for joining aircraft structures made of composites and metals, however, its usage is limited to secondary load carrying structures due to lack of reliability in nondestructive evaluation methods. Nondestructive evaluation of adhesive bonding in aircraft structures is a challenging task because bonding is an interfacial phenomenon which involves a very thin layer of matter, often significantly lower than the wavelengths used in nondestructive testing methods. Up to date, several nondestructive testing methods have been used to evaluate bonding quality. Mostly, the structural integrity of bonded structures is determined by ultrasonic inspection and active thermography. The rise in the usage of advance signal processing algorithms, including data fusion, allows these techniques to be more efficient to visualize the internal structure as well as defect defection.
This work aims to demonstrate the advanced development and evaluation methodologies for the novel nondestructive evaluation of bonding quality determination in adhesively bonded aircraft structures using ultrasonic, electromagnetic and thermography techniques, as well as data fusion. In order to achieve this objective, following steps are undertaken: investigation of wave propagation through adhesive joints, determination of promising NDT techniques and possible post-processing algorithms, investigation of ultrasonic and electromagnetic parameters related to bonding quality, comparison of different NDT techniques performance, data fusion and reliability analysis with PoD (probability of detection) curves.